_ Git - youtube-dl/blob - youtube_dl/extractor/youtube.py

   1 # coding: utf-8
   2
   3 import json
   4 import netrc
   5 import re
   6 import socket
   7
   8 from .common import InfoExtractor, SearchInfoExtractor
   9 from ..utils import (
  10     compat_http_client,
  11     compat_parse_qs,
  12     compat_urllib_error,
  13     compat_urllib_parse,
  14     compat_urllib_request,
  15     compat_str,
  16
  17     clean_html,
  18     get_element_by_id,
  19     ExtractorError,
  20     unescapeHTML,
  21     unified_strdate,
  22 )
  23
  24
  25 class YoutubeIE(InfoExtractor):
  26     """Information extractor for youtube.com."""
  27
  28     _VALID_URL = r"""^
  29                      (
  30                          (?:https?://)?                                       # http(s):// (optional)
  31                          (?:youtu\.be/|(?:\w+\.)?youtube(?:-nocookie)?\.com/|
  32                             tube\.majestyc\.net/)                             # the various hostnames, with wildcard subdomains
  33                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
  34                          (?:                                                  # the various things that can precede the ID:
  35                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
  36                              |(?:                                             # or the v= param in all its forms
  37                                  (?:watch(?:_popup)?(?:\.php)?)?              # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
  38                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
  39                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
  40                                  v=
  41                              )
  42                          )?                                                   # optional -> youtube.com/xxxx is OK
  43                      )?                                                       # all until now is optional -> you can pass the naked ID
  44                      ([0-9A-Za-z_-]+)                                         # here is it! the YouTube video ID
  45                      (?(1).+)?                                                # if we found the ID, everything can follow
  46                      $"""
  47     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
  48     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  49     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
  50     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
  51     _NETRC_MACHINE = 'youtube'
  52     # Listed in order of quality
  53     _available_formats = ['38', '37', '46', '22', '45', '35', '44', '34', '18', '43', '6', '5', '17', '13']
  54     _available_formats_prefer_free = ['38', '46', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '17', '13']
  55     _video_extensions = {
  56         '13': '3gp',
  57         '17': 'mp4',
  58         '18': 'mp4',
  59         '22': 'mp4',
  60         '37': 'mp4',
  61         '38': 'mp4',
  62         '43': 'webm',
  63         '44': 'webm',
  64         '45': 'webm',
  65         '46': 'webm',
  66     }
  67     _video_dimensions = {
  68         '5': '240x400',
  69         '6': '???',
  70         '13': '???',
  71         '17': '144x176',
  72         '18': '360x640',
  73         '22': '720x1280',
  74         '34': '360x640',
  75         '35': '480x854',
  76         '37': '1080x1920',
  77         '38': '3072x4096',
  78         '43': '360x640',
  79         '44': '480x854',
  80         '45': '720x1280',
  81         '46': '1080x1920',
  82     }
  83     IE_NAME = u'youtube'
  84
  85     @classmethod
  86     def suitable(cls, url):
  87         """Receives a URL and returns True if suitable for this IE."""
  88         if YoutubePlaylistIE.suitable(url): return False
  89         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
  90
  91     def report_lang(self):
  92         """Report attempt to set language."""
  93         self.to_screen(u'Setting language')
  94
  95     def report_login(self):
  96         """Report attempt to log in."""
  97         self.to_screen(u'Logging in')
  98
  99     def report_video_webpage_download(self, video_id):
 100         """Report attempt to download video webpage."""
 101         self.to_screen(u'%s: Downloading video webpage' % video_id)
 102
 103     def report_video_info_webpage_download(self, video_id):
 104         """Report attempt to download video info webpage."""
 105         self.to_screen(u'%s: Downloading video info webpage' % video_id)
 106
 107     def report_video_subtitles_download(self, video_id):
 108         """Report attempt to download video info webpage."""
 109         self.to_screen(u'%s: Checking available subtitles' % video_id)
 110
 111     def report_video_subtitles_request(self, video_id, sub_lang, format):
 112         """Report attempt to download video info webpage."""
 113         self.to_screen(u'%s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
 114
 115     def report_video_subtitles_available(self, video_id, sub_lang_list):
 116         """Report available subtitles."""
 117         sub_lang = ",".join(list(sub_lang_list.keys()))
 118         self.to_screen(u'%s: Available subtitles for video: %s' % (video_id, sub_lang))
 119
 120     def report_information_extraction(self, video_id):
 121         """Report attempt to extract video information."""
 122         self.to_screen(u'%s: Extracting video information' % video_id)
 123
 124     def report_unavailable_format(self, video_id, format):
 125         """Report extracted video URL."""
