+                       player_url = None
+
+               # Get video info
+               self.report_video_info_webpage_download(video_id)
+               for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
+                       video_info_url = ('http://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
+                                          % (video_id, el_type))
+                       request = urllib2.Request(video_info_url, None, std_headers)
+                       try:
+                               video_info_webpage = urllib2.urlopen(request).read()
+                               video_info = parse_qs(video_info_webpage)
+                               if 'token' in video_info:
+                                       break
+                       except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                               self._downloader.trouble(u'ERROR: unable to download video info webpage: %s' % str(err))
+                               return
+               if 'token' not in video_info:
+                       if 'reason' in video_info:
+                               self._downloader.trouble(u'ERROR: YouTube said: %s' % video_info['reason'][0].decode('utf-8'))
+                       else:
+                               self._downloader.trouble(u'ERROR: "token" parameter not in video info for unknown reason')
+                       return
+
+               # Start extracting information
+               self.report_information_extraction(video_id)
+
+               # uploader
+               if 'author' not in video_info:
+                       self._downloader.trouble(u'ERROR: unable to extract uploader nickname')
+                       return
+               video_uploader = urllib.unquote_plus(video_info['author'][0])
+
+               # title
+               if 'title' not in video_info:
+                       self._downloader.trouble(u'ERROR: unable to extract video title')
+                       return
+               video_title = urllib.unquote_plus(video_info['title'][0])
+               video_title = video_title.decode('utf-8')
+               video_title = sanitize_title(video_title)
+
+               # simplified title
+               simple_title = re.sub(ur'(?u)([^%s]+)' % simple_title_chars, ur'_', video_title)
+               simple_title = simple_title.strip(ur'_')
+
+               # thumbnail image
+               if 'thumbnail_url' not in video_info:
+                       self._downloader.trouble(u'WARNING: unable to extract video thumbnail')
+                       video_thumbnail = ''
+               else:   # don't panic if we can't find it
+                       video_thumbnail = urllib.unquote_plus(video_info['thumbnail_url'][0])
+
+               # description
+               video_description = 'No description available.'
+               if self._downloader.params.get('forcedescription', False):
+                       mobj = re.search(r'<meta name="description" content="(.*)"(?:\s*/)?>', video_webpage)
+                       if mobj is not None:
+                               video_description = mobj.group(1)
+
+               # token
+               video_token = urllib.unquote_plus(video_info['token'][0])
+
+               # Decide which formats to download
+               requested_format = self._downloader.params.get('format', None)
+               get_video_template = 'http://www.youtube.com/get_video?video_id=%s&t=%s&eurl=&el=&ps=&asv=&fmt=%%s' % (video_id, video_token)
+
+               if 'fmt_url_map' in video_info:
+                       url_map = dict(tuple(pair.split('|')) for pair in video_info['fmt_url_map'][0].split(','))
+                       format_limit = self._downloader.params.get('format_limit', None)
+                       if format_limit is not None and format_limit in self._available_formats:
+                               format_list = self._available_formats[self._available_formats.index(format_limit):]
+                       else:
+                               format_list = self._available_formats
+                       existing_formats = [x for x in format_list if x in url_map]
+                       if len(existing_formats) == 0:
+                               self._downloader.trouble(u'ERROR: no known formats available for video')
+                               return
+                       if requested_format is None:
+                               video_url_list = [(existing_formats[0], get_video_template % existing_formats[0])] # Best quality
+                       elif requested_format == '-1':
+                               video_url_list = [(f, get_video_template % f) for f in existing_formats] # All formats
+                       else:
+                               video_url_list = [(requested_format, get_video_template % requested_format)] # Specific format
+
+               elif 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
+                       self.report_rtmp_download()
+                       video_url_list = [(None, video_info['conn'][0])]
+
+               else:
+                       self._downloader.trouble(u'ERROR: no fmt_url_map or conn information found in video info')
+                       return
+
+               for format_param, video_real_url in video_url_list:
+                       # At this point we have a new video
+                       self._downloader.increment_downloads()
+
+                       # Extension
+                       video_extension = self._video_extensions.get(format_param, 'flv')
+
+                       # Find the video URL in fmt_url_map or conn paramters
+                       try:
+                               # Process video information
+                               self._downloader.process_info({
+                                       'id':           video_id.decode('utf-8'),
+                                       'url':          video_real_url.decode('utf-8'),
+                                       'uploader':     video_uploader.decode('utf-8'),
+                                       'title':        video_title,
+                                       'stitle':       simple_title,
+                                       'ext':          video_extension.decode('utf-8'),
+                                       'format':       (format_param is None and u'NA' or format_param.decode('utf-8')),
+                                       'thumbnail':    video_thumbnail.decode('utf-8'),
+                                       'description':  video_description.decode('utf-8'),
+                                       'player_url':   player_url,
+                               })
+                       except UnavailableVideoError, err:
+                               self._downloader.trouble(u'ERROR: unable to download video (format may not be available)')
+
+
+class MetacafeIE(InfoExtractor):
+       """Information Extractor for metacafe.com."""
+
+       _VALID_URL = r'(?:http://)?(?:www\.)?metacafe\.com/watch/([^/]+)/([^/]+)/.*'
+       _DISCLAIMER = 'http://www.metacafe.com/family_filter/'
+       _FILTER_POST = 'http://www.metacafe.com/f/index.php?inputType=filter&controllerGroup=user'
+       _youtube_ie = None
+
+       def __init__(self, youtube_ie, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+               self._youtube_ie = youtube_ie
+
+       @staticmethod
+       def suitable(url):
+               return (re.match(MetacafeIE._VALID_URL, url) is not None)
+
+       def report_disclaimer(self):
+               """Report disclaimer retrieval."""
+               self._downloader.to_stdout(u'[metacafe] Retrieving disclaimer')
+
+       def report_age_confirmation(self):
+               """Report attempt to confirm age."""
+               self._downloader.to_stdout(u'[metacafe] Confirming age')
+       
+       def report_download_webpage(self, video_id):
+               """Report webpage download."""
+               self._downloader.to_stdout(u'[metacafe] %s: Downloading webpage' % video_id)
+       
+       def report_extraction(self, video_id):
+               """Report information extraction."""
