Imported Upstream version 2008.03.22

[youtubedl] / youtube-dl

diff --git a/youtube-dl b/youtube-dl
index 0c2a48fec8c922d959ca22cbe98858a80a55a275..ba27e753c33203381d6987f377fa5dd7b823f299 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
 #!/usr/bin/env python
 #

-# Copyright (c) 2006 Ricardo Garcia Gonzalez
+# Copyright (c) 2006-2008 Ricardo Garcia Gonzalez

 #
 # Permission is hereby granted, free of charge, to any person obtaining a
 # copy of this software and associated documentation files (the "Software"),
 #
 # Permission is hereby granted, free of charge, to any person obtaining a
 # copy of this software and associated documentation files (the "Software"),


@@ -25,38 +25,47 @@
 # sale, use or other dealings in this Software without prior written
 # authorization.
 #
 # sale, use or other dealings in this Software without prior written
 # authorization.
 #

-import sys
-import optparse
+import getpass

 import httplib
 import httplib

-import urllib2
+import math
+import netrc
+import optparse
+import os

 import re
 import re

-
-# First off, check Python and refuse to run
-if sys.hexversion < 0x020400f0:
-       sys.exit('Error: Python 2.4 or later needed to run the program')
+import socket
+import string
+import sys
+import time
+import urllib2

 
 # Global constants
 
 # Global constants

+const_1k = 1024
+const_initial_block_size = 10 * const_1k
+const_epsilon = 0.0001
+const_timeout = 120
+

 const_video_url_str = 'http://www.youtube.com/watch?v=%s'
 const_video_url_str = 'http://www.youtube.com/watch?v=%s'

-const_video_url_re = re.compile(r'http://(?:www\d*\.)?youtube\.com/(?:v/|(?:watch(?:\.php)?)?\?v=)([^&]+).*')
+const_video_url_re = re.compile(r'^((?:http://)?(?:\w+\.)?youtube\.com/(?:v/|(?:watch(?:\.php)?)?\?(?:.+&)?v=))?([0-9A-Za-z_-]+)(?(1)[&/].*)?$')
+const_video_url_format_suffix = '&fmt=%s'
+const_best_quality_format = 18

 const_login_url_str = 'http://www.youtube.com/login?next=/watch%%3Fv%%3D%s'
 const_login_post_str = 'current_form=loginForm&next=%%2Fwatch%%3Fv%%3D%s&username=%s&password=%s&action_login=Log+In'
 const_age_url_str = 'http://www.youtube.com/verify_age?next_url=/watch%%3Fv%%3D%s'
 const_age_post_str = 'next_url=%%2Fwatch%%3Fv%%3D%s&action_confirm=Confirm'
 const_login_url_str = 'http://www.youtube.com/login?next=/watch%%3Fv%%3D%s'
 const_login_post_str = 'current_form=loginForm&next=%%2Fwatch%%3Fv%%3D%s&username=%s&password=%s&action_login=Log+In'
 const_age_url_str = 'http://www.youtube.com/verify_age?next_url=/watch%%3Fv%%3D%s'
 const_age_post_str = 'next_url=%%2Fwatch%%3Fv%%3D%s&action_confirm=Confirm'

-const_video_url_params_re = re.compile(r'player2\.swf\?([^"]+)"', re.M)
-const_video_url_real_str = 'http://www.youtube.com/get_video?%s'
-const_1k = 1024
-const_block_size = 10 * const_1k
+const_url_t_param_re = re.compile(r', "t": "([^"]+)"')
+const_video_url_real_str = 'http://www.youtube.com/get_video?video_id=%s&t=%s'
+const_video_title_re = re.compile(r'<title>YouTube - ([^<]*)</title>', re.M | re.I)

 
 # Print error message, followed by standard advice information, and then exit
 def error_advice_exit(error_text):
        sys.stderr.write('Error: %s.\n' % error_text)
 
 # Print error message, followed by standard advice information, and then exit
 def error_advice_exit(error_text):
        sys.stderr.write('Error: %s.\n' % error_text)

-       sys.stderr.write('Try again several times. It may be a temporal problem.\n')
+       sys.stderr.write('Try again several times. It may be a temporary problem.\n')

        sys.stderr.write('Other typical problems:\n\n')
        sys.stderr.write('Other typical problems:\n\n')