 126         self.to_screen(u'%s: Format %s not available' % (video_id, format))
 127
 128     def report_rtmp_download(self):
 129         """Indicate the download will use the RTMP protocol."""
 130         self.to_screen(u'RTMP download detected')
 131
 132     def _decrypt_signature(self, s):
 133         """Decrypt the key the two subkeys must have a length of 43"""
 134         if self._downloader.params.get('verbose'):
 135             self.to_screen('encrypted signature length %d' % (len(s)))
 136
 137         if len(s) == 88:
 138             return s[48] + s[81] + s[80] + s[79] + s[78] + s[77] + s[76] + s[75] + s[74] + s[73] + s[72] + s[71] + s[70] + s[69] + s[68] + s[82] + s[66] + s[65] + s[64] + s[63] + s[85] + s[61] + s[60] + s[59] + s[58] + s[57] + s[56] + s[55] + s[54] + s[53] + s[52] + s[51] + s[50] + s[49] + s[67] + s[47] + s[46] + s[45] + s[44] + s[43] + s[42] + s[41] + s[40] + s[39] + s[38] + s[37] + s[36] + s[35] + s[34] + s[33] + s[32] + s[31] + s[30] + s[29] + s[28] + s[27] + s[26] + s[25] + s[24] + s[23] + s[22] + s[21] + s[20] + s[19] + s[18] + s[17] + s[16] + s[15] + s[14] + s[13] + s[3] + s[11] + s[10] + s[9] + s[8] + s[7] + s[6] + s[5] + s[4] + s[2] + s[12]
 139         elif len(s) == 87:
 140             return s[62] + s[82] + s[81] + s[80] + s[79] + s[78] + s[77] + s[76] + s[75] + s[74] + s[73] + s[72] + s[71] + s[70] + s[69] + s[68] + s[67] + s[66] + s[65] + s[64] + s[63] + s[83] + s[61] + s[60] + s[59] + s[58] + s[57] + s[56] + s[55] + s[54] + s[53] + s[0] + s[51] + s[50] + s[49] + s[48] + s[47] + s[46] + s[45] + s[44] + s[43] + s[42] + s[41] + s[40] + s[39] + s[38] + s[37] + s[36] + s[35] + s[34] + s[33] + s[32] + s[31] + s[30] + s[29] + s[28] + s[27] + s[26] + s[25] + s[24] + s[23] + s[22] + s[21] + s[20] + s[19] + s[18] + s[17] + s[16] + s[15] + s[14] + s[13] + s[12] + s[11] + s[10] + s[9] + s[8] + s[7] + s[6] + s[5] + s[4] + s[3]
 141         elif len(s) == 86:
 142             return s[2] + s[3] + s[4] + s[5] + s[6] + s[7] + s[8] + s[9] + s[10] + s[11] + s[12] + s[13] + s[14] + s[15] + s[16] + s[0] + s[18] + s[19] + s[20] + s[21] + s[22] + s[23] + s[24] + s[25] + s[26] + s[27] + s[28] + s[29] + s[30] + s[31] + s[32] + s[33] + s[34] + s[35] + s[36] + s[37] + s[38] + s[39] + s[40] + s[79] + s[42] + s[43] + s[44] + s[45] + s[46] + s[47] + s[48] + s[49] + s[50] + s[51] + s[52] + s[53] + s[54] + s[55] + s[56] + s[57] + s[58] + s[59] + s[60] + s[61] + s[62] + s[63] + s[64] + s[65] + s[66] + s[67] + s[68] + s[69] + s[70] + s[71] + s[72] + s[73] + s[74] + s[75] + s[76] + s[77] + s[78] + s[82] + s[80] + s[81] + s[41]
 143         elif len(s) == 85:
 144             return s[76] + s[82] + s[81] + s[80] + s[79] + s[78] + s[77] + s[83] + s[75] + s[74] + s[73] + s[72] + s[71] + s[70] + s[69] + s[68] + s[67] + s[66] + s[65] + s[64] + s[63] + s[62] + s[61] + s[0] + s[59] + s[58] + s[57] + s[56] + s[55] + s[54] + s[53] + s[52] + s[51] + s[1] + s[49] + s[48] + s[47] + s[46] + s[45] + s[44] + s[43] + s[42] + s[41] + s[40] + s[39] + s[38] + s[37] + s[36] + s[35] + s[34] + s[33] + s[32] + s[31] + s[30] + s[29] + s[28] + s[27] + s[26] + s[25] + s[24] + s[23] + s[22] + s[21] + s[20] + s[19] + s[18] + s[17] + s[16] + s[15] + s[14] + s[13] + s[12] + s[11] + s[10] + s[9] + s[8] + s[7] + s[6] + s[5] + s[4] + s[3]
 145         elif len(s) == 84:
 146             return s[83] + s[82] + s[81] + s[80] + s[79] + s[78] + s[77] + s[76] + s[75] + s[74] + s[73] + s[72] + s[71] + s[70] + s[69] + s[68] + s[67] + s[66] + s[65] + s[64] + s[63] + s[62] + s[61] + s[60] + s[59] + s[58] + s[57] + s[56] + s[55] + s[54] + s[53] + s[52] + s[51] + s[50] + s[49] + s[48] + s[47] + s[46] + s[45] + s[44] + s[43] + s[42] + s[41] + s[40] + s[39] + s[38] + s[37] + s[2] + s[35] + s[34] + s[33] + s[32] + s[31] + s[30] + s[29] + s[28] + s[27] + s[3] + s[25] + s[24] + s[23] + s[22] + s[21] + s[20] + s[19] + s[18] + s[17] + s[16] + s[15] + s[14] + s[13] + s[12] + s[11] + s[10] + s[9] + s[8] + s[7] + s[6] + s[5] + s[4] + s[26]