+               self._downloader.to_stdout(u'[metacafe] %s: Extracting information' % video_id)
+
+       def _real_initialize(self):
+               # Retrieve disclaimer
+               request = urllib2.Request(self._DISCLAIMER, None, std_headers)
+               try:
+                       self.report_disclaimer()
+                       disclaimer = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: unable to retrieve disclaimer: %s' % str(err))
+                       return
+
+               # Confirm age
+               disclaimer_form = {
+                       'filters': '0',
+                       'submit': "Continue - I'm over 18",
+                       }
+               request = urllib2.Request(self._FILTER_POST, urllib.urlencode(disclaimer_form), std_headers)
+               try:
+                       self.report_age_confirmation()
+                       disclaimer = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: unable to confirm age: %s' % str(err))
+                       return
+       
+       def _real_extract(self, url):
+               # Extract id and simplified title from URL
+               mobj = re.match(self._VALID_URL, url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: invalid URL: %s' % url)
+                       return
+
+               video_id = mobj.group(1)
+
+               # Check if video comes from YouTube
+               mobj2 = re.match(r'^yt-(.*)$', video_id)
+               if mobj2 is not None:
+                       self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % mobj2.group(1))
+                       return
+
+               # At this point we have a new video
+               self._downloader.increment_downloads()
+
+               simple_title = mobj.group(2).decode('utf-8')
+
+               # Retrieve video webpage to extract further information
+               request = urllib2.Request('http://www.metacafe.com/watch/%s/' % video_id)
+               try:
+                       self.report_download_webpage(video_id)
+                       webpage = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: unable retrieve video webpage: %s' % str(err))
+                       return
+
+               # Extract URL, uploader and title from webpage
+               self.report_extraction(video_id)
+               mobj = re.search(r'(?m)&mediaURL=([^&]+)', webpage)
+               if mobj is not None:
+                       mediaURL = urllib.unquote(mobj.group(1))
+                       video_extension = mediaURL[-3:]
+                       
+                       # Extract gdaKey if available
+                       mobj = re.search(r'(?m)&gdaKey=(.*?)&', webpage)
+                       if mobj is None:
+                               video_url = mediaURL
+                       else:
+                               gdaKey = mobj.group(1)
+                               video_url = '%s?__gda__=%s' % (mediaURL, gdaKey)
+               else:
+                       mobj = re.search(r' name="flashvars" value="(.*?)"', webpage)
+                       if mobj is None:
+                               self._downloader.trouble(u'ERROR: unable to extract media URL')
+                               return
+                       vardict = parse_qs(mobj.group(1))
+                       if 'mediaData' not in vardict:
+                               self._downloader.trouble(u'ERROR: unable to extract media URL')
+                               return
+                       mobj = re.search(r'"mediaURL":"(http.*?)","key":"(.*?)"', vardict['mediaData'][0])
+                       if mobj is None:
+                               self._downloader.trouble(u'ERROR: unable to extract media URL')
+                               return
+                       mediaURL = mobj.group(1).replace('\\/', '/')
+                       video_extension = mediaURL[-3:]
+                       video_url = '%s?__gda__=%s' % (mediaURL, mobj.group(2))
+
+               mobj = re.search(r'(?im)<title>(.*) - Video</title>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract title')
+                       return
+               video_title = mobj.group(1).decode('utf-8')
+               video_title = sanitize_title(video_title)
+
+               mobj = re.search(r'(?ms)By:\s*<a .*?>(.+?)<', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract uploader nickname')
+                       return
+               video_uploader = mobj.group(1)
+
+               try:
+                       # Process video information
+                       self._downloader.process_info({
+                               'id':           video_id.decode('utf-8'),
+                               'url':          video_url.decode('utf-8'),
+                               'uploader':     video_uploader.decode('utf-8'),
+                               'title':        video_title,
+                               'stitle':       simple_title,
+                               'ext':          video_extension.decode('utf-8'),
+                               'format':       u'NA',
+                               'player_url':   None,
+                       })
+               except UnavailableVideoError:
+                       self._downloader.trouble(u'ERROR: unable to download video')
+
+
+class DailymotionIE(InfoExtractor):
+       """Information Extractor for Dailymotion"""
+
+       _VALID_URL = r'(?i)(?:https?://)?(?:www\.)?dailymotion\.[a-z]{2,3}/video/([^_/]+)_([^/]+)'
+
+       def __init__(self, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+
+       @staticmethod
+       def suitable(url):
+               return (re.match(DailymotionIE._VALID_URL, url) is not None)
+
+       def report_download_webpage(self, video_id):
+               """Report webpage download."""
+               self._downloader.to_stdout(u'[dailymotion] %s: Downloading webpage' % video_id)
+       
+       def report_extraction(self, video_id):
+               """Report information extraction."""
+               self._downloader.to_stdout(u'[dailymotion] %s: Extracting information' % video_id)
+
+       def _real_initialize(self):
+               return
+
+       def _real_extract(self, url):
+               # Extract id and simplified title from URL
+               mobj = re.match(self._VALID_URL, url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: invalid URL: %s' % url)
+                       return
+
+               # At this point we have a new video
+               self._downloader.increment_downloads()
+               video_id = mobj.group(1)
+
+               simple_title = mobj.group(2).decode('utf-8')
+               video_extension = 'flv'
+
+               # Retrieve video webpage to extract further information
+               request = urllib2.Request(url)
+               try:
+                       self.report_download_webpage(video_id)
+                       webpage = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: unable retrieve video webpage: %s' % str(err))
+                       return
+
+               # Extract URL, uploader and title from webpage
+               self.report_extraction(video_id)
+               mobj = re.search(r'(?i)addVariable\(\"video\"\s*,\s*\"([^\"]*)\"\)', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract media URL')
+                       return
+               mediaURL = urllib.unquote(mobj.group(1))
+
+               # if needed add http://www.dailymotion.com/ if relative URL
+
+               video_url = mediaURL
+
+               # '<meta\s+name="title"\s+content="Dailymotion\s*[:\-]\s*(.*?)"\s*\/\s*>'
+               mobj = re.search(r'(?im)<title>Dailymotion\s*[\-:]\s*(.+?)</title>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract title')
+                       return
+               video_title = mobj.group(1).decode('utf-8')
+               video_title = sanitize_title(video_title)
+
+               mobj = re.search(r'(?im)<div class="dmco_html owner">.*?<a class="name" href="/.+?">(.+?)</a>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract uploader nickname')
+                       return
+               video_uploader = mobj.group(1)
+
+               try:
+                       # Process video information
+                       self._downloader.process_info({
+                               'id':           video_id.decode('utf-8'),
+                               'url':          video_url.decode('utf-8'),
+                               'uploader':     video_uploader.decode('utf-8'),
+                               'title':        video_title,
+                               'stitle':       simple_title,
+                               'ext':          video_extension.decode('utf-8'),
+                               'format':       u'NA',
+                               'player_url':   None,
+                       })
+               except UnavailableVideoError:
+                       self._downloader.trouble(u'ERROR: unable to download video')
+
+class GoogleIE(InfoExtractor):
+       """Information extractor for video.google.com."""
+
+       _VALID_URL = r'(?:http://)?video\.google\.(?:com(?:\.au)?|co\.(?:uk|jp|kr|cr)|ca|de|es|fr|it|nl|pl)/videoplay\?docid=([^\&]+).*'
+
+       def __init__(self, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+
+       @staticmethod
+       def suitable(url):
+               return (re.match(GoogleIE._VALID_URL, url) is not None)
+
+       def report_download_webpage(self, video_id):
+               """Report webpage download."""
+               self._downloader.to_stdout(u'[video.google] %s: Downloading webpage' % video_id)
+
+       def report_extraction(self, video_id):
+               """Report information extraction."""
