Fix the changelog.

[youtubedl] / youtube_dl / extractor / youtube.py
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py

index 7c50881c4453eaff4ac69776fcc2dc94feef8d31..617be8e96b6e305988b3ae4d0c5d3790074868e4 100644 (file)
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -1,418 +1,1133 @@
  # coding: utf-8
  
  # coding: utf-8
  
-import collections
-import errno
-import io
+from __future__ import unicode_literals
+
+
  import itertools
  import json
  import os.path
  import itertools
  import json
  import os.path
+import random
  import re
  import re
-import struct
+import time
  import traceback
  import traceback
-import zlib
  
  from .common import InfoExtractor, SearchInfoExtractor
  
  from .common import InfoExtractor, SearchInfoExtractor
-from .subtitles import SubtitlesInfoExtractor
  from ..jsinterp import JSInterpreter
  from ..jsinterp import JSInterpreter
-from ..utils import (
+from ..swfinterp import SWFInterpreter
+from ..compat import (
      compat_chr,
      compat_chr,
+    compat_kwargs,
      compat_parse_qs,
      compat_parse_qs,
-    compat_urllib_parse,
-    compat_urllib_request,
+    compat_urllib_parse_unquote,
+    compat_urllib_parse_unquote_plus,
+    compat_urllib_parse_urlencode,
+    compat_urllib_parse_urlparse,
      compat_urlparse,
      compat_str,
      compat_urlparse,
      compat_str,
-
+)
+from ..utils import (
      clean_html,
      clean_html,
-    get_cachedir,
-    get_element_by_id,
-    get_element_by_attribute,
+    error_to_compat_str,
      ExtractorError,
      ExtractorError,
+    float_or_none,
+    get_element_by_attribute,
+    get_element_by_id,
      int_or_none,
      int_or_none,
-    PagedList,
+    mimetype2ext,
+    orderedSet,
+    parse_codecs,
+    parse_duration,
+    remove_quotes,
+    remove_start,
+    smuggle_url,
+    str_to_int,
+    try_get,
      unescapeHTML,
      unified_strdate,
      unescapeHTML,
      unified_strdate,
-    orderedSet,
-    write_json_file,
+    unsmuggle_url,
      uppercase_escape,
      uppercase_escape,
+    urlencode_postdata,
  )
  
  )
  
+
  class YoutubeBaseInfoExtractor(InfoExtractor):
      """Provide base functions for Youtube extractors"""
      _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  class YoutubeBaseInfoExtractor(InfoExtractor):
      """Provide base functions for Youtube extractors"""
      _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
-    _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
-    _AGE_URL = 'https://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
+    _TWOFACTOR_URL = 'https://accounts.google.com/signin/challenge'
+
+    _LOOKUP_URL = 'https://accounts.google.com/_/signin/sl/lookup'
+    _CHALLENGE_URL = 'https://accounts.google.com/_/signin/sl/challenge'
+    _TFA_URL = 'https://accounts.google.com/_/signin/challenge?hl=en&TL={0}'
+
      _NETRC_MACHINE = 'youtube'
      # If True it will raise an error if no login info is provided
      _LOGIN_REQUIRED = False
  
      _NETRC_MACHINE = 'youtube'
      # If True it will raise an error if no login info is provided
      _LOGIN_REQUIRED = False
  
+    _PLAYLIST_ID_RE = r'(?:PL|LL|EC|UU|FL|RD|UL|TL)[0-9A-Za-z-_]{10,}'
+
      def _set_language(self):
      def _set_language(self):
-        return bool(self._download_webpage(
-            self._LANG_URL, None,
-            note=u'Setting language', errnote='unable to set language',
-            fatal=False))
+        self._set_cookie(
+            '.youtube.com', 'PREF', 'f1=50000000&hl=en',
+            # YouTube sets the expire time to about two months
+            expire_time=time.time() + 2 * 30 * 24 * 3600)
+
+    def _ids_to_results(self, ids):
+        return [
+            self.url_result(vid_id, 'Youtube', video_id=vid_id)
+            for vid_id in ids]
  
      def _login(self):
  
      def _login(self):
+        """
+        Attempt to log in to YouTube.
+        True is returned if successful or skipped.
+        False is returned if login failed.
+
+        If _LOGIN_REQUIRED is set and no authentication was provided, an error is raised.
+        """
          (username, password) = self._get_login_info()
          # No authentication to be performed
          if username is None:
              if self._LOGIN_REQUIRED:
          (username, password) = self._get_login_info()
          # No authentication to be performed
          if username is None:
              if self._LOGIN_REQUIRED:
-                raise ExtractorError(u'No login info available, needed for using %s.' % self.IE_NAME, expected=True)
-            return False
+                raise ExtractorError('No login info available, needed for using %s.' % self.IE_NAME, expected=True)
+            return True
  
          login_page = self._download_webpage(
              self._LOGIN_URL, None,
  
          login_page = self._download_webpage(
              self._LOGIN_URL, None,
-            note=u'Downloading login page',
-            errnote=u'unable to fetch login page', fatal=False)
+            note='Downloading login page',
+            errnote='unable to fetch login page', fatal=False)
          if login_page is False:
              return
  
          if login_page is False:
              return
  
-        galx = self._search_regex(r'(?s)<input.+?name="GALX".+?value="(.+?)"',
-                                  login_page, u'Login GALX parameter')
-
-        # Log in
-        login_form_strs = {
-                u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
-                u'Email': username,
-                u'GALX': galx,
-                u'Passwd': password,
-                u'PersistentCookie': u'yes',
-                u'_utf8': u'霱',
-                u'bgresponse': u'js_disabled',
-                u'checkConnection': u'',
-                u'checkedDomains': u'youtube',
-                u'dnConn': u'',
-                u'pstMsg': u'0',
-                u'rmShown': u'1',
-                u'secTok': u'',
-                u'signIn': u'Sign in',
-                u'timeStmp': u'',
-                u'service': u'youtube',
-                u'uilel': u'3',
-                u'hl': u'en_US',
-        }
-        # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
-        # chokes on unicode
-        login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
-        login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
-
-        req = compat_urllib_request.Request(self._LOGIN_URL, login_data)
-        login_results = self._download_webpage(
-            req, None,
-            note=u'Logging in', errnote=u'unable to log in', fatal=False)
-        if login_results is False:
+        login_form = self._hidden_inputs(login_page)
+
+        def req(url, f_req, note, errnote):
+            data = login_form.copy()
+            data.update({
+                'pstMsg': 1,
+                'checkConnection': 'youtube',
+                'checkedDomains': 'youtube',
+                'hl': 'en',
+                'deviceinfo': '[null,null,null,[],null,"US",null,null,[],"GlifWebSignIn",null,[null,null,[]]]',
+                'f.req': json.dumps(f_req),
+                'flowName': 'GlifWebSignIn',
+                'flowEntry': 'ServiceLogin',
+            })
+            return self._download_json(
+                url, None, note=note, errnote=errnote,
+                transform_source=lambda s: re.sub(r'^[^[]*', '', s),
+                fatal=False,
+                data=urlencode_postdata(data), headers={
+                    'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8',
+                    'Google-Accounts-XSRF': 1,
+                })
+
+        def warn(message):
+            self._downloader.report_warning(message)
+
+        lookup_req = [
+            username,
+            None, [], None, 'US', None, None, 2, False, True,
+            [
+                None, None,
+                [2, 1, None, 1,
+                 'https://accounts.google.com/ServiceLogin?passive=true&continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Fnext%3D%252F%26action_handle_signin%3Dtrue%26hl%3Den%26app%3Ddesktop%26feature%3Dsign_in_button&hl=en&service=youtube&uilel=3&requestPath=%2FServiceLogin&Page=PasswordSeparationSignIn',
+                 None, [], 4],
+                1, [None, None, []], None, None, None, True
+            ],
+            username,
+        ]
+
+        lookup_results = req(
+            self._LOOKUP_URL, lookup_req,
+            'Looking up account info', 'Unable to look up account info')
+
+        if lookup_results is False:
              return False
              return False
-        if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
-            self._downloader.report_warning(u'unable to log in: bad username or password')
+
+        user_hash = try_get(lookup_results, lambda x: x[0][2], compat_str)
+        if not user_hash:
+            warn('Unable to extract user hash')
              return False
              return False
-        return True
  
  
-    def _confirm_age(self):
-        age_form = {
-            'next_url': '/',
-            'action_confirm': 'Confirm',
-        }
-        req = compat_urllib_request.Request(self._AGE_URL,
-            compat_urllib_parse.urlencode(age_form).encode('ascii'))
+        challenge_req = [
+            user_hash,
+            None, 1, None, [1, None, None, None, [password, None, True]],
+            [
+                None, None, [2, 1, None, 1, 'https://accounts.google.com/ServiceLogin?passive=true&continue=https%3A%2F%2Fwww.youtube.com%2Fsignin%3Fnext%3D%252F%26action_handle_signin%3Dtrue%26hl%3Den%26app%3Ddesktop%26feature%3Dsign_in_button&hl=en&service=youtube&uilel=3&requestPath=%2FServiceLogin&Page=PasswordSeparationSignIn', None, [], 4],
+                1, [None, None, []], None, None, None, True
+            ]]
+
+        challenge_results = req(
+            self._CHALLENGE_URL, challenge_req,
+            'Logging in', 'Unable to log in')
+
+        if challenge_results is False:
+            return
+
+        login_res = try_get(challenge_results, lambda x: x[0][5], list)
+        if login_res:
+            login_msg = try_get(login_res, lambda x: x[5], compat_str)
+            warn(
+                'Unable to login: %s' % 'Invalid password'
+                if login_msg == 'INCORRECT_ANSWER_ENTERED' else login_msg)
+            return False
+
+        res = try_get(challenge_results, lambda x: x[0][-1], list)
+        if not res:
+            warn('Unable to extract result entry')
+            return False
+
+        tfa = try_get(res, lambda x: x[0][0], list)
+        if tfa:
+            tfa_str = try_get(tfa, lambda x: x[2], compat_str)
+            if tfa_str == 'TWO_STEP_VERIFICATION':
+                # SEND_SUCCESS - TFA code has been successfully sent to phone
+                # QUOTA_EXCEEDED - reached the limit of TFA codes
+                status = try_get(tfa, lambda x: x[5], compat_str)
+                if status == 'QUOTA_EXCEEDED':
+                    warn('Exceeded the limit of TFA codes, try later')
+                    return False
+
+                tl = try_get(challenge_results, lambda x: x[1][2], compat_str)
+                if not tl:
+                    warn('Unable to extract TL')
+                    return False
+
+                tfa_code = self._get_tfa_info('2-step verification code')
+
+                if not tfa_code:
+                    warn(
+                        'Two-factor authentication required. Provide it either interactively or with --twofactor <code>'
+                        '(Note that only TOTP (Google Authenticator App) codes work at this time.)')
+                    return False
+
+                tfa_code = remove_start(tfa_code, 'G-')
+
+                tfa_req = [
+                    user_hash, None, 2, None,
+                    [
+                        9, None, None, None, None, None, None, None,
+                        [None, tfa_code, True, 2]
+                    ]]
+
+                tfa_results = req(
+                    self._TFA_URL.format(tl), tfa_req,
+                    'Submitting TFA code', 'Unable to submit TFA code')
+
+                if tfa_results is False:
+                    return False
+
+                tfa_res = try_get(tfa_results, lambda x: x[0][5], list)
+                if tfa_res:
+                    tfa_msg = try_get(tfa_res, lambda x: x[5], compat_str)
+                    warn(
+                        'Unable to finish TFA: %s' % 'Invalid TFA code'
+                        if tfa_msg == 'INCORRECT_ANSWER_ENTERED' else tfa_msg)
+                    return False
+
+                check_cookie_url = try_get(
+                    tfa_results, lambda x: x[0][-1][2], compat_str)
+        else:
+            check_cookie_url = try_get(res, lambda x: x[2], compat_str)
+
+        if not check_cookie_url:
+            warn('Unable to extract CheckCookie URL')
+            return False
+
+        check_cookie_results = self._download_webpage(
+            check_cookie_url, None, 'Checking cookie', fatal=False)
+
+        if check_cookie_results is False:
+            return False
+
+        if 'https://myaccount.google.com/' not in check_cookie_results:
+            warn('Unable to log in')
+            return False
  
  
-        self._download_webpage(
-            req, None,
-            note=u'Confirming age', errnote=u'Unable to confirm age')
          return True
  
          return True
  
+    def _download_webpage(self, *args, **kwargs):
+        kwargs.setdefault('query', {})['disable_polymer'] = 'true'
+        return super(YoutubeBaseInfoExtractor, self)._download_webpage(
+            *args, **compat_kwargs(kwargs))
+
      def _real_initialize(self):
          if self._downloader is None:
              return
      def _real_initialize(self):
          if self._downloader is None:
              return
-        if not self._set_language():
-            return
+        self._set_language()
          if not self._login():
              return
          if not self._login():
              return
-        self._confirm_age()
  
  
  
  
-class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
-    IE_DESC = u'YouTube.com'
+class YoutubeEntryListBaseInfoExtractor(YoutubeBaseInfoExtractor):
+    # Extract entries from page with "Load more" button
+    def _entries(self, page, playlist_id):
+        more_widget_html = content_html = page
+        for page_num in itertools.count(1):
+            for entry in self._process_page(content_html):
+                yield entry
+
+            mobj = re.search(r'data-uix-load-more-href="/?(?P<more>[^"]+)"', more_widget_html)
+            if not mobj:
+                break
+
+            more = self._download_json(
+                'https://youtube.com/%s' % mobj.group('more'), playlist_id,
+                'Downloading page #%s' % page_num,
+                transform_source=uppercase_escape)
+            content_html = more['content_html']
+            if not content_html.strip():
+                # Some webpages show a "Load more" button but they don't
+                # have more videos
+                break
+            more_widget_html = more['load_more_widget_html']
+
+
+class YoutubePlaylistBaseInfoExtractor(YoutubeEntryListBaseInfoExtractor):
+    def _process_page(self, content):
+        for video_id, video_title in self.extract_videos_from_page(content):
+            yield self.url_result(video_id, 'Youtube', video_id, video_title)
+
+    def extract_videos_from_page(self, page):
+        ids_in_page = []
+        titles_in_page = []
+        for mobj in re.finditer(self._VIDEO_RE, page):
+            # The link with index 0 is not the first video of the playlist (not sure if still actual)
+            if 'index' in mobj.groupdict() and mobj.group('id') == '0':
+                continue
+            video_id = mobj.group('id')
+            video_title = unescapeHTML(mobj.group('title'))
+            if video_title:
+                video_title = video_title.strip()
+            try:
+                idx = ids_in_page.index(video_id)
+                if video_title and not titles_in_page[idx]:
+                    titles_in_page[idx] = video_title
+            except ValueError:
+                ids_in_page.append(video_id)
+                titles_in_page.append(video_title)
+        return zip(ids_in_page, titles_in_page)
+
+
+class YoutubePlaylistsBaseInfoExtractor(YoutubeEntryListBaseInfoExtractor):
+    def _process_page(self, content):
+        for playlist_id in orderedSet(re.findall(
+                r'<h3[^>]+class="[^"]*yt-lockup-title[^"]*"[^>]*><a[^>]+href="/?playlist\?list=([0-9A-Za-z-_]{10,})"',
+                content)):
+            yield self.url_result(
+                'https://www.youtube.com/playlist?list=%s' % playlist_id, 'YoutubePlaylist')
+
+    def _real_extract(self, url):
+        playlist_id = self._match_id(url)
+        webpage = self._download_webpage(url, playlist_id)
+        title = self._og_search_title(webpage, fatal=False)
+        return self.playlist_result(self._entries(webpage, playlist_id), playlist_id, title)
+
+
+class YoutubeIE(YoutubeBaseInfoExtractor):
+    IE_DESC = 'YouTube.com'
      _VALID_URL = r"""(?x)^
                       (
      _VALID_URL = r"""(?x)^
                       (
-                         (?:https?://|//)?                                    # http(s):// or protocol-independent URL (optional)
+                         (?:https?://|//)                                    # http(s):// or protocol-independent URL
                           (?:(?:(?:(?:\w+\.)?[yY][oO][uU][tT][uU][bB][eE](?:-nocookie)?\.com/|
                              (?:www\.)?deturl\.com/www\.youtube\.com/|
                              (?:www\.)?pwnyoutube\.com/|
                           (?:(?:(?:(?:\w+\.)?[yY][oO][uU][tT][uU][bB][eE](?:-nocookie)?\.com/|
                              (?:www\.)?deturl\.com/www\.youtube\.com/|
                              (?:www\.)?pwnyoutube\.com/|
+                            (?:www\.)?hooktube\.com/|
                              (?:www\.)?yourepeat\.com/|
                              tube\.majestyc\.net/|
                              youtube\.googleapis\.com/)                        # the various hostnames, with wildcard subdomains
                           (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
                           (?:                                                  # the various things that can precede the ID:
                              (?:www\.)?yourepeat\.com/|
                              tube\.majestyc\.net/|
                              youtube\.googleapis\.com/)                        # the various hostnames, with wildcard subdomains
                           (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
                           (?:                                                  # the various things that can precede the ID:
-                             (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
+                             (?:(?:v|embed|e)/(?!videoseries))                # v/ or embed/ or e/
                               |(?:                                             # or the v= param in all its forms
                                   (?:(?:watch|movie)(?:_popup)?(?:\.php)?/?)?  # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
                                   (?:\?|\#!?)                                  # the params delimiter ? or # or #!
                               |(?:                                             # or the v= param in all its forms
                                   (?:(?:watch|movie)(?:_popup)?(?:\.php)?/?)?  # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
                                   (?:\?|\#!?)                                  # the params delimiter ? or # or #!
-                                 (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
+                                 (?:.*?[&;])??                                # any other preceding param (like /?s=tuff&v=xxxx or ?s=tuff&amp;v=V36LpHqtcDY)
                                   v=
                               )
                           ))
                                   v=
                               )
                           ))
-                         |youtu\.be/                                          # just youtu.be/xxxx
-                         |https?://(?:www\.)?cleanvideosearch\.com/media/action/yt/watch\?videoId=
+                         |(?:
+                            youtu\.be|                                        # just youtu.be/xxxx
+                            vid\.plus|                                        # or vid.plus/xxxx
+                            zwearz\.com/watch|                                # or zwearz.com/watch/xxxx
+                         )/
+                         |(?:www\.)?cleanvideosearch\.com/media/action/yt/watch\?videoId=
                           )
                       )?                                                       # all until now is optional -> you can pass the naked ID
                       ([0-9A-Za-z_-]{11})                                      # here is it! the YouTube video ID
                           )
                       )?                                                       # all until now is optional -> you can pass the naked ID
                       ([0-9A-Za-z_-]{11})                                      # here is it! the YouTube video ID
+                     (?!.*?\blist=
+                        (?:
+                            %(playlist_id)s|                                  # combined list/video URLs are handled by the playlist IE
+                            WL                                                # WL are handled by the watch later IE
+                        )
+                     )
                       (?(1).+)?                                                # if we found the ID, everything can follow
                       (?(1).+)?                                                # if we found the ID, everything can follow
-                     $"""
+                     $""" % {'playlist_id': YoutubeBaseInfoExtractor._PLAYLIST_ID_RE}
      _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
      _formats = {
      _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
      _formats = {
-        '5': {'ext': 'flv', 'width': 400, 'height': 240},
-        '6': {'ext': 'flv', 'width': 450, 'height': 270},
-        '13': {'ext': '3gp'},
-        '17': {'ext': '3gp', 'width': 176, 'height': 144},
-        '18': {'ext': 'mp4', 'width': 640, 'height': 360},
-        '22': {'ext': 'mp4', 'width': 1280, 'height': 720},
-        '34': {'ext': 'flv', 'width': 640, 'height': 360},
-        '35': {'ext': 'flv', 'width': 854, 'height': 480},
-        '36': {'ext': '3gp', 'width': 320, 'height': 240},
-        '37': {'ext': 'mp4', 'width': 1920, 'height': 1080},
-        '38': {'ext': 'mp4', 'width': 4096, 'height': 3072},
-        '43': {'ext': 'webm', 'width': 640, 'height': 360},
-        '44': {'ext': 'webm', 'width': 854, 'height': 480},
-        '45': {'ext': 'webm', 'width': 1280, 'height': 720},
-        '46': {'ext': 'webm', 'width': 1920, 'height': 1080},
-
-
-        # 3d videos
-        '82': {'ext': 'mp4', 'height': 360, 'format_note': '3D', 'preference': -20},
-        '83': {'ext': 'mp4', 'height': 480, 'format_note': '3D', 'preference': -20},
-        '84': {'ext': 'mp4', 'height': 720, 'format_note': '3D', 'preference': -20},
-        '85': {'ext': 'mp4', 'height': 1080, 'format_note': '3D', 'preference': -20},
-        '100': {'ext': 'webm', 'height': 360, 'format_note': '3D', 'preference': -20},
-        '101': {'ext': 'webm', 'height': 480, 'format_note': '3D', 'preference': -20},
-        '102': {'ext': 'webm', 'height': 720, 'format_note': '3D', 'preference': -20},
+        '5': {'ext': 'flv', 'width': 400, 'height': 240, 'acodec': 'mp3', 'abr': 64, 'vcodec': 'h263'},
+        '6': {'ext': 'flv', 'width': 450, 'height': 270, 'acodec': 'mp3', 'abr': 64, 'vcodec': 'h263'},
+        '13': {'ext': '3gp', 'acodec': 'aac', 'vcodec': 'mp4v'},
+        '17': {'ext': '3gp', 'width': 176, 'height': 144, 'acodec': 'aac', 'abr': 24, 'vcodec': 'mp4v'},
+        '18': {'ext': 'mp4', 'width': 640, 'height': 360, 'acodec': 'aac', 'abr': 96, 'vcodec': 'h264'},
+        '22': {'ext': 'mp4', 'width': 1280, 'height': 720, 'acodec': 'aac', 'abr': 192, 'vcodec': 'h264'},
+        '34': {'ext': 'flv', 'width': 640, 'height': 360, 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264'},
+        '35': {'ext': 'flv', 'width': 854, 'height': 480, 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264'},
+        # itag 36 videos are either 320x180 (BaW_jenozKc) or 320x240 (__2ABJjxzNo), abr varies as well
+        '36': {'ext': '3gp', 'width': 320, 'acodec': 'aac', 'vcodec': 'mp4v'},
+        '37': {'ext': 'mp4', 'width': 1920, 'height': 1080, 'acodec': 'aac', 'abr': 192, 'vcodec': 'h264'},
+        '38': {'ext': 'mp4', 'width': 4096, 'height': 3072, 'acodec': 'aac', 'abr': 192, 'vcodec': 'h264'},
+        '43': {'ext': 'webm', 'width': 640, 'height': 360, 'acodec': 'vorbis', 'abr': 128, 'vcodec': 'vp8'},
+        '44': {'ext': 'webm', 'width': 854, 'height': 480, 'acodec': 'vorbis', 'abr': 128, 'vcodec': 'vp8'},
+        '45': {'ext': 'webm', 'width': 1280, 'height': 720, 'acodec': 'vorbis', 'abr': 192, 'vcodec': 'vp8'},
+        '46': {'ext': 'webm', 'width': 1920, 'height': 1080, 'acodec': 'vorbis', 'abr': 192, 'vcodec': 'vp8'},
+        '59': {'ext': 'mp4', 'width': 854, 'height': 480, 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264'},
+        '78': {'ext': 'mp4', 'width': 854, 'height': 480, 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264'},
+
+
+        # 3D videos
+        '82': {'ext': 'mp4', 'height': 360, 'format_note': '3D', 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264', 'preference': -20},
+        '83': {'ext': 'mp4', 'height': 480, 'format_note': '3D', 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264', 'preference': -20},
+        '84': {'ext': 'mp4', 'height': 720, 'format_note': '3D', 'acodec': 'aac', 'abr': 192, 'vcodec': 'h264', 'preference': -20},
+        '85': {'ext': 'mp4', 'height': 1080, 'format_note': '3D', 'acodec': 'aac', 'abr': 192, 'vcodec': 'h264', 'preference': -20},
+        '100': {'ext': 'webm', 'height': 360, 'format_note': '3D', 'acodec': 'vorbis', 'abr': 128, 'vcodec': 'vp8', 'preference': -20},
+        '101': {'ext': 'webm', 'height': 480, 'format_note': '3D', 'acodec': 'vorbis', 'abr': 192, 'vcodec': 'vp8', 'preference': -20},
+        '102': {'ext': 'webm', 'height': 720, 'format_note': '3D', 'acodec': 'vorbis', 'abr': 192, 'vcodec': 'vp8', 'preference': -20},
  