 147         elif len(s) == 83:
 148             return s[52] + s[81] + s[80] + s[79] + s[78] + s[77] + s[76] + s[75] + s[74] + s[73] + s[72] + s[71] + s[70] + s[69] + s[68] + s[67] + s[66] + s[65] + s[64] + s[63] + s[62] + s[61] + s[60] + s[59] + s[58] + s[57] + s[56] + s[2] + s[54] + s[53] + s[82] + s[51] + s[50] + s[49] + s[48] + s[47] + s[46] + s[45] + s[44] + s[43] + s[42] + s[41] + s[40] + s[39] + s[38] + s[37] + s[55] + s[35] + s[34] + s[33] + s[32] + s[31] + s[30] + s[29] + s[28] + s[27] + s[26] + s[25] + s[24] + s[23] + s[22] + s[21] + s[20] + s[19] + s[18] + s[17] + s[16] + s[15] + s[14] + s[13] + s[12] + s[11] + s[10] + s[9] + s[8] + s[7] + s[6] + s[5] + s[4] + s[3] + s[36]
 149         elif len(s) == 82:
 150             return s[36] + s[79] + s[78] + s[77] + s[76] + s[75] + s[74] + s[73] + s[72] + s[71] + s[70] + s[69] + s[68] + s[81] + s[66] + s[65] + s[64] + s[63] + s[62] + s[61] + s[60] + s[59] + s[58] + s[57] + s[56] + s[55] + s[54] + s[53] + s[52] + s[51] + s[50] + s[49] + s[48] + s[47] + s[46] + s[45] + s[44] + s[43] + s[42] + s[41] + s[33] + s[39] + s[38] + s[37] + s[40] + s[35] + s[0] + s[67] + s[32] + s[31] + s[30] + s[29] + s[28] + s[27] + s[26] + s[25] + s[24] + s[23] + s[22] + s[21] + s[20] + s[19] + s[18] + s[17] + s[16] + s[15] + s[14] + s[13] + s[12] + s[11] + s[10] + s[9] + s[8] + s[7] + s[6] + s[5] + s[4] + s[3] + s[2] + s[1] + s[34]
 151         else:
 152             raise ExtractorError(u'Unable to decrypt signature, subkeys length %d not supported; retrying might work' % (len(s)))
 153
 154     def _get_available_subtitles(self, video_id):
 155         self.report_video_subtitles_download(video_id)
 156         request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
 157         try:
 158             sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
 159         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 160             return (u'unable to download video subtitles: %s' % compat_str(err), None)
 161         sub_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
 162         sub_lang_list = dict((l[1], l[0]) for l in sub_lang_list)
 163         if not sub_lang_list:
 164             return (u'video doesn\'t have subtitles', None)
 165         return sub_lang_list
 166
 167     def _list_available_subtitles(self, video_id):
 168         sub_lang_list = self._get_available_subtitles(video_id)
 169         self.report_video_subtitles_available(video_id, sub_lang_list)
 170
 171     def _request_subtitle(self, sub_lang, sub_name, video_id, format):
 172         """
 173         Return tuple:
 174         (error_message, sub_lang, sub)
 175         """
 176         self.report_video_subtitles_request(video_id, sub_lang, format)
 177         params = compat_urllib_parse.urlencode({
 178             'lang': sub_lang,
 179             'name': sub_name,
 180             'v': video_id,
 181             'fmt': format,
 182         })
 183         url = 'http://www.youtube.com/api/timedtext?' + params
 184         try:
 185             sub = compat_urllib_request.urlopen(url).read().decode('utf-8')
 186         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 187             return (u'unable to download video subtitles: %s' % compat_str(err), None, None)
 188         if not sub:
 189             return (u'Did not fetch video subtitles', None, None)
 190         return (None, sub_lang, sub)
 191
 192     def _request_automatic_caption(self, video_id, webpage):
 193         """We need the webpage for getting the captions url, pass it as an
 194            argument to speed up the process."""