+               self._downloader.to_stdout(u'[video.google] %s: Extracting information' % video_id)
+
+       def _real_initialize(self):
+               return
+
+       def _real_extract(self, url):
+               # Extract id from URL
+               mobj = re.match(self._VALID_URL, url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: Invalid URL: %s' % url)
+                       return
+
+               # At this point we have a new video
+               self._downloader.increment_downloads()
+               video_id = mobj.group(1)
+
+               video_extension = 'mp4'
+
+               # Retrieve video webpage to extract further information
+               request = urllib2.Request('http://video.google.com/videoplay?docid=%s&hl=en&oe=utf-8' % video_id)
+               try:
+                       self.report_download_webpage(video_id)
+                       webpage = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: Unable to retrieve video webpage: %s' % str(err))
+                       return
+
+               # Extract URL, uploader, and title from webpage
+               self.report_extraction(video_id)
+               mobj = re.search(r"download_url:'([^']+)'", webpage)
+               if mobj is None:
+                       video_extension = 'flv'
+                       mobj = re.search(r"(?i)videoUrl\\x3d(.+?)\\x26", webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract media URL')
+                       return
+               mediaURL = urllib.unquote(mobj.group(1))
+               mediaURL = mediaURL.replace('\\x3d', '\x3d')
+               mediaURL = mediaURL.replace('\\x26', '\x26')
+
+               video_url = mediaURL
+
+               mobj = re.search(r'<title>(.*)</title>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract title')
+                       return
+               video_title = mobj.group(1).decode('utf-8')
+               video_title = sanitize_title(video_title)
+               simple_title = re.sub(ur'(?u)([^%s]+)' % simple_title_chars, ur'_', video_title)
+
+               # Extract video description
+               mobj = re.search(r'<span id=short-desc-content>([^<]*)</span>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract video description')
+                       return
+               video_description = mobj.group(1).decode('utf-8')
+               if not video_description:
+                       video_description = 'No description available.'
+
+               # Extract video thumbnail
+               if self._downloader.params.get('forcethumbnail', False):
+                       request = urllib2.Request('http://video.google.com/videosearch?q=%s+site:video.google.com&hl=en' % abs(int(video_id)))
+                       try:
+                               webpage = urllib2.urlopen(request).read()
+                       except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                               self._downloader.trouble(u'ERROR: Unable to retrieve video webpage: %s' % str(err))
+                               return
+                       mobj = re.search(r'<img class=thumbnail-img (?:.* )?src=(http.*)>', webpage)
+                       if mobj is None:
+                               self._downloader.trouble(u'ERROR: unable to extract video thumbnail')
+                               return
+                       video_thumbnail = mobj.group(1)
+               else:   # we need something to pass to process_info
+                       video_thumbnail = ''
+
+
+               try:
+                       # Process video information
+                       self._downloader.process_info({
+                               'id':           video_id.decode('utf-8'),
+                               'url':          video_url.decode('utf-8'),
+                               'uploader':     u'NA',
+                               'title':        video_title,
+                               'stitle':       simple_title,
+                               'ext':          video_extension.decode('utf-8'),
+                               'format':       u'NA',
+                               'player_url':   None,
+                       })
+               except UnavailableVideoError:
+                       self._downloader.trouble(u'ERROR: unable to download video')
+
+
+class PhotobucketIE(InfoExtractor):
+       """Information extractor for photobucket.com."""
+
+       _VALID_URL = r'(?:http://)?(?:[a-z0-9]+\.)?photobucket\.com/.*[\?\&]current=(.*\.flv)'
+
+       def __init__(self, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+
+       @staticmethod
+       def suitable(url):
+               return (re.match(PhotobucketIE._VALID_URL, url) is not None)
+
+       def report_download_webpage(self, video_id):
+               """Report webpage download."""
+               self._downloader.to_stdout(u'[photobucket] %s: Downloading webpage' % video_id)
+
+       def report_extraction(self, video_id):
+               """Report information extraction."""
+               self._downloader.to_stdout(u'[photobucket] %s: Extracting information' % video_id)
+
+       def _real_initialize(self):
+               return
+
+       def _real_extract(self, url):
+               # Extract id from URL
+               mobj = re.match(self._VALID_URL, url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: Invalid URL: %s' % url)
+                       return
+
+               # At this point we have a new video
+               self._downloader.increment_downloads()
+               video_id = mobj.group(1)
+
+               video_extension = 'flv'
+
+               # Retrieve video webpage to extract further information
+               request = urllib2.Request(url)
+               try:
+                       self.report_download_webpage(video_id)
+                       webpage = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: Unable to retrieve video webpage: %s' % str(err))
+                       return
+
+               # Extract URL, uploader, and title from webpage
+               self.report_extraction(video_id)
+               mobj = re.search(r'<link rel="video_src" href=".*\?file=([^"]+)" />', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract media URL')
+                       return
+               mediaURL = urllib.unquote(mobj.group(1))
+
+               video_url = mediaURL
+
+               mobj = re.search(r'<title>(.*) video by (.*) - Photobucket</title>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract title')
+                       return
+               video_title = mobj.group(1).decode('utf-8')
+               video_title = sanitize_title(video_title)
+               simple_title = re.sub(ur'(?u)([^%s]+)' % simple_title_chars, ur'_', video_title)
+
+               video_uploader = mobj.group(2).decode('utf-8')
+
+               try:
+                       # Process video information
+                       self._downloader.process_info({
+                               'id':           video_id.decode('utf-8'),
+                               'url':          video_url.decode('utf-8'),
+                               'uploader':     video_uploader,
+                               'title':        video_title,
+                               'stitle':       simple_title,
+                               'ext':          video_extension.decode('utf-8'),
+                               'format':       u'NA',
+                               'player_url':   None,
+                       })
+               except UnavailableVideoError:
+                       self._downloader.trouble(u'ERROR: unable to download video')
+
+
+class YahooIE(InfoExtractor):
+       """Information extractor for video.yahoo.com."""
+
+       # _VALID_URL matches all Yahoo! Video URLs
+       # _VPAGE_URL matches only the extractable '/watch/' URLs
+       _VALID_URL = r'(?:http://)?(?:[a-z]+\.)?video\.yahoo\.com/(?:watch|network)/([0-9]+)(?:/|\?v=)([0-9]+)(?:[#\?].*)?'
+       _VPAGE_URL = r'(?:http://)?video\.yahoo\.com/watch/([0-9]+)/([0-9]+)(?:[#\?].*)?'
+
+       def __init__(self, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+
+       @staticmethod
+       def suitable(url):
+               return (re.match(YahooIE._VALID_URL, url) is not None)
+
+       def report_download_webpage(self, video_id):
+               """Report webpage download."""
+               self._downloader.to_stdout(u'[video.yahoo] %s: Downloading webpage' % video_id)
+
+       def report_extraction(self, video_id):
+               """Report information extraction."""
