_ 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 import itertools
   8
   9 from .common import InfoExtractor, SearchInfoExtractor
  10 from ..utils import (
  11     compat_http_client,
  12     compat_parse_qs,
  13     compat_urllib_error,
  14     compat_urllib_parse,
  15     compat_urllib_request,
  16     compat_str,
  17
  18     clean_html,
  19     get_element_by_id,
  20     ExtractorError,
  21     unescapeHTML,
  22     unified_strdate,
  23     orderedSet,
  24 )
  25
  26
  27 class YoutubeIE(InfoExtractor):
  28     IE_DESC = u'YouTube.com'
  29     _VALID_URL = r"""^
  30                      (
  31                          (?:https?://)?                                       # http(s):// (optional)
  32                          (?:youtu\.be/|(?:\w+\.)?youtube(?:-nocookie)?\.com/|
  33                             tube\.majestyc\.net/)                             # the various hostnames, with wildcard subdomains
  34                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
  35                          (?:                                                  # the various things that can precede the ID:
  36                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
  37                              |(?:                                             # or the v= param in all its forms
  38                                  (?:watch|movie(?:_popup)?(?:\.php)?)?              # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
  39                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
  40                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
  41                                  v=
  42                              )
  43                          )?                                                   # optional -> youtube.com/xxxx is OK
  44                      )?                                                       # all until now is optional -> you can pass the naked ID
  45                      ([0-9A-Za-z_-]+)                                         # here is it! the YouTube video ID
  46                      (?(1).+)?                                                # if we found the ID, everything can follow
  47                      $"""
  48     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
  49     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  50     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
  51     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
  52     _NETRC_MACHINE = 'youtube'
  53     # Listed in order of quality
  54     _available_formats = ['38', '37', '46', '22', '45', '35', '44', '34', '18', '43', '6', '5', '17', '13']
  55     _available_formats_prefer_free = ['38', '46', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '17', '13']
  56     _video_extensions = {
  57         '13': '3gp',
  58         '17': 'mp4',
  59         '18': 'mp4',
  60         '22': 'mp4',
  61         '37': 'mp4',
  62         '38': 'mp4',
  63         '43': 'webm',
  64         '44': 'webm',
  65         '45': 'webm',
  66         '46': 'webm',
  67     }
  68     _video_dimensions = {
  69         '5': '240x400',
  70         '6': '???',
  71         '13': '???',
  72         '17': '144x176',
  73         '18': '360x640',
  74         '22': '720x1280',
  75         '34': '360x640',
  76         '35': '480x854',
  77         '37': '1080x1920',
  78         '38': '3072x4096',
  79         '43': '360x640',
  80         '44': '480x854',
  81         '45': '720x1280',
  82         '46': '1080x1920',
  83     }
  84     IE_NAME = u'youtube'
  85     _TESTS = [
  86         {
  87             u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
  88             u"file":  u"BaW_jenozKc.mp4",
  89             u"info_dict": {
  90                 u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
  91                 u"uploader": u"Philipp Hagemeister",
  92                 u"uploader_id": u"phihag",
  93                 u"upload_date": u"20121002",
  94                 u"description": u"test chars:  \"'/\\ä↭𝕐\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de ."
  95             }
  96         },
  97         {
  98             u"url":  u"http://www.youtube.com/watch?v=1ltcDfZMA3U",
  99             u"file":  u"1ltcDfZMA3U.flv",
 100             u"note": u"Test VEVO video (#897)",
 101             u"info_dict": {
 102                 u"upload_date": u"20070518",
 103                 u"title": u"Maps - It Will Find You",
 104                 u"description": u"Music video by Maps performing It Will Find You.",
 105                 u"uploader": u"MuteUSA",
 106                 u"uploader_id": u"MuteUSA"
 107             }
 108         },
 109         {
 110             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
 111             u"file":  u"UxxajLWwzqY.mp4",
 112             u"note": u"Test generic use_cipher_signature video (#897)",
 113             u"info_dict": {
 114                 u"upload_date": u"20120506",
 115                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
 116                 u"description": u"md5:b085c9804f5ab69f4adea963a2dceb3c",
 117                 u"uploader": u"IconaPop",
 118                 u"uploader_id": u"IconaPop"
 119             }
 120         }
 121     ]
 122
 123
 124     @classmethod
 125     def suitable(cls, url):
 126         """Receives a URL and returns True if suitable for this IE."""
 127         if YoutubePlaylistIE.suitable(url) or YoutubeSubscriptionsIE.suitable(url): return False
 128         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 129
 130     def report_lang(self):
 131         """Report attempt to set language."""
 132         self.to_screen(u'Setting language')
 133
 134     def report_login(self):
 135         """Report attempt to log in."""
 136         self.to_screen(u'Logging in')
 137
 138     def report_video_webpage_download(self, video_id):
 139         """Report attempt to download video webpage."""
 140         self.to_screen(u'%s: Downloading video webpage' % video_id)
 141
 142     def report_video_info_webpage_download(self, video_id):
 143         """Report attempt to download video info webpage."""
 144         self.to_screen(u'%s: Downloading video info webpage' % video_id)
 145
 146     def report_video_subtitles_download(self, video_id):
 147         """Report attempt to download video info webpage."""
 148         self.to_screen(u'%s: Checking available subtitles' % video_id)
 149
 150     def report_video_subtitles_request(self, video_id, sub_lang, format):
 151         """Report attempt to download video info webpage."""
 152         self.to_screen(u'%s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
 153
 154     def report_video_subtitles_available(self, video_id, sub_lang_list):
 155         """Report available subtitles."""