          # Apple HTTP Live Streaming
  
          # Apple HTTP Live Streaming
-        '92': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'preference': -10},
-        '93': {'ext': 'mp4', 'height': 360, 'format_note': 'HLS', 'preference': -10},
-        '94': {'ext': 'mp4', 'height': 480, 'format_note': 'HLS', 'preference': -10},
-        '95': {'ext': 'mp4', 'height': 720, 'format_note': 'HLS', 'preference': -10},
-        '96': {'ext': 'mp4', 'height': 1080, 'format_note': 'HLS', 'preference': -10},
-        '132': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'preference': -10},
-        '151': {'ext': 'mp4', 'height': 72, 'format_note': 'HLS', 'preference': -10},
+        '91': {'ext': 'mp4', 'height': 144, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 48, 'vcodec': 'h264', 'preference': -10},
+        '92': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 48, 'vcodec': 'h264', 'preference': -10},
+        '93': {'ext': 'mp4', 'height': 360, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264', 'preference': -10},
+        '94': {'ext': 'mp4', 'height': 480, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 128, 'vcodec': 'h264', 'preference': -10},
+        '95': {'ext': 'mp4', 'height': 720, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 256, 'vcodec': 'h264', 'preference': -10},
+        '96': {'ext': 'mp4', 'height': 1080, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 256, 'vcodec': 'h264', 'preference': -10},
+        '132': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 48, 'vcodec': 'h264', 'preference': -10},
+        '151': {'ext': 'mp4', 'height': 72, 'format_note': 'HLS', 'acodec': 'aac', 'abr': 24, 'vcodec': 'h264', 'preference': -10},
  
          # DASH mp4 video
  
          # DASH mp4 video
-        '133': {'ext': 'mp4', 'height': 240, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '134': {'ext': 'mp4', 'height': 360, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '135': {'ext': 'mp4', 'height': 480, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '136': {'ext': 'mp4', 'height': 720, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '137': {'ext': 'mp4', 'height': 1080, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '138': {'ext': 'mp4', 'height': 2160, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '160': {'ext': 'mp4', 'height': 144, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '264': {'ext': 'mp4', 'height': 1440, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
+        '133': {'ext': 'mp4', 'height': 240, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '134': {'ext': 'mp4', 'height': 360, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '135': {'ext': 'mp4', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '136': {'ext': 'mp4', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '137': {'ext': 'mp4', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '138': {'ext': 'mp4', 'format_note': 'DASH video', 'vcodec': 'h264'},  # Height can vary (https://github.com/rg3/youtube-dl/issues/4559)
+        '160': {'ext': 'mp4', 'height': 144, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '212': {'ext': 'mp4', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '264': {'ext': 'mp4', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'h264'},
+        '298': {'ext': 'mp4', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'h264', 'fps': 60},
+        '299': {'ext': 'mp4', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'h264', 'fps': 60},
+        '266': {'ext': 'mp4', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'h264'},
  
          # Dash mp4 audio
  
          # Dash mp4 audio
-        '139': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 48, 'preference': -50},
-        '140': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 128, 'preference': -50},
-        '141': {'ext': 'm4a', 'format_note': 'DASH audio', 'vcodec': 'none', 'abr': 256, 'preference': -50},
+        '139': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'abr': 48, 'container': 'm4a_dash'},
+        '140': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'abr': 128, 'container': 'm4a_dash'},
+        '141': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'abr': 256, 'container': 'm4a_dash'},
+        '256': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'container': 'm4a_dash'},
+        '258': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'container': 'm4a_dash'},
+        '325': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'dtse', 'container': 'm4a_dash'},
+        '328': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'ec-3', 'container': 'm4a_dash'},
  
          # Dash webm
  
          # Dash webm
-        '167': {'ext': 'webm', 'height': 360, 'width': 640, 'format_note': 'DASH video', 'acodec': 'none', 'container': 'webm', 'vcodec': 'VP8', 'preference': -40},
-        '168': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'acodec': 'none', 'container': 'webm', 'vcodec': 'VP8', 'preference': -40},
-        '169': {'ext': 'webm', 'height': 720, 'width': 1280, 'format_note': 'DASH video', 'acodec': 'none', 'container': 'webm', 'vcodec': 'VP8', 'preference': -40},
-        '170': {'ext': 'webm', 'height': 1080, 'width': 1920, 'format_note': 'DASH video', 'acodec': 'none', 'container': 'webm', 'vcodec': 'VP8', 'preference': -40},
-        '218': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'acodec': 'none', 'container': 'webm', 'vcodec': 'VP8', 'preference': -40},
-        '219': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'acodec': 'none', 'container': 'webm', 'vcodec': 'VP8', 'preference': -40},
-        '242': {'ext': 'webm', 'height': 240, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '243': {'ext': 'webm', 'height': 360, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '244': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '245': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '246': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '247': {'ext': 'webm', 'height': 720, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '248': {'ext': 'webm', 'height': 1080, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
-        '271': {'ext': 'webm', 'height': 1440, 'format_note': 'DASH video', 'acodec': 'none', 'preference': -40},
+        '167': {'ext': 'webm', 'height': 360, 'width': 640, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+        '168': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+        '169': {'ext': 'webm', 'height': 720, 'width': 1280, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+        '170': {'ext': 'webm', 'height': 1080, 'width': 1920, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+        '218': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+        '219': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+        '278': {'ext': 'webm', 'height': 144, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp9'},
+        '242': {'ext': 'webm', 'height': 240, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '243': {'ext': 'webm', 'height': 360, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '244': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '245': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '246': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '247': {'ext': 'webm', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '248': {'ext': 'webm', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '271': {'ext': 'webm', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        # itag 272 videos are either 3840x2160 (e.g. RtoitU2A-3E) or 7680x4320 (sLprVF6d7Ug)
+        '272': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '302': {'ext': 'webm', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
+        '303': {'ext': 'webm', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
+        '308': {'ext': 'webm', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
+        '313': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+        '315': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
  
          # Dash webm audio
  
          # Dash webm audio
-        '171': {'ext': 'webm', 'vcodec': 'none', 'format_note': 'DASH audio', 'abr': 48, 'preference': -50},
-        '172': {'ext': 'webm', 'vcodec': 'none', 'format_note': 'DASH audio', 'abr': 256, 'preference': -50},
+        '171': {'ext': 'webm', 'acodec': 'vorbis', 'format_note': 'DASH audio', 'abr': 128},
+        '172': {'ext': 'webm', 'acodec': 'vorbis', 'format_note': 'DASH audio', 'abr': 256},
+
+        # Dash webm audio with opus inside
+        '249': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'abr': 50},
+        '250': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'abr': 70},
+        '251': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'abr': 160},
  
          # RTMP (unnamed)
          '_rtmp': {'protocol': 'rtmp'},
      }
  
          # RTMP (unnamed)
          '_rtmp': {'protocol': 'rtmp'},
      }
+    _SUBTITLE_FORMATS = ('ttml', 'vtt')
+
+    _GEO_BYPASS = False
  
  
-    IE_NAME = u'youtube'
+    IE_NAME = 'youtube'
      _TESTS = [
          {
      _TESTS = [
          {
-            u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
-            u"file":  u"BaW_jenozKc.mp4",
-            u"info_dict": {
-                u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
-                u"uploader": u"Philipp Hagemeister",
-                u"uploader_id": u"phihag",
-                u"upload_date": u"20121002",
-                u"description": u"test chars:  \"'/\\ä↭𝕐\ntest URL: https://github.com/rg3/youtube-dl/issues/1892\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de .",
-                u"categories": [u'Science & Technology'],
+            'url': 'https://www.youtube.com/watch?v=BaW_jenozKc&t=1s&end=9',
+            'info_dict': {
+                'id': 'BaW_jenozKc',
+                'ext': 'mp4',
+                'title': 'youtube-dl test video "\'/\\ä↭𝕐',
+                'uploader': 'Philipp Hagemeister',
+                'uploader_id': 'phihag',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/phihag',
+                'upload_date': '20121002',
+                'license': 'Standard YouTube License',
+                'description': 'test chars:  "\'/\\ä↭𝕐\ntest URL: https://github.com/rg3/youtube-dl/issues/1892\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de .',
+                'categories': ['Science & Technology'],
+                'tags': ['youtube-dl'],
+                'duration': 10,
+                'like_count': int,
+                'dislike_count': int,
+                'start_time': 1,
+                'end_time': 9,
              }
          },
          {
              }
          },
          {
-            u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
-            u"file":  u"UxxajLWwzqY.mp4",
-            u"note": u"Test generic use_cipher_signature video (#897)",
-            u"info_dict": {
-                u"upload_date": u"20120506",
-                u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
-                u"description": u"md5:fea86fda2d5a5784273df5c7cc994d9f",
-                u"uploader": u"Icona Pop",
-                u"uploader_id": u"IconaPop"
+            'url': 'https://www.youtube.com/watch?v=UxxajLWwzqY',
+            'note': 'Test generic use_cipher_signature video (#897)',
+            'info_dict': {
+                'id': 'UxxajLWwzqY',
+                'ext': 'mp4',
+                'upload_date': '20120506',
+                'title': 'Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]',
+                'alt_title': 'I Love It (feat. Charli XCX)',
+                'description': 'md5:f3ceb5ef83a08d95b9d146f973157cc8',
+                'tags': ['Icona Pop i love it', 'sweden', 'pop music', 'big beat records', 'big beat', 'charli',
+                         'xcx', 'charli xcx', 'girls', 'hbo', 'i love it', "i don't care", 'icona', 'pop',
+                         'iconic ep', 'iconic', 'love', 'it'],
+                'duration': 180,
+                'uploader': 'Icona Pop',
+                'uploader_id': 'IconaPop',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/IconaPop',
+                'license': 'Standard YouTube License',
+                'creator': 'Icona Pop',
              }
          },
          {
              }
          },
          {
-            u"url":  u"https://www.youtube.com/watch?v=07FYdnEawAQ",
-            u"file":  u"07FYdnEawAQ.mp4",
-            u"note": u"Test VEVO video with age protection (#956)",
-            u"info_dict": {
-                u"upload_date": u"20130703",
-                u"title": u"Justin Timberlake - Tunnel Vision (Explicit)",
-                u"description": u"md5:64249768eec3bc4276236606ea996373",
-                u"uploader": u"justintimberlakeVEVO",
-                u"uploader_id": u"justintimberlakeVEVO"
+            'url': 'https://www.youtube.com/watch?v=07FYdnEawAQ',
+            'note': 'Test VEVO video with age protection (#956)',
+            'info_dict': {
+                'id': '07FYdnEawAQ',
+                'ext': 'mp4',
+                'upload_date': '20130703',
+                'title': 'Justin Timberlake - Tunnel Vision (Explicit)',
+                'alt_title': 'Tunnel Vision',
+                'description': 'md5:64249768eec3bc4276236606ea996373',
+                'duration': 419,
+                'uploader': 'justintimberlakeVEVO',
+                'uploader_id': 'justintimberlakeVEVO',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/justintimberlakeVEVO',
+                'license': 'Standard YouTube License',
+                'creator': 'Justin Timberlake',
+                'age_limit': 18,
              }
          },
          {
              }
          },
          {
-            u"url":  u"//www.YouTube.com/watch?v=yZIXLfi8CZQ",
-            u"file":  u"yZIXLfi8CZQ.mp4",
-            u"note": u"Embed-only video (#1746)",
-            u"info_dict": {
-                u"upload_date": u"20120608",
-                u"title": u"Principal Sexually Assaults A Teacher - Episode 117 - 8th June 2012",
-                u"description": u"md5:09b78bd971f1e3e289601dfba15ca4f7",
-                u"uploader": u"SET India",
-                u"uploader_id": u"setindia"
+            'url': '//www.YouTube.com/watch?v=yZIXLfi8CZQ',
+            'note': 'Embed-only video (#1746)',
+            'info_dict': {
+                'id': 'yZIXLfi8CZQ',
+                'ext': 'mp4',
+                'upload_date': '20120608',
+                'title': 'Principal Sexually Assaults A Teacher - Episode 117 - 8th June 2012',
+                'description': 'md5:09b78bd971f1e3e289601dfba15ca4f7',
+                'uploader': 'SET India',
+                'uploader_id': 'setindia',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/setindia',
+                'license': 'Standard YouTube License',
+                'age_limit': 18,
              }
          },
          {
              }
          },
          {
-            u"url": u"http://www.youtube.com/watch?v=a9LDPn-MO4I",
-            u"file": u"a9LDPn-MO4I.m4a",
-            u"note": u"256k DASH audio (format 141) via DASH manifest",
-            u"info_dict": {
-                u"upload_date": "20121002",
-                u"uploader_id": "8KVIDEO",
-                u"description": "No description available.",
-                u"uploader": "8KVIDEO",
-                u"title": "UHDTV TEST 8K VIDEO.mp4"
+            'url': 'https://www.youtube.com/watch?v=BaW_jenozKc&v=UxxajLWwzqY',
+            'note': 'Use the first video ID in the URL',
+            'info_dict': {
+                'id': 'BaW_jenozKc',
+                'ext': 'mp4',
+                'title': 'youtube-dl test video "\'/\\ä↭𝕐',
+                'uploader': 'Philipp Hagemeister',
+                'uploader_id': 'phihag',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/phihag',
+                'upload_date': '20121002',
+                'license': 'Standard YouTube License',
+                'description': 'test chars:  "\'/\\ä↭𝕐\ntest URL: https://github.com/rg3/youtube-dl/issues/1892\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de .',
+                'categories': ['Science & Technology'],
+                'tags': ['youtube-dl'],
+                'duration': 10,
+                'like_count': int,
+                'dislike_count': int,
              },
              },
-            u"params": {
-                u"youtube_include_dash_manifest": True,
-                u"format": "141",
+            'params': {
+                'skip_download': True,
              },
          },
              },
          },
+        {
+            'url': 'https://www.youtube.com/watch?v=a9LDPn-MO4I',
+            'note': '256k DASH audio (format 141) via DASH manifest',
+            'info_dict': {
+                'id': 'a9LDPn-MO4I',
+                'ext': 'm4a',
+                'upload_date': '20121002',
+                'uploader_id': '8KVIDEO',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/8KVIDEO',
+                'description': '',
+                'uploader': '8KVIDEO',
+                'license': 'Standard YouTube License',
+                'title': 'UHDTV TEST 8K VIDEO.mp4'
+            },
+            'params': {
+                'youtube_include_dash_manifest': True,
+                'format': '141',
+            },
+            'skip': 'format 141 not served anymore',
+        },
          # DASH manifest with encrypted signature
          {
          # DASH manifest with encrypted signature
          {
-            u'url': u'https://www.youtube.com/watch?v=IB3lcPjvWLA',
-            u'info_dict': {
-                u'id': u'IB3lcPjvWLA',
-                u'ext': u'm4a',
-                u'title': u'Afrojack - The Spark ft. Spree Wilson',
-                u'description': u'md5:9717375db5a9a3992be4668bbf3bc0a8',
-                u'uploader': u'AfrojackVEVO',
-                u'uploader_id': u'AfrojackVEVO',
-                u'upload_date': u'20131011',
+            'url': 'https://www.youtube.com/watch?v=IB3lcPjvWLA',
+            'info_dict': {
+                'id': 'IB3lcPjvWLA',
+                'ext': 'm4a',
+                'title': 'Afrojack, Spree Wilson - The Spark ft. Spree Wilson',
+                'description': 'md5:12e7067fa6735a77bdcbb58cb1187d2d',
+                'duration': 244,
+                'uploader': 'AfrojackVEVO',
+                'uploader_id': 'AfrojackVEVO',
+                'upload_date': '20131011',
+                'license': 'Standard YouTube License',
+            },
+            'params': {
+                'youtube_include_dash_manifest': True,
+                'format': '141/bestaudio[ext=m4a]',
+            },
+        },
+        # JS player signature function name containing $
+        {
+            'url': 'https://www.youtube.com/watch?v=nfWlot6h_JM',
+            'info_dict': {
+                'id': 'nfWlot6h_JM',
+                'ext': 'm4a',
+                'title': 'Taylor Swift - Shake It Off',
+                'alt_title': 'Shake It Off',
+                'description': 'md5:95f66187cd7c8b2c13eb78e1223b63c3',
+                'duration': 242,
+                'uploader': 'TaylorSwiftVEVO',
+                'uploader_id': 'TaylorSwiftVEVO',
+                'upload_date': '20140818',
+                'license': 'Standard YouTube License',
+                'creator': 'Taylor Swift',
              },
              },
-            u"params": {
-                u'youtube_include_dash_manifest': True,
-                u'format': '141',
+            'params': {
+                'youtube_include_dash_manifest': True,
+                'format': '141/bestaudio[ext=m4a]',
              },
          },
              },
          },
+        # Controversy video
+        {
+            'url': 'https://www.youtube.com/watch?v=T4XJQO3qol8',
+            'info_dict': {
+                'id': 'T4XJQO3qol8',
+                'ext': 'mp4',
+                'duration': 219,
+                'upload_date': '20100909',
+                'uploader': 'The Amazing Atheist',
+                'uploader_id': 'TheAmazingAtheist',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/TheAmazingAtheist',
+                'license': 'Standard YouTube License',
+                'title': 'Burning Everyone\'s Koran',
+                'description': 'SUBSCRIBE: http://www.youtube.com/saturninefilms\n\nEven Obama has taken a stand against freedom on this issue: http://www.huffingtonpost.com/2010/09/09/obama-gma-interview-quran_n_710282.html',
+            }
+        },
+        # Normal age-gate video (No vevo, embed allowed)
+        {
+            'url': 'https://youtube.com/watch?v=HtVdAasjOgU',
+            'info_dict': {
+                'id': 'HtVdAasjOgU',
+                'ext': 'mp4',
+                'title': 'The Witcher 3: Wild Hunt - The Sword Of Destiny Trailer',
+                'description': r're:(?s).{100,}About the Game\n.*?The Witcher 3: Wild Hunt.{100,}',
+                'duration': 142,
+                'uploader': 'The Witcher',
+                'uploader_id': 'WitcherGame',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/WitcherGame',
+                'upload_date': '20140605',
+                'license': 'Standard YouTube License',
+                'age_limit': 18,
+            },
+        },
+        # Age-gate video with encrypted signature
+        {
+            'url': 'https://www.youtube.com/watch?v=6kLq3WMV1nU',
+            'info_dict': {
+                'id': '6kLq3WMV1nU',
+                'ext': 'mp4',
+                'title': 'Dedication To My Ex (Miss That) (Lyric Video)',
+                'description': 'md5:33765bb339e1b47e7e72b5490139bb41',
+                'duration': 247,
+                'uploader': 'LloydVEVO',
+                'uploader_id': 'LloydVEVO',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/LloydVEVO',
+                'upload_date': '20110629',
+                'license': 'Standard YouTube License',
+                'age_limit': 18,
+            },
+        },
+        # video_info is None (https://github.com/rg3/youtube-dl/issues/4421)
+        # YouTube Red ad is not captured for creator
+        {
+            'url': '__2ABJjxzNo',
+            'info_dict': {
+                'id': '__2ABJjxzNo',
+                'ext': 'mp4',
+                'duration': 266,
+                'upload_date': '20100430',
+                'uploader_id': 'deadmau5',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/deadmau5',
+                'creator': 'deadmau5',
+                'description': 'md5:12c56784b8032162bb936a5f76d55360',
+                'uploader': 'deadmau5',
+                'license': 'Standard YouTube License',
+                'title': 'Deadmau5 - Some Chords (HD)',
+                'alt_title': 'Some Chords',
+            },
+            'expected_warnings': [
+                'DASH manifest missing',
+            ]
+        },
+        # Olympics (https://github.com/rg3/youtube-dl/issues/4431)
+        {
+            'url': 'lqQg6PlCWgI',
+            'info_dict': {
+                'id': 'lqQg6PlCWgI',
+                'ext': 'mp4',
+                'duration': 6085,
+                'upload_date': '20150827',
+                'uploader_id': 'olympic',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/olympic',
+                'license': 'Standard YouTube License',
+                'description': 'HO09  - Women -  GER-AUS - Hockey - 31 July 2012 - London 2012 Olympic Games',
+                'uploader': 'Olympic',
+                'title': 'Hockey - Women -  GER-AUS - London 2012 Olympic Games',
+            },
+            'params': {
+                'skip_download': 'requires avconv',
+            }
+        },
+        # Non-square pixels
+        {
+            'url': 'https://www.youtube.com/watch?v=_b-2C3KPAM0',
+            'info_dict': {
+                'id': '_b-2C3KPAM0',
+                'ext': 'mp4',
+                'stretched_ratio': 16 / 9.,
+                'duration': 85,
+                'upload_date': '20110310',
+                'uploader_id': 'AllenMeow',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/AllenMeow',
+                'description': 'made by Wacom from Korea | 字幕&加油添醋 by TY\'s Allen | 感謝heylisa00cavey1001同學熱情提供梗及翻譯',
+                'uploader': '孫艾倫',
+                'license': 'Standard YouTube License',
+                'title': '[A-made] 變態妍字幕版 太妍 我就是這樣的人',
+            },
+        },
+        # url_encoded_fmt_stream_map is empty string
+        {
+            'url': 'qEJwOuvDf7I',
+            'info_dict': {
+                'id': 'qEJwOuvDf7I',
+                'ext': 'webm',
+                'title': 'Обсуждение судебной практики по выборам 14 сентября 2014 года в Санкт-Петербурге',
+                'description': '',
+                'upload_date': '20150404',
+                'uploader_id': 'spbelect',
+                'uploader': 'Наблюдатели Петербурга',
+            },
+            'params': {
+                'skip_download': 'requires avconv',
+            },
+            'skip': 'This live event has ended.',
+        },
+        # Extraction from multiple DASH manifests (https://github.com/rg3/youtube-dl/pull/6097)
+        {
+            'url': 'https://www.youtube.com/watch?v=FIl7x6_3R5Y',
+            'info_dict': {
+                'id': 'FIl7x6_3R5Y',
+                'ext': 'mp4',
+                'title': 'md5:7b81415841e02ecd4313668cde88737a',
+                'description': 'md5:116377fd2963b81ec4ce64b542173306',
+                'duration': 220,
+                'upload_date': '20150625',
+                'uploader_id': 'dorappi2000',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/dorappi2000',
+                'uploader': 'dorappi2000',
+                'license': 'Standard YouTube License',
+                'formats': 'mincount:32',
+            },
+        },
+        # DASH manifest with segment_list
+        {
+            'url': 'https://www.youtube.com/embed/CsmdDsKjzN8',
+            'md5': '8ce563a1d667b599d21064e982ab9e31',
+            'info_dict': {
+                'id': 'CsmdDsKjzN8',
+                'ext': 'mp4',
+                'upload_date': '20150501',  # According to '<meta itemprop="datePublished"', but in other places it's 20150510
+                'uploader': 'Airtek',
+                'description': 'Retransmisión en directo de la XVIII media maratón de Zaragoza.',
+                'uploader_id': 'UCzTzUmjXxxacNnL8I3m4LnQ',
+                'license': 'Standard YouTube License',
+                'title': 'Retransmisión XVIII Media maratón Zaragoza 2015',
+            },
+            'params': {
+                'youtube_include_dash_manifest': True,
+                'format': '135',  # bestvideo
+            },
+            'skip': 'This live event has ended.',
+        },
+        {
+            # Multifeed videos (multiple cameras), URL is for Main Camera
+            'url': 'https://www.youtube.com/watch?v=jqWvoWXjCVs',
+            'info_dict': {
+                'id': 'jqWvoWXjCVs',
+                'title': 'teamPGP: Rocket League Noob Stream',
+                'description': 'md5:dc7872fb300e143831327f1bae3af010',
+            },
+            'playlist': [{
+                'info_dict': {
+                    'id': 'jqWvoWXjCVs',
+                    'ext': 'mp4',
+                    'title': 'teamPGP: Rocket League Noob Stream (Main Camera)',
+                    'description': 'md5:dc7872fb300e143831327f1bae3af010',
+                    'duration': 7335,
+                    'upload_date': '20150721',
+                    'uploader': 'Beer Games Beer',
+                    'uploader_id': 'beergamesbeer',
+                    'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/beergamesbeer',
+                    'license': 'Standard YouTube License',
+                },
+            }, {
+                'info_dict': {
+                    'id': '6h8e8xoXJzg',
+                    'ext': 'mp4',
+                    'title': 'teamPGP: Rocket League Noob Stream (kreestuh)',
+                    'description': 'md5:dc7872fb300e143831327f1bae3af010',
+                    'duration': 7337,
+                    'upload_date': '20150721',
+                    'uploader': 'Beer Games Beer',
+                    'uploader_id': 'beergamesbeer',
+                    'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/beergamesbeer',
+                    'license': 'Standard YouTube License',
+                },
+            }, {
+                'info_dict': {
+                    'id': 'PUOgX5z9xZw',
+                    'ext': 'mp4',
+                    'title': 'teamPGP: Rocket League Noob Stream (grizzle)',
+                    'description': 'md5:dc7872fb300e143831327f1bae3af010',
+                    'duration': 7337,
+                    'upload_date': '20150721',
+                    'uploader': 'Beer Games Beer',
+                    'uploader_id': 'beergamesbeer',
+                    'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/beergamesbeer',
+                    'license': 'Standard YouTube License',
+                },
+            }, {
+                'info_dict': {
+                    'id': 'teuwxikvS5k',
+                    'ext': 'mp4',
+                    'title': 'teamPGP: Rocket League Noob Stream (zim)',
+                    'description': 'md5:dc7872fb300e143831327f1bae3af010',
+                    'duration': 7334,
+                    'upload_date': '20150721',
+                    'uploader': 'Beer Games Beer',
+                    'uploader_id': 'beergamesbeer',
+                    'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/beergamesbeer',
+                    'license': 'Standard YouTube License',
+                },
+            }],
+            'params': {
+                'skip_download': True,
+            },
+        },
+        {
+            # Multifeed video with comma in title (see https://github.com/rg3/youtube-dl/issues/8536)
+            'url': 'https://www.youtube.com/watch?v=gVfLd0zydlo',
+            'info_dict': {
+                'id': 'gVfLd0zydlo',
+                'title': 'DevConf.cz 2016 Day 2 Workshops 1 14:00 - 15:30',
+            },
+            'playlist_count': 2,
+            'skip': 'Not multifeed anymore',
+        },
+        {
+            'url': 'https://vid.plus/FlRa-iH7PGw',
+            'only_matching': True,
+        },
+        {
+            'url': 'https://zwearz.com/watch/9lWxNJF-ufM/electra-woman-dyna-girl-official-trailer-grace-helbig.html',
+            'only_matching': True,
+        },
+        {
+            # Title with JS-like syntax "};" (see https://github.com/rg3/youtube-dl/issues/7468)
+            # Also tests cut-off URL expansion in video description (see
+            # https://github.com/rg3/youtube-dl/issues/1892,
+            # https://github.com/rg3/youtube-dl/issues/8164)
+            'url': 'https://www.youtube.com/watch?v=lsguqyKfVQg',
+            'info_dict': {
+                'id': 'lsguqyKfVQg',
+                'ext': 'mp4',
+                'title': '{dark walk}; Loki/AC/Dishonored; collab w/Elflover21',
+                'alt_title': 'Dark Walk',
+                'description': 'md5:8085699c11dc3f597ce0410b0dcbb34a',
+                'duration': 133,
+                'upload_date': '20151119',
+                'uploader_id': 'IronSoulElf',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/IronSoulElf',
+                'uploader': 'IronSoulElf',
+                'license': 'Standard YouTube License',
+                'creator': 'Todd Haberman, Daniel Law Heath & Aaron Kaplan',
+            },
+            'params': {
+                'skip_download': True,
+            },
+        },
+        {
+            # Tags with '};' (see https://github.com/rg3/youtube-dl/issues/7468)
+            'url': 'https://www.youtube.com/watch?v=Ms7iBXnlUO8',
+            'only_matching': True,
+        },
+        {
+            # Video with yt:stretch=17:0
+            'url': 'https://www.youtube.com/watch?v=Q39EVAstoRM',
+            'info_dict': {
+                'id': 'Q39EVAstoRM',
+                'ext': 'mp4',
+                'title': 'Clash Of Clans#14 Dicas De Ataque Para CV 4',
+                'description': 'md5:ee18a25c350637c8faff806845bddee9',
+                'upload_date': '20151107',
+                'uploader_id': 'UCCr7TALkRbo3EtFzETQF1LA',
+                'uploader': 'CH GAMER DROID',
+            },
+            'params': {
+                'skip_download': True,
+            },
+            'skip': 'This video does not exist.',
+        },
+        {
+            # Video licensed under Creative Commons
+            'url': 'https://www.youtube.com/watch?v=M4gD1WSo5mA',
+            'info_dict': {
+                'id': 'M4gD1WSo5mA',
+                'ext': 'mp4',
+                'title': 'md5:e41008789470fc2533a3252216f1c1d1',
+                'description': 'md5:a677553cf0840649b731a3024aeff4cc',
+                'duration': 721,
+                'upload_date': '20150127',
+                'uploader_id': 'BerkmanCenter',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/BerkmanCenter',
+                'uploader': 'The Berkman Klein Center for Internet & Society',
+                'license': 'Creative Commons Attribution license (reuse allowed)',
+            },
+            'params': {
+                'skip_download': True,
+            },
+        },
+        {
+            # Channel-like uploader_url
+            'url': 'https://www.youtube.com/watch?v=eQcmzGIKrzg',
+            'info_dict': {
+                'id': 'eQcmzGIKrzg',
+                'ext': 'mp4',
+                'title': 'Democratic Socialism and Foreign Policy | Bernie Sanders',
+                'description': 'md5:dda0d780d5a6e120758d1711d062a867',
+                'duration': 4060,
+                'upload_date': '20151119',
+                'uploader': 'Bernie 2016',
+                'uploader_id': 'UCH1dpzjCEiGAt8CXkryhkZg',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/channel/UCH1dpzjCEiGAt8CXkryhkZg',
+                'license': 'Creative Commons Attribution license (reuse allowed)',
+            },
+            'params': {
+                'skip_download': True,
+            },
+        },
+        {
+            'url': 'https://www.youtube.com/watch?feature=player_embedded&amp;amp;v=V36LpHqtcDY',
+            'only_matching': True,
+        },
+        {
+            # YouTube Red paid video (https://github.com/rg3/youtube-dl/issues/10059)
+            'url': 'https://www.youtube.com/watch?v=i1Ko8UG-Tdo',
+            'only_matching': True,
+        },
+        {
+            # Rental video preview
+            'url': 'https://www.youtube.com/watch?v=yYr8q0y5Jfg',
+            'info_dict': {
+                'id': 'uGpuVWrhIzE',
+                'ext': 'mp4',
+                'title': 'Piku - Trailer',
+                'description': 'md5:c36bd60c3fd6f1954086c083c72092eb',
+                'upload_date': '20150811',
+                'uploader': 'FlixMatrix',
+                'uploader_id': 'FlixMatrixKaravan',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/FlixMatrixKaravan',
+                'license': 'Standard YouTube License',
+            },
+            'params': {
+                'skip_download': True,
+            },
+        },
+        {
+            # YouTube Red video with episode data
+            'url': 'https://www.youtube.com/watch?v=iqKdEhx-dD4',
+            'info_dict': {
+                'id': 'iqKdEhx-dD4',
+                'ext': 'mp4',
+                'title': 'Isolation - Mind Field (Ep 1)',
+                'description': 'md5:8013b7ddea787342608f63a13ddc9492',
+                'duration': 2085,
+                'upload_date': '20170118',
+                'uploader': 'Vsauce',
+                'uploader_id': 'Vsauce',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/Vsauce',
+                'license': 'Standard YouTube License',
+                'series': 'Mind Field',
+                'season_number': 1,
+                'episode_number': 1,
+            },
+            'params': {
+                'skip_download': True,
+            },
+            'expected_warnings': [
+                'Skipping DASH manifest',
+            ],
+        },
+        {
+            # The following content has been identified by the YouTube community
+            # as inappropriate or offensive to some audiences.
+            'url': 'https://www.youtube.com/watch?v=6SJNVb0GnPI',
+            'info_dict': {
+                'id': '6SJNVb0GnPI',
+                'ext': 'mp4',
+                'title': 'Race Differences in Intelligence',
+                'description': 'md5:5d161533167390427a1f8ee89a1fc6f1',
+                'duration': 965,
+                'upload_date': '20140124',
+                'uploader': 'New Century Foundation',
+                'uploader_id': 'UCEJYpZGqgUob0zVVEaLhvVg',
+                'uploader_url': r're:https?://(?:www\.)?youtube\.com/channel/UCEJYpZGqgUob0zVVEaLhvVg',
+                'license': 'Standard YouTube License',
+                'view_count': int,
+            },
+            'params': {
+                'skip_download': True,
+            },
+        },
+        {
+            # itag 212
+            'url': '1t24XAntNCY',
+            'only_matching': True,
+        },
+        {
+            # geo restricted to JP
+            'url': 'sJL6WA-aGkQ',
+            'only_matching': True,
+        },
+        {
+            'url': 'https://www.youtube.com/watch?v=MuAGGZNfUkU&list=RDMM',
+            'only_matching': True,
+        },
      ]
  