-       sys.stderr.write('\tVideo no longer exists.\n')
-       sys.stderr.write('\tVideo requires age confirmation but you did not provide an account.\n')
-       sys.stderr.write('\tYou provided the account data, but it is not valid.\n')
-       sys.stderr.write('\tThe connection was cut suddenly for some reason.\n')
-       sys.stderr.write('\tYouTube changed their system, and the program no longer works.\n')
+       sys.stderr.write('* Video no longer exists.\n')
+       sys.stderr.write('* Video requires age confirmation but you did not provide an account.\n')
+       sys.stderr.write('* You provided the account data, but it is not valid.\n')
+       sys.stderr.write('* The connection was cut suddenly for some reason.\n')
+       sys.stderr.write('* YouTube changed their system, and the program no longer works.\n')

        sys.stderr.write('\nTry to confirm you are able to view the video using a web browser.\n')
        sys.stderr.write('Use the same video URL and account information, if needed, with this program.\n')
        sys.stderr.write('When using a proxy, make sure http_proxy has http://host:port format.\n')
        sys.stderr.write('\nTry to confirm you are able to view the video using a web browser.\n')
        sys.stderr.write('Use the same video URL and account information, if needed, with this program.\n')
        sys.stderr.write('When using a proxy, make sure http_proxy has http://host:port format.\n')


@@ -64,38 +73,135 @@ def error_advice_exit(error_text):
        sys.exit('\n')
 
 # Wrapper to create custom requests with typical headers
        sys.exit('\n')
 
 # Wrapper to create custom requests with typical headers

-def request_create(url, data=None):
+def request_create(url, extra_headers, post_data):

        retval = urllib2.Request(url)
        retval = urllib2.Request(url)

-       if not data is None:
-               retval.add_data(data)
+       if post_data is not None:
+               retval.add_data(post_data)

        # Try to mimic Firefox, at least a little bit
        # Try to mimic Firefox, at least a little bit

-       retval.add_header('User-Agent', 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0')
+       retval.add_header('User-Agent', 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11')

        retval.add_header('Accept-Charset', 'ISO-8859-1,utf-8;q=0.7,*;q=0.7')
        retval.add_header('Accept', 'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5')
        retval.add_header('Accept-Language', 'en-us,en;q=0.5')
        retval.add_header('Accept-Charset', 'ISO-8859-1,utf-8;q=0.7,*;q=0.7')
        retval.add_header('Accept', 'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5')
        retval.add_header('Accept-Language', 'en-us,en;q=0.5')

+       if extra_headers is not None:
+               for header in extra_headers:
+                       retval.add_header(header[0], header[1])

        return retval
 
 # Perform a request, process headers and return response
        return retval
 
 # Perform a request, process headers and return response

-def perform_request(url, data=None):
-       request = request_create(url, data)
+def perform_request(url, headers=None, data=None):
+       request = request_create(url, headers, data)

        response = urllib2.urlopen(request)
        return response
 
        response = urllib2.urlopen(request)
        return response
 

-# Convert bytes to KiB
-def to_k(bytes):
-       global const_1k
-       return bytes / const_1k
-

 # Conditional print
 def cond_print(str):
        global cmdl_opts
 # Conditional print
 def cond_print(str):
        global cmdl_opts

-       if not cmdl_opts.quiet:
+       if not (cmdl_opts.quiet or cmdl_opts.get_url):

                sys.stdout.write(str)
                sys.stdout.flush()
 
                sys.stdout.write(str)
                sys.stdout.flush()
 