 195         sub_lang = self._downloader.params.get('subtitleslang') or 'en'
 196         sub_format = self._downloader.params.get('subtitlesformat')
 197         self.to_screen(u'%s: Looking for automatic captions' % video_id)
 198         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
 199         err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
 200         if mobj is None:
 201             return [(err_msg, None, None)]
 202         player_config = json.loads(mobj.group(1))
 203         try:
 204             args = player_config[u'args']
 205             caption_url = args[u'ttsurl']
 206             timestamp = args[u'timestamp']
 207             params = compat_urllib_parse.urlencode({
 208                 'lang': 'en',
 209                 'tlang': sub_lang,
 210                 'fmt': sub_format,
 211                 'ts': timestamp,
 212                 'kind': 'asr',
 213             })
 214             subtitles_url = caption_url + '&' + params
 215             sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
 216             return [(None, sub_lang, sub)]
 217         except KeyError:
 218             return [(err_msg, None, None)]
 219
 220     def _extract_subtitle(self, video_id):
 221         """
 222         Return a list with a tuple:
 223         [(error_message, sub_lang, sub)]
 224         """
 225         sub_lang_list = self._get_available_subtitles(video_id)
 226         sub_format = self._downloader.params.get('subtitlesformat')
 227         if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
 228             return [(sub_lang_list[0], None, None)]
 229         if self._downloader.params.get('subtitleslang', False):
 230             sub_lang = self._downloader.params.get('subtitleslang')
 231         elif 'en' in sub_lang_list:
 232             sub_lang = 'en'
 233         else:
 234             sub_lang = list(sub_lang_list.keys())[0]
 235         if not sub_lang in sub_lang_list:
 236             return [(u'no closed captions found in the specified language "%s"' % sub_lang, None, None)]
 237
 238         subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
 239         return [subtitle]
 240
 241     def _extract_all_subtitles(self, video_id):
 242         sub_lang_list = self._get_available_subtitles(video_id)
 243         sub_format = self._downloader.params.get('subtitlesformat')
 244         if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
 245             return [(sub_lang_list[0], None, None)]
 246         subtitles = []
 247         for sub_lang in sub_lang_list:
 248             subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
 249             subtitles.append(subtitle)
 250         return subtitles
 251
 252     def _print_formats(self, formats):
 253         print('Available formats:')
 254         for x in formats:
 255             print('%s\t:\t%s\t[%s]' %(x, self._video_extensions.get(x, 'flv'), self._video_dimensions.get(x, '???')))
 256
 257     def _real_initialize(self):
 258         if self._downloader is None:
 259             return
 260
 261         username = None
 262         password = None
 263         downloader_params = self._downloader.params
 264
 265         # Attempt to use provided username and password or .netrc data
 266         if downloader_params.get('username', None) is not None:
 267             username = downloader_params['username']
 268             password = downloader_params['password']
 269         elif downloader_params.get('usenetrc', False):
 270             try:
 271                 info = netrc.netrc().authenticators(self._NETRC_MACHINE)
 272                 if info is not None:
 273                     username = info[0]
 274                     password = info[2]
 275                 else:
 276                     raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
 277             except (IOError, netrc.NetrcParseError) as err:
 278                 self._downloader.report_warning(u'parsing .netrc: %s' % compat_str(err))
 279                 return
 280
 281         # Set language
 282         request = compat_urllib_request.Request(self._LANG_URL)
 283         try:
 284             self.report_lang()
 285             compat_urllib_request.urlopen(request).read()
 286         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 287             self._downloader.report_warning(u'unable to set language: %s' % compat_str(err))
 288             return
 289
 290         # No authentication to be performed
 291         if username is None:
 292             return
 293
 294         request = compat_urllib_request.Request(self._LOGIN_URL)
 295         try:
 296             login_page = compat_urllib_request.urlopen(request).read().decode('utf-8')
 297         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 298             self._downloader.report_warning(u'unable to fetch login page: %s' % compat_str(err))
 299             return
 300
 301         galx = None
 302         dsh = None
 303         match = re.search(re.compile(r'<input.+?name="GALX".+?value="(.+?)"', re.DOTALL), login_page)
 304         if match:
 305           galx = match.group(1)
 306
 307         match = re.search(re.compile(r'<input.+?name="dsh".+?value="(.+?)"', re.DOTALL), login_page)
 308         if match:
 309           dsh = match.group(1)
 310
 311         # Log in
 312         login_form_strs = {
 313                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
 314                 u'Email': username,
 315                 u'GALX': galx,
 316                 u'Passwd': password,
 317                 u'PersistentCookie': u'yes',
 318                 u'_utf8': u'霱',
 319                 u'bgresponse': u'js_disabled',