      ]
  
-
-    @classmethod
-    def suitable(cls, url):
-        """Receives a URL and returns True if suitable for this IE."""
-        if YoutubePlaylistIE.suitable(url): return False
-        return re.match(cls._VALID_URL, url) is not None
-
      def __init__(self, *args, **kwargs):
          super(YoutubeIE, self).__init__(*args, **kwargs)
          self._player_cache = {}
  
      def report_video_info_webpage_download(self, video_id):
          """Report attempt to download video info webpage."""
      def __init__(self, *args, **kwargs):
          super(YoutubeIE, self).__init__(*args, **kwargs)
          self._player_cache = {}
  
      def report_video_info_webpage_download(self, video_id):
          """Report attempt to download video info webpage."""
-        self.to_screen(u'%s: Downloading video info webpage' % video_id)
+        self.to_screen('%s: Downloading video info webpage' % video_id)
  
      def report_information_extraction(self, video_id):
          """Report attempt to extract video information."""
  
      def report_information_extraction(self, video_id):
          """Report attempt to extract video information."""
-        self.to_screen(u'%s: Extracting video information' % video_id)
+        self.to_screen('%s: Extracting video information' % video_id)
  
      def report_unavailable_format(self, video_id, format):
          """Report extracted video URL."""
  
      def report_unavailable_format(self, video_id, format):
          """Report extracted video URL."""
-        self.to_screen(u'%s: Format %s not available' % (video_id, format))
+        self.to_screen('%s: Format %s not available' % (video_id, format))
  
      def report_rtmp_download(self):
          """Indicate the download will use the RTMP protocol."""
  
      def report_rtmp_download(self):
          """Indicate the download will use the RTMP protocol."""
-        self.to_screen(u'RTMP download detected')
-
-    def _extract_signature_function(self, video_id, player_url, slen):
-        id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9_-]+)\.(?P<ext>[a-z]+)$',
-                        player_url)
+        self.to_screen('RTMP download detected')
+
+    def _signature_cache_id(self, example_sig):
+        """ Return a string representation of a signature """
+        return '.'.join(compat_str(len(part)) for part in example_sig.split('.'))
+
+    def _extract_signature_function(self, video_id, player_url, example_sig):
+        id_m = re.match(
+            r'.*?-(?P<id>[a-zA-Z0-9_-]+)(?:/watch_as3|/html5player(?:-new)?|(?:/[a-z]{2}_[A-Z]{2})?/base)?\.(?P<ext>[a-z]+)$',
+            player_url)
+        if not id_m:
+            raise ExtractorError('Cannot identify player %r' % player_url)
          player_type = id_m.group('ext')
          player_id = id_m.group('id')
  
          # Read from filesystem cache
          player_type = id_m.group('ext')
          player_id = id_m.group('id')
  
          # Read from filesystem cache
-        func_id = '%s_%s_%d' % (player_type, player_id, slen)
+        func_id = '%s_%s_%s' % (
+            player_type, player_id, self._signature_cache_id(example_sig))
          assert os.path.basename(func_id) == func_id
          assert os.path.basename(func_id) == func_id
-        cache_dir = get_cachedir(self._downloader.params)
  
  
-        cache_enabled = cache_dir is not None
-        if cache_enabled:
-            cache_fn = os.path.join(os.path.expanduser(cache_dir),
-                                    u'youtube-sigfuncs',
-                                    func_id + '.json')
-            try:
-                with io.open(cache_fn, 'r', encoding='utf-8') as cachef:
-                    cache_spec = json.load(cachef)
-                return lambda s: u''.join(s[i] for i in cache_spec)
-            except IOError:
-                pass  # No cache available
+        cache_spec = self._downloader.cache.load('youtube-sigfuncs', func_id)
+        if cache_spec is not None:
+            return lambda s: ''.join(s[i] for i in cache_spec)
  
  
+        download_note = (
+            'Downloading player %s' % player_url
+            if self._downloader.params.get('verbose') else
+            'Downloading %s player %s' % (player_type, player_id)
+        )
          if player_type == 'js':
              code = self._download_webpage(
                  player_url, video_id,
          if player_type == 'js':
              code = self._download_webpage(
                  player_url, video_id,
-                note=u'Downloading %s player %s' % (player_type, player_id),
-                errnote=u'Download of %s failed' % player_url)
+                note=download_note,
+                errnote='Download of %s failed' % player_url)
              res = self._parse_sig_js(code)
          elif player_type == 'swf':
              urlh = self._request_webpage(
                  player_url, video_id,
              res = self._parse_sig_js(code)
          elif player_type == 'swf':
              urlh = self._request_webpage(
                  player_url, video_id,
-                note=u'Downloading %s player %s' % (player_type, player_id),
-                errnote=u'Download of %s failed' % player_url)
+                note=download_note,
+                errnote='Download of %s failed' % player_url)
              code = urlh.read()
              res = self._parse_sig_swf(code)
          else:
              assert False, 'Invalid player type %r' % player_type
  
              code = urlh.read()
              res = self._parse_sig_swf(code)
          else:
              assert False, 'Invalid player type %r' % player_type
  
-        if cache_enabled:
-            try:
-                test_string = u''.join(map(compat_chr, range(slen)))
-                cache_res = res(test_string)
-                cache_spec = [ord(c) for c in cache_res]
-                try:
-                    os.makedirs(os.path.dirname(cache_fn))
-                except OSError as ose:
-                    if ose.errno != errno.EEXIST:
-                        raise
-                write_json_file(cache_spec, cache_fn)
-            except Exception:
-                tb = traceback.format_exc()
-                self._downloader.report_warning(
-                    u'Writing cache to %r failed: %s' % (cache_fn, tb))
+        test_string = ''.join(map(compat_chr, range(len(example_sig))))
+        cache_res = res(test_string)
+        cache_spec = [ord(c) for c in cache_res]
  
  
+        self._downloader.cache.store('youtube-sigfuncs', func_id, cache_spec)
          return res
  
          return res
  
-    def _print_sig_code(self, func, slen):
+    def _print_sig_code(self, func, example_sig):
          def gen_sig_code(idxs):
              def _genslice(start, end, step):
          def gen_sig_code(idxs):
              def _genslice(start, end, step):
-                starts = u'' if start == 0 else str(start)
-                ends = (u':%d' % (end+step)) if end + step >= 0 else u':'
-                steps = u'' if step == 1 else (u':%d' % step)
-                return u's[%s%s%s]' % (starts, ends, steps)
+                starts = '' if start == 0 else str(start)
+                ends = (':%d' % (end + step)) if end + step >= 0 else ':'
+                steps = '' if step == 1 else (':%d' % step)
+                return 's[%s%s%s]' % (starts, ends, steps)
  
              step = None
  
              step = None
-            start = '(Never used)'  # Quelch pyflakes warnings - start will be
-                                    # set as soon as step is set
+            # Quelch pyflakes warnings - start will be set when step is set
+            start = '(Never used)'
              for i, prev in zip(idxs[1:], idxs[:-1]):
                  if step is not None:
                      if i - prev == step:
              for i, prev in zip(idxs[1:], idxs[:-1]):
                  if step is not None:
                      if i - prev == step:
@@ -425,623 +1140,352 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                      start = prev
                      continue
                  else:
                      start = prev
                      continue
                  else:
-                    yield u's[%d]' % prev
+                    yield 's[%d]' % prev
              if step is None:
              if step is None:
-                yield u's[%d]' % i
+                yield 's[%d]' % i
              else:
                  yield _genslice(start, i, step)
  
              else:
                  yield _genslice(start, i, step)
  
-        test_string = u''.join(map(compat_chr, range(slen)))
+        test_string = ''.join(map(compat_chr, range(len(example_sig))))
          cache_res = func(test_string)
          cache_spec = [ord(c) for c in cache_res]
          cache_res = func(test_string)
          cache_spec = [ord(c) for c in cache_res]
-        expr_code = u' + '.join(gen_sig_code(cache_spec))
-        code = u'if len(s) == %d:\n    return %s\n' % (slen, expr_code)
-        self.to_screen(u'Extracted signature function:\n' + code)
+        expr_code = ' + '.join(gen_sig_code(cache_spec))
+        signature_id_tuple = '(%s)' % (
+            ', '.join(compat_str(len(p)) for p in example_sig.split('.')))
+        code = ('if tuple(len(p) for p in s.split(\'.\')) == %s:\n'
+                '    return %s\n') % (signature_id_tuple, expr_code)
+        self.to_screen('Extracted signature function:\n' + code)
  
      def _parse_sig_js(self, jscode):
          funcname = self._search_regex(
  
      def _parse_sig_js(self, jscode):
          funcname = self._search_regex(
-            r'signature=([a-zA-Z]+)', jscode,
-             u'Initial JS player signature function name')
+            (r'(["\'])signature\1\s*,\s*(?P<sig>[a-zA-Z0-9$]+)\(',
+             r'\.sig\|\|(?P<sig>[a-zA-Z0-9$]+)\('),
+            jscode, 'Initial JS player signature function name', group='sig')
  
          jsi = JSInterpreter(jscode)
          initial_function = jsi.extract_function(funcname)
          return lambda s: initial_function([s])
  
      def _parse_sig_swf(self, file_contents):
  
          jsi = JSInterpreter(jscode)
          initial_function = jsi.extract_function(funcname)
          return lambda s: initial_function([s])
  