+               self._downloader.to_stdout(u'[video.yahoo] %s: Extracting information' % video_id)
+
+       def _real_initialize(self):
+               return
+
+       def _real_extract(self, url, new_video=True):
+               # Extract ID from URL
+               mobj = re.match(self._VALID_URL, url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: Invalid URL: %s' % url)
+                       return
+
+               # At this point we have a new video
+               self._downloader.increment_downloads()
+               video_id = mobj.group(2)
+               video_extension = 'flv'
+
+               # Rewrite valid but non-extractable URLs as
+               # extractable English language /watch/ URLs
+               if re.match(self._VPAGE_URL, url) is None:
+                       request = urllib2.Request(url)
+                       try:
+                               webpage = urllib2.urlopen(request).read()
+                       except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                               self._downloader.trouble(u'ERROR: Unable to retrieve video webpage: %s' % str(err))
+                               return
+
+                       mobj = re.search(r'\("id", "([0-9]+)"\);', webpage)
+                       if mobj is None:
+                               self._downloader.trouble(u'ERROR: Unable to extract id field')
+                               return
+                       yahoo_id = mobj.group(1)
+
+                       mobj = re.search(r'\("vid", "([0-9]+)"\);', webpage)
+                       if mobj is None:
+                               self._downloader.trouble(u'ERROR: Unable to extract vid field')
+                               return
+                       yahoo_vid = mobj.group(1)
+
+                       url = 'http://video.yahoo.com/watch/%s/%s' % (yahoo_vid, yahoo_id)
+                       return self._real_extract(url, new_video=False)
+
+               # Retrieve video webpage to extract further information
+               request = urllib2.Request(url)
+               try:
+                       self.report_download_webpage(video_id)
+                       webpage = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: Unable to retrieve video webpage: %s' % str(err))
+                       return
+
+               # Extract uploader and title from webpage
+               self.report_extraction(video_id)
+               mobj = re.search(r'<meta name="title" content="(.*)" />', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract video title')
+                       return
+               video_title = mobj.group(1).decode('utf-8')
+               simple_title = re.sub(ur'(?u)([^%s]+)' % simple_title_chars, ur'_', video_title)
+
+               mobj = re.search(r'<h2 class="ti-5"><a href="http://video\.yahoo\.com/(people|profile)/[0-9]+" beacon=".*">(.*)</a></h2>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract video uploader')
+                       return
+               video_uploader = mobj.group(1).decode('utf-8')
+
+               # Extract video thumbnail
+               mobj = re.search(r'<link rel="image_src" href="(.*)" />', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract video thumbnail')
+                       return
+               video_thumbnail = mobj.group(1).decode('utf-8')
+
+               # Extract video description
+               mobj = re.search(r'<meta name="description" content="(.*)" />', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract video description')
+                       return
+               video_description = mobj.group(1).decode('utf-8')
+               if not video_description: video_description = 'No description available.'
+
+               # Extract video height and width
+               mobj = re.search(r'<meta name="video_height" content="([0-9]+)" />', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract video height')
+                       return
+               yv_video_height = mobj.group(1)
+
+               mobj = re.search(r'<meta name="video_width" content="([0-9]+)" />', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract video width')
+                       return
+               yv_video_width = mobj.group(1)
+
+               # Retrieve video playlist to extract media URL
+               # I'm not completely sure what all these options are, but we
+               # seem to need most of them, otherwise the server sends a 401.
+               yv_lg = 'R0xx6idZnW2zlrKP8xxAIR'  # not sure what this represents
+               yv_bitrate = '700'  # according to Wikipedia this is hard-coded
+               request = urllib2.Request('http://cosmos.bcst.yahoo.com/up/yep/process/getPlaylistFOP.php?node_id=' + video_id +
+                                         '&tech=flash&mode=playlist&lg=' + yv_lg + '&bitrate=' + yv_bitrate + '&vidH=' + yv_video_height +
+                                         '&vidW=' + yv_video_width + '&swf=as3&rd=video.yahoo.com&tk=null&adsupported=v1,v2,&eventid=1301797')
+               try:
+                       self.report_download_webpage(video_id)
+                       webpage = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: Unable to retrieve video webpage: %s' % str(err))
+                       return
+
+               # Extract media URL from playlist XML
+               mobj = re.search(r'<STREAM APP="(http://.*)" FULLPATH="/?(/.*\.flv\?[^"]*)"', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: Unable to extract media URL')
+                       return
+               video_url = urllib.unquote(mobj.group(1) + mobj.group(2)).decode('utf-8')
+               video_url = re.sub(r'(?u)&(.+?);', htmlentity_transform, video_url)
+
+               try:
+                       # Process video information
+                       self._downloader.process_info({
+                               'id':           video_id.decode('utf-8'),
+                               'url':          video_url,
+                               'uploader':     video_uploader,
+                               'title':        video_title,
+                               'stitle':       simple_title,
+                               'ext':          video_extension.decode('utf-8'),
+                               'thumbnail':    video_thumbnail.decode('utf-8'),
+                               'description':  video_description,
+                               'thumbnail':    video_thumbnail,
+                               'description':  video_description,
+                               'player_url':   None,
+                       })
+               except UnavailableVideoError:
+                       self._downloader.trouble(u'ERROR: unable to download video')
+
+
+class GenericIE(InfoExtractor):
+       """Generic last-resort information extractor."""
+
+       def __init__(self, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+
+       @staticmethod
+       def suitable(url):
+               return True
+
+       def report_download_webpage(self, video_id):
+               """Report webpage download."""
+               self._downloader.to_stdout(u'WARNING: Falling back on generic information extractor.')
+               self._downloader.to_stdout(u'[generic] %s: Downloading webpage' % video_id)
+
+       def report_extraction(self, video_id):
+               """Report information extraction."""
+               self._downloader.to_stdout(u'[generic] %s: Extracting information' % video_id)
+
+       def _real_initialize(self):
+               return
+
+       def _real_extract(self, url):
+               # At this point we have a new video
+               self._downloader.increment_downloads()
+
+               video_id = url.split('/')[-1]
+               request = urllib2.Request(url)
+               try:
+                       self.report_download_webpage(video_id)
+                       webpage = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: Unable to retrieve video webpage: %s' % str(err))
+                       return
+               except ValueError, err:
+                       # since this is the last-resort InfoExtractor, if
+                       # this error is thrown, it'll be thrown here
+                       self._downloader.trouble(u'ERROR: Invalid URL: %s' % url)
+                       return
+
+               # Start with something easy: JW Player in SWFObject
+               mobj = re.search(r'flashvars: [\'"](?:.*&)?file=(http[^\'"&]*)', webpage)
+               if mobj is None:
+                       # Broaden the search a little bit
+                       mobj = re.search(r'[^A-Za-z0-9]?(?:file|source)=(http[^\'"&]*)', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: Invalid URL: %s' % url)
+                       return
+
+               # It's possible that one of the regexes
+               # matched, but returned an empty group:
+               if mobj.group(1) is None:
+                       self._downloader.trouble(u'ERROR: Invalid URL: %s' % url)
+                       return
+
+               video_url = urllib.unquote(mobj.group(1))
+               video_id  = os.path.basename(video_url)
+
+               # here's a fun little line of code for you:
+               video_extension = os.path.splitext(video_id)[1][1:]
+               video_id        = os.path.splitext(video_id)[0]
+
+               # it's tempting to parse this further, but you would
+               # have to take into account all the variations like
+               #   Video Title - Site Name
+               #   Site Name | Video Title
+               #   Video Title - Tagline | Site Name
+               # and so on and so forth; it's just not practical
+               mobj = re.search(r'<title>(.*)</title>', webpage)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract title')
+                       return
+               video_title = mobj.group(1).decode('utf-8')
+               video_title = sanitize_title(video_title)
+               simple_title = re.sub(ur'(?u)([^%s]+)' % simple_title_chars, ur'_', video_title)
+
+               # video uploader is domain name
+               mobj = re.match(r'(?:https?://)?([^/]*)/.*', url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: unable to extract title')
+                       return
+               video_uploader = mobj.group(1).decode('utf-8')
+
+               try:
+                       # Process video information
+                       self._downloader.process_info({
+                               'id':           video_id.decode('utf-8'),
+                               'url':          video_url.decode('utf-8'),
+                               'uploader':     video_uploader,
+                               'title':        video_title,
+                               'stitle':       simple_title,
+                               'ext':          video_extension.decode('utf-8'),
+                               'format':       u'NA',
+                               'player_url':   None,
+                       })
+               except UnavailableVideoError, err:
+                       self._downloader.trouble(u'ERROR: unable to download video')
+
+
+class YoutubeSearchIE(InfoExtractor):
+       """Information Extractor for YouTube search queries."""