 320                 u'checkConnection': u'',
 321                 u'checkedDomains': u'youtube',
 322                 u'dnConn': u'',
 323                 u'dsh': dsh,
 324                 u'pstMsg': u'0',
 325                 u'rmShown': u'1',
 326                 u'secTok': u'',
 327                 u'signIn': u'Sign in',
 328                 u'timeStmp': u'',
 329                 u'service': u'youtube',
 330                 u'uilel': u'3',
 331                 u'hl': u'en_US',
 332         }
 333         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
 334         # chokes on unicode
 335         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
 336         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
 337         request = compat_urllib_request.Request(self._LOGIN_URL, login_data)
 338         try:
 339             self.report_login()
 340             login_results = compat_urllib_request.urlopen(request).read().decode('utf-8')
 341             if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
 342                 self._downloader.report_warning(u'unable to log in: bad username or password')
 343                 return
 344         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 345             self._downloader.report_warning(u'unable to log in: %s' % compat_str(err))
 346             return
 347
 348         # Confirm age
 349         age_form = {
 350                 'next_url':     '/',
 351                 'action_confirm':   'Confirm',
 352                 }
 353         request = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
 354         try:
 355             self.report_age_confirmation()
 356             compat_urllib_request.urlopen(request).read().decode('utf-8')
 357         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 358             raise ExtractorError(u'Unable to confirm age: %s' % compat_str(err))
 359
 360     def _extract_id(self, url):
 361         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 362         if mobj is None:
 363             raise ExtractorError(u'Invalid URL: %s' % url)
 364         video_id = mobj.group(2)
 365         return video_id
 366
 367     def _real_extract(self, url):
 368         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
 369         mobj = re.search(self._NEXT_URL_RE, url)
 370         if mobj:
 371             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
 372         video_id = self._extract_id(url)
 373
 374         # Get video webpage
 375         self.report_video_webpage_download(video_id)
 376         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
 377         request = compat_urllib_request.Request(url)
 378         try:
 379             video_webpage_bytes = compat_urllib_request.urlopen(request).read()
 380         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 381             raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err))
 382
 383         video_webpage = video_webpage_bytes.decode('utf-8', 'ignore')
 384
 385         # Attempt to extract SWF player URL
 386         mobj = re.search(r'swfConfig.*?"(http:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
 387         if mobj is not None:
 388             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
 389         else:
 390             player_url = None
 391
 392         # Get video info
 393         self.report_video_info_webpage_download(video_id)
 394         for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
 395             video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
 396                     % (video_id, el_type))
 397             video_info_webpage = self._download_webpage(video_info_url, video_id,
 398                                     note=False,
 399                                     errnote='unable to download video info webpage')
 400             video_info = compat_parse_qs(video_info_webpage)
 401             if 'token' in video_info:
 402                 break
 403         if 'token' not in video_info:
 404             if 'reason' in video_info:
 405                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0])
 406             else:
 407                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
 408
 409         # Check for "rental" videos
 410         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
 411             raise ExtractorError(u'"rental" videos not supported')
 412
 413         # Start extracting information
 414         self.report_information_extraction(video_id)
 415
 416         # uploader
 417         if 'author' not in video_info:
 418             raise ExtractorError(u'Unable to extract uploader name')
 419         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
 420
 421         # uploader_id
 422         video_uploader_id = None
 423         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
 424         if mobj is not None:
 425             video_uploader_id = mobj.group(1)
 426         else:
 427             self._downloader.report_warning(u'unable to extract uploader nickname')
 428
 429         # title
 430         if 'title' not in video_info:
 431             raise ExtractorError(u'Unable to extract video title')
 432         video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
 433
 434         # thumbnail image
 435         if 'thumbnail_url' not in video_info:
 436             self._downloader.report_warning(u'unable to extract video thumbnail')
 437             video_thumbnail = ''
 438         else:   # don't panic if we can't find it
 439             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
 440
 441         # upload date
 442         upload_date = None
 443         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