      def _parse_sig_swf(self, file_contents):
-        if file_contents[1:3] != b'WS':
-            raise ExtractorError(
-                u'Not an SWF file; header is %r' % file_contents[:3])
-        if file_contents[:1] == b'C':
-            content = zlib.decompress(file_contents[8:])
-        else:
-            raise NotImplementedError(u'Unsupported compression format %r' %
-                                      file_contents[:1])
-
-        def extract_tags(content):
-            pos = 0
-            while pos < len(content):
-                header16 = struct.unpack('<H', content[pos:pos+2])[0]
-                pos += 2
-                tag_code = header16 >> 6
-                tag_len = header16 & 0x3f
-                if tag_len == 0x3f:
-                    tag_len = struct.unpack('<I', content[pos:pos+4])[0]
-                    pos += 4
-                assert pos+tag_len <= len(content)
-                yield (tag_code, content[pos:pos+tag_len])
-                pos += tag_len
-
-        code_tag = next(tag
-                        for tag_code, tag in extract_tags(content)
-                        if tag_code == 82)
-        p = code_tag.index(b'\0', 4) + 1
-        code_reader = io.BytesIO(code_tag[p:])
-
-        # Parse ABC (AVM2 ByteCode)
-        def read_int(reader=None):
-            if reader is None:
-                reader = code_reader
-            res = 0
-            shift = 0
-            for _ in range(5):
-                buf = reader.read(1)
-                assert len(buf) == 1
-                b = struct.unpack('<B', buf)[0]
-                res = res | ((b & 0x7f) << shift)
-                if b & 0x80 == 0:
-                    break
-                shift += 7
-            return res
-
-        def u30(reader=None):
-            res = read_int(reader)
-            assert res & 0xf0000000 == 0
-            return res
-        u32 = read_int
-
-        def s32(reader=None):
-            v = read_int(reader)
-            if v & 0x80000000 != 0:
-                v = - ((v ^ 0xffffffff) + 1)
-            return v
-
-        def read_string(reader=None):
-            if reader is None:
-                reader = code_reader
-            slen = u30(reader)
-            resb = reader.read(slen)
-            assert len(resb) == slen
-            return resb.decode('utf-8')
-
-        def read_bytes(count, reader=None):
-            if reader is None:
-                reader = code_reader
-            resb = reader.read(count)
-            assert len(resb) == count
-            return resb
-
-        def read_byte(reader=None):
-            resb = read_bytes(1, reader=reader)
-            res = struct.unpack('<B', resb)[0]
-            return res
-
-        # minor_version + major_version
-        read_bytes(2 + 2)
-
-        # Constant pool
-        int_count = u30()
-        for _c in range(1, int_count):
-            s32()
-        uint_count = u30()
-        for _c in range(1, uint_count):
-            u32()
-        double_count = u30()
-        read_bytes((double_count-1) * 8)
-        string_count = u30()
-        constant_strings = [u'']
-        for _c in range(1, string_count):
-            s = read_string()
-            constant_strings.append(s)
-        namespace_count = u30()
-        for _c in range(1, namespace_count):
-            read_bytes(1)  # kind
-            u30()  # name
-        ns_set_count = u30()
-        for _c in range(1, ns_set_count):
-            count = u30()
-            for _c2 in range(count):
-                u30()
-        multiname_count = u30()
-        MULTINAME_SIZES = {
-            0x07: 2,  # QName
-            0x0d: 2,  # QNameA
-            0x0f: 1,  # RTQName
-            0x10: 1,  # RTQNameA
-            0x11: 0,  # RTQNameL
-            0x12: 0,  # RTQNameLA
-            0x09: 2,  # Multiname
-            0x0e: 2,  # MultinameA
-            0x1b: 1,  # MultinameL
-            0x1c: 1,  # MultinameLA
-        }
-        multinames = [u'']
-        for _c in range(1, multiname_count):
-            kind = u30()
-            assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind
-            if kind == 0x07:
-                u30()  # namespace_idx
-                name_idx = u30()
-                multinames.append(constant_strings[name_idx])
-            else:
-                multinames.append('[MULTINAME kind: %d]' % kind)
-                for _c2 in range(MULTINAME_SIZES[kind]):
-                    u30()
-
-        # Methods
-        method_count = u30()
-        MethodInfo = collections.namedtuple(
-            'MethodInfo',
-            ['NEED_ARGUMENTS', 'NEED_REST'])
-        method_infos = []
-        for method_id in range(method_count):
-            param_count = u30()
-            u30()  # return type
-            for _ in range(param_count):
-                u30()  # param type
-            u30()  # name index (always 0 for youtube)
-            flags = read_byte()
-            if flags & 0x08 != 0:
-                # Options present
-                option_count = u30()
-                for c in range(option_count):
-                    u30()  # val
-                    read_bytes(1)  # kind
-            if flags & 0x80 != 0:
-                # Param names present
-                for _ in range(param_count):
-                    u30()  # param name
-            mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
-            method_infos.append(mi)
-
-        # Metadata
-        metadata_count = u30()
-        for _c in range(metadata_count):
-            u30()  # name
-            item_count = u30()
-            for _c2 in range(item_count):
-                u30()  # key
-                u30()  # value
-
-        def parse_traits_info():
-            trait_name_idx = u30()
-            kind_full = read_byte()
-            kind = kind_full & 0x0f
-            attrs = kind_full >> 4
-            methods = {}
-            if kind in [0x00, 0x06]:  # Slot or Const
-                u30()  # Slot id
-                u30()  # type_name_idx
-                vindex = u30()
-                if vindex != 0:
-                    read_byte()  # vkind
-            elif kind in [0x01, 0x02, 0x03]:  # Method / Getter / Setter
-                u30()  # disp_id
-                method_idx = u30()
-                methods[multinames[trait_name_idx]] = method_idx
-            elif kind == 0x04:  # Class
-                u30()  # slot_id
-                u30()  # classi
-            elif kind == 0x05:  # Function
-                u30()  # slot_id
-                function_idx = u30()
-                methods[function_idx] = multinames[trait_name_idx]
-            else:
-                raise ExtractorError(u'Unsupported trait kind %d' % kind)
-
-            if attrs & 0x4 != 0:  # Metadata present
-                metadata_count = u30()
-                for _c3 in range(metadata_count):
-                    u30()  # metadata index
-
-            return methods
-
-        # Classes
-        TARGET_CLASSNAME = u'SignatureDecipher'
-        searched_idx = multinames.index(TARGET_CLASSNAME)
-        searched_class_id = None
-        class_count = u30()
-        for class_id in range(class_count):
-            name_idx = u30()
-            if name_idx == searched_idx:
-                # We found the class we're looking for!
-                searched_class_id = class_id
-            u30()  # super_name idx
-            flags = read_byte()
-            if flags & 0x08 != 0:  # Protected namespace is present
-                u30()  # protected_ns_idx
-            intrf_count = u30()
-            for _c2 in range(intrf_count):
-                u30()
-            u30()  # iinit
-            trait_count = u30()
-            for _c2 in range(trait_count):
-                parse_traits_info()
-
-        if searched_class_id is None:
-            raise ExtractorError(u'Target class %r not found' %
-                                 TARGET_CLASSNAME)
-
-        method_names = {}
-        method_idxs = {}
-        for class_id in range(class_count):
-            u30()  # cinit
-            trait_count = u30()
-            for _c2 in range(trait_count):
-                trait_methods = parse_traits_info()
-                if class_id == searched_class_id:
-                    method_names.update(trait_methods.items())
-                    method_idxs.update(dict(
-                        (idx, name)
-                        for name, idx in trait_methods.items()))
-
-        # Scripts
-        script_count = u30()
-        for _c in range(script_count):
-            u30()  # init
-            trait_count = u30()
-            for _c2 in range(trait_count):
-                parse_traits_info()
-
-        # Method bodies
-        method_body_count = u30()
-        Method = collections.namedtuple('Method', ['code', 'local_count'])
-        methods = {}
-        for _c in range(method_body_count):
-            method_idx = u30()
-            u30()  # max_stack
-            local_count = u30()
-            u30()  # init_scope_depth
-            u30()  # max_scope_depth
-            code_length = u30()
-            code = read_bytes(code_length)
-            if method_idx in method_idxs:
-                m = Method(code, local_count)
-                methods[method_idxs[method_idx]] = m
-            exception_count = u30()
-            for _c2 in range(exception_count):
-                u30()  # from
-                u30()  # to
-                u30()  # target
-                u30()  # exc_type
-                u30()  # var_name
-            trait_count = u30()
-            for _c2 in range(trait_count):
-                parse_traits_info()
-
-        assert p + code_reader.tell() == len(code_tag)
-        assert len(methods) == len(method_idxs)
-
-        method_pyfunctions = {}
-
-        def extract_function(func_name):
-            if func_name in method_pyfunctions:
-                return method_pyfunctions[func_name]
-            if func_name not in methods:
-                raise ExtractorError(u'Cannot find function %r' % func_name)
-            m = methods[func_name]
-
-            def resfunc(args):
-                registers = ['(this)'] + list(args) + [None] * m.local_count
-                stack = []
-                coder = io.BytesIO(m.code)
-                while True:
-                    opcode = struct.unpack('!B', coder.read(1))[0]
-                    if opcode == 36:  # pushbyte
-                        v = struct.unpack('!B', coder.read(1))[0]
-                        stack.append(v)
-                    elif opcode == 44:  # pushstring
-                        idx = u30(coder)
-                        stack.append(constant_strings[idx])
-                    elif opcode == 48:  # pushscope
-                        # We don't implement the scope register, so we'll just
-                        # ignore the popped value
-                        stack.pop()
-                    elif opcode == 70:  # callproperty
-                        index = u30(coder)
-                        mname = multinames[index]
-                        arg_count = u30(coder)
-                        args = list(reversed(
-                            [stack.pop() for _ in range(arg_count)]))
-                        obj = stack.pop()
-                        if mname == u'split':
-                            assert len(args) == 1
-                            assert isinstance(args[0], compat_str)
-                            assert isinstance(obj, compat_str)
-                            if args[0] == u'':
-                                res = list(obj)
-                            else:
-                                res = obj.split(args[0])
-                            stack.append(res)
-                        elif mname == u'slice':
-                            assert len(args) == 1
-                            assert isinstance(args[0], int)
-                            assert isinstance(obj, list)
-                            res = obj[args[0]:]
-                            stack.append(res)
-                        elif mname == u'join':
-                            assert len(args) == 1
-                            assert isinstance(args[0], compat_str)
-                            assert isinstance(obj, list)
-                            res = args[0].join(obj)
-                            stack.append(res)
-                        elif mname in method_pyfunctions:
-                            stack.append(method_pyfunctions[mname](args))
-                        else:
-                            raise NotImplementedError(
-                                u'Unsupported property %r on %r'
-                                % (mname, obj))
-                    elif opcode == 72:  # returnvalue
-                        res = stack.pop()
-                        return res
-                    elif opcode == 79:  # callpropvoid
-                        index = u30(coder)
-                        mname = multinames[index]
-                        arg_count = u30(coder)
-                        args = list(reversed(
-                            [stack.pop() for _ in range(arg_count)]))
-                        obj = stack.pop()
-                        if mname == u'reverse':
-                            assert isinstance(obj, list)
-                            obj.reverse()
-                        else:
-                            raise NotImplementedError(
-                                u'Unsupported (void) property %r on %r'
-                                % (mname, obj))
-                    elif opcode == 93:  # findpropstrict
-                        index = u30(coder)
-                        mname = multinames[index]
-                        res = extract_function(mname)
-                        stack.append(res)
-                    elif opcode == 97:  # setproperty
-                        index = u30(coder)
-                        value = stack.pop()
-                        idx = stack.pop()
-                        obj = stack.pop()
-                        assert isinstance(obj, list)
-                        assert isinstance(idx, int)
-                        obj[idx] = value
-                    elif opcode == 98:  # getlocal
-                        index = u30(coder)
-                        stack.append(registers[index])
-                    elif opcode == 99:  # setlocal
-                        index = u30(coder)
-                        value = stack.pop()
-                        registers[index] = value
-                    elif opcode == 102:  # getproperty
-                        index = u30(coder)
-                        pname = multinames[index]
-                        if pname == u'length':
-                            obj = stack.pop()
-                            assert isinstance(obj, list)
-                            stack.append(len(obj))
-                        else:  # Assume attribute access
-                            idx = stack.pop()
-                            assert isinstance(idx, int)
-                            obj = stack.pop()
-                            assert isinstance(obj, list)
-                            stack.append(obj[idx])
-                    elif opcode == 128:  # coerce
-                        u30(coder)
-                    elif opcode == 133:  # coerce_s
-                        assert isinstance(stack[-1], (type(None), compat_str))
-                    elif opcode == 164:  # modulo
-                        value2 = stack.pop()
-                        value1 = stack.pop()
-                        res = value1 % value2
-                        stack.append(res)
-                    elif opcode == 208:  # getlocal_0
-                        stack.append(registers[0])
-                    elif opcode == 209:  # getlocal_1
-                        stack.append(registers[1])
-                    elif opcode == 210:  # getlocal_2
-                        stack.append(registers[2])
-                    elif opcode == 211:  # getlocal_3
-                        stack.append(registers[3])
-                    elif opcode == 214:  # setlocal_2
-                        registers[2] = stack.pop()
-                    elif opcode == 215:  # setlocal_3
-                        registers[3] = stack.pop()
-                    else:
-                        raise NotImplementedError(
-                            u'Unsupported opcode %d' % opcode)
-
-            method_pyfunctions[func_name] = resfunc
-            return resfunc
-
-        initial_function = extract_function(u'decipher')
+        swfi = SWFInterpreter(file_contents)
+        TARGET_CLASSNAME = 'SignatureDecipher'
+        searched_class = swfi.extract_class(TARGET_CLASSNAME)
+        initial_function = swfi.extract_function(searched_class, 'decipher')
          return lambda s: initial_function([s])
  
      def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
          """Turn the encrypted s field into a working signature"""
  
          return lambda s: initial_function([s])
  
      def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
          """Turn the encrypted s field into a working signature"""
  
-        if player_url is not None:
-            if player_url.startswith(u'//'):
-                player_url = u'https:' + player_url
-            try:
-                player_id = (player_url, len(s))
-                if player_id not in self._player_cache:
-                    func = self._extract_signature_function(
-                        video_id, player_url, len(s)
-                    )
-                    self._player_cache[player_id] = func
-                func = self._player_cache[player_id]
-                if self._downloader.params.get('youtube_print_sig_code'):
-                    self._print_sig_code(func, len(s))
-                return func(s)
-            except Exception:
-                tb = traceback.format_exc()
-                self._downloader.report_warning(
-                    u'Automatic signature extraction failed: ' + tb)
-
-            self._downloader.report_warning(
-                u'Warning: Falling back to static signature algorithm')
-
-        return self._static_decrypt_signature(
-            s, video_id, player_url, age_gate)
-
-    def _static_decrypt_signature(self, s, video_id, player_url, age_gate):
-        if age_gate:
-            # The videos with age protection use another player, so the
-            # algorithms can be different.
-            if len(s) == 86:
-                return s[2:63] + s[82] + s[64:82] + s[63]
-
-        if len(s) == 93:
-            return s[86:29:-1] + s[88] + s[28:5:-1]
-        elif len(s) == 92:
-            return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
-        elif len(s) == 91:
-            return s[84:27:-1] + s[86] + s[26:5:-1]
-        elif len(s) == 90:
-            return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
-        elif len(s) == 89:
-            return s[84:78:-1] + s[87] + s[77:60:-1] + s[0] + s[59:3:-1]
-        elif len(s) == 88:
-            return s[7:28] + s[87] + s[29:45] + s[55] + s[46:55] + s[2] + s[56:87] + s[28]
-        elif len(s) == 87:
-            return s[6:27] + s[4] + s[28:39] + s[27] + s[40:59] + s[2] + s[60:]
-        elif len(s) == 86:
-            return s[80:72:-1] + s[16] + s[71:39:-1] + s[72] + s[38:16:-1] + s[82] + s[15::-1]
-        elif len(s) == 85:
-            return s[3:11] + s[0] + s[12:55] + s[84] + s[56:84]
-        elif len(s) == 84:
-            return s[78:70:-1] + s[14] + s[69:37:-1] + s[70] + s[36:14:-1] + s[80] + s[:14][::-1]
-        elif len(s) == 83:
-            return s[80:63:-1] + s[0] + s[62:0:-1] + s[63]
-        elif len(s) == 82:
-            return s[80:37:-1] + s[7] + s[36:7:-1] + s[0] + s[6:0:-1] + s[37]
-        elif len(s) == 81:
-            return s[56] + s[79:56:-1] + s[41] + s[55:41:-1] + s[80] + s[40:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
-        elif len(s) == 80:
-            return s[1:19] + s[0] + s[20:68] + s[19] + s[69:80]
-        elif len(s) == 79:
-            return s[54] + s[77:54:-1] + s[39] + s[53:39:-1] + s[78] + s[38:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
+        if player_url is None:
+            raise ExtractorError('Cannot decrypt signature without player_url')
  
  
-        else:
-            raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
+        if player_url.startswith('//'):
+            player_url = 'https:' + player_url
+        elif not re.match(r'https?://', player_url):
+            player_url = compat_urlparse.urljoin(
+                'https://www.youtube.com', player_url)
+        try:
+            player_id = (player_url, self._signature_cache_id(s))
+            if player_id not in self._player_cache:
+                func = self._extract_signature_function(
+                    video_id, player_url, s
+                )
+                self._player_cache[player_id] = func
+            func = self._player_cache[player_id]
+            if self._downloader.params.get('youtube_print_sig_code'):
+                self._print_sig_code(func, s)
+            return func(s)
+        except Exception as e:
+            tb = traceback.format_exc()
+            raise ExtractorError(
+                'Signature extraction failed: ' + tb, cause=e)
  
  
-    def _get_available_subtitles(self, video_id, webpage):
+    def _get_subtitles(self, video_id, webpage):
          try:
          try:
-            sub_list = self._download_webpage(
+            subs_doc = self._download_xml(
                  'https://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id,
                  video_id, note=False)
          except ExtractorError as err:
                  'https://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id,
                  video_id, note=False)
          except ExtractorError as err:
-            self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
+            self._downloader.report_warning('unable to download video subtitles: %s' % error_to_compat_str(err))
              return {}
              return {}
-        lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
  
          sub_lang_list = {}
  
          sub_lang_list = {}
-        for l in lang_list:
-            lang = l[1]
-            params = compat_urllib_parse.urlencode({
-                'lang': lang,
-                'v': video_id,
-                'fmt': self._downloader.params.get('subtitlesformat', 'srt'),
-                'name': unescapeHTML(l[0]).encode('utf-8'),
-            })
-            url = u'https://www.youtube.com/api/timedtext?' + params
-            sub_lang_list[lang] = url
+        for track in subs_doc.findall('track'):
+            lang = track.attrib['lang_code']
+            if lang in sub_lang_list:
+                continue
+            sub_formats = []
+            for ext in self._SUBTITLE_FORMATS:
+                params = compat_urllib_parse_urlencode({
+                    'lang': lang,
+                    'v': video_id,
+                    'fmt': ext,
+                    'name': track.attrib['name'].encode('utf-8'),
+                })
+                sub_formats.append({
+                    'url': 'https://www.youtube.com/api/timedtext?' + params,
+                    'ext': ext,
+                })
+            sub_lang_list[lang] = sub_formats
          if not sub_lang_list:
          if not sub_lang_list:
-            self._downloader.report_warning(u'video doesn\'t have subtitles')
+            self._downloader.report_warning('video doesn\'t have subtitles')
              return {}
          return sub_lang_list
  
              return {}
          return sub_lang_list
  
-    def _get_available_automatic_caption(self, video_id, webpage):
+    def _get_ytplayer_config(self, video_id, webpage):
+        patterns = (
+            # User data may contain arbitrary character sequences that may affect
+            # JSON extraction with regex, e.g. when '};' is contained the second
+            # regex won't capture the whole JSON. Yet working around by trying more
+            # concrete regex first keeping in mind proper quoted string handling
+            # to be implemented in future that will replace this workaround (see
+            # https://github.com/rg3/youtube-dl/issues/7468,
+            # https://github.com/rg3/youtube-dl/pull/7599)
+            r';ytplayer\.config\s*=\s*({.+?});ytplayer',
+            r';ytplayer\.config\s*=\s*({.+?});',
+        )
+        config = self._search_regex(
+            patterns, webpage, 'ytplayer.config', default=None)
+        if config:
+            return self._parse_json(
+                uppercase_escape(config), video_id, fatal=False)
+
+    def _get_automatic_captions(self, video_id, webpage):
          """We need the webpage for getting the captions url, pass it as an
             argument to speed up the process."""
          """We need the webpage for getting the captions url, pass it as an
             argument to speed up the process."""
-        sub_format = self._downloader.params.get('subtitlesformat', 'srt')
-        self.to_screen(u'%s: Looking for automatic captions' % video_id)
-        mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
-        err_msg = u'Couldn\'t find automatic captions for %s' % video_id
-        if mobj is None:
+        self.to_screen('%s: Looking for automatic captions' % video_id)
+        player_config = self._get_ytplayer_config(video_id, webpage)
+        err_msg = 'Couldn\'t find automatic captions for %s' % video_id
+        if not player_config:
              self._downloader.report_warning(err_msg)
              return {}
              self._downloader.report_warning(err_msg)
              return {}
-        player_config = json.loads(mobj.group(1))
          try:
          try:
-            args = player_config[u'args']
-            caption_url = args[u'ttsurl']
-            timestamp = args[u'timestamp']
-            # We get the available subtitles
-            list_params = compat_urllib_parse.urlencode({
-                'type': 'list',
-                'tlangs': 1,
-                'asrs': 1,
-            })
-            list_url = caption_url + '&' + list_params
-            caption_list = self._download_xml(list_url, video_id)
-            original_lang_node = caption_list.find('track')
-            if original_lang_node is None or original_lang_node.attrib.get('kind') != 'asr' :
-                self._downloader.report_warning(u'Video doesn\'t have automatic captions')
-                return {}
-            original_lang = original_lang_node.attrib['lang_code']
-
-            sub_lang_list = {}
-            for lang_node in caption_list.findall('target'):
-                sub_lang = lang_node.attrib['lang_code']
-                params = compat_urllib_parse.urlencode({
-                    'lang': original_lang,
-                    'tlang': sub_lang,
-                    'fmt': sub_format,
-                    'ts': timestamp,
-                    'kind': 'asr',
+            args = player_config['args']
+            caption_url = args.get('ttsurl')
+            if caption_url:
+                timestamp = args['timestamp']
+                # We get the available subtitles
+                list_params = compat_urllib_parse_urlencode({
+                    'type': 'list',
+                    'tlangs': 1,
+                    'asrs': 1,
                  })
                  })
-                sub_lang_list[sub_lang] = caption_url + '&' + params
-            return sub_lang_list
+                list_url = caption_url + '&' + list_params
+                caption_list = self._download_xml(list_url, video_id)
+                original_lang_node = caption_list.find('track')
+                if original_lang_node is None:
+                    self._downloader.report_warning('Video doesn\'t have automatic captions')
+                    return {}
+                original_lang = original_lang_node.attrib['lang_code']
+                caption_kind = original_lang_node.attrib.get('kind', '')
+
+                sub_lang_list = {}
+                for lang_node in caption_list.findall('target'):
+                    sub_lang = lang_node.attrib['lang_code']
+                    sub_formats = []
+                    for ext in self._SUBTITLE_FORMATS:
+                        params = compat_urllib_parse_urlencode({
+                            'lang': original_lang,
+                            'tlang': sub_lang,
+                            'fmt': ext,
+                            'ts': timestamp,
+                            'kind': caption_kind,
+                        })
+                        sub_formats.append({
+                            'url': caption_url + '&' + params,
+                            'ext': ext,
+                        })
+                    sub_lang_list[sub_lang] = sub_formats
+                return sub_lang_list
+
+            def make_captions(sub_url, sub_langs):
+                parsed_sub_url = compat_urllib_parse_urlparse(sub_url)
+                caption_qs = compat_parse_qs(parsed_sub_url.query)
+                captions = {}
+                for sub_lang in sub_langs:
+                    sub_formats = []
+                    for ext in self._SUBTITLE_FORMATS:
+                        caption_qs.update({
+                            'tlang': [sub_lang],
+                            'fmt': [ext],
+                        })
+                        sub_url = compat_urlparse.urlunparse(parsed_sub_url._replace(
+                            query=compat_urllib_parse_urlencode(caption_qs, True)))
+                        sub_formats.append({
+                            'url': sub_url,
+                            'ext': ext,
+                        })
+                    captions[sub_lang] = sub_formats
+                return captions
+
+            # New captions format as of 22.06.2017
+            player_response = args.get('player_response')
+            if player_response and isinstance(player_response, compat_str):
+                player_response = self._parse_json(
+                    player_response, video_id, fatal=False)
+                if player_response:
+                    renderer = player_response['captions']['playerCaptionsTracklistRenderer']
+                    base_url = renderer['captionTracks'][0]['baseUrl']
+                    sub_lang_list = []
+                    for lang in renderer['translationLanguages']:
+                        lang_code = lang.get('languageCode')
+                        if lang_code:
+                            sub_lang_list.append(lang_code)
+                    return make_captions(base_url, sub_lang_list)
+
+            # Some videos don't provide ttsurl but rather caption_tracks and
+            # caption_translation_languages (e.g. 20LmZk1hakA)
+            # Does not used anymore as of 22.06.2017
+            caption_tracks = args['caption_tracks']
+            caption_translation_languages = args['caption_translation_languages']
+            caption_url = compat_parse_qs(caption_tracks.split(',')[0])['u'][0]
+            sub_lang_list = []
+            for lang in caption_translation_languages.split(','):
+                lang_qs = compat_parse_qs(compat_urllib_parse_unquote_plus(lang))
+                sub_lang = lang_qs.get('lc', [None])[0]
+                if sub_lang:
+                    sub_lang_list.append(sub_lang)
+            return make_captions(caption_url, sub_lang_list)
          # An extractor error can be raise by the download process if there are
          # no automatic captions but there are subtitles
          # An extractor error can be raise by the download process if there are
          # no automatic captions but there are subtitles
-        except (KeyError, ExtractorError):
+        except (KeyError, IndexError, ExtractorError):
              self._downloader.report_warning(err_msg)
              return {}
  