+# Title string normalization
+def title_string_norm(title):
+       title = ''.join((x in string.ascii_letters or x in string.digits) and x or ' ' for x in title)
+       title = '_'.join(title.split())
+       title = title.lower()
+       return title
+
+# Generic download step
+def download_step(return_data_flag, step_title, step_error, url, post_data=None):
+       try:
+               cond_print('%s... ' % step_title)
+               data = perform_request(url, data=post_data).read()
+               cond_print('done.\n')
+               if return_data_flag:
+                       return data
+               return None
+
+       except (urllib2.URLError, ValueError, httplib.HTTPException, TypeError, socket.error):
+               cond_print('failed.\n')
+               error_advice_exit(step_error)
+
+       except KeyboardInterrupt:
+               sys.exit('\n')
+
+# Generic extract step
+def extract_step(step_title, step_error, regexp, data):
+       try:
+               cond_print('%s... ' % step_title)
+               match = regexp.search(data)
+               
+               if match is None:
+                       cond_print('failed.\n')
+                       error_advice_exit(step_error)
+               
+               extracted_data = match.group(1)
+               cond_print('done.\n')
+               return extracted_data
+       
+       except KeyboardInterrupt:
+               sys.exit('\n')
+
+# Calculate new block size based on previous block size
+def new_block_size(before, after, bytes):
+       new_min = max(bytes / 2.0, 1.0)
+       new_max = max(bytes * 2.0, 1.0)
+       dif = after - before
+       if dif < const_epsilon:
+               return int(new_max)
+       rate = bytes / dif
+       if rate > new_max:
+               return int(new_max)
+       if rate < new_min:
+               return int(new_min)
+       return int(rate)
+
+# Get optimum 1k exponent to represent a number of bytes
+def optimum_k_exp(num_bytes):
+       global const_1k
+       if num_bytes == 0:
+               return 0
+       return long(math.log(num_bytes, const_1k))
+
+# Get optimum representation of number of bytes
+def format_bytes(num_bytes):
+       global const_1k
+       try:
+               exp = optimum_k_exp(num_bytes)
+               suffix = 'bkMGTPEZY'[exp]
+               if exp == 0:
+                       return '%s%s' % (num_bytes, suffix)
+               converted = float(num_bytes) / float(const_1k**exp)
+               return '%.2f%s' % (converted, suffix)
+       except IndexError:
+               sys.exit('Error: internal error formatting number of bytes.')
+
+# Calculate ETA and return it in string format as MM:SS
+def calc_eta(start, now, total, current):
+       dif = now - start
+       if current == 0 or dif < const_epsilon:
+               return '--:--'
+       rate = float(current) / dif
+       eta = long((total - current) / rate)
+       (eta_mins, eta_secs) = divmod(eta, 60)
+       if eta_mins > 99:
+               return '--:--'
+       return '%02d:%02d' % (eta_mins, eta_secs)
+
+# Calculate speed and return it in string format
+def calc_speed(start, now, bytes):
+       dif = now - start
+       if bytes == 0 or dif < const_epsilon:
+               return 'N/A b'
+       return format_bytes(float(bytes) / dif)
+
+
+# Title string minimal transformation
+def title_string_touch(title):
+       return title.replace(os.sep, '%')
+

 # Create the command line options parser and parse command line
 cmdl_usage = 'usage: %prog [options] video_url'
 # Create the command line options parser and parse command line
 cmdl_usage = 'usage: %prog [options] video_url'

-cmdl_version = '2006.11.12'
+cmdl_version = '2008.03.22'

 cmdl_parser = optparse.OptionParser(usage=cmdl_usage, version=cmdl_version, conflict_handler='resolve')
 cmdl_parser.add_option('-h', '--help', action='help', help='print this help text and exit')
 cmdl_parser.add_option('-v', '--version', action='version', help='print program version and exit')
 cmdl_parser = optparse.OptionParser(usage=cmdl_usage, version=cmdl_version, conflict_handler='resolve')
 cmdl_parser.add_option('-h', '--help', action='help', help='print this help text and exit')
 cmdl_parser.add_option('-v', '--version', action='version', help='print program version and exit')


@@ -104,8 +210,18 @@ cmdl_parser.add_option('-p', '--password', dest='password', metavar='PASSWORD',
 cmdl_parser.add_option('-o', '--output', dest='outfile', metavar='FILE', help='output video file name')
 cmdl_parser.add_option('-q', '--quiet', action='store_true', dest='quiet', help='activates quiet mode')
 cmdl_parser.add_option('-s', '--simulate', action='store_true', dest='simulate', help='do not download video')
 cmdl_parser.add_option('-o', '--output', dest='outfile', metavar='FILE', help='output video file name')
 cmdl_parser.add_option('-q', '--quiet', action='store_true', dest='quiet', help='activates quiet mode')
 cmdl_parser.add_option('-s', '--simulate', action='store_true', dest='simulate', help='do not download video')