 444         if mobj is not None:
 445             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
 446             upload_date = unified_strdate(upload_date)
 447
 448         # description
 449         video_description = get_element_by_id("eow-description", video_webpage)
 450         if video_description:
 451             video_description = clean_html(video_description)
 452         else:
 453             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
 454             if fd_mobj:
 455                 video_description = unescapeHTML(fd_mobj.group(1))
 456             else:
 457                 video_description = u''
 458
 459         # subtitles
 460         video_subtitles = None
 461
 462         if self._downloader.params.get('writesubtitles', False):
 463             video_subtitles = self._extract_subtitle(video_id)
 464             if video_subtitles:
 465                 (sub_error, sub_lang, sub) = video_subtitles[0]
 466                 if sub_error:
 467                     self._downloader.report_warning(sub_error)
 468
 469         if self._downloader.params.get('writeautomaticsub', False):
 470             video_subtitles = self._request_automatic_caption(video_id, video_webpage)
 471             (sub_error, sub_lang, sub) = video_subtitles[0]
 472             if sub_error:
 473                 self._downloader.report_warning(sub_error)
 474
 475         if self._downloader.params.get('allsubtitles', False):
 476             video_subtitles = self._extract_all_subtitles(video_id)
 477             for video_subtitle in video_subtitles:
 478                 (sub_error, sub_lang, sub) = video_subtitle
 479                 if sub_error:
 480                     self._downloader.report_warning(sub_error)
 481
 482         if self._downloader.params.get('listsubtitles', False):
 483             self._list_available_subtitles(video_id)
 484             return
 485
 486         if 'length_seconds' not in video_info:
 487             self._downloader.report_warning(u'unable to extract video duration')
 488             video_duration = ''
 489         else:
 490             video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
 491
 492         # Decide which formats to download
 493         req_format = self._downloader.params.get('format', None)
 494
 495         try:
 496             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
 497             if not mobj:
 498                 raise ValueError('Could not find vevo ID')
 499             info = json.loads(mobj.group(1))
 500             args = info['args']
 501             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
 502             # this signatures are encrypted
 503             m_s = re.search(r'[&,]s=', args['url_encoded_fmt_stream_map'])
 504             if m_s is not None:
 505                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
 506                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
 507         except ValueError:
 508             pass
 509
 510         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
 511             self.report_rtmp_download()
 512             video_url_list = [(None, video_info['conn'][0])]
 513         elif 'url_encoded_fmt_stream_map' in video_info and len(video_info['url_encoded_fmt_stream_map']) >= 1:
 514             url_map = {}
 515             for url_data_str in video_info['url_encoded_fmt_stream_map'][0].split(','):
 516                 url_data = compat_parse_qs(url_data_str)
 517                 if 'itag' in url_data and 'url' in url_data:
 518                     url = url_data['url'][0]
 519                     if 'sig' in url_data:
 520                         url += '&signature=' + url_data['sig'][0]
 521                     elif 's' in url_data:
 522                         signature = self._decrypt_signature(url_data['s'][0])
 523                         url += '&signature=' + signature
 524                     if 'ratebypass' not in url:
 525                         url += '&ratebypass=yes'
 526                     url_map[url_data['itag'][0]] = url
 527
 528             format_limit = self._downloader.params.get('format_limit', None)
 529             available_formats = self._available_formats_prefer_free if self._downloader.params.get('prefer_free_formats', False) else self._available_formats
 530             if format_limit is not None and format_limit in available_formats:
 531                 format_list = available_formats[available_formats.index(format_limit):]
 532             else:
 533                 format_list = available_formats
 534             existing_formats = [x for x in format_list if x in url_map]
 535             if len(existing_formats) == 0:
 536                 raise ExtractorError(u'no known formats available for video')
 537             if self._downloader.params.get('listformats', None):
 538                 self._print_formats(existing_formats)
 539                 return
 540             if req_format is None or req_format == 'best':
 541                 video_url_list = [(existing_formats[0], url_map[existing_formats[0]])] # Best quality
 542             elif req_format == 'worst':
 543                 video_url_list = [(existing_formats[len(existing_formats)-1], url_map[existing_formats[len(existing_formats)-1]])] # worst quality
 544             elif req_format in ('-1', 'all'):
 545                 video_url_list = [(f, url_map[f]) for f in existing_formats] # All formats
 546             else:
 547                 # Specific formats. We pick the first in a slash-delimeted sequence.
 548                 # For example, if '1/2/3/4' is requested and '2' and '4' are available, we pick '2'.