+       _VALID_QUERY = r'ytsearch(\d+|all)?:[\s\S]+'
+       _TEMPLATE_URL = 'http://www.youtube.com/results?search_query=%s&page=%s&gl=US&hl=en'
+       _VIDEO_INDICATOR = r'href="/watch\?v=.+?"'
+       _MORE_PAGES_INDICATOR = r'(?m)>\s*Next\s*</a>'
+       _youtube_ie = None
+       _max_youtube_results = 1000
+
+       def __init__(self, youtube_ie, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+               self._youtube_ie = youtube_ie
+       
+       @staticmethod
+       def suitable(url):
+               return (re.match(YoutubeSearchIE._VALID_QUERY, url) is not None)
+
+       def report_download_page(self, query, pagenum):
+               """Report attempt to download playlist page with given number."""
+               query = query.decode(preferredencoding())
+               self._downloader.to_stdout(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
+
+       def _real_initialize(self):
+               self._youtube_ie.initialize()
+       
+       def _real_extract(self, query):
+               mobj = re.match(self._VALID_QUERY, query)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: invalid search query "%s"' % query)
+                       return
+
+               prefix, query = query.split(':')
+               prefix = prefix[8:]
+               query  = query.encode('utf-8')
+               if prefix == '':
+                       self._download_n_results(query, 1)
+                       return
+               elif prefix == 'all':
+                       self._download_n_results(query, self._max_youtube_results)
+                       return
+               else:
+                       try:
+                               n = long(prefix)
+                               if n <= 0:
+                                       self._downloader.trouble(u'ERROR: invalid download number %s for query "%s"' % (n, query))
+                                       return
+                               elif n > self._max_youtube_results:
+                                       self._downloader.to_stderr(u'WARNING: ytsearch returns max %i results (you requested %i)'  % (self._max_youtube_results, n))
+                                       n = self._max_youtube_results
+                               self._download_n_results(query, n)
+                               return
+                       except ValueError: # parsing prefix as integer fails
+                               self._download_n_results(query, 1)
+                               return
+
+       def _download_n_results(self, query, n):
+               """Downloads a specified number of results for a query"""
+
+               video_ids = []
+               already_seen = set()
+               pagenum = 1
+
+               while True:
+                       self.report_download_page(query, pagenum)
+                       result_url = self._TEMPLATE_URL % (urllib.quote_plus(query), pagenum)
+                       request = urllib2.Request(result_url, None, std_headers)
+                       try:
+                               page = urllib2.urlopen(request).read()
+                       except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                               self._downloader.trouble(u'ERROR: unable to download webpage: %s' % str(err))
+                               return
+
+                       # Extract video identifiers
+                       for mobj in re.finditer(self._VIDEO_INDICATOR, page):
+                               video_id = page[mobj.span()[0]:mobj.span()[1]].split('=')[2][:-1]
+                               if video_id not in already_seen:
+                                       video_ids.append(video_id)
+                                       already_seen.add(video_id)
+                                       if len(video_ids) == n:
+                                               # Specified n videos reached
+                                               for id in video_ids:
+                                                       self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % id)
+                                               return
+
+                       if re.search(self._MORE_PAGES_INDICATOR, page) is None:
+                               for id in video_ids:
+                                       self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % id)
+                               return
+
+                       pagenum = pagenum + 1
+
+class GoogleSearchIE(InfoExtractor):
+       """Information Extractor for Google Video search queries."""
+       _VALID_QUERY = r'gvsearch(\d+|all)?:[\s\S]+'
+       _TEMPLATE_URL = 'http://video.google.com/videosearch?q=%s+site:video.google.com&start=%s&hl=en'
+       _VIDEO_INDICATOR = r'videoplay\?docid=([^\&>]+)\&'
+       _MORE_PAGES_INDICATOR = r'<span>Next</span>'
+       _google_ie = None
+       _max_google_results = 1000
+
+       def __init__(self, google_ie, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+               self._google_ie = google_ie
+       
+       @staticmethod
+       def suitable(url):
+               return (re.match(GoogleSearchIE._VALID_QUERY, url) is not None)
+
+       def report_download_page(self, query, pagenum):
+               """Report attempt to download playlist page with given number."""
+               query = query.decode(preferredencoding())
+               self._downloader.to_stdout(u'[video.google] query "%s": Downloading page %s' % (query, pagenum))
+
+       def _real_initialize(self):
+               self._google_ie.initialize()
+       
+       def _real_extract(self, query):
+               mobj = re.match(self._VALID_QUERY, query)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: invalid search query "%s"' % query)
+                       return
+
+               prefix, query = query.split(':')
+               prefix = prefix[8:]
+               query  = query.encode('utf-8')
+               if prefix == '':
+                       self._download_n_results(query, 1)
+                       return
+               elif prefix == 'all':
+                       self._download_n_results(query, self._max_google_results)
+                       return
+               else:
+                       try:
+                               n = long(prefix)
+                               if n <= 0:
+                                       self._downloader.trouble(u'ERROR: invalid download number %s for query "%s"' % (n, query))
+                                       return
+                               elif n > self._max_google_results:
+                                       self._downloader.to_stderr(u'WARNING: gvsearch returns max %i results (you requested %i)'  % (self._max_google_results, n))
+                                       n = self._max_google_results
+                               self._download_n_results(query, n)
+                               return
+                       except ValueError: # parsing prefix as integer fails
+                               self._download_n_results(query, 1)
+                               return
+
+       def _download_n_results(self, query, n):
+               """Downloads a specified number of results for a query"""
+
+               video_ids = []
+               already_seen = set()
+               pagenum = 1
+
+               while True:
+                       self.report_download_page(query, pagenum)
+                       result_url = self._TEMPLATE_URL % (urllib.quote_plus(query), pagenum)
+                       request = urllib2.Request(result_url, None, std_headers)
+                       try:
+                               page = urllib2.urlopen(request).read()
+                       except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                               self._downloader.trouble(u'ERROR: unable to download webpage: %s' % str(err))
+                               return
+
+                       # Extract video identifiers
+                       for mobj in re.finditer(self._VIDEO_INDICATOR, page):
+                               video_id = mobj.group(1)
+                               if video_id not in already_seen:
+                                       video_ids.append(video_id)
+                                       already_seen.add(video_id)
+                                       if len(video_ids) == n:
+                                               # Specified n videos reached
+                                               for id in video_ids:
+                                                       self._google_ie.extract('http://video.google.com/videoplay?docid=%s' % id)
+                                               return
+
+                       if re.search(self._MORE_PAGES_INDICATOR, page) is None:
+                               for id in video_ids:
+                                       self._google_ie.extract('http://video.google.com/videoplay?docid=%s' % id)
+                               return
+
+                       pagenum = pagenum + 1
+
+class YahooSearchIE(InfoExtractor):
+       """Information Extractor for Yahoo! Video search queries."""