+cmdl_parser.add_option('-t', '--title', action='store_true', dest='use_title', help='use title in file name')
+cmdl_parser.add_option('-l', '--literal', action='store_true', dest='use_literal', help='use literal title in file name')
+cmdl_parser.add_option('-n', '--netrc', action='store_true', dest='use_netrc', help='use .netrc authentication data')
+cmdl_parser.add_option('-g', '--get-url', action='store_true', dest='get_url', help='print final video URL only')
+cmdl_parser.add_option('-2', '--title-too', action='store_true', dest='get_title', help='used with -g, print title too')
+cmdl_parser.add_option('-f', '--format', dest='video_format', metavar='FORMAT', help='append &fmt=FORMAT to the URL')
+cmdl_parser.add_option('-b', '--best-quality', action='store_true', dest='best_quality', help='alias for -f 18')

 (cmdl_opts, cmdl_args) = cmdl_parser.parse_args()
 
 (cmdl_opts, cmdl_args) = cmdl_parser.parse_args()
 

+# Set socket timeout
+socket.setdefaulttimeout(const_timeout)
+

 # Get video URL
 if len(cmdl_args) != 1:
        cmdl_parser.print_help()
 # Get video URL
 if len(cmdl_args) != 1:
        cmdl_parser.print_help()


@@ -116,130 +232,180 @@ video_url_cmdl = cmdl_args[0]
 video_url_mo = const_video_url_re.match(video_url_cmdl)
 if video_url_mo is None:
        sys.exit('Error: URL does not seem to be a youtube video URL. If it is, report a bug.')
 video_url_mo = const_video_url_re.match(video_url_cmdl)
 if video_url_mo is None:
        sys.exit('Error: URL does not seem to be a youtube video URL. If it is, report a bug.')

-video_url_id = video_url_mo.group(1)
+video_url_id = video_url_mo.group(2)

 video_url = const_video_url_str % video_url_id
 
 video_url = const_video_url_str % video_url_id
 

+video_format = None
+if cmdl_opts.best_quality:
+       video_format = const_best_quality_format
+       video_extension = '.mp4'
+else:
+       video_extension = '.flv'
+
+if cmdl_opts.video_format is not None:
+       if video_format is not None and video_format != cmdl_opts.video_format:
+               sys.exit('Error: conflicting video formats specified\n')
+       video_format = cmdl_opts.video_format
+
+if video_format is not None:
+       video_url = '%s%s' % (video_url, const_video_url_format_suffix % video_format)
+

 # Check conflicting options
 # Check conflicting options

-if not cmdl_opts.outfile is None and cmdl_opts.simulate:
+if cmdl_opts.outfile is not None and (cmdl_opts.simulate or cmdl_opts.get_url):

        sys.stderr.write('Warning: video file name given but will not be used.\n')
 
        sys.stderr.write('Warning: video file name given but will not be used.\n')
 

-# Get output file name 
-if cmdl_opts.outfile is None:
-       video_filename = '%s.flv' % video_url_id
-else:
-       video_filename = cmdl_opts.outfile
+if cmdl_opts.outfile is not None and (cmdl_opts.use_title or cmdl_opts.use_literal):
+       sys.exit('Error: using the video title conflicts with using a given file name.')

 
 

-# Check name
-if not video_filename.lower().endswith('.flv'):
-       sys.stderr.write('Warning: video file name does not end in .flv\n')
+if cmdl_opts.use_title and cmdl_opts.use_literal:
+       sys.exit('Error: cannot use title and literal title at the same time.')

 
 

-# Verify both or none present
-if ((cmdl_opts.username is None and not cmdl_opts.password is None) or
-    (not cmdl_opts.username is None and cmdl_opts.password is None)):
-       sys.exit('Error: both username and password must be given, or none.')
+if cmdl_opts.quiet and cmdl_opts.get_url:
+       sys.exit('Error: cannot be quiet and print final URL at the same time.')

 
 

-# Test writable file
-if not cmdl_opts.simulate:
-       try:
-               disk_test = open(video_filename, 'wb')
-               disk_test.close()
+# Incorrect option formatting
+if cmdl_opts.username is None and cmdl_opts.password is not None:
+       sys.exit('Error: password give but username is missing.')

 
 

-       except (OSError, IOError):
-               sys.exit('Error: unable to open %s for writing.' % video_filename)
+if cmdl_opts.use_netrc and (cmdl_opts.username is not None or cmdl_opts.password is not None):
+       sys.exit('Error: cannot use netrc and username/password at the same time.')