 549                 req_formats = req_format.split('/')
 550                 video_url_list = None
 551                 for rf in req_formats:
 552                     if rf in url_map:
 553                         video_url_list = [(rf, url_map[rf])]
 554                         break
 555                 if video_url_list is None:
 556                     raise ExtractorError(u'requested format not available')
 557         else:
 558             raise ExtractorError(u'no conn or url_encoded_fmt_stream_map information found in video info')
 559
 560         results = []
 561         for format_param, video_real_url in video_url_list:
 562             # Extension
 563             video_extension = self._video_extensions.get(format_param, 'flv')
 564
 565             video_format = '{0} - {1}'.format(format_param if format_param else video_extension,
 566                                               self._video_dimensions.get(format_param, '???'))
 567
 568             results.append({
 569                 'id':       video_id,
 570                 'url':      video_real_url,
 571                 'uploader': video_uploader,
 572                 'uploader_id': video_uploader_id,
 573                 'upload_date':  upload_date,
 574                 'title':    video_title,
 575                 'ext':      video_extension,
 576                 'format':   video_format,
 577                 'thumbnail':    video_thumbnail,
 578                 'description':  video_description,
 579                 'player_url':   player_url,
 580                 'subtitles':    video_subtitles,
 581                 'duration':     video_duration
 582             })
 583         return results
 584
 585 class YoutubePlaylistIE(InfoExtractor):
 586     """Information Extractor for YouTube playlists."""
 587
 588     _VALID_URL = r"""(?:
 589                         (?:https?://)?
 590                         (?:\w+\.)?
 591                         youtube\.com/
 592                         (?:
 593                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
 594                            \? (?:.*?&)*? (?:p|a|list)=
 595                         |  p/
 596                         )
 597                         ((?:PL|EC|UU)?[0-9A-Za-z-_]{10,})
 598                         .*
 599                      |
 600                         ((?:PL|EC|UU)[0-9A-Za-z-_]{10,})
 601                      )"""
 602     _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/playlists/%s?max-results=%i&start-index=%i&v=2&alt=json&safeSearch=none'
 603     _MAX_RESULTS = 50
 604     IE_NAME = u'youtube:playlist'
 605
 606     @classmethod
 607     def suitable(cls, url):
 608         """Receives a URL and returns True if suitable for this IE."""
 609         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 610
 611     def _real_extract(self, url):
 612         # Extract playlist id
 613         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 614         if mobj is None:
 615             raise ExtractorError(u'Invalid URL: %s' % url)
 616
 617         # Download playlist videos from API
 618         playlist_id = mobj.group(1) or mobj.group(2)
 619         page_num = 1
 620         videos = []
 621
 622         while True:
 623             url = self._TEMPLATE_URL % (playlist_id, self._MAX_RESULTS, self._MAX_RESULTS * (page_num - 1) + 1)
 624             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
 625
 626             try:
 627                 response = json.loads(page)
 628             except ValueError as err:
 629                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
 630
 631             if 'feed' not in response:
 632                 raise ExtractorError(u'Got a malformed response from YouTube API')
 633             playlist_title = response['feed']['title']['$t']
 634             if 'entry' not in response['feed']:
 635                 # Number of videos is a multiple of self._MAX_RESULTS
 636                 break
 637
 638             for entry in response['feed']['entry']:
 639                 index = entry['yt$position']['$t']
 640                 if 'media$group' in entry and 'media$player' in entry['media$group']:
 641                     videos.append((index, entry['media$group']['media$player']['url']))
 642
 643             if len(response['feed']['entry']) < self._MAX_RESULTS:
 644                 break
 645             page_num += 1
 646
 647         videos = [v[1] for v in sorted(videos)]
 648
 649         url_results = [self.url_result(url, 'Youtube') for url in videos]
 650         return [self.playlist_result(url_results, playlist_id, playlist_title)]
 651
 652
 653 class YoutubeChannelIE(InfoExtractor):
 654     """Information Extractor for YouTube channels."""