+       _VALID_QUERY = r'yvsearch(\d+|all)?:[\s\S]+'
+       _TEMPLATE_URL = 'http://video.yahoo.com/search/?p=%s&o=%s'
+       _VIDEO_INDICATOR = r'href="http://video\.yahoo\.com/watch/([0-9]+/[0-9]+)"'
+       _MORE_PAGES_INDICATOR = r'\s*Next'
+       _yahoo_ie = None
+       _max_yahoo_results = 1000
+
+       def __init__(self, yahoo_ie, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+               self._yahoo_ie = yahoo_ie
+       
+       @staticmethod
+       def suitable(url):
+               return (re.match(YahooSearchIE._VALID_QUERY, url) is not None)
+
+       def report_download_page(self, query, pagenum):
+               """Report attempt to download playlist page with given number."""
+               query = query.decode(preferredencoding())
+               self._downloader.to_stdout(u'[video.yahoo] query "%s": Downloading page %s' % (query, pagenum))
+
+       def _real_initialize(self):
+               self._yahoo_ie.initialize()
+       
+       def _real_extract(self, query):
+               mobj = re.match(self._VALID_QUERY, query)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: invalid search query "%s"' % query)
+                       return
+
+               prefix, query = query.split(':')
+               prefix = prefix[8:]
+               query  = query.encode('utf-8')
+               if prefix == '':
+                       self._download_n_results(query, 1)
+                       return
+               elif prefix == 'all':
+                       self._download_n_results(query, self._max_yahoo_results)
+                       return
+               else:
+                       try:
+                               n = long(prefix)
+                               if n <= 0:
+                                       self._downloader.trouble(u'ERROR: invalid download number %s for query "%s"' % (n, query))
+                                       return
+                               elif n > self._max_yahoo_results:
+                                       self._downloader.to_stderr(u'WARNING: yvsearch returns max %i results (you requested %i)'  % (self._max_yahoo_results, n))
+                                       n = self._max_yahoo_results
+                               self._download_n_results(query, n)
+                               return
+                       except ValueError: # parsing prefix as integer fails
+                               self._download_n_results(query, 1)
+                               return
+
+       def _download_n_results(self, query, n):
+               """Downloads a specified number of results for a query"""
+
+               video_ids = []
+               already_seen = set()
+               pagenum = 1
+
+               while True:
+                       self.report_download_page(query, pagenum)
+                       result_url = self._TEMPLATE_URL % (urllib.quote_plus(query), pagenum)
+                       request = urllib2.Request(result_url, None, std_headers)
+                       try:
+                               page = urllib2.urlopen(request).read()
+                       except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                               self._downloader.trouble(u'ERROR: unable to download webpage: %s' % str(err))
+                               return
+
+                       # Extract video identifiers
+                       for mobj in re.finditer(self._VIDEO_INDICATOR, page):
+                               video_id = mobj.group(1)
+                               if video_id not in already_seen:
+                                       video_ids.append(video_id)
+                                       already_seen.add(video_id)
+                                       if len(video_ids) == n:
+                                               # Specified n videos reached
+                                               for id in video_ids:
+                                                       self._yahoo_ie.extract('http://video.yahoo.com/watch/%s' % id)
+                                               return
+
+                       if re.search(self._MORE_PAGES_INDICATOR, page) is None:
+                               for id in video_ids:
+                                       self._yahoo_ie.extract('http://video.yahoo.com/watch/%s' % id)
+                               return
+
+                       pagenum = pagenum + 1
+
+class YoutubePlaylistIE(InfoExtractor):
+       """Information Extractor for YouTube playlists."""
+
+       _VALID_URL = r'(?:http://)?(?:\w+\.)?youtube.com/(?:(?:view_play_list|my_playlists)\?.*?p=|user/.*?/user/)([^&]+).*'
+       _TEMPLATE_URL = 'http://www.youtube.com/view_play_list?p=%s&page=%s&gl=US&hl=en'
+       _VIDEO_INDICATOR = r'/watch\?v=(.+?)&'
+       _MORE_PAGES_INDICATOR = r'(?m)>\s*Next\s*</a>'
+       _youtube_ie = None
+
+       def __init__(self, youtube_ie, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+               self._youtube_ie = youtube_ie
+       
+       @staticmethod
+       def suitable(url):
+               return (re.match(YoutubePlaylistIE._VALID_URL, url) is not None)
+
+       def report_download_page(self, playlist_id, pagenum):
+               """Report attempt to download playlist page with given number."""
+               self._downloader.to_stdout(u'[youtube] PL %s: Downloading page #%s' % (playlist_id, pagenum))
+
+       def _real_initialize(self):
+               self._youtube_ie.initialize()
+       
+       def _real_extract(self, url):
+               # Extract playlist id
+               mobj = re.match(self._VALID_URL, url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: invalid url: %s' % url)
+                       return
+
+               # Download playlist pages
+               playlist_id = mobj.group(1)
+               video_ids = []
+               pagenum = 1
+
+               while True:
+                       self.report_download_page(playlist_id, pagenum)
+                       request = urllib2.Request(self._TEMPLATE_URL % (playlist_id, pagenum), None, std_headers)
+                       try:
+                               page = urllib2.urlopen(request).read()
+                       except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                               self._downloader.trouble(u'ERROR: unable to download webpage: %s' % str(err))
+                               return
+
+                       # Extract video identifiers
+                       ids_in_page = []
+                       for mobj in re.finditer(self._VIDEO_INDICATOR, page):
+                               if mobj.group(1) not in ids_in_page:
+                                       ids_in_page.append(mobj.group(1))
+                       video_ids.extend(ids_in_page)
+
+                       if re.search(self._MORE_PAGES_INDICATOR, page) is None:
+                               break
+                       pagenum = pagenum + 1
+
+               playliststart = self._downloader.params.get('playliststart', 1)
+               playliststart -= 1 #our arrays are zero-based but the playlist is 1-based
+               if playliststart > 0:
+                       video_ids = video_ids[playliststart:]
+                       
+               for id in video_ids:
+                       self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % id)
+               return
+
+class YoutubeUserIE(InfoExtractor):
+       """Information Extractor for YouTube users."""
+
+       _VALID_URL = r'(?:http://)?(?:\w+\.)?youtube.com/user/(.*)'
+       _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
+       _VIDEO_INDICATOR = r'http://gdata.youtube.com/feeds/api/videos/(.*)' # XXX Fix this.
+       _youtube_ie = None
+
+       def __init__(self, youtube_ie, downloader=None):
+               InfoExtractor.__init__(self, downloader)
+               self._youtube_ie = youtube_ie
+       
+       @staticmethod
+       def suitable(url):
+               return (re.match(YoutubeUserIE._VALID_URL, url) is not None)
+
+       def report_download_page(self, username):
+               """Report attempt to download user page."""