              self._downloader.report_warning(err_msg)
              return {}
  
+    def _mark_watched(self, video_id, video_info):
+        playback_url = video_info.get('videostats_playback_base_url', [None])[0]
+        if not playback_url:
+            return
+        parsed_playback_url = compat_urlparse.urlparse(playback_url)
+        qs = compat_urlparse.parse_qs(parsed_playback_url.query)
+
+        # cpn generation algorithm is reverse engineered from base.js.
+        # In fact it works even with dummy cpn.
+        CPN_ALPHABET = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_'
+        cpn = ''.join((CPN_ALPHABET[random.randint(0, 256) & 63] for _ in range(0, 16)))
+
+        qs.update({
+            'ver': ['2'],
+            'cpn': [cpn],
+        })
+        playback_url = compat_urlparse.urlunparse(
+            parsed_playback_url._replace(query=compat_urllib_parse_urlencode(qs, True)))
+
+        self._download_webpage(
+            playback_url, video_id, 'Marking watched',
+            'Unable to mark watched', fatal=False)
+
+    @staticmethod
+    def _extract_urls(webpage):
+        # Embedded YouTube player
+        entries = [
+            unescapeHTML(mobj.group('url'))
+            for mobj in re.finditer(r'''(?x)
+            (?:
+                <iframe[^>]+?src=|
+                data-video-url=|
+                <embed[^>]+?src=|
+                embedSWF\(?:\s*|
+                <object[^>]+data=|
+                new\s+SWFObject\(
+            )
+            (["\'])
+                (?P<url>(?:https?:)?//(?:www\.)?youtube(?:-nocookie)?\.com/
+                (?:embed|v|p)/[0-9A-Za-z_-]{11}.*?)
+            \1''', webpage)]
+
+        # lazyYT YouTube embed
+        entries.extend(list(map(
+            unescapeHTML,
+            re.findall(r'class="lazyYT" data-youtube-id="([^"]+)"', webpage))))
+
+        # Wordpress "YouTube Video Importer" plugin
+        matches = re.findall(r'''(?x)<div[^>]+
+            class=(?P<q1>[\'"])[^\'"]*\byvii_single_video_player\b[^\'"]*(?P=q1)[^>]+
+            data-video_id=(?P<q2>[\'"])([^\'"]+)(?P=q2)''', webpage)
+        entries.extend(m[-1] for m in matches)
+
+        return entries
+
+    @staticmethod
+    def _extract_url(webpage):
+        urls = YoutubeIE._extract_urls(webpage)
+        return urls[0] if urls else None
+
      @classmethod
      def extract_id(cls, url):
          mobj = re.match(cls._VALID_URL, url, re.VERBOSE)
          if mobj is None:
      @classmethod
      def extract_id(cls, url):
          mobj = re.match(cls._VALID_URL, url, re.VERBOSE)
          if mobj is None:
-            raise ExtractorError(u'Invalid URL: %s' % url)
+            raise ExtractorError('Invalid URL: %s' % url)
          video_id = mobj.group(2)
          return video_id
  
          video_id = mobj.group(2)
          return video_id
  
-    def _extract_from_m3u8(self, manifest_url, video_id):
-        url_map = {}
-        def _get_urls(_manifest):
-            lines = _manifest.split('\n')
-            urls = filter(lambda l: l and not l.startswith('#'),
-                            lines)
-            return urls
-        manifest = self._download_webpage(manifest_url, video_id, u'Downloading formats manifest')
-        formats_urls = _get_urls(manifest)
-        for format_url in formats_urls:
-            itag = self._search_regex(r'itag/(\d+?)/', format_url, 'itag')
-            url_map[itag] = format_url
-        return url_map
-
      def _extract_annotations(self, video_id):
          url = 'https://www.youtube.com/annotations_invideo?features=1&legacy=1&video_id=%s' % video_id
      def _extract_annotations(self, video_id):
          url = 'https://www.youtube.com/annotations_invideo?features=1&legacy=1&video_id=%s' % video_id
-        return self._download_webpage(url, video_id, note=u'Searching for annotations.', errnote=u'Unable to download video annotations.')
+        return self._download_webpage(url, video_id, note='Searching for annotations.', errnote='Unable to download video annotations.')
+
+    @staticmethod
+    def _extract_chapters(description, duration):
+        if not description:
+            return None
+        chapter_lines = re.findall(
+            r'(?:^|<br\s*/>)([^<]*<a[^>]+onclick=["\']yt\.www\.watch\.player\.seekTo[^>]+>(\d{1,2}:\d{1,2}(?::\d{1,2})?)</a>[^>]*)(?=$|<br\s*/>)',
+            description)
+        if not chapter_lines:
+            return None
+        chapters = []
+        for next_num, (chapter_line, time_point) in enumerate(
+                chapter_lines, start=1):
+            start_time = parse_duration(time_point)
+            if start_time is None:
+                continue
+            if start_time > duration:
+                break
+            end_time = (duration if next_num == len(chapter_lines)
+                        else parse_duration(chapter_lines[next_num][1]))
+            if end_time is None:
+                continue
+            if end_time > duration:
+                end_time = duration
+            if start_time > end_time:
+                break
+            chapter_title = re.sub(
+                r'<a[^>]+>[^<]+</a>', '', chapter_line).strip(' \t-')
+            chapter_title = re.sub(r'\s+', ' ', chapter_title)
+            chapters.append({
+                'start_time': start_time,
+                'end_time': end_time,
+                'title': chapter_title,
+            })
+        return chapters
  
      def _real_extract(self, url):
  
      def _real_extract(self, url):
+        url, smuggled_data = unsmuggle_url(url, {})
+
          proto = (
          proto = (
-            u'http' if self._downloader.params.get('prefer_insecure', False)
-            else u'https')
+            'http' if self._downloader.params.get('prefer_insecure', False)
+            else 'https')
+
+        start_time = None
+        end_time = None
+        parsed_url = compat_urllib_parse_urlparse(url)
+        for component in [parsed_url.fragment, parsed_url.query]:
+            query = compat_parse_qs(component)
+            if start_time is None and 't' in query:
+                start_time = parse_duration(query['t'][0])
+            if start_time is None and 'start' in query:
+                start_time = parse_duration(query['start'][0])
+            if end_time is None and 'end' in query:
+                end_time = parse_duration(query['end'][0])
  
          # Extract original video URL from URL with redirection, like age verification, using next_url parameter
          mobj = re.search(self._NEXT_URL_RE, url)
          if mobj:
  
          # Extract original video URL from URL with redirection, like age verification, using next_url parameter
          mobj = re.search(self._NEXT_URL_RE, url)
          if mobj:
-            url = proto + '://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
+            url = proto + '://www.youtube.com/' + compat_urllib_parse_unquote(mobj.group(1)).lstrip('/')
          video_id = self.extract_id(url)
  
          # Get video webpage
          video_id = self.extract_id(url)
  
          # Get video webpage
-        url = proto + '://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
+        url = proto + '://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1&bpctr=9999999999' % video_id
          video_webpage = self._download_webpage(url, video_id)
  
          # Attempt to extract SWF player URL
          video_webpage = self._download_webpage(url, video_id)
  
          # Attempt to extract SWF player URL
@@ -1051,78 +1495,223 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
          else:
              player_url = None
  
          else:
              player_url = None
  
+        dash_mpds = []
+
+        def add_dash_mpd(video_info):
+            dash_mpd = video_info.get('dashmpd')
+            if dash_mpd and dash_mpd[0] not in dash_mpds:
+                dash_mpds.append(dash_mpd[0])
+
+        is_live = None
+        view_count = None
+
+        def extract_view_count(v_info):
+            return int_or_none(try_get(v_info, lambda x: x['view_count'][0]))
+
          # Get video info
          # Get video info
-        self.report_video_info_webpage_download(video_id)
+        embed_webpage = None
          if re.search(r'player-age-gate-content">', video_webpage) is not None:
          if re.search(r'player-age-gate-content">', video_webpage) is not None:
-            self.report_age_confirmation()
              age_gate = True
              # We simulate the access to the video from www.youtube.com/v/{video_id}
              # this can be viewed without login into Youtube
              age_gate = True
              # We simulate the access to the video from www.youtube.com/v/{video_id}
              # this can be viewed without login into Youtube
-            data = compat_urllib_parse.urlencode({'video_id': video_id,
-                                                  'el': 'player_embedded',
-                                                  'gl': 'US',
-                                                  'hl': 'en',
-                                                  'eurl': 'https://youtube.googleapis.com/v/' + video_id,
-                                                  'asv': 3,
-                                                  'sts':'1588',
-                                                  })
+            url = proto + '://www.youtube.com/embed/%s' % video_id
+            embed_webpage = self._download_webpage(url, video_id, 'Downloading embed webpage')
+            data = compat_urllib_parse_urlencode({
+                'video_id': video_id,
+                'eurl': 'https://youtube.googleapis.com/v/' + video_id,
+                'sts': self._search_regex(
+                    r'"sts"\s*:\s*(\d+)', embed_webpage, 'sts', default=''),
+            })
              video_info_url = proto + '://www.youtube.com/get_video_info?' + data
              video_info_url = proto + '://www.youtube.com/get_video_info?' + data
-            video_info_webpage = self._download_webpage(video_info_url, video_id,
-                                    note=False,
-                                    errnote='unable to download video info webpage')
+            video_info_webpage = self._download_webpage(
+                video_info_url, video_id,
+                note='Refetching age-gated info webpage',
+                errnote='unable to download video info webpage')
              video_info = compat_parse_qs(video_info_webpage)
              video_info = compat_parse_qs(video_info_webpage)
+            add_dash_mpd(video_info)
          else:
              age_gate = False
          else:
              age_gate = False
-            for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
-                video_info_url = (proto + '://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
-                        % (video_id, el_type))
-                video_info_webpage = self._download_webpage(video_info_url, video_id,
-                                        note=False,
-                                        errnote='unable to download video info webpage')
-                video_info = compat_parse_qs(video_info_webpage)
-                if 'token' in video_info:
-                    break
+            video_info = None
+            sts = None
+            # Try looking directly into the video webpage
+            ytplayer_config = self._get_ytplayer_config(video_id, video_webpage)
+            if ytplayer_config:
+                args = ytplayer_config['args']
+                if args.get('url_encoded_fmt_stream_map'):
+                    # Convert to the same format returned by compat_parse_qs
+                    video_info = dict((k, [v]) for k, v in args.items())
+                    add_dash_mpd(video_info)
+                # Rental video is not rented but preview is available (e.g.
+                # https://www.youtube.com/watch?v=yYr8q0y5Jfg,
+                # https://github.com/rg3/youtube-dl/issues/10532)
+                if not video_info and args.get('ypc_vid'):
+                    return self.url_result(
+                        args['ypc_vid'], YoutubeIE.ie_key(), video_id=args['ypc_vid'])
+                if args.get('livestream') == '1' or args.get('live_playback') == 1:
+                    is_live = True
+                sts = ytplayer_config.get('sts')
+            if not video_info or self._downloader.params.get('youtube_include_dash_manifest', True):
+                # We also try looking in get_video_info since it may contain different dashmpd
+                # URL that points to a DASH manifest with possibly different itag set (some itags
+                # are missing from DASH manifest pointed by webpage's dashmpd, some - from DASH
+                # manifest pointed by get_video_info's dashmpd).
+                # The general idea is to take a union of itags of both DASH manifests (for example
+                # video with such 'manifest behavior' see https://github.com/rg3/youtube-dl/issues/6093)
+                self.report_video_info_webpage_download(video_id)
+                for el in ('info', 'embedded', 'detailpage', 'vevo', ''):
+                    query = {
+                        'video_id': video_id,
+                        'ps': 'default',
+                        'eurl': '',
+                        'gl': 'US',
+                        'hl': 'en',
+                    }
+                    if el:
+                        query['el'] = el
+                    if sts:
+                        query['sts'] = sts
+                    video_info_webpage = self._download_webpage(
+                        '%s://www.youtube.com/get_video_info' % proto,
+                        video_id, note=False,
+                        errnote='unable to download video info webpage',
+                        fatal=False, query=query)
+                    if not video_info_webpage:
+                        continue
+                    get_video_info = compat_parse_qs(video_info_webpage)
+                    add_dash_mpd(get_video_info)
+                    if view_count is None:
+                        view_count = extract_view_count(get_video_info)
+                    if not video_info:
+                        video_info = get_video_info
+                    if 'token' in get_video_info:
+                        # Different get_video_info requests may report different results, e.g.
+                        # some may report video unavailability, but some may serve it without
+                        # any complaint (see https://github.com/rg3/youtube-dl/issues/7362,
+                        # the original webpage as well as el=info and el=embedded get_video_info
+                        # requests report video unavailability due to geo restriction while
+                        # el=detailpage succeeds and returns valid data). This is probably
+                        # due to YouTube measures against IP ranges of hosting providers.
+                        # Working around by preferring the first succeeded video_info containing
+                        # the token if no such video_info yet was found.
+                        if 'token' not in video_info:
+                            video_info = get_video_info
+                        break
+
+        def extract_unavailable_message():
+            return self._html_search_regex(
+                r'(?s)<h1[^>]+id="unavailable-message"[^>]*>(.+?)</h1>',
+                video_webpage, 'unavailable message', default=None)
+
          if 'token' not in video_info:
              if 'reason' in video_info:
          if 'token' not in video_info:
              if 'reason' in video_info:
+                if 'The uploader has not made this video available in your country.' in video_info['reason']:
+                    regions_allowed = self._html_search_meta(
+                        'regionsAllowed', video_webpage, default=None)
+                    countries = regions_allowed.split(',') if regions_allowed else None
+                    self.raise_geo_restricted(
+                        msg=video_info['reason'][0], countries=countries)
+                reason = video_info['reason'][0]
+                if 'Invalid parameters' in reason:
+                    unavailable_message = extract_unavailable_message()
+                    if unavailable_message:
+                        reason = unavailable_message
                  raise ExtractorError(
                  raise ExtractorError(
-                    u'YouTube said: %s' % video_info['reason'][0],
+                    'YouTube said: %s' % reason,
                      expected=True, video_id=video_id)
              else:
                  raise ExtractorError(
                      expected=True, video_id=video_id)
              else:
                  raise ExtractorError(
-                    u'"token" parameter not in video info for unknown reason',
+                    '"token" parameter not in video info for unknown reason',
                      video_id=video_id)
  
                      video_id=video_id)
  
-        if 'view_count' in video_info:
-            view_count = int(video_info['view_count'][0])
+        # title
+        if 'title' in video_info:
+            video_title = video_info['title'][0]
+        else:
+            self._downloader.report_warning('Unable to extract video title')
+            video_title = '_'
+
+        # description
+        description_original = video_description = get_element_by_id("eow-description", video_webpage)
+        if video_description:
+
+            def replace_url(m):
+                redir_url = compat_urlparse.urljoin(url, m.group(1))
+                parsed_redir_url = compat_urllib_parse_urlparse(redir_url)
+                if re.search(r'^(?:www\.)?(?:youtube(?:-nocookie)?\.com|youtu\.be)$', parsed_redir_url.netloc) and parsed_redir_url.path == '/redirect':
+                    qs = compat_parse_qs(parsed_redir_url.query)
+                    q = qs.get('q')
+                    if q and q[0]:
+                        return q[0]
+                return redir_url
+
+            description_original = video_description = re.sub(r'''(?x)
+                <a\s+
+                    (?:[a-zA-Z-]+="[^"]*"\s+)*?
+                    (?:title|href)="([^"]+)"\s+
+                    (?:[a-zA-Z-]+="[^"]*"\s+)*?
+                    class="[^"]*"[^>]*>
+                [^<]+\.{3}\s*
+                </a>
+            ''', replace_url, video_description)
+            video_description = clean_html(video_description)
          else:
          else:
-            view_count = None
+            fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
+            if fd_mobj:
+                video_description = unescapeHTML(fd_mobj.group(1))
+            else:
+                video_description = ''
+
+        if 'multifeed_metadata_list' in video_info and not smuggled_data.get('force_singlefeed', False):
+            if not self._downloader.params.get('noplaylist'):
+                entries = []
+                feed_ids = []
+                multifeed_metadata_list = video_info['multifeed_metadata_list'][0]
+                for feed in multifeed_metadata_list.split(','):
+                    # Unquote should take place before split on comma (,) since textual
+                    # fields may contain comma as well (see
+                    # https://github.com/rg3/youtube-dl/issues/8536)
+                    feed_data = compat_parse_qs(compat_urllib_parse_unquote_plus(feed))
+                    entries.append({
+                        '_type': 'url_transparent',
+                        'ie_key': 'Youtube',
+                        'url': smuggle_url(
+                            '%s://www.youtube.com/watch?v=%s' % (proto, feed_data['id'][0]),
+                            {'force_singlefeed': True}),
+                        'title': '%s (%s)' % (video_title, feed_data['title'][0]),
+                    })
+                    feed_ids.append(feed_data['id'][0])
+                self.to_screen(
+                    'Downloading multifeed video (%s) - add --no-playlist to just download video %s'
+                    % (', '.join(feed_ids), video_id))
+                return self.playlist_result(entries, video_id, video_title, video_description)
+            self.to_screen('Downloading just video %s because of --no-playlist' % video_id)
+
+        if view_count is None:
+            view_count = extract_view_count(video_info)
  
          # Check for "rental" videos
          if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
  
          # Check for "rental" videos
          if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
-            raise ExtractorError(u'"rental" videos not supported')
+            raise ExtractorError('"rental" videos not supported. See https://github.com/rg3/youtube-dl/issues/359 for more information.', expected=True)
  
          # Start extracting information
          self.report_information_extraction(video_id)
  
          # uploader
          if 'author' not in video_info:
  
          # Start extracting information
          self.report_information_extraction(video_id)
  
          # uploader
          if 'author' not in video_info:
-            raise ExtractorError(u'Unable to extract uploader name')
-        video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
+            raise ExtractorError('Unable to extract uploader name')
+        video_uploader = compat_urllib_parse_unquote_plus(video_info['author'][0])
  
          # uploader_id
          video_uploader_id = None
  
          # uploader_id
          video_uploader_id = None
-        mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
+        video_uploader_url = None
+        mobj = re.search(
+            r'<link itemprop="url" href="(?P<uploader_url>https?://www\.youtube\.com/(?:user|channel)/(?P<uploader_id>[^"]+))">',
+            video_webpage)
          if mobj is not None:
          if mobj is not None:
-            video_uploader_id = mobj.group(1)
-        else:
-            self._downloader.report_warning(u'unable to extract uploader nickname')
-
-        # title
-        if 'title' in video_info:
-            video_title = video_info['title'][0]
+            video_uploader_id = mobj.group('uploader_id')
+            video_uploader_url = mobj.group('uploader_url')
          else:
          else:
-            self._downloader.report_warning(u'Unable to extract video title')
-            video_title = u'_'
+            self._downloader.report_warning('unable to extract uploader nickname')
  
          # thumbnail image
          # We try first to get a high quality image:
  
          # thumbnail image
          # We try first to get a high quality image:
@@ -1131,23 +1720,61 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
          if m_thumb is not None:
              video_thumbnail = m_thumb.group(1)
          elif 'thumbnail_url' not in video_info:
          if m_thumb is not None:
              video_thumbnail = m_thumb.group(1)
          elif 'thumbnail_url' not in video_info:
-            self._downloader.report_warning(u'unable to extract video thumbnail')
+            self._downloader.report_warning('unable to extract video thumbnail')
              video_thumbnail = None
          else:   # don't panic if we can't find it
              video_thumbnail = None
          else:   # don't panic if we can't find it
-            video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
+            video_thumbnail = compat_urllib_parse_unquote_plus(video_info['thumbnail_url'][0])
  
          # upload date
  
          # upload date
-        upload_date = None
-        mobj = re.search(r'(?s)id="eow-date.*?>(.*?)</span>', video_webpage)
-        if mobj is None:
-            mobj = re.search(
-                r'(?s)id="watch-uploader-info".*?>.*?(?:Published|Uploaded|Streamed live) on (.*?)</strong>',
-                video_webpage)
-        if mobj is not None:
-            upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
-            upload_date = unified_strdate(upload_date)
+        upload_date = self._html_search_meta(
+            'datePublished', video_webpage, 'upload date', default=None)
+        if not upload_date:
+            upload_date = self._search_regex(
+                [r'(?s)id="eow-date.*?>(.*?)</span>',
+                 r'(?:id="watch-uploader-info".*?>.*?|["\']simpleText["\']\s*:\s*["\'])(?:Published|Uploaded|Streamed live|Started) on (.+?)[<"\']'],
+                video_webpage, 'upload date', default=None)
+        upload_date = unified_strdate(upload_date)
+
+        video_license = self._html_search_regex(
+            r'<h4[^>]+class="title"[^>]*>\s*License\s*</h4>\s*<ul[^>]*>\s*<li>(.+?)</li',
+            video_webpage, 'license', default=None)
+
+        m_music = re.search(
+            r'''(?x)
+                <h4[^>]+class="title"[^>]*>\s*Music\s*</h4>\s*
+                <ul[^>]*>\s*
+                <li>(?P<title>.+?)
+                by (?P<creator>.+?)
+                (?:
+                    \(.+?\)|
+                    <a[^>]*
+                        (?:
+                            \bhref=["\']/red[^>]*>|             # drop possible
+                            >\s*Listen ad-free with YouTube Red # YouTube Red ad
+                        )
+                    .*?
+                )?</li
+            ''',
+            video_webpage)
+        if m_music:
+            video_alt_title = remove_quotes(unescapeHTML(m_music.group('title')))
+            video_creator = clean_html(m_music.group('creator'))
+        else:
+            video_alt_title = video_creator = None
+
+        m_episode = re.search(
+            r'<div[^>]+id="watch7-headline"[^>]*>\s*<span[^>]*>.*?>(?P<series>[^<]+)</a></b>\s*S(?P<season>\d+)\s*•\s*E(?P<episode>\d+)</span>',
+            video_webpage)
+        if m_episode:
+            series = m_episode.group('series')
+            season_number = int(m_episode.group('season'))
+            episode_number = int(m_episode.group('episode'))
+        else:
+            series = season_number = episode_number = None
  
  
-        m_cat_container = get_element_by_id("eow-category", video_webpage)
+        m_cat_container = self._search_regex(
+            r'(?s)<h4[^>]*>\s*Category\s*</h4>\s*<ul[^>]*>(.*?)</ul>',
+            video_webpage, 'categories', default=None)
          if m_cat_container:
              category = self._html_search_regex(
                  r'(?s)<a[^<]+>(.*?)</a>', m_cat_container, 'category',
          if m_cat_container:
              category = self._html_search_regex(
                  r'(?s)<a[^<]+>(.*?)</a>', m_cat_container, 'category',
@@ -1156,92 +1783,35 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
          else:
              video_categories = None
  
          else:
              video_categories = None
  
-        # description
-        video_description = get_element_by_id("eow-description", video_webpage)
-        if video_description:
-            video_description = re.sub(r'''(?x)
-                <a\s+
-                    (?:[a-zA-Z-]+="[^"]+"\s+)*?
-                    title="([^"]+)"\s+
-                    (?:[a-zA-Z-]+="[^"]+"\s+)*?
-                    class="yt-uix-redirect-link"\s*>
-                [^<]+
-                </a>
-            ''', r'\1', video_description)
-            video_description = clean_html(video_description)
-        else:
-            fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
-            if fd_mobj:
-                video_description = unescapeHTML(fd_mobj.group(1))
-            else:
-                video_description = u''
-
-        def _extract_count(klass):
-            count = self._search_regex(
-                r'class="%s">([\d,]+)</span>' % re.escape(klass),
-                video_webpage, klass, default=None)
-            if count is not None:
-                return int(count.replace(',', ''))
-            return None
-        like_count = _extract_count(u'likes-count')
-        dislike_count = _extract_count(u'dislikes-count')
+        video_tags = [
+            unescapeHTML(m.group('content'))
+            for m in re.finditer(self._meta_regex('og:video:tag'), video_webpage)]
+
+        def _extract_count(count_name):
+            return str_to_int(self._search_regex(
+                r'-%s-button[^>]+><span[^>]+class="yt-uix-button-content"[^>]*>([\d,]+)</span>'
+                % re.escape(count_name),
+                video_webpage, count_name, default=None))
+
+        like_count = _extract_count('like')
+        dislike_count = _extract_count('dislike')
  
          # subtitles
          video_subtitles = self.extract_subtitles(video_id, video_webpage)
  
          # subtitles
          video_subtitles = self.extract_subtitles(video_id, video_webpage)
+        automatic_captions = self.extract_automatic_captions(video_id, video_webpage)
  