 
 

-# Install cookie and proxy handlers
-urllib2.install_opener(urllib2.build_opener(urllib2.ProxyHandler()))
-urllib2.install_opener(urllib2.build_opener(urllib2.HTTPCookieProcessor()))
+if cmdl_opts.get_url is None and cmdl_opts.get_title is not None:
+       sys.exit('Error: getting title requires getting URL.')

 
 

-# Login and confirm age if needed
-if not cmdl_opts.username is None:
-       try:
-               # Log in
-               cond_print('Logging in... ')
-               perform_request(const_login_url_str % video_url_id, const_login_post_str % (video_url_id, cmdl_opts.username, cmdl_opts.password)).read()
-               cond_print('done.\n')
+# Get account information if any
+account_username = None
+account_password = None

 
 

-       except (urllib2.URLError, ValueError, httplib.HTTPException, TypeError):
-               cond_print('failed.\n')
-               error_advice_exit('unable to login')
+if cmdl_opts.use_netrc:
+       try:
+               info = netrc.netrc().authenticators('youtube')
+               if info is None:
+                       sys.exit('Error: no authenticators for machine youtube.')
+               account_username = info[0]
+               account_password = info[2]
+       except IOError:
+               sys.exit('Error: unable to read .netrc file.')
+       except netrc.NetrcParseError:
+               sys.exit('Error: unable to parse .netrc file.')
+else:
+       account_username = cmdl_opts.username
+       if account_username is not None:
+               if cmdl_opts.password is None:
+                       account_password = getpass.getpass('Type YouTube password and press return: ')
+               else:
+                       account_password = cmdl_opts.password

 
 

-       except KeyboardInterrupt:
-               sys.exit('\n')
+# Get output file name 
+if cmdl_opts.outfile is None:
+       video_filename = '%s%s' % (video_url_id, video_extension)
+else:
+       video_filename = cmdl_opts.outfile

 
 

-       try:
-               # Get age confirmation cookie
-               cond_print('Confirming age... ')
-               perform_request(const_age_url_str % video_url_id, const_age_post_str % video_url_id).read()
-               cond_print('done.\n')
+# Install cookie and proxy handlers
+urllib2.install_opener(urllib2.build_opener(urllib2.ProxyHandler()))
+urllib2.install_opener(urllib2.build_opener(urllib2.HTTPCookieProcessor()))

 
 

-       except (urllib2.URLError, ValueError, httplib.HTTPException, TypeError):
-               cond_print('failed.\n')
-               error_advice_exit('unable to confirm age')
+# Log in and confirm age if needed
+if account_username is not None:
+       url = const_login_url_str % video_url_id
+       post = const_login_post_str % (video_url_id, account_username, account_password)
+       download_step(False, 'Logging in', 'unable to log in', url, post)

 
 

-       except KeyboardInterrupt:
-               sys.exit('\n')
+       url = const_age_url_str % video_url_id
+       post = const_age_post_str % video_url_id
+       download_step(False, 'Confirming age', 'unable to confirm age', url, post)

 
 # Retrieve video webpage
 
 # Retrieve video webpage

-try:
-       cond_print('Retrieving video webpage... ')
-       video_webpage = perform_request(video_url).read()
-       cond_print('done.\n')
+video_webpage = download_step(True, 'Retrieving video webpage', 'unable to retrieve video webpage', video_url)

 
 

-except (urllib2.URLError, ValueError, httplib.HTTPException, TypeError):
-       cond_print('failed.\n')
-       error_advice_exit('unable to download video webpage')
-
-except KeyboardInterrupt:
-       sys.exit('\n')
+# Extract video title if needed
+if cmdl_opts.use_title or cmdl_opts.use_literal or cmdl_opts.get_title:
+       video_title = extract_step('Extracting video title', 'unable to extract video title', const_video_title_re, video_webpage)

 
 # Extract needed video URL parameters
 
 # Extract needed video URL parameters

-try:
-       cond_print('Extracting video URL parameters... ')
-       video_url_params_mo = const_video_url_params_re.search(video_webpage)
-       
-       if video_url_params_mo is None:
-               cond_print('failed.\n')
-               error_advice_exit('unable to extract URL parameters')
-       
-       video_url_params = video_url_params_mo.group(1)
-       video_url_real = const_video_url_real_str % video_url_params
-       cond_print('done.\n')
+video_url_t_param = extract_step('Extracting URL "t" parameter', 'unable to extract URL "t" parameter', const_url_t_param_re, video_webpage)
+video_url_real = const_video_url_real_str % (video_url_id, video_url_t_param)
+if video_format is not None:
+       video_url_real = '%s%s' % (video_url_real, const_video_url_format_suffix % video_format)
+
+# Rebuild filename if needed
+if cmdl_opts.use_title or cmdl_opts.use_literal:
+       if cmdl_opts.use_title:
+               prefix = title_string_norm(video_title)
+       else:
+               prefix = title_string_touch(video_title)
+       video_filename = '%s-%s%s' % (prefix, video_url_id, video_extension)