+               self._downloader.to_stdout(u'[youtube] user %s: Downloading page ' % (username))
+
+       def _real_initialize(self):
+               self._youtube_ie.initialize()
+       
+       def _real_extract(self, url):
+               # Extract username
+               mobj = re.match(self._VALID_URL, url)
+               if mobj is None:
+                       self._downloader.trouble(u'ERROR: invalid url: %s' % url)
+                       return
+
+               # Download user page
+               username = mobj.group(1)
+               video_ids = []
+               pagenum = 1
+
+               self.report_download_page(username)
+               request = urllib2.Request(self._TEMPLATE_URL % (username), None, std_headers)
+               try:
+                       page = urllib2.urlopen(request).read()
+               except (urllib2.URLError, httplib.HTTPException, socket.error), err:
+                       self._downloader.trouble(u'ERROR: unable to download webpage: %s' % str(err))
+                       return
+
+               # Extract video identifiers
+               ids_in_page = []
+
+               for mobj in re.finditer(self._VIDEO_INDICATOR, page):
+                       if mobj.group(1) not in ids_in_page:
+                               ids_in_page.append(mobj.group(1))
+               video_ids.extend(ids_in_page)
+
+               playliststart = self._downloader.params.get('playliststart', 1)
+               playliststart = playliststart-1 #our arrays are zero-based but the playlist is 1-based
+               if playliststart > 0:
+                       video_ids = video_ids[playliststart:]   
+
+               for id in video_ids:
+                       self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % id)
+               return
+
+class PostProcessor(object):
+       """Post Processor class.
+
+       PostProcessor objects can be added to downloaders with their
+       add_post_processor() method. When the downloader has finished a
+       successful download, it will take its internal chain of PostProcessors
+       and start calling the run() method on each one of them, first with
+       an initial argument and then with the returned value of the previous
+       PostProcessor.
+
+       The chain will be stopped if one of them ever returns None or the end
+       of the chain is reached.
+
+       PostProcessor objects follow a "mutual registration" process similar
+       to InfoExtractor objects.
+       """
+
+       _downloader = None
+
+       def __init__(self, downloader=None):
+               self._downloader = downloader
+
+       def set_downloader(self, downloader):
+               """Sets the downloader for this PP."""
+               self._downloader = downloader
+       
+       def run(self, information):
+               """Run the PostProcessor.
+
+               The "information" argument is a dictionary like the ones
+               composed by InfoExtractors. The only difference is that this
+               one has an extra field called "filepath" that points to the
+               downloaded file.
+
+               When this method returns None, the postprocessing chain is
+               stopped. However, this method may return an information
+               dictionary that will be passed to the next postprocessing
+               object in the chain. It can be the one it received after
+               changing some fields.
+
+               In addition, this method may raise a PostProcessingError
+               exception that will be taken into account by the downloader
+               it was called from.
+               """
+               return information # by default, do nothing
+       
+### MAIN PROGRAM ###
+if __name__ == '__main__':
+       try:
+               # Modules needed only when running the main program
+               import getpass
+               import optparse
+
+               # Function to update the program file with the latest version from bitbucket.org
+               def update_self(downloader, filename):
+                       # Note: downloader only used for options
+                       if not os.access (filename, os.W_OK):
+                               sys.exit('ERROR: no write permissions on %s' % filename)
+
+                       downloader.to_stdout('Updating to latest stable version...')
+                       latest_url = 'http://bitbucket.org/rg3/youtube-dl/raw/tip/LATEST_VERSION'
+                       latest_version = urllib.urlopen(latest_url).read().strip()
+                       prog_url = 'http://bitbucket.org/rg3/youtube-dl/raw/%s/youtube-dl' % latest_version
+                       newcontent = urllib.urlopen(prog_url).read()
+                       stream = open(filename, 'w')
+                       stream.write(newcontent)
+                       stream.close()
+                       downloader.to_stdout('Updated to version %s' % latest_version)
+
+               # General configuration
+               urllib2.install_opener(urllib2.build_opener(urllib2.ProxyHandler()))
+               urllib2.install_opener(urllib2.build_opener(urllib2.HTTPCookieProcessor()))
+               socket.setdefaulttimeout(300) # 5 minutes should be enough (famous last words)
+
+               # Parse command line
+               parser = optparse.OptionParser(
+                       usage='Usage: %prog [options] url...',
+                       version='2010.10.03',
+                       conflict_handler='resolve',
+               )
+
+               parser.add_option('-h', '--help',
+                               action='help', help='print this help text and exit')
+               parser.add_option('-v', '--version',
+                               action='version', help='print program version and exit')
+               parser.add_option('-U', '--update',
+                               action='store_true', dest='update_self', help='update this program to latest stable version')
+               parser.add_option('-i', '--ignore-errors',
+                               action='store_true', dest='ignoreerrors', help='continue on download errors', default=False)
+               parser.add_option('-r', '--rate-limit',
+                               dest='ratelimit', metavar='LIMIT', help='download rate limit (e.g. 50k or 44.6m)')
+               parser.add_option('-R', '--retries',
+                               dest='retries', metavar='RETRIES', help='number of retries (default is 10)', default=10)
+               parser.add_option('--playlist-start',
+                               dest='playliststart', metavar='NUMBER', help='playlist video to start at (default is 1)', default=1)
+
+               authentication = optparse.OptionGroup(parser, 'Authentication Options')
+               authentication.add_option('-u', '--username',
+                               dest='username', metavar='USERNAME', help='account username')
+               authentication.add_option('-p', '--password',
+                               dest='password', metavar='PASSWORD', help='account password')
+               authentication.add_option('-n', '--netrc',
+                               action='store_true', dest='usenetrc', help='use .netrc authentication data', default=False)
+               parser.add_option_group(authentication)
+
+               video_format = optparse.OptionGroup(parser, 'Video Format Options')
+               video_format.add_option('-f', '--format',
+                               action='store', dest='format', metavar='FORMAT', help='video format code')
+               video_format.add_option('-m', '--mobile-version',
+                               action='store_const', dest='format', help='alias for -f 17', const='17')
+               video_format.add_option('--all-formats',
+                               action='store_const', dest='format', help='download all available video formats', const='-1')
+               video_format.add_option('--max-quality',
+                               action='store', dest='format_limit', metavar='FORMAT', help='highest quality format to download')
+               video_format.add_option('-b', '--best-quality',
+                               action='store_true', dest='bestquality', help='download the best video quality (DEPRECATED)')
+               parser.add_option_group(video_format)
+
+               verbosity = optparse.OptionGroup(parser, 'Verbosity / Simulation Options')
+               verbosity.add_option('-q', '--quiet',
+                               action='store_true', dest='quiet', help='activates quiet mode', default=False)
+               verbosity.add_option('-s', '--simulate',
+                               action='store_true', dest='simulate', help='do not download video', default=False)
+               verbosity.add_option('-g', '--get-url',