  
-        if self._downloader.params.get('listsubtitles', False):
-            self._list_available_subtitles(video_id, video_webpage)
-            return
-
-        if 'length_seconds' not in video_info:
-            self._downloader.report_warning(u'unable to extract video duration')
-            video_duration = None
-        else:
-            video_duration = int(compat_urllib_parse.unquote_plus(video_info['length_seconds'][0]))
+        video_duration = try_get(
+            video_info, lambda x: int_or_none(x['length_seconds'][0]))
+        if not video_duration:
+            video_duration = parse_duration(self._html_search_meta(
+                'duration', video_webpage, 'video duration'))
  
          # annotations
          video_annotations = None
          if self._downloader.params.get('writeannotations', False):
  
          # annotations
          video_annotations = None
          if self._downloader.params.get('writeannotations', False):
-                video_annotations = self._extract_annotations(video_id)
+            video_annotations = self._extract_annotations(video_id)
  
  
-        # Decide which formats to download
-        try:
-            mobj = re.search(r';ytplayer\.config\s*=\s*({.*?});', video_webpage)
-            if not mobj:
-                raise ValueError('Could not find vevo ID')
-            json_code = uppercase_escape(mobj.group(1))
-            ytplayer_config = json.loads(json_code)
-            args = ytplayer_config['args']
-            # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
-            # this signatures are encrypted
-            if 'url_encoded_fmt_stream_map' not in args:
-                raise ValueError(u'No stream_map present')  # caught below
-            re_signature = re.compile(r'[&,]s=')
-            m_s = re_signature.search(args['url_encoded_fmt_stream_map'])
-            if m_s is not None:
-                self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
-                video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
-            m_s = re_signature.search(args.get('adaptive_fmts', u''))
-            if m_s is not None:
-                if 'adaptive_fmts' in video_info:
-                    video_info['adaptive_fmts'][0] += ',' + args['adaptive_fmts']
-                else:
-                    video_info['adaptive_fmts'] = [args['adaptive_fmts']]
-        except ValueError:
-            pass
-
-        def _map_to_format_list(urlmap):
-            formats = []
-            for itag, video_real_url in urlmap.items():
-                dct = {
-                    'format_id': itag,
-                    'url': video_real_url,
-                    'player_url': player_url,
-                }
-                if itag in self._formats:
-                    dct.update(self._formats[itag])
-                formats.append(dct)
-            return formats
+        chapters = self._extract_chapters(description_original, video_duration)
  
          if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
              self.report_rtmp_download()
  
          if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
              self.report_rtmp_download()
@@ -1251,298 +1821,606 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                  'url': video_info['conn'][0],
                  'player_url': player_url,
              }]
                  'url': video_info['conn'][0],
                  'player_url': player_url,
              }]
-        elif len(video_info.get('url_encoded_fmt_stream_map', [])) >= 1 or len(video_info.get('adaptive_fmts', [])) >= 1:
-            encoded_url_map = video_info.get('url_encoded_fmt_stream_map', [''])[0] + ',' + video_info.get('adaptive_fmts',[''])[0]
+        elif not is_live and (len(video_info.get('url_encoded_fmt_stream_map', [''])[0]) >= 1 or len(video_info.get('adaptive_fmts', [''])[0]) >= 1):
+            encoded_url_map = video_info.get('url_encoded_fmt_stream_map', [''])[0] + ',' + video_info.get('adaptive_fmts', [''])[0]
              if 'rtmpe%3Dyes' in encoded_url_map:
                  raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
              if 'rtmpe%3Dyes' in encoded_url_map:
                  raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
-            url_map = {}
+            formats_spec = {}
+            fmt_list = video_info.get('fmt_list', [''])[0]
+            if fmt_list:
+                for fmt in fmt_list.split(','):
+                    spec = fmt.split('/')
+                    if len(spec) > 1:
+                        width_height = spec[1].split('x')
+                        if len(width_height) == 2:
+                            formats_spec[spec[0]] = {
+                                'resolution': spec[1],
+                                'width': int_or_none(width_height[0]),
+                                'height': int_or_none(width_height[1]),
+                            }
+            formats = []
              for url_data_str in encoded_url_map.split(','):
                  url_data = compat_parse_qs(url_data_str)
              for url_data_str in encoded_url_map.split(','):
                  url_data = compat_parse_qs(url_data_str)
-                if 'itag' in url_data and 'url' in url_data:
-                    url = url_data['url'][0]
-                    if 'sig' in url_data:
-                        url += '&signature=' + url_data['sig'][0]
-                    elif 's' in url_data:
-                        encrypted_sig = url_data['s'][0]
-                        if self._downloader.params.get('verbose'):
-                            if age_gate:
-                                if player_url is None:
-                                    player_version = 'unknown'
-                                else:
-                                    player_version = self._search_regex(
-                                        r'-(.+)\.swf$', player_url,
-                                        u'flash player', fatal=False)
+                if 'itag' not in url_data or 'url' not in url_data:
+                    continue
+                format_id = url_data['itag'][0]
+                url = url_data['url'][0]
+
+                if 's' in url_data or self._downloader.params.get('youtube_include_dash_manifest', True):
+                    ASSETS_RE = r'"assets":.+?"js":\s*("[^"]+")'
+                    jsplayer_url_json = self._search_regex(
+                        ASSETS_RE,
+                        embed_webpage if age_gate else video_webpage,
+                        'JS player URL (1)', default=None)
+                    if not jsplayer_url_json and not age_gate:
+                        # We need the embed website after all
+                        if embed_webpage is None:
+                            embed_url = proto + '://www.youtube.com/embed/%s' % video_id
+                            embed_webpage = self._download_webpage(
+                                embed_url, video_id, 'Downloading embed webpage')
+                        jsplayer_url_json = self._search_regex(
+                            ASSETS_RE, embed_webpage, 'JS player URL')
+
+                    player_url = json.loads(jsplayer_url_json)
+                    if player_url is None:
+                        player_url_json = self._search_regex(
+                            r'ytplayer\.config.*?"url"\s*:\s*("[^"]+")',
+                            video_webpage, 'age gate player URL')
+                        player_url = json.loads(player_url_json)
+
+                if 'sig' in url_data:
+                    url += '&signature=' + url_data['sig'][0]
+                elif 's' in url_data:
+                    encrypted_sig = url_data['s'][0]
+
+                    if self._downloader.params.get('verbose'):
+                        if player_url is None:
+                            player_version = 'unknown'
+                            player_desc = 'unknown'
+                        else:
+                            if player_url.endswith('swf'):
+                                player_version = self._search_regex(
+                                    r'-(.+?)(?:/watch_as3)?\.swf$', player_url,
+                                    'flash player', fatal=False)
                                  player_desc = 'flash player %s' % player_version
                              else:
                                  player_version = self._search_regex(
                                  player_desc = 'flash player %s' % player_version
                              else:
                                  player_version = self._search_regex(
-                                    r'html5player-(.+?)\.js', video_webpage,
+                                    [r'html5player-([^/]+?)(?:/html5player(?:-new)?)?\.js',
+                                     r'(?:www|player)-([^/]+)(?:/[a-z]{2}_[A-Z]{2})?/base\.js'],
+                                    player_url,
                                      'html5 player', fatal=False)
                                      'html5 player', fatal=False)
-                                player_desc = u'html5 player %s' % player_version
-
-                            parts_sizes = u'.'.join(compat_str(len(part)) for part in encrypted_sig.split('.'))
-                            self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
-                                (len(encrypted_sig), parts_sizes, url_data['itag'][0], player_desc))
-
-                        if not age_gate:
-                            jsplayer_url_json = self._search_regex(
-                                r'"assets":.+?"js":\s*("[^"]+")',
-                                video_webpage, u'JS player URL')
-                            player_url = json.loads(jsplayer_url_json)
-
-                        signature = self._decrypt_signature(
-                            encrypted_sig, video_id, player_url, age_gate)
-                        url += '&signature=' + signature
-                    if 'ratebypass' not in url:
-                        url += '&ratebypass=yes'
-                    url_map[url_data['itag'][0]] = url
-            formats = _map_to_format_list(url_map)
+                                player_desc = 'html5 player %s' % player_version
+
+                        parts_sizes = self._signature_cache_id(encrypted_sig)
+                        self.to_screen('{%s} signature length %s, %s' %
+                                       (format_id, parts_sizes, player_desc))
+
+                    signature = self._decrypt_signature(
+                        encrypted_sig, video_id, player_url, age_gate)
+                    url += '&signature=' + signature
+                if 'ratebypass' not in url:
+                    url += '&ratebypass=yes'
+
+                dct = {
+                    'format_id': format_id,
+                    'url': url,
+                    'player_url': player_url,
+                }
+                if format_id in self._formats:
+                    dct.update(self._formats[format_id])
+                if format_id in formats_spec:
+                    dct.update(formats_spec[format_id])
+
+                # Some itags are not included in DASH manifest thus corresponding formats will
+                # lack metadata (see https://github.com/rg3/youtube-dl/pull/5993).
+                # Trying to extract metadata from url_encoded_fmt_stream_map entry.
+                mobj = re.search(r'^(?P<width>\d+)[xX](?P<height>\d+)$', url_data.get('size', [''])[0])
+                width, height = (int(mobj.group('width')), int(mobj.group('height'))) if mobj else (None, None)
+
+                more_fields = {
+                    'filesize': int_or_none(url_data.get('clen', [None])[0]),
+                    'tbr': float_or_none(url_data.get('bitrate', [None])[0], 1000),
+                    'width': width,
+                    'height': height,
+                    'fps': int_or_none(url_data.get('fps', [None])[0]),
+                    'format_note': url_data.get('quality_label', [None])[0] or url_data.get('quality', [None])[0],
+                }
+                for key, value in more_fields.items():
+                    if value:
+                        dct[key] = value
+                type_ = url_data.get('type', [None])[0]
+                if type_:
+                    type_split = type_.split(';')
+                    kind_ext = type_split[0].split('/')
+                    if len(kind_ext) == 2:
+                        kind, _ = kind_ext
+                        dct['ext'] = mimetype2ext(type_split[0])
+                        if kind in ('audio', 'video'):
+                            codecs = None
+                            for mobj in re.finditer(
+                                    r'(?P<key>[a-zA-Z_-]+)=(?P<quote>["\']?)(?P<val>.+?)(?P=quote)(?:;|$)', type_):
+                                if mobj.group('key') == 'codecs':
+                                    codecs = mobj.group('val')
+                                    break
+                            if codecs:
+                                dct.update(parse_codecs(codecs))
+                if dct.get('acodec') == 'none' or dct.get('vcodec') == 'none':
+                    dct['downloader_options'] = {
+                        # Youtube throttles chunks >~10M
+                        'http_chunk_size': 10485760,
+                    }
+                formats.append(dct)
          elif video_info.get('hlsvp'):
              manifest_url = video_info['hlsvp'][0]
          elif video_info.get('hlsvp'):
              manifest_url = video_info['hlsvp'][0]
-            url_map = self._extract_from_m3u8(manifest_url, video_id)
-            formats = _map_to_format_list(url_map)
+            formats = []
+            m3u8_formats = self._extract_m3u8_formats(
+                manifest_url, video_id, 'mp4', fatal=False)
+            for a_format in m3u8_formats:
+                itag = self._search_regex(
+                    r'/itag/(\d+)/', a_format['url'], 'itag', default=None)
+                if itag:
+                    a_format['format_id'] = itag
+                    if itag in self._formats:
+                        dct = self._formats[itag].copy()
+                        dct.update(a_format)
+                        a_format = dct
+                a_format['player_url'] = player_url
+                # Accept-Encoding header causes failures in live streams on Youtube and Youtube Gaming
+                a_format.setdefault('http_headers', {})['Youtubedl-no-compression'] = 'True'
+                formats.append(a_format)
          else:
          else:
-            raise ExtractorError(u'no conn, hlsvp or url_encoded_fmt_stream_map information found in video info')
+            unavailable_message = extract_unavailable_message()
+            if unavailable_message:
+                raise ExtractorError(unavailable_message, expected=True)
+            raise ExtractorError('no conn, hlsvp or url_encoded_fmt_stream_map information found in video info')
  
          # Look for the DASH manifest
  
          # Look for the DASH manifest
-        if (self._downloader.params.get('youtube_include_dash_manifest', False)):
-            try:
-                # The DASH manifest used needs to be the one from the original video_webpage.
-                # The one found in get_video_info seems to be using different signatures.
-                # However, in the case of an age restriction there won't be any embedded dashmpd in the video_webpage.
-                # Luckily, it seems, this case uses some kind of default signature (len == 86), so the
-                # combination of get_video_info and the _static_decrypt_signature() decryption fallback will work here.
-                if age_gate:
-                    dash_manifest_url = video_info.get('dashmpd')[0]
-                else:
-                    dash_manifest_url = ytplayer_config['args']['dashmpd']
-                def decrypt_sig(mobj):
-                    s = mobj.group(1)
-                    dec_s = self._decrypt_signature(s, video_id, player_url, age_gate)
-                    return '/signature/%s' % dec_s
-                dash_manifest_url = re.sub(r'/s/([\w\.]+)', decrypt_sig, dash_manifest_url)
-                dash_doc = self._download_xml(
-                    dash_manifest_url, video_id,
-                    note=u'Downloading DASH manifest',
-                    errnote=u'Could not download DASH manifest')
-                for r in dash_doc.findall(u'.//{urn:mpeg:DASH:schema:MPD:2011}Representation'):
-                    url_el = r.find('{urn:mpeg:DASH:schema:MPD:2011}BaseURL')
-                    if url_el is None:
-                        continue
-                    format_id = r.attrib['id']
-                    video_url = url_el.text
-                    filesize = int_or_none(url_el.attrib.get('{http://youtube.com/yt/2012/10/10}contentLength'))
-                    f = {
-                        'format_id': format_id,
-                        'url': video_url,
-                        'width': int_or_none(r.attrib.get('width')),
-                        'tbr': int_or_none(r.attrib.get('bandwidth'), 1000),
-                        'asr': int_or_none(r.attrib.get('audioSamplingRate')),
-                        'filesize': filesize,
-                    }
-                    try:
-                        existing_format = next(
-                            fo for fo in formats
-                            if fo['format_id'] == format_id)
-                    except StopIteration:
-                        f.update(self._formats.get(format_id, {}))
-                        formats.append(f)
-                    else:
-                        existing_format.update(f)
-
-            except (ExtractorError, KeyError) as e:
-                self.report_warning(u'Skipping DASH manifest: %s' % e, video_id)
+        if self._downloader.params.get('youtube_include_dash_manifest', True):
+            dash_mpd_fatal = True
+            for mpd_url in dash_mpds:
+                dash_formats = {}
+                try:
+                    def decrypt_sig(mobj):
+                        s = mobj.group(1)
+                        dec_s = self._decrypt_signature(s, video_id, player_url, age_gate)
+                        return '/signature/%s' % dec_s
+
+                    mpd_url = re.sub(r'/s/([a-fA-F0-9\.]+)', decrypt_sig, mpd_url)
+
+                    for df in self._extract_mpd_formats(
+                            mpd_url, video_id, fatal=dash_mpd_fatal,
+                            formats_dict=self._formats):
+                        # Do not overwrite DASH format found in some previous DASH manifest
+                        if df['format_id'] not in dash_formats:
+                            dash_formats[df['format_id']] = df
+                        # Additional DASH manifests may end up in HTTP Error 403 therefore
+                        # allow them to fail without bug report message if we already have
+                        # some DASH manifest succeeded. This is temporary workaround to reduce
+                        # burst of bug reports until we figure out the reason and whether it
+                        # can be fixed at all.
+                        dash_mpd_fatal = False
+                except (ExtractorError, KeyError) as e:
+                    self.report_warning(
+                        'Skipping DASH manifest: %r' % e, video_id)
+                if dash_formats:
+                    # Remove the formats we found through non-DASH, they
+                    # contain less info and it can be wrong, because we use
+                    # fixed values (for example the resolution). See
+                    # https://github.com/rg3/youtube-dl/issues/5774 for an
+                    # example.
+                    formats = [f for f in formats if f['format_id'] not in dash_formats.keys()]
+                    formats.extend(dash_formats.values())
+
+        # Check for malformed aspect ratio
+        stretched_m = re.search(
+            r'<meta\s+property="og:video:tag".*?content="yt:stretch=(?P<w>[0-9]+):(?P<h>[0-9]+)">',
+            video_webpage)
+        if stretched_m:
+            w = float(stretched_m.group('w'))
+            h = float(stretched_m.group('h'))
+            # yt:stretch may hold invalid ratio data (e.g. for Q39EVAstoRM ratio is 17:0).
+            # We will only process correct ratios.
+            if w > 0 and h > 0:
+                ratio = w / h
+                for f in formats:
+                    if f.get('vcodec') != 'none':
+                        f['stretched_ratio'] = ratio
  
          self._sort_formats(formats)
  
  
          self._sort_formats(formats)
  
+        self.mark_watched(video_id, video_info)
+
          return {
          return {
-            'id':           video_id,
-            'uploader':     video_uploader,
-            'uploader_id':  video_uploader_id,
-            'upload_date':  upload_date,
-            'title':        video_title,
-            'thumbnail':    video_thumbnail,
-            'description':  video_description,
-            'categories':   video_categories,
-            'subtitles':    video_subtitles,
-            'duration':     video_duration,
-            'age_limit':    18 if age_gate else 0,
-            'annotations':  video_annotations,
+            'id': video_id,
+            'uploader': video_uploader,
+            'uploader_id': video_uploader_id,
+            'uploader_url': video_uploader_url,
+            'upload_date': upload_date,
+            'license': video_license,
+            'creator': video_creator,
+            'title': video_title,
+            'alt_title': video_alt_title,
+            'thumbnail': video_thumbnail,
+            'description': video_description,
+            'categories': video_categories,
+            'tags': video_tags,
+            'subtitles': video_subtitles,
+            'automatic_captions': automatic_captions,
+            'duration': video_duration,
+            'age_limit': 18 if age_gate else 0,
+            'annotations': video_annotations,
+            'chapters': chapters,
              'webpage_url': proto + '://www.youtube.com/watch?v=%s' % video_id,
              'webpage_url': proto + '://www.youtube.com/watch?v=%s' % video_id,
-            'view_count':   view_count,
+            'view_count': view_count,
              'like_count': like_count,
              'dislike_count': dislike_count,
              'like_count': like_count,
              'dislike_count': dislike_count,
-            'formats':      formats,
+            'average_rating': float_or_none(video_info.get('avg_rating', [None])[0]),
+            'formats': formats,
+            'is_live': is_live,
+            'start_time': start_time,
+            'end_time': end_time,
+            'series': series,
+            'season_number': season_number,
+            'episode_number': episode_number,
          }
  
          }
  
-class YoutubePlaylistIE(YoutubeBaseInfoExtractor):
-    IE_DESC = u'YouTube.com playlists'
+
+class YoutubePlaylistIE(YoutubePlaylistBaseInfoExtractor):
+    IE_DESC = 'YouTube.com playlists'
      _VALID_URL = r"""(?x)(?:
                          (?:https?://)?
                          (?:\w+\.)?
      _VALID_URL = r"""(?x)(?:
                          (?:https?://)?
                          (?:\w+\.)?
-                        youtube\.com/
                          (?:
                          (?:
-                           (?:course|view_play_list|my_playlists|artist|playlist|watch)
-                           \? (?:.*?&)*? (?:p|a|list)=
-                        |  p/
+                            youtube\.com/
+                            (?:
+                               (?:course|view_play_list|my_playlists|artist|playlist|watch|embed/(?:videoseries|[0-9A-Za-z_-]{11}))
+                               \? (?:.*?[&;])*? (?:p|a|list)=
+                            |  p/
+                            )|
+                            youtu\.be/[0-9A-Za-z_-]{11}\?.*?\blist=
                          )
                          (
                          )
                          (
-                            (?:PL|EC|UU|FL|RD)?[0-9A-Za-z-_]{10,}
-                            # Top tracks, they can also include dots 
+                            (?:PL|LL|EC|UU|FL|RD|UL|TL)?[0-9A-Za-z-_]{10,}
+                            # Top tracks, they can also include dots
                              |(?:MC)[\w\.]*
                          )
                          .*
                       |
                              |(?:MC)[\w\.]*
                          )
                          .*
                       |
-                        ((?:PL|EC|UU|FL|RD)[0-9A-Za-z-_]{10,})
-                     )"""
+                        (%(playlist_id)s)
+                     )""" % {'playlist_id': YoutubeBaseInfoExtractor._PLAYLIST_ID_RE}
      _TEMPLATE_URL = 'https://www.youtube.com/playlist?list=%s'
      _TEMPLATE_URL = 'https://www.youtube.com/playlist?list=%s'
-    _MORE_PAGES_INDICATOR = r'data-link-type="next"'
-    _VIDEO_RE = r'href="\s*/watch\?v=(?P<id>[0-9A-Za-z_-]{11})&amp;[^"]*?index=(?P<index>\d+)'
-    IE_NAME = u'youtube:playlist'
+    _VIDEO_RE = r'href="\s*/watch\?v=(?P<id>[0-9A-Za-z_-]{11})&amp;[^"]*?index=(?P<index>\d+)(?:[^>]+>(?P<title>[^<]+))?'
+    IE_NAME = 'youtube:playlist'
+    _TESTS = [{
+        'url': 'https://www.youtube.com/playlist?list=PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re',
+        'info_dict': {
+            'title': 'ytdl test PL',
+            'id': 'PLwiyx1dc3P2JR9N8gQaQN_BCvlSlap7re',
+        },
+        'playlist_count': 3,
+    }, {
+        'url': 'https://www.youtube.com/playlist?list=PLtPgu7CB4gbZDA7i_euNxn75ISqxwZPYx',
+        'info_dict': {
+            'id': 'PLtPgu7CB4gbZDA7i_euNxn75ISqxwZPYx',
+            'title': 'YDL_Empty_List',
+        },
+        'playlist_count': 0,
+        'skip': 'This playlist is private',
+    }, {
+        'note': 'Playlist with deleted videos (#651). As a bonus, the video #51 is also twice in this list.',
+        'url': 'https://www.youtube.com/playlist?list=PLwP_SiAcdui0KVebT0mU9Apz359a4ubsC',
+        'info_dict': {
+            'title': '29C3: Not my department',
+            'id': 'PLwP_SiAcdui0KVebT0mU9Apz359a4ubsC',
+        },
+        'playlist_count': 95,
+    }, {
+        'note': 'issue #673',
+        'url': 'PLBB231211A4F62143',
+        'info_dict': {
+            'title': '[OLD]Team Fortress 2 (Class-based LP)',
+            'id': 'PLBB231211A4F62143',
+        },
+        'playlist_mincount': 26,
+    }, {
+        'note': 'Large playlist',
+        'url': 'https://www.youtube.com/playlist?list=UUBABnxM4Ar9ten8Mdjj1j0Q',
+        'info_dict': {
+            'title': 'Uploads from Cauchemar',
+            'id': 'UUBABnxM4Ar9ten8Mdjj1j0Q',
+        },
+        'playlist_mincount': 799,
+    }, {
+        'url': 'PLtPgu7CB4gbY9oDN3drwC3cMbJggS7dKl',
+        'info_dict': {
+            'title': 'YDL_safe_search',
+            'id': 'PLtPgu7CB4gbY9oDN3drwC3cMbJggS7dKl',
+        },
+        'playlist_count': 2,
+        'skip': 'This playlist is private',
+    }, {
+        'note': 'embedded',
+        'url': 'https://www.youtube.com/embed/videoseries?list=PL6IaIsEjSbf96XFRuNccS_RuEXwNdsoEu',
+        'playlist_count': 4,
+        'info_dict': {
+            'title': 'JODA15',
+            'id': 'PL6IaIsEjSbf96XFRuNccS_RuEXwNdsoEu',
+        }
+    }, {
+        'url': 'http://www.youtube.com/embed/_xDOZElKyNU?list=PLsyOSbh5bs16vubvKePAQ1x3PhKavfBIl',
+        'playlist_mincount': 485,
+        'info_dict': {
+            'title': '2017 華語最新單曲 (2/24更新)',
+            'id': 'PLsyOSbh5bs16vubvKePAQ1x3PhKavfBIl',
+        }
+    }, {
+        'note': 'Embedded SWF player',
+        'url': 'https://www.youtube.com/p/YN5VISEtHet5D4NEvfTd0zcgFk84NqFZ?hl=en_US&fs=1&rel=0',
+        'playlist_count': 4,
+        'info_dict': {
+            'title': 'JODA7',
+            'id': 'YN5VISEtHet5D4NEvfTd0zcgFk84NqFZ',
+        }
+    }, {
+        'note': 'Buggy playlist: the webpage has a "Load more" button but it doesn\'t have more videos',
+        'url': 'https://www.youtube.com/playlist?list=UUXw-G3eDE9trcvY2sBMM_aA',
+        'info_dict': {
+            'title': 'Uploads from Interstellar Movie',
+            'id': 'UUXw-G3eDE9trcvY2sBMM_aA',
+        },
+        'playlist_mincount': 21,
+    }, {
+        # Playlist URL that does not actually serve a playlist
+        'url': 'https://www.youtube.com/watch?v=FqZTN594JQw&list=PLMYEtVRpaqY00V9W81Cwmzp6N6vZqfUKD4',
+        'info_dict': {
+            'id': 'FqZTN594JQw',
+            'ext': 'webm',
+            'title': "Smiley's People 01 detective, Adventure Series, Action",
+            'uploader': 'STREEM',
+            'uploader_id': 'UCyPhqAZgwYWZfxElWVbVJng',
+            'uploader_url': r're:https?://(?:www\.)?youtube\.com/channel/UCyPhqAZgwYWZfxElWVbVJng',
+            'upload_date': '20150526',
+            'license': 'Standard YouTube License',
+            'description': 'md5:507cdcb5a49ac0da37a920ece610be80',
+            'categories': ['People & Blogs'],
+            'tags': list,
+            'like_count': int,
+            'dislike_count': int,
+        },
+        'params': {
+            'skip_download': True,
+        },
+        'add_ie': [YoutubeIE.ie_key()],
+    }, {
+        'url': 'https://youtu.be/yeWKywCrFtk?list=PL2qgrgXsNUG5ig9cat4ohreBjYLAPC0J5',
+        'info_dict': {
+            'id': 'yeWKywCrFtk',
+            'ext': 'mp4',
+            'title': 'Small Scale Baler and Braiding Rugs',
+            'uploader': 'Backus-Page House Museum',
+            'uploader_id': 'backuspagemuseum',
+            'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/backuspagemuseum',
+            'upload_date': '20161008',
+            'license': 'Standard YouTube License',
+            'description': 'md5:800c0c78d5eb128500bffd4f0b4f2e8a',
+            'categories': ['Nonprofits & Activism'],
+            'tags': list,
+            'like_count': int,
+            'dislike_count': int,
+        },
+        'params': {
+            'noplaylist': True,
+            'skip_download': True,
+        },
+    }, {
+        'url': 'https://youtu.be/uWyaPkt-VOI?list=PL9D9FC436B881BA21',
+        'only_matching': True,
+    }, {
+        'url': 'TLGGrESM50VT6acwMjAyMjAxNw',
+        'only_matching': True,
+    }]
  
      def _real_initialize(self):
          self._login()
  
  
      def _real_initialize(self):
          self._login()
  