 655
 656     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
 657     _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
 658     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
 659     _MORE_PAGES_URL = 'http://www.youtube.com/channel_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
 660     IE_NAME = u'youtube:channel'
 661
 662     def extract_videos_from_page(self, page):
 663         ids_in_page = []
 664         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
 665             if mobj.group(1) not in ids_in_page:
 666                 ids_in_page.append(mobj.group(1))
 667         return ids_in_page
 668
 669     def _real_extract(self, url):
 670         # Extract channel id
 671         mobj = re.match(self._VALID_URL, url)
 672         if mobj is None:
 673             raise ExtractorError(u'Invalid URL: %s' % url)
 674
 675         # Download channel page
 676         channel_id = mobj.group(1)
 677         video_ids = []
 678         pagenum = 1
 679
 680         url = self._TEMPLATE_URL % (channel_id, pagenum)
 681         page = self._download_webpage(url, channel_id,
 682                                       u'Downloading page #%s' % pagenum)
 683
 684         # Extract video identifiers
 685         ids_in_page = self.extract_videos_from_page(page)
 686         video_ids.extend(ids_in_page)
 687
 688         # Download any subsequent channel pages using the json-based channel_ajax query
 689         if self._MORE_PAGES_INDICATOR in page:
 690             while True:
 691                 pagenum = pagenum + 1
 692
 693                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
 694                 page = self._download_webpage(url, channel_id,
 695                                               u'Downloading page #%s' % pagenum)
 696
 697                 page = json.loads(page)
 698
 699                 ids_in_page = self.extract_videos_from_page(page['content_html'])
 700                 video_ids.extend(ids_in_page)
 701
 702                 if self._MORE_PAGES_INDICATOR  not in page['load_more_widget_html']:
 703                     break
 704
 705         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
 706
 707         urls = ['http://www.youtube.com/watch?v=%s' % id for id in video_ids]
 708         url_entries = [self.url_result(url, 'Youtube') for url in urls]
 709         return [self.playlist_result(url_entries, channel_id)]
 710
 711
 712 class YoutubeUserIE(InfoExtractor):
 713     """Information Extractor for YouTube users."""
 714
 715     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/user/)|ytuser:)([A-Za-z0-9_-]+)'
 716     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
 717     _GDATA_PAGE_SIZE = 50
 718     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d'
 719     _VIDEO_INDICATOR = r'/watch\?v=(.+?)[\<&]'
 720     IE_NAME = u'youtube:user'
 721
 722     def _real_extract(self, url):
 723         # Extract username
 724         mobj = re.match(self._VALID_URL, url)
 725         if mobj is None:
 726             raise ExtractorError(u'Invalid URL: %s' % url)
 727
 728         username = mobj.group(1)
 729
 730         # Download video ids using YouTube Data API. Result size per
 731         # query is limited (currently to 50 videos) so we need to query
 732         # page by page until there are no video ids - it means we got
 733         # all of them.
 734
 735         video_ids = []
 736         pagenum = 0
 737
 738         while True:
 739             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
 740
 741             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
 742             page = self._download_webpage(gdata_url, username,
 743                                           u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
 744
 745             # Extract video identifiers
 746             ids_in_page = []
 747
 748             for mobj in re.finditer(self._VIDEO_INDICATOR, page):
 749                 if mobj.group(1) not in ids_in_page:
 750                     ids_in_page.append(mobj.group(1))
 751
 752             video_ids.extend(ids_in_page)
 753
 754             # A little optimization - if current page is not
 755             # "full", ie. does not contain PAGE_SIZE video ids then
 756             # we can assume that this page is the last one - there
 757             # are no more ids on further pages - no need to query
 758             # again.
 759
 760             if len(ids_in_page) < self._GDATA_PAGE_SIZE:
 761                 break
 762
 763             pagenum += 1
 764
 765         urls = ['http://www.youtube.com/watch?v=%s' % video_id for video_id in video_ids]
 766         url_results = [self.url_result(url, 'Youtube') for url in urls]
 767         return [self.playlist_result(url_results, playlist_title = username)]
 768
 769 class YoutubeSearchIE(SearchInfoExtractor):
 770     """Information Extractor for YouTube search queries."""
 771     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
 772     _MAX_RESULTS = 1000
 773     IE_NAME = u'youtube:search'
 774     _SEARCH_KEY = 'ytsearch'
 775
 776     def report_download_page(self, query, pagenum):
 777         """Report attempt to download search page with given number."""
 778         self._downloader.to_screen(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
 779
 780     def _get_n_results(self, query, n):
 781         """Get a specified number of results for a query"""
 782
 783         video_ids = []
 784         pagenum = 0
 785         limit = n
 786
 787         while (50 * pagenum) < limit:
 788             self.report_download_page(query, pagenum+1)
 789             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
 790             request = compat_urllib_request.Request(result_url)
 791             try:
 792                 data = compat_urllib_request.urlopen(request).read().decode('utf-8')
 793             except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 794                 raise ExtractorError(u'Unable to download API page: %s' % compat_str(err))
 795             api_response = json.loads(data)['data']
 796
 797             if not 'items' in api_response:
 798                 raise ExtractorError(u'[youtube] No video results')
 799
 800             new_ids = list(video['id'] for video in api_response['items'])
 801             video_ids += new_ids
 802
 803             limit = min(n, api_response['totalItems'])
 804             pagenum += 1
 805
 806         if len(video_ids) > n:
 807             video_ids = video_ids[:n]
 808         videos = [self.url_result('http://www.youtube.com/watch?v=%s' % id, 'Youtube') for id in video_ids]
 809         return self.playlist_result(videos, query)