+                               action='store_true', dest='geturl', help='simulate, quiet but print URL', default=False)
+               verbosity.add_option('-e', '--get-title',
+                               action='store_true', dest='gettitle', help='simulate, quiet but print title', default=False)
+               verbosity.add_option('--get-thumbnail',
+                               action='store_true', dest='getthumbnail', help='simulate, quiet but print thumbnail URL', default=False)
+               verbosity.add_option('--get-description',
+                               action='store_true', dest='getdescription', help='simulate, quiet but print video description', default=False)
+               verbosity.add_option('--no-progress',
+                               action='store_true', dest='noprogress', help='do not print progress bar', default=False)
+               parser.add_option_group(verbosity)
+
+               filesystem = optparse.OptionGroup(parser, 'Filesystem Options')
+               filesystem.add_option('-t', '--title',
+                               action='store_true', dest='usetitle', help='use title in file name', default=False)
+               filesystem.add_option('-l', '--literal',
+                               action='store_true', dest='useliteral', help='use literal title in file name', default=False)
+               filesystem.add_option('-o', '--output',
+                               dest='outtmpl', metavar='TEMPLATE', help='output filename template')
+               filesystem.add_option('-a', '--batch-file',
+                               dest='batchfile', metavar='FILE', help='file containing URLs to download (\'-\' for stdin)')
+               filesystem.add_option('-w', '--no-overwrites',
+                               action='store_true', dest='nooverwrites', help='do not overwrite files', default=False)
+               filesystem.add_option('-c', '--continue',
+                               action='store_true', dest='continue_dl', help='resume partially downloaded files', default=False)
+               parser.add_option_group(filesystem)
+
+               (opts, args) = parser.parse_args()
+
+               # Batch file verification
+               batchurls = []
+               if opts.batchfile is not None:
+                       try:
+                               if opts.batchfile == '-':
+                                       batchfd = sys.stdin
+                               else:
+                                       batchfd = open(opts.batchfile, 'r')
+                               batchurls = batchfd.readlines()
+                               batchurls = [x.strip() for x in batchurls]
+                               batchurls = [x for x in batchurls if len(x) > 0]
+                       except IOError:
+                               sys.exit(u'ERROR: batch file could not be read')
+               all_urls = batchurls + args
+
+               # Conflicting, missing and erroneous options
+               if opts.bestquality:
+                       print >>sys.stderr, u'\nWARNING: -b/--best-quality IS DEPRECATED AS IT IS THE DEFAULT BEHAVIOR NOW\n'
+               if opts.usenetrc and (opts.username is not None or opts.password is not None):
+                       parser.error(u'using .netrc conflicts with giving username/password')
+               if opts.password is not None and opts.username is None:
+                       parser.error(u'account username missing')
+               if opts.outtmpl is not None and (opts.useliteral or opts.usetitle):
+                       parser.error(u'using output template conflicts with using title or literal title')
+               if opts.usetitle and opts.useliteral:
+                       parser.error(u'using title conflicts with using literal title')
+               if opts.username is not None and opts.password is None:
+                       opts.password = getpass.getpass(u'Type account password and press return:')
+               if opts.ratelimit is not None:
+                       numeric_limit = FileDownloader.parse_bytes(opts.ratelimit)
+                       if numeric_limit is None:
+                               parser.error(u'invalid rate limit specified')
+                       opts.ratelimit = numeric_limit
+               if opts.retries is not None:
+                       try:
+                               opts.retries = long(opts.retries)
+                       except (TypeError, ValueError), err:
+                               parser.error(u'invalid retry count specified')
+               if opts.playliststart is not None:
+                       try:
+                               opts.playliststart = long(opts.playliststart)
+                       except (TypeError, ValueError), err:
+                               parser.error(u'invalid playlist page specified')
+
+               # Information extractors
+               youtube_ie = YoutubeIE()
+               metacafe_ie = MetacafeIE(youtube_ie)
+               dailymotion_ie = DailymotionIE()
+               youtube_pl_ie = YoutubePlaylistIE(youtube_ie)
+               youtube_user_ie = YoutubeUserIE(youtube_ie)
+               youtube_search_ie = YoutubeSearchIE(youtube_ie)
+               google_ie = GoogleIE()
+               google_search_ie = GoogleSearchIE(google_ie)
+               photobucket_ie = PhotobucketIE()
+               yahoo_ie = YahooIE()
+               yahoo_search_ie = YahooSearchIE(yahoo_ie)
+               generic_ie = GenericIE()
+
+               # File downloader
+               fd = FileDownloader({
+                       'usenetrc': opts.usenetrc,
+                       'username': opts.username,
+                       'password': opts.password,
+                       'quiet': (opts.quiet or opts.geturl or opts.gettitle or opts.getthumbnail or opts.getdescription),
+                       'forceurl': opts.geturl,
+                       'forcetitle': opts.gettitle,
+                       'forcethumbnail': opts.getthumbnail,
+                       'forcedescription': opts.getdescription,
+                       'simulate': (opts.simulate or opts.geturl or opts.gettitle or opts.getthumbnail or opts.getdescription),
+                       'format': opts.format,
+                       'format_limit': opts.format_limit,
+                       'outtmpl': ((opts.outtmpl is not None and opts.outtmpl.decode(preferredencoding()))
+                               or (opts.format == '-1' and opts.usetitle and u'%(stitle)s-%(id)s-%(format)s.%(ext)s')
+                               or (opts.format == '-1' and opts.useliteral and u'%(title)s-%(id)s-%(format)s.%(ext)s')
+                               or (opts.format == '-1' and u'%(id)s-%(format)s.%(ext)s')
+                               or (opts.usetitle and u'%(stitle)s-%(id)s.%(ext)s')
+                               or (opts.useliteral and u'%(title)s-%(id)s.%(ext)s')
+                               or u'%(id)s.%(ext)s'),
+                       'ignoreerrors': opts.ignoreerrors,
+                       'ratelimit': opts.ratelimit,
+                       'nooverwrites': opts.nooverwrites,
+                       'retries': opts.retries,
+                       'continuedl': opts.continue_dl,
+                       'noprogress': opts.noprogress,
+                       'playliststart': opts.playliststart,
+                       })
+               fd.add_info_extractor(youtube_search_ie)
+               fd.add_info_extractor(youtube_pl_ie)
+               fd.add_info_extractor(youtube_user_ie)
+               fd.add_info_extractor(metacafe_ie)
+               fd.add_info_extractor(dailymotion_ie)
+               fd.add_info_extractor(youtube_ie)
+               fd.add_info_extractor(google_ie)
+               fd.add_info_extractor(google_search_ie)
+               fd.add_info_extractor(photobucket_ie)
+               fd.add_info_extractor(yahoo_ie)
+               fd.add_info_extractor(yahoo_search_ie)
+
+               # This must come last since it's the
+               # fallback if none of the others work
+               fd.add_info_extractor(generic_ie)
+
+               # Update version
+               if opts.update_self:
+                       update_self(fd, sys.argv[0])
+
+               # Maybe do nothing
+               if len(all_urls) < 1:
+                       if not opts.update_self:
+                               parser.error(u'you must provide at least one URL')
+                       else:
+                               sys.exit()
+               retcode = fd.download(all_urls)
+               sys.exit(retcode)
+
+       except DownloadError:
+               sys.exit(1)
+       except SameFileError:
+               sys.exit(u'ERROR: fixed output name but more than one file to download')
+       except KeyboardInterrupt:
+               sys.exit(u'\nERROR: Interrupted by user')