-    def _ids_to_results(self, ids):
-        return [self.url_result(vid_id, 'Youtube', video_id=vid_id)
-                       for vid_id in ids]
-
      def _extract_mix(self, playlist_id):
      def _extract_mix(self, playlist_id):
-        # The mixes are generated from a a single video
+        # The mixes are generated from a single video
          # the id of the playlist is just 'RD' + video_id
          # the id of the playlist is just 'RD' + video_id
-        url = 'https://youtube.com/watch?v=%s&list=%s' % (playlist_id[-11:], playlist_id)
-        webpage = self._download_webpage(url, playlist_id, u'Downloading Youtube mix')
+        ids = []
+        last_id = playlist_id[-11:]
+        for n in itertools.count(1):
+            url = 'https://youtube.com/watch?v=%s&list=%s' % (last_id, playlist_id)
+            webpage = self._download_webpage(
+                url, playlist_id, 'Downloading page {0} of Youtube mix'.format(n))
+            new_ids = orderedSet(re.findall(
+                r'''(?xs)data-video-username=".*?".*?
+                           href="/watch\?v=([0-9A-Za-z_-]{11})&amp;[^"]*?list=%s''' % re.escape(playlist_id),
+                webpage))
+            # Fetch new pages until all the videos are repeated, it seems that
+            # there are always 51 unique videos.
+            new_ids = [_id for _id in new_ids if _id not in ids]
+            if not new_ids:
+                break
+            ids.extend(new_ids)
+            last_id = ids[-1]
+
+        url_results = self._ids_to_results(ids)
+
          search_title = lambda class_name: get_element_by_attribute('class', class_name, webpage)
          search_title = lambda class_name: get_element_by_attribute('class', class_name, webpage)
-        title_span = (search_title('playlist-title') or
-            search_title('title long-title') or search_title('title'))
+        title_span = (
+            search_title('playlist-title') or
+            search_title('title long-title') or
+            search_title('title'))
          title = clean_html(title_span)
          title = clean_html(title_span)
-        video_re = r'''(?x)data-video-username=".*?".*?
-                       href="/watch\?v=([0-9A-Za-z_-]{11})&amp;[^"]*?list=%s''' % re.escape(playlist_id)
-        ids = orderedSet(re.findall(video_re, webpage, flags=re.DOTALL))
-        url_results = self._ids_to_results(ids)
  
          return self.playlist_result(url_results, playlist_id, title)
  
  
          return self.playlist_result(url_results, playlist_id, title)
  
-    def _real_extract(self, url):
-        # Extract playlist id
-        mobj = re.match(self._VALID_URL, url)
-        if mobj is None:
-            raise ExtractorError(u'Invalid URL: %s' % url)
-        playlist_id = mobj.group(1) or mobj.group(2)
-
-        # Check if it's a video-specific URL
-        query_dict = compat_urlparse.parse_qs(compat_urlparse.urlparse(url).query)
-        if 'v' in query_dict:
-            video_id = query_dict['v'][0]
-            if self._downloader.params.get('noplaylist'):
-                self.to_screen(u'Downloading just video %s because of --no-playlist' % video_id)
-                return self.url_result(video_id, 'Youtube', video_id=video_id)
-            else:
-                self.to_screen(u'Downloading playlist %s - add --no-playlist to just download video %s' % (playlist_id, video_id))
-
-        if playlist_id.startswith('RD'):
-            # Mixes require a custom extraction process
-            return self._extract_mix(playlist_id)
-        if playlist_id.startswith('TL'):
-            raise ExtractorError(u'For downloading YouTube.com top lists, use '
-                u'the "yttoplist" keyword, for example "youtube-dl \'yttoplist:music:Top Tracks\'"', expected=True)
-
+    def _extract_playlist(self, playlist_id):
          url = self._TEMPLATE_URL % playlist_id
          page = self._download_webpage(url, playlist_id)
          url = self._TEMPLATE_URL % playlist_id
          page = self._download_webpage(url, playlist_id)
-        more_widget_html = content_html = page
-
-        # Check if the playlist exists or is private
-        if re.search(r'<div class="yt-alert-message">[^<]*?(The|This) playlist (does not exist|is private)[^<]*?</div>', page) is not None:
-            raise ExtractorError(
-                u'The playlist doesn\'t exist or is private, use --username or '
-                '--netrc to access it.',
-                expected=True)
-
-        # Extract the video ids from the playlist pages
-        ids = []
-
-        for page_num in itertools.count(1):
-            matches = re.finditer(self._VIDEO_RE, content_html)
-            # We remove the duplicates and the link with index 0
-            # (it's not the first video of the playlist)
-            new_ids = orderedSet(m.group('id') for m in matches if m.group('index') != '0')
-            ids.extend(new_ids)
  
  
-            mobj = re.search(r'data-uix-load-more-href="/?(?P<more>[^"]+)"', more_widget_html)
-            if not mobj:
-                break
-
-            more = self._download_json(
-                'https://youtube.com/%s' % mobj.group('more'), playlist_id,
-                'Downloading page #%s' % page_num,
-                transform_source=uppercase_escape)
-            content_html = more['content_html']
-            more_widget_html = more['load_more_widget_html']
+        # the yt-alert-message now has tabindex attribute (see https://github.com/rg3/youtube-dl/issues/11604)
+        for match in re.findall(r'<div class="yt-alert-message"[^>]*>([^<]+)</div>', page):
+            match = match.strip()
+            # Check if the playlist exists or is private
+            mobj = re.match(r'[^<]*(?:The|This) playlist (?P<reason>does not exist|is private)[^<]*', match)
+            if mobj:
+                reason = mobj.group('reason')
+                message = 'This playlist %s' % reason
+                if 'private' in reason:
+                    message += ', use --username or --netrc to access it'
+                message += '.'
+                raise ExtractorError(message, expected=True)
+            elif re.match(r'[^<]*Invalid parameters[^<]*', match):
+                raise ExtractorError(
+                    'Invalid parameters. Maybe URL is incorrect.',
+                    expected=True)
+            elif re.match(r'[^<]*Choose your language[^<]*', match):
+                continue
+            else:
+                self.report_warning('Youtube gives an alert message: ' + match)
  
          playlist_title = self._html_search_regex(
  
          playlist_title = self._html_search_regex(
-            r'(?s)<h1 class="pl-header-title[^"]*">\s*(.*?)\s*</h1>',
-            page, u'title')
-
-        url_results = self._ids_to_results(ids)
-        return self.playlist_result(url_results, playlist_id, playlist_title)
+            r'(?s)<h1 class="pl-header-title[^"]*"[^>]*>\s*(.*?)\s*</h1>',
+            page, 'title', default=None)
+
+        _UPLOADER_BASE = r'class=["\']pl-header-details[^>]+>\s*<li>\s*<a[^>]+\bhref='
+        uploader = self._search_regex(
+            r'%s["\']/(?:user|channel)/[^>]+>([^<]+)' % _UPLOADER_BASE,
+            page, 'uploader', default=None)
+        mobj = re.search(
+            r'%s(["\'])(?P<path>/(?:user|channel)/(?P<uploader_id>.+?))\1' % _UPLOADER_BASE,
+            page)
+        if mobj:
+            uploader_id = mobj.group('uploader_id')
+            uploader_url = compat_urlparse.urljoin(url, mobj.group('path'))
+        else:
+            uploader_id = uploader_url = None
  
  
+        has_videos = True
  
  
-class YoutubeTopListIE(YoutubePlaylistIE):
-    IE_NAME = u'youtube:toplist'
-    IE_DESC = (u'YouTube.com top lists, "yttoplist:{channel}:{list title}"'
-        u' (Example: "yttoplist:music:Top Tracks")')
-    _VALID_URL = r'yttoplist:(?P<chann>.*?):(?P<title>.*?)$'
+        if not playlist_title:
+            try:
+                # Some playlist URLs don't actually serve a playlist (e.g.
+                # https://www.youtube.com/watch?v=FqZTN594JQw&list=PLMYEtVRpaqY00V9W81Cwmzp6N6vZqfUKD4)
+                next(self._entries(page, playlist_id))
+            except StopIteration:
+                has_videos = False
+
+        playlist = self.playlist_result(
+            self._entries(page, playlist_id), playlist_id, playlist_title)
+        playlist.update({
+            'uploader': uploader,
+            'uploader_id': uploader_id,
+            'uploader_url': uploader_url,
+        })
+
+        return has_videos, playlist
+
+    def _check_download_just_video(self, url, playlist_id):
+        # Check if it's a video-specific URL
+        query_dict = compat_urlparse.parse_qs(compat_urlparse.urlparse(url).query)
+        video_id = query_dict.get('v', [None])[0] or self._search_regex(
+            r'(?:(?:^|//)youtu\.be/|youtube\.com/embed/(?!videoseries))([0-9A-Za-z_-]{11})', url,
+            'video id', default=None)
+        if video_id:
+            if self._downloader.params.get('noplaylist'):
+                self.to_screen('Downloading just video %s because of --no-playlist' % video_id)
+                return video_id, self.url_result(video_id, 'Youtube', video_id=video_id)
+            else:
+                self.to_screen('Downloading playlist %s - add --no-playlist to just download video %s' % (playlist_id, video_id))
+                return video_id, None
+        return None, None
  
      def _real_extract(self, url):
  
      def _real_extract(self, url):
+        # Extract playlist id
          mobj = re.match(self._VALID_URL, url)
          mobj = re.match(self._VALID_URL, url)
-        channel = mobj.group('chann')
-        title = mobj.group('title')
-        query = compat_urllib_parse.urlencode({'title': title})
-        playlist_re = 'href="([^"]+?%s.*?)"' % re.escape(query)
-        channel_page = self._download_webpage('https://www.youtube.com/%s' % channel, title)
-        link = self._html_search_regex(playlist_re, channel_page, u'list')
-        url = compat_urlparse.urljoin('https://www.youtube.com/', link)
-        
-        video_re = r'data-index="\d+".*?data-video-id="([0-9A-Za-z_-]{11})"'
-        ids = []
-        # sometimes the webpage doesn't contain the videos
-        # retry until we get them
-        for i in itertools.count(0):
-            msg = u'Downloading Youtube mix'
-            if i > 0:
-                msg += ', retry #%d' % i
-            webpage = self._download_webpage(url, title, msg)
-            ids = orderedSet(re.findall(video_re, webpage))
-            if ids:
-                break
-        url_results = self._ids_to_results(ids)
-        return self.playlist_result(url_results, playlist_title=title)
+        if mobj is None:
+            raise ExtractorError('Invalid URL: %s' % url)
+        playlist_id = mobj.group(1) or mobj.group(2)
  
  
+        video_id, video = self._check_download_just_video(url, playlist_id)
+        if video:
+            return video
  
  
-class YoutubeChannelIE(InfoExtractor):
-    IE_DESC = u'YouTube.com channels'
-    _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
-    _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
-    _MORE_PAGES_URL = 'https://www.youtube.com/c4_browse_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
-    IE_NAME = u'youtube:channel'
+        if playlist_id.startswith(('RD', 'UL', 'PU')):
+            # Mixes require a custom extraction process
+            return self._extract_mix(playlist_id)
  
  
-    def extract_videos_from_page(self, page):
-        ids_in_page = []
-        for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
-            if mobj.group(1) not in ids_in_page:
-                ids_in_page.append(mobj.group(1))
-        return ids_in_page
+        has_videos, playlist = self._extract_playlist(playlist_id)
+        if has_videos or not video_id:
+            return playlist
+
+        # Some playlist URLs don't actually serve a playlist (see
+        # https://github.com/rg3/youtube-dl/issues/10537).
+        # Fallback to plain video extraction if there is a video id
+        # along with playlist id.
+        return self.url_result(video_id, 'Youtube', video_id=video_id)
+
+
+class YoutubeChannelIE(YoutubePlaylistBaseInfoExtractor):
+    IE_DESC = 'YouTube.com channels'
+    _VALID_URL = r'https?://(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/(?P<id>[0-9A-Za-z_-]+)'
+    _TEMPLATE_URL = 'https://www.youtube.com/channel/%s/videos'
+    _VIDEO_RE = r'(?:title="(?P<title>[^"]+)"[^>]+)?href="/watch\?v=(?P<id>[0-9A-Za-z_-]+)&?'
+    IE_NAME = 'youtube:channel'
+    _TESTS = [{
+        'note': 'paginated channel',
+        'url': 'https://www.youtube.com/channel/UCKfVa3S1e4PHvxWcwyMMg8w',
+        'playlist_mincount': 91,
+        'info_dict': {
+            'id': 'UUKfVa3S1e4PHvxWcwyMMg8w',
+            'title': 'Uploads from lex will',
+        }
+    }, {
+        'note': 'Age restricted channel',
+        # from https://www.youtube.com/user/DeusExOfficial
+        'url': 'https://www.youtube.com/channel/UCs0ifCMCm1icqRbqhUINa0w',
+        'playlist_mincount': 64,
+        'info_dict': {
+            'id': 'UUs0ifCMCm1icqRbqhUINa0w',
+            'title': 'Uploads from Deus Ex',
+        },
+    }]
  
  
-    def _real_extract(self, url):
-        # Extract channel id
-        mobj = re.match(self._VALID_URL, url)
-        if mobj is None:
-            raise ExtractorError(u'Invalid URL: %s' % url)
+    @classmethod
+    def suitable(cls, url):
+        return (False if YoutubePlaylistsIE.suitable(url) or YoutubeLiveIE.suitable(url)
+                else super(YoutubeChannelIE, cls).suitable(url))
+
+    def _build_template_url(self, url, channel_id):
+        return self._TEMPLATE_URL % channel_id
  
  
-        # Download channel page
-        channel_id = mobj.group(1)
-        video_ids = []
-        url = 'https://www.youtube.com/channel/%s/videos' % channel_id
-        channel_page = self._download_webpage(url, channel_id)
+    def _real_extract(self, url):
+        channel_id = self._match_id(url)
+
+        url = self._build_template_url(url, channel_id)
+
+        # Channel by page listing is restricted to 35 pages of 30 items, i.e. 1050 videos total (see #5778)
+        # Workaround by extracting as a playlist if managed to obtain channel playlist URL
+        # otherwise fallback on channel by page extraction
+        channel_page = self._download_webpage(
+            url + '?view=57', channel_id,
+            'Downloading channel page', fatal=False)
+        if channel_page is False:
+            channel_playlist_id = False
+        else:
+            channel_playlist_id = self._html_search_meta(
+                'channelId', channel_page, 'channel id', default=None)
+            if not channel_playlist_id:
+                channel_url = self._html_search_meta(
+                    ('al:ios:url', 'twitter:app:url:iphone', 'twitter:app:url:ipad'),
+                    channel_page, 'channel url', default=None)
+                if channel_url:
+                    channel_playlist_id = self._search_regex(
+                        r'vnd\.youtube://user/([0-9A-Za-z_-]+)',
+                        channel_url, 'channel id', default=None)
+        if channel_playlist_id and channel_playlist_id.startswith('UC'):
+            playlist_id = 'UU' + channel_playlist_id[2:]
+            return self.url_result(
+                compat_urlparse.urljoin(url, '/playlist?list=%s' % playlist_id), 'YoutubePlaylist')
+
+        channel_page = self._download_webpage(url, channel_id, 'Downloading page #1')
          autogenerated = re.search(r'''(?x)
                  class="[^"]*?(?:
                      channel-header-autogenerated-label|
          autogenerated = re.search(r'''(?x)
                  class="[^"]*?(?:
                      channel-header-autogenerated-label|
@@ -1552,287 +2430,425 @@ class YoutubeChannelIE(InfoExtractor):
          if autogenerated:
              # The videos are contained in a single page
              # the ajax pages can't be used, they are empty
          if autogenerated:
              # The videos are contained in a single page
              # the ajax pages can't be used, they are empty
-            video_ids = self.extract_videos_from_page(channel_page)
-        else:
-            # Download all channel pages using the json-based channel_ajax query
-            for pagenum in itertools.count(1):
-                url = self._MORE_PAGES_URL % (pagenum, channel_id)
-                page = self._download_json(
-                    url, channel_id, note=u'Downloading page #%s' % pagenum,
-                    transform_source=uppercase_escape)
-
-                ids_in_page = self.extract_videos_from_page(page['content_html'])
-                video_ids.extend(ids_in_page)
-    
-                if self._MORE_PAGES_INDICATOR not in page['load_more_widget_html']:
-                    break
-
-        self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
-
-        url_entries = [self.url_result(video_id, 'Youtube', video_id=video_id)
-                       for video_id in video_ids]
-        return self.playlist_result(url_entries, channel_id)
-
-
-class YoutubeUserIE(InfoExtractor):
-    IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
-    _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?(?!(?:attribution_link|watch|results)(?:$|[^a-z_A-Z0-9-])))|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
-    _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/users/%s'
-    _GDATA_PAGE_SIZE = 50
-    _GDATA_URL = 'https://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d&alt=json'
-    IE_NAME = u'youtube:user'
+            entries = [
+                self.url_result(
+                    video_id, 'Youtube', video_id=video_id,
+                    video_title=video_title)
+                for video_id, video_title in self.extract_videos_from_page(channel_page)]
+            return self.playlist_result(entries, channel_id)
+
+        try:
+            next(self._entries(channel_page, channel_id))
+        except StopIteration:
+            alert_message = self._html_search_regex(
+                r'(?s)<div[^>]+class=(["\']).*?\byt-alert-message\b.*?\1[^>]*>(?P<alert>[^<]+)</div>',
+                channel_page, 'alert', default=None, group='alert')
+            if alert_message:
+                raise ExtractorError('Youtube said: %s' % alert_message, expected=True)
+
+        return self.playlist_result(self._entries(channel_page, channel_id), channel_id)
+
+
+class YoutubeUserIE(YoutubeChannelIE):
+    IE_DESC = 'YouTube.com user videos (URL or "ytuser" keyword)'
+    _VALID_URL = r'(?:(?:https?://(?:\w+\.)?youtube\.com/(?:(?P<user>user|c)/)?(?!(?:attribution_link|watch|results|shared)(?:$|[^a-z_A-Z0-9-])))|ytuser:)(?!feed/)(?P<id>[A-Za-z0-9_-]+)'
+    _TEMPLATE_URL = 'https://www.youtube.com/%s/%s/videos'
+    IE_NAME = 'youtube:user'
+
+    _TESTS = [{
+        'url': 'https://www.youtube.com/user/TheLinuxFoundation',
+        'playlist_mincount': 320,
+        'info_dict': {
+            'id': 'UUfX55Sx5hEFjoC3cNs6mCUQ',
+            'title': 'Uploads from The Linux Foundation',
+        }
+    }, {
+        # Only available via https://www.youtube.com/c/12minuteathlete/videos
+        # but not https://www.youtube.com/user/12minuteathlete/videos
+        'url': 'https://www.youtube.com/c/12minuteathlete/videos',
+        'playlist_mincount': 249,
+        'info_dict': {
+            'id': 'UUVjM-zV6_opMDx7WYxnjZiQ',
+            'title': 'Uploads from 12 Minute Athlete',
+        }
+    }, {
+        'url': 'ytuser:phihag',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/c/gametrailers',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/gametrailers',
+        'only_matching': True,
+    }, {
+        # This channel is not available, geo restricted to JP
+        'url': 'https://www.youtube.com/user/kananishinoSMEJ/videos',
+        'only_matching': True,
+    }]
  
      @classmethod
      def suitable(cls, url):
          # Don't return True if the url can be extracted with other youtube
          # extractor, the regex would is too permissive and it would match.
  