 
 

-except KeyboardInterrupt:
-       sys.exit('\n')
+# Check name
+if not video_filename.lower().endswith(video_extension):
+       sys.stderr.write('Warning: video file name does not end in %s\n' % video_extension)

 
 # Retrieve video data
 try:
 
 # Retrieve video data
 try:

+       cond_print('Requesting video file... ')

        video_data = perform_request(video_url_real)
        video_data = perform_request(video_url_real)

+       cond_print('done.\n')

        cond_print('Video data found at %s\n' % video_data.geturl())
 
        cond_print('Video data found at %s\n' % video_data.geturl())
 

-       # Abort here if in simulate mode
-       if cmdl_opts.simulate:
+       if cmdl_opts.get_title:
+               print video_title
+
+       if cmdl_opts.get_url:
+               print video_data.geturl()
+
+       if cmdl_opts.simulate or cmdl_opts.get_url:

                sys.exit()
 
                sys.exit()
 

-       cond_print('Retrieving video data... ')
-       video_file = open(video_filename, 'wb')

        try:
        try:

-               video_len_str = '%sk' % to_k(int(video_data.info()['Content-length']))
+               video_file = open(video_filename, 'wb')
+       except (IOError, OSError):
+               sys.exit('Error: unable to open "%s" for writing.' % video_filename)
+       try:
+               video_len = long(video_data.info()['Content-length'])
+               video_len_str = format_bytes(video_len)

        except KeyError:
        except KeyError:

-               video_len_str = '(unknown)'
+               video_len = None
+               video_len_str = 'N/A'

 
        byte_counter = 0
 
        byte_counter = 0

-       video_block = video_data.read(const_block_size)
-       while len(video_block) != 0:
-               byte_counter += len(video_block)
+       block_size = const_initial_block_size
+       start_time = time.time()
+       while True:
+               if video_len is not None:
+                       percent = float(byte_counter) / float(video_len) * 100.0
+                       percent_str = '%.1f' % percent
+                       eta_str = calc_eta(start_time, time.time(), video_len, byte_counter)
+               else:
+                       percent_str = '---.-'
+                       eta_str = '--:--'
+               counter = format_bytes(byte_counter)
+               speed_str = calc_speed(start_time, time.time(), byte_counter)
+               cond_print('\rRetrieving video data: %5s%% (%8s of %s) at %8s/s ETA %s ' % (percent_str, counter, video_len_str, speed_str, eta_str))
+
+               before = time.time()
+               video_block = video_data.read(block_size)
+               after = time.time()
+               dl_bytes = len(video_block)
+               if dl_bytes == 0:
+                       break
+               byte_counter += dl_bytes

                video_file.write(video_block)
                video_file.write(video_block)

-               cond_print('\rRetrieving video data... %sk of %s ' % (to_k(byte_counter), video_len_str))
-               video_block = video_data.read(const_block_size)
+               block_size = new_block_size(before, after, dl_bytes)
+
+       if video_len is not None and byte_counter != video_len:
+               error_advice_exit('server did not send the expected ammount of data')

 
        video_file.close()
        cond_print('done.\n')
        cond_print('Video data saved to %s\n' % video_filename)
 
        video_file.close()
        cond_print('done.\n')
        cond_print('Video data saved to %s\n' % video_filename)

-       sys.exit()

 
 

-except (urllib2.URLError, ValueError, httplib.HTTPException, TypeError):
+except (urllib2.URLError, ValueError, httplib.HTTPException, TypeError, socket.error):

        cond_print('failed.\n')
        error_advice_exit('unable to download video data')
 
 except KeyboardInterrupt:
        sys.exit('\n')
        cond_print('failed.\n')
        error_advice_exit('unable to download video data')
 
 except KeyboardInterrupt:
        sys.exit('\n')

+
+# Finish
+sys.exit()