      @classmethod
      def suitable(cls, url):
          # Don't return True if the url can be extracted with other youtube
          # extractor, the regex would is too permissive and it would match.
-        other_ies = iter(klass for (name, klass) in globals().items() if name.endswith('IE') and klass is not cls)
-        if any(ie.suitable(url) for ie in other_ies): return False
-        else: return super(YoutubeUserIE, cls).suitable(url)
+        other_yt_ies = iter(klass for (name, klass) in globals().items() if name.startswith('Youtube') and name.endswith('IE') and klass is not cls)
+        if any(ie.suitable(url) for ie in other_yt_ies):
+            return False
+        else:
+            return super(YoutubeUserIE, cls).suitable(url)
  
  
-    def _real_extract(self, url):
-        # Extract username
+    def _build_template_url(self, url, channel_id):
          mobj = re.match(self._VALID_URL, url)
          mobj = re.match(self._VALID_URL, url)
-        if mobj is None:
-            raise ExtractorError(u'Invalid URL: %s' % url)
-
-        username = mobj.group(1)
-
-        # Download video ids using YouTube Data API. Result size per
-        # query is limited (currently to 50 videos) so we need to query
-        # page by page until there are no video ids - it means we got
-        # all of them.
-
-        def download_page(pagenum):
-            start_index = pagenum * self._GDATA_PAGE_SIZE + 1
+        return self._TEMPLATE_URL % (mobj.group('user') or 'user', mobj.group('id'))
+
+
+class YoutubeLiveIE(YoutubeBaseInfoExtractor):
+    IE_DESC = 'YouTube.com live streams'
+    _VALID_URL = r'(?P<base_url>https?://(?:\w+\.)?youtube\.com/(?:(?:user|channel|c)/)?(?P<id>[^/]+))/live'
+    IE_NAME = 'youtube:live'
+
+    _TESTS = [{
+        'url': 'https://www.youtube.com/user/TheYoungTurks/live',
+        'info_dict': {
+            'id': 'a48o2S1cPoo',
+            'ext': 'mp4',
+            'title': 'The Young Turks - Live Main Show',
+            'uploader': 'The Young Turks',
+            'uploader_id': 'TheYoungTurks',
+            'uploader_url': r're:https?://(?:www\.)?youtube\.com/user/TheYoungTurks',
+            'upload_date': '20150715',
+            'license': 'Standard YouTube License',
+            'description': 'md5:438179573adcdff3c97ebb1ee632b891',
+            'categories': ['News & Politics'],
+            'tags': ['Cenk Uygur (TV Program Creator)', 'The Young Turks (Award-Winning Work)', 'Talk Show (TV Genre)'],
+            'like_count': int,
+            'dislike_count': int,
+        },
+        'params': {
+            'skip_download': True,
+        },
+    }, {
+        'url': 'https://www.youtube.com/channel/UC1yBKRuGpC1tSM73A0ZjYjQ/live',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/c/CommanderVideoHq/live',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/TheYoungTurks/live',
+        'only_matching': True,
+    }]
  
  
-            gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
-            page = self._download_webpage(
-                gdata_url, username,
-                u'Downloading video ids from %d to %d' % (
-                    start_index, start_index + self._GDATA_PAGE_SIZE))
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        channel_id = mobj.group('id')
+        base_url = mobj.group('base_url')
+        webpage = self._download_webpage(url, channel_id, fatal=False)
+        if webpage:
+            page_type = self._og_search_property(
+                'type', webpage, 'page type', default='')
+            video_id = self._html_search_meta(
+                'videoId', webpage, 'video id', default=None)
+            if page_type.startswith('video') and video_id and re.match(
+                    r'^[0-9A-Za-z_-]{11}$', video_id):
+                return self.url_result(video_id, YoutubeIE.ie_key())
+        return self.url_result(base_url)
+
+
+class YoutubePlaylistsIE(YoutubePlaylistsBaseInfoExtractor):
+    IE_DESC = 'YouTube.com user/channel playlists'
+    _VALID_URL = r'https?://(?:\w+\.)?youtube\.com/(?:user|channel)/(?P<id>[^/]+)/playlists'
+    IE_NAME = 'youtube:playlists'
+
+    _TESTS = [{
+        'url': 'https://www.youtube.com/user/ThirstForScience/playlists',
+        'playlist_mincount': 4,
+        'info_dict': {
+            'id': 'ThirstForScience',
+            'title': 'Thirst for Science',
+        },
+    }, {
+        # with "Load more" button
+        'url': 'https://www.youtube.com/user/igorkle1/playlists?view=1&sort=dd',
+        'playlist_mincount': 70,
+        'info_dict': {
+            'id': 'igorkle1',
+            'title': 'Игорь Клейнер',
+        },
+    }, {
+        'url': 'https://www.youtube.com/channel/UCiU1dHvZObB2iP6xkJ__Icw/playlists',
+        'playlist_mincount': 17,
+        'info_dict': {
+            'id': 'UCiU1dHvZObB2iP6xkJ__Icw',
+            'title': 'Chem Player',
+        },
+    }]
  
  
-            try:
-                response = json.loads(page)
-            except ValueError as err:
-                raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
-            if 'entry' not in response['feed']:
-                return
-
-            # Extract video identifiers
-            entries = response['feed']['entry']
-            for entry in entries:
-                title = entry['title']['$t']
-                video_id = entry['id']['$t'].split('/')[-1]
-                yield {
-                    '_type': 'url',
-                    'url': video_id,
-                    'ie_key': 'Youtube',
-                    'id': video_id,
-                    'title': title,
-                }
-        url_results = PagedList(download_page, self._GDATA_PAGE_SIZE)
  
  
-        return self.playlist_result(url_results, playlist_title=username)
+class YoutubeSearchBaseInfoExtractor(YoutubePlaylistBaseInfoExtractor):
+    _VIDEO_RE = r'href="\s*/watch\?v=(?P<id>[0-9A-Za-z_-]{11})(?:[^"]*"[^>]+\btitle="(?P<title>[^"]+))?'
  
  
  
  
-class YoutubeSearchIE(SearchInfoExtractor):
-    IE_DESC = u'YouTube.com searches'
-    _API_URL = u'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
-    _MAX_RESULTS = 1000
-    IE_NAME = u'youtube:search'
+class YoutubeSearchIE(SearchInfoExtractor, YoutubeSearchBaseInfoExtractor):
+    IE_DESC = 'YouTube.com searches'
+    # there doesn't appear to be a real limit, for example if you search for
+    # 'python' you get more than 8.000.000 results
+    _MAX_RESULTS = float('inf')
+    IE_NAME = 'youtube:search'
      _SEARCH_KEY = 'ytsearch'
      _SEARCH_KEY = 'ytsearch'
+    _EXTRA_QUERY_ARGS = {}
+    _TESTS = []
  
      def _get_n_results(self, query, n):
          """Get a specified number of results for a query"""
  
  
      def _get_n_results(self, query, n):
          """Get a specified number of results for a query"""
  
-        video_ids = []
-        pagenum = 0
+        videos = []
          limit = n
          limit = n
-        PAGE_SIZE = 50
-
-        while (PAGE_SIZE * pagenum) < limit:
-            result_url = self._API_URL % (
-                compat_urllib_parse.quote_plus(query.encode('utf-8')),
-                (PAGE_SIZE * pagenum) + 1)
-            data_json = self._download_webpage(
-                result_url, video_id=u'query "%s"' % query,
-                note=u'Downloading page %s' % (pagenum + 1),
-                errnote=u'Unable to download API page')
-            data = json.loads(data_json)
-            api_response = data['data']
-
-            if 'items' not in api_response:
-                raise ExtractorError(
-                    u'[youtube] No video results', expected=True)
  
  
-            new_ids = list(video['id'] for video in api_response['items'])
-            video_ids += new_ids
+        url_query = {
+            'search_query': query.encode('utf-8'),
+        }
+        url_query.update(self._EXTRA_QUERY_ARGS)
+        result_url = 'https://www.youtube.com/results?' + compat_urllib_parse_urlencode(url_query)
+
+        for pagenum in itertools.count(1):
+            data = self._download_json(
+                result_url, video_id='query "%s"' % query,
+                note='Downloading page %s' % pagenum,
+                errnote='Unable to download API page',
+                query={'spf': 'navigate'})
+            html_content = data[1]['body']['content']
+
+            if 'class="search-message' in html_content:
+                raise ExtractorError(
+                    '[youtube] No video results', expected=True)
  
  
-            limit = min(n, api_response['totalItems'])
-            pagenum += 1
+            new_videos = list(self._process_page(html_content))
+            videos += new_videos
+            if not new_videos or len(videos) > limit:
+                break
+            next_link = self._html_search_regex(
+                r'href="(/results\?[^"]*\bsp=[^"]+)"[^>]*>\s*<span[^>]+class="[^"]*\byt-uix-button-content\b[^"]*"[^>]*>Next',
+                html_content, 'next link', default=None)
+            if next_link is None:
+                break
+            result_url = compat_urlparse.urljoin('https://www.youtube.com/', next_link)
  
  
-        if len(video_ids) > n:
-            video_ids = video_ids[:n]
-        videos = [self.url_result(video_id, 'Youtube', video_id=video_id)
-                  for video_id in video_ids]
+        if len(videos) > n:
+            videos = videos[:n]
          return self.playlist_result(videos, query)
  
  
  class YoutubeSearchDateIE(YoutubeSearchIE):
      IE_NAME = YoutubeSearchIE.IE_NAME + ':date'
          return self.playlist_result(videos, query)
  
  
  class YoutubeSearchDateIE(YoutubeSearchIE):
      IE_NAME = YoutubeSearchIE.IE_NAME + ':date'
-    _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc&orderby=published'
      _SEARCH_KEY = 'ytsearchdate'
      _SEARCH_KEY = 'ytsearchdate'
-    IE_DESC = u'YouTube.com searches, newest videos first'
-
-
-class YoutubeSearchURLIE(InfoExtractor):
-    IE_DESC = u'YouTube.com search URLs'
-    IE_NAME = u'youtube:search_url'
-    _VALID_URL = r'https?://(?:www\.)?youtube\.com/results\?(.*?&)?search_query=(?P<query>[^&]+)(?:[&]|$)'
+    IE_DESC = 'YouTube.com searches, newest videos first'
+    _EXTRA_QUERY_ARGS = {'search_sort': 'video_date_uploaded'}
+
+
+class YoutubeSearchURLIE(YoutubeSearchBaseInfoExtractor):
+    IE_DESC = 'YouTube.com search URLs'
+    IE_NAME = 'youtube:search_url'
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/results\?(.*?&)?(?:search_query|q)=(?P<query>[^&]+)(?:[&]|$)'
+    _TESTS = [{
+        'url': 'https://www.youtube.com/results?baz=bar&search_query=youtube-dl+test+video&filters=video&lclk=video',
+        'playlist_mincount': 5,
+        'info_dict': {
+            'title': 'youtube-dl test video',
+        }
+    }, {
+        'url': 'https://www.youtube.com/results?q=test&sp=EgQIBBgB',
+        'only_matching': True,
+    }]
  
      def _real_extract(self, url):
          mobj = re.match(self._VALID_URL, url)
  
      def _real_extract(self, url):
          mobj = re.match(self._VALID_URL, url)
-        query = compat_urllib_parse.unquote_plus(mobj.group('query'))
-
+        query = compat_urllib_parse_unquote_plus(mobj.group('query'))
          webpage = self._download_webpage(url, query)
          webpage = self._download_webpage(url, query)
-        result_code = self._search_regex(
-            r'(?s)<ol id="search-results"(.*?)</ol>', webpage, u'result HTML')
-
-        part_codes = re.findall(
-            r'(?s)<h3 class="yt-lockup-title">(.*?)</h3>', result_code)
-        entries = []
-        for part_code in part_codes:
-            part_title = self._html_search_regex(
-                r'(?s)title="([^"]+)"', part_code, 'item title', fatal=False)
-            part_url_snippet = self._html_search_regex(
-                r'(?s)href="([^"]+)"', part_code, 'item URL')
-            part_url = compat_urlparse.urljoin(
-                'https://www.youtube.com/', part_url_snippet)
-            entries.append({
-                '_type': 'url',
-                'url': part_url,
-                'title': part_title,
-            })
-
-        return {
-            '_type': 'playlist',
-            'entries': entries,
-            'title': query,
+        return self.playlist_result(self._process_page(webpage), playlist_title=query)
+
+
+class YoutubeShowIE(YoutubePlaylistsBaseInfoExtractor):
+    IE_DESC = 'YouTube.com (multi-season) shows'
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/show/(?P<id>[^?#]*)'
+    IE_NAME = 'youtube:show'
+    _TESTS = [{
+        'url': 'https://www.youtube.com/show/airdisasters',
+        'playlist_mincount': 5,
+        'info_dict': {
+            'id': 'airdisasters',
+            'title': 'Air Disasters',
          }
          }
-
-
-class YoutubeShowIE(InfoExtractor):
-    IE_DESC = u'YouTube.com (multi-season) shows'
-    _VALID_URL = r'https?://www\.youtube\.com/show/(.*)'
-    IE_NAME = u'youtube:show'
+    }]
  
      def _real_extract(self, url):
  
      def _real_extract(self, url):
-        mobj = re.match(self._VALID_URL, url)
-        show_name = mobj.group(1)
-        webpage = self._download_webpage(url, show_name, u'Downloading show webpage')
-        # There's one playlist for each season of the show
-        m_seasons = list(re.finditer(r'href="(/playlist\?list=.*?)"', webpage))
-        self.to_screen(u'%s: Found %s seasons' % (show_name, len(m_seasons)))
-        return [self.url_result('https://www.youtube.com' + season.group(1), 'YoutubePlaylist') for season in m_seasons]
+        playlist_id = self._match_id(url)
+        return super(YoutubeShowIE, self)._real_extract(
+            'https://www.youtube.com/show/%s/playlists' % playlist_id)
  
  
  class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
      """
  
  
  class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
      """
-    Base class for extractors that fetch info from
-    http://www.youtube.com/feed_ajax
+    Base class for feed extractors
      Subclasses must define the _FEED_NAME and _PLAYLIST_TITLE properties.
      """
      _LOGIN_REQUIRED = True
      Subclasses must define the _FEED_NAME and _PLAYLIST_TITLE properties.
      """
      _LOGIN_REQUIRED = True
-    # use action_load_personal_feed instead of action_load_system_feed
-    _PERSONAL_FEED = False
-
-    @property
-    def _FEED_TEMPLATE(self):
-        action = 'action_load_system_feed'
-        if self._PERSONAL_FEED:
-            action = 'action_load_personal_feed'
-        return 'https://www.youtube.com/feed_ajax?%s=1&feed_name=%s&paging=%%s' % (action, self._FEED_NAME)
  
      @property
      def IE_NAME(self):
  
      @property
      def IE_NAME(self):
-        return u'youtube:%s' % self._FEED_NAME
+        return 'youtube:%s' % self._FEED_NAME
  
      def _real_initialize(self):
          self._login()
  
      def _real_extract(self, url):
  
      def _real_initialize(self):
          self._login()
  
      def _real_extract(self, url):
-        feed_entries = []
-        paging = 0
-        for i in itertools.count(1):
-            info = self._download_json(self._FEED_TEMPLATE % paging,
-                                          u'%s feed' % self._FEED_NAME,
-                                          u'Downloading page %s' % i)
-            feed_html = info.get('feed_html') or info.get('content_html')
-            m_ids = re.finditer(r'"/watch\?v=(.*?)["&]', feed_html)
-            ids = orderedSet(m.group(1) for m in m_ids)
-            feed_entries.extend(
-                self.url_result(video_id, 'Youtube', video_id=video_id)
-                for video_id in ids)
-            mobj = re.search(
-                r'data-uix-load-more-href="/?[^"]+paging=(?P<paging>\d+)',
-                feed_html)
-            if mobj is None:
+        page = self._download_webpage(
+            'https://www.youtube.com/feed/%s' % self._FEED_NAME, self._PLAYLIST_TITLE)
+
+        # The extraction process is the same as for playlists, but the regex
+        # for the video ids doesn't contain an index
+        ids = []
+        more_widget_html = content_html = page
+        for page_num in itertools.count(1):
+            matches = re.findall(r'href="\s*/watch\?v=([0-9A-Za-z_-]{11})', content_html)
+
+            # 'recommended' feed has infinite 'load more' and each new portion spins
+            # the same videos in (sometimes) slightly different order, so we'll check
+            # for unicity and break when portion has no new videos
+            new_ids = filter(lambda video_id: video_id not in ids, orderedSet(matches))
+            if not new_ids:
                  break
                  break
-            paging = mobj.group('paging')
-        return self.playlist_result(feed_entries, playlist_title=self._PLAYLIST_TITLE)
  
  
-class YoutubeSubscriptionsIE(YoutubeFeedsInfoExtractor):
-    IE_DESC = u'YouTube.com subscriptions feed, "ytsubs" keyword (requires authentication)'
-    _VALID_URL = r'https?://www\.youtube\.com/feed/subscriptions|:ytsubs(?:criptions)?'
-    _FEED_NAME = 'subscriptions'
-    _PLAYLIST_TITLE = u'Youtube Subscriptions'
+            ids.extend(new_ids)
  
  
-class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
-    IE_DESC = u'YouTube.com recommended videos, "ytrec" keyword (requires authentication)'
-    _VALID_URL = r'https?://www\.youtube\.com/feed/recommended|:ytrec(?:ommended)?'
-    _FEED_NAME = 'recommended'
-    _PLAYLIST_TITLE = u'Youtube Recommended videos'
+            mobj = re.search(r'data-uix-load-more-href="/?(?P<more>[^"]+)"', more_widget_html)
+            if not mobj:
+                break
  
  
-class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
-    IE_DESC = u'Youtube watch later list, "ytwatchlater" keyword (requires authentication)'
-    _VALID_URL = r'https?://www\.youtube\.com/feed/watch_later|:ytwatchlater'
-    _FEED_NAME = 'watch_later'
-    _PLAYLIST_TITLE = u'Youtube Watch Later'
-    _PERSONAL_FEED = True
+            more = self._download_json(
+                'https://youtube.com/%s' % mobj.group('more'), self._PLAYLIST_TITLE,
+                'Downloading page #%s' % page_num,
+                transform_source=uppercase_escape)
+            content_html = more['content_html']
+            more_widget_html = more['load_more_widget_html']
+
+        return self.playlist_result(
+            self._ids_to_results(ids), playlist_title=self._PLAYLIST_TITLE)
+
+
+class YoutubeWatchLaterIE(YoutubePlaylistIE):
+    IE_NAME = 'youtube:watchlater'
+    IE_DESC = 'Youtube watch later list, ":ytwatchlater" for short (requires authentication)'
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/(?:feed/watch_later|(?:playlist|watch)\?(?:.+&)?list=WL)|:ytwatchlater'
+
+    _TESTS = [{
+        'url': 'https://www.youtube.com/playlist?list=WL',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/watch?v=bCNU9TrbiRk&index=1&list=WL',
+        'only_matching': True,
+    }]
+
+    def _real_extract(self, url):
+        _, video = self._check_download_just_video(url, 'WL')
+        if video:
+            return video
+        _, playlist = self._extract_playlist('WL')
+        return playlist
  
  
-class YoutubeHistoryIE(YoutubeFeedsInfoExtractor):
-    IE_DESC = u'Youtube watch history, "ythistory" keyword (requires authentication)'
-    _VALID_URL = u'https?://www\.youtube\.com/feed/history|:ythistory'
-    _FEED_NAME = 'history'
-    _PERSONAL_FEED = True
-    _PLAYLIST_TITLE = u'Youtube Watch History'
  
  class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
  
  class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
-    IE_NAME = u'youtube:favorites'
-    IE_DESC = u'YouTube.com favourite videos, "ytfav" keyword (requires authentication)'
-    _VALID_URL = r'https?://www\.youtube\.com/my_favorites|:ytfav(?:ou?rites)?'
+    IE_NAME = 'youtube:favorites'
+    IE_DESC = 'YouTube.com favourite videos, ":ytfav" for short (requires authentication)'
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/my_favorites|:ytfav(?:ou?rites)?'
      _LOGIN_REQUIRED = True
  
      def _real_extract(self, url):
          webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
      _LOGIN_REQUIRED = True
  
      def _real_extract(self, url):
          webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
-        playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, u'favourites playlist id')
+        playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, 'favourites playlist id')
          return self.url_result(playlist_id, 'YoutubePlaylist')
  
  
          return self.url_result(playlist_id, 'YoutubePlaylist')
  
  
+class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
+    IE_DESC = 'YouTube.com recommended videos, ":ytrec" for short (requires authentication)'
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/feed/recommended|:ytrec(?:ommended)?'
+    _FEED_NAME = 'recommended'
+    _PLAYLIST_TITLE = 'Youtube Recommended videos'
+
+
+class YoutubeSubscriptionsIE(YoutubeFeedsInfoExtractor):
+    IE_DESC = 'YouTube.com subscriptions feed, "ytsubs" keyword (requires authentication)'
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/feed/subscriptions|:ytsubs(?:criptions)?'
+    _FEED_NAME = 'subscriptions'
+    _PLAYLIST_TITLE = 'Youtube Subscriptions'
+
+
+class YoutubeHistoryIE(YoutubeFeedsInfoExtractor):
+    IE_DESC = 'Youtube watch history, ":ythistory" for short (requires authentication)'
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/feed/history|:ythistory'
+    _FEED_NAME = 'history'
+    _PLAYLIST_TITLE = 'Youtube History'
+
+
  class YoutubeTruncatedURLIE(InfoExtractor):
      IE_NAME = 'youtube:truncated_url'
      IE_DESC = False  # Do not list
      _VALID_URL = r'''(?x)
  class YoutubeTruncatedURLIE(InfoExtractor):
      IE_NAME = 'youtube:truncated_url'
      IE_DESC = False  # Do not list
      _VALID_URL = r'''(?x)
-        (?:https?://)?[^/]+/watch\?(?:feature=[a-z_]+)?$|
-        (?:https?://)?(?:www\.)?youtube\.com/attribution_link\?a=[^&]+$
+        (?:https?://)?
+        (?:\w+\.)?[yY][oO][uU][tT][uU][bB][eE](?:-nocookie)?\.com/
+        (?:watch\?(?:
+            feature=[a-z_]+|
+            annotation_id=annotation_[^&]+|
+            x-yt-cl=[0-9]+|
+            hl=[^&]*|
+            t=[0-9]+
+        )?
+        |
+            attribution_link\?a=[^&]+
+        )
+        $
      '''
  
      '''
  
+    _TESTS = [{
+        'url': 'https://www.youtube.com/watch?annotation_id=annotation_3951667041',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/watch?',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/watch?x-yt-cl=84503534',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/watch?feature=foo',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/watch?hl=en-GB',
+        'only_matching': True,
+    }, {
+        'url': 'https://www.youtube.com/watch?t=2372',
+        'only_matching': True,
+    }]
+
+    def _real_extract(self, url):
+        raise ExtractorError(
+            'Did you forget to quote the URL? Remember that & is a meta '
+            'character in most shells, so you want to put the URL in quotes, '
+            'like  youtube-dl '
+            '"https://www.youtube.com/watch?feature=foo&v=BaW_jenozKc" '
+            ' or simply  youtube-dl BaW_jenozKc  .',
+            expected=True)
+
+
+class YoutubeTruncatedIDIE(InfoExtractor):
+    IE_NAME = 'youtube:truncated_id'
+    IE_DESC = False  # Do not list
+    _VALID_URL = r'https?://(?:www\.)?youtube\.com/watch\?v=(?P<id>[0-9A-Za-z_-]{1,10})$'
+
+    _TESTS = [{
+        'url': 'https://www.youtube.com/watch?v=N_708QY7Ob',
+        'only_matching': True,
+    }]
+
      def _real_extract(self, url):
      def _real_extract(self, url):
+        video_id = self._match_id(url)
          raise ExtractorError(
          raise ExtractorError(
-            u'Did you forget to quote the URL? Remember that & is a meta '
-            u'character in most shells, so you want to put the URL in quotes, '
-            u'like  youtube-dl '
-            u'"http://www.youtube.com/watch?feature=foo&v=BaW_jenozKc" '
-            u' or simply  youtube-dl BaW_jenozKc  .',
+            'Incomplete YouTube ID %s. URL %s looks truncated.' % (video_id, url),
              expected=True)
              expected=True)