 156         sub_lang = ",".join(list(sub_lang_list.keys()))
 157         self.to_screen(u'%s: Available subtitles for video: %s' % (video_id, sub_lang))
 158
 159     def report_information_extraction(self, video_id):
 160         """Report attempt to extract video information."""
 161         self.to_screen(u'%s: Extracting video information' % video_id)
 162
 163     def report_unavailable_format(self, video_id, format):
 164         """Report extracted video URL."""
 165         self.to_screen(u'%s: Format %s not available' % (video_id, format))
 166
 167     def report_rtmp_download(self):
 168         """Indicate the download will use the RTMP protocol."""
 169         self.to_screen(u'RTMP download detected')
 170
 171     def _decrypt_signature(self, s):
 172         """Turn the encrypted s field into a working signature"""
 173
 174         if len(s) == 88:
 175             return s[48] + s[81:67:-1] + s[82] + s[66:62:-1] + s[85] + s[61:48:-1] + s[67] + s[47:12:-1] + s[3] + s[11:3:-1] + s[2] + s[12]
 176         elif len(s) == 87:
 177             return s[62] + s[82:62:-1] + s[83] + s[61:52:-1] + s[0] + s[51:2:-1]
 178         elif len(s) == 86:
 179             return s[2:63] + s[82] + s[64:82] + s[63]
 180         elif len(s) == 85:
 181             return s[76] + s[82:76:-1] + s[83] + s[75:60:-1] + s[0] + s[59:50:-1] + s[1] + s[49:2:-1]
 182         elif len(s) == 84:
 183             return s[83:36:-1] + s[2] + s[35:26:-1] + s[3] + s[25:3:-1] + s[26]
 184         elif len(s) == 83:
 185             return s[52] + s[81:55:-1] + s[2] + s[54:52:-1] + s[82] + s[51:36:-1] + s[55] + s[35:2:-1] + s[36]
 186         elif len(s) == 82:
 187             return s[36] + s[79:67:-1] + s[81] + s[66:40:-1] + s[33] + s[39:36:-1] + s[40] + s[35] + s[0] + s[67] + s[32:0:-1] + s[34]
 188
 189         else:
 190             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
 191
 192     def _get_available_subtitles(self, video_id):
 193         self.report_video_subtitles_download(video_id)
 194         request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
 195         try:
 196             sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
 197         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 198             return (u'unable to download video subtitles: %s' % compat_str(err), None)
 199         sub_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
 200         sub_lang_list = dict((l[1], l[0]) for l in sub_lang_list)
 201         if not sub_lang_list:
 202             return (u'video doesn\'t have subtitles', None)
 203         return sub_lang_list
 204
 205     def _list_available_subtitles(self, video_id):
 206         sub_lang_list = self._get_available_subtitles(video_id)
 207         self.report_video_subtitles_available(video_id, sub_lang_list)
 208
 209     def _request_subtitle(self, sub_lang, sub_name, video_id, format):
 210         """
 211         Return tuple:
 212         (error_message, sub_lang, sub)
 213         """
 214         self.report_video_subtitles_request(video_id, sub_lang, format)
 215         params = compat_urllib_parse.urlencode({
 216             'lang': sub_lang,
 217             'name': sub_name,
 218             'v': video_id,
 219             'fmt': format,
 220         })
 221         url = 'http://www.youtube.com/api/timedtext?' + params
 222         try:
 223             sub = compat_urllib_request.urlopen(url).read().decode('utf-8')
 224         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 225             return (u'unable to download video subtitles: %s' % compat_str(err), None, None)
 226         if not sub:
 227             return (u'Did not fetch video subtitles', None, None)
 228         return (None, sub_lang, sub)
 229
 230     def _request_automatic_caption(self, video_id, webpage):
 231         """We need the webpage for getting the captions url, pass it as an
 232            argument to speed up the process."""
 233         sub_lang = self._downloader.params.get('subtitleslang') or 'en'
 234         sub_format = self._downloader.params.get('subtitlesformat')
 235         self.to_screen(u'%s: Looking for automatic captions' % video_id)
 236         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
 237         err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
 238         if mobj is None:
 239             return [(err_msg, None, None)]
 240         player_config = json.loads(mobj.group(1))
 241         try:
 242             args = player_config[u'args']
 243             caption_url = args[u'ttsurl']
 244             timestamp = args[u'timestamp']
 245             params = compat_urllib_parse.urlencode({
 246                 'lang': 'en',
 247                 'tlang': sub_lang,
 248                 'fmt': sub_format,
 249                 'ts': timestamp,
 250                 'kind': 'asr',
 251             })
 252             subtitles_url = caption_url + '&' + params
 253             sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
 254             return [(None, sub_lang, sub)]
 255         except KeyError:
 256             return [(err_msg, None, None)]
 257
 258     def _extract_subtitle(self, video_id):
 259         """
 260         Return a list with a tuple:
 261         [(error_message, sub_lang, sub)]
 262         """
 263         sub_lang_list = self._get_available_subtitles(video_id)
 264         sub_format = self._downloader.params.get('subtitlesformat')
 265         if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
 266             return [(sub_lang_list[0], None, None)]
 267         if self._downloader.params.get('subtitleslang', False):
 268             sub_lang = self._downloader.params.get('subtitleslang')
 269         elif 'en' in sub_lang_list:
 270             sub_lang = 'en'
 271         else:
 272             sub_lang = list(sub_lang_list.keys())[0]
 273         if not sub_lang in sub_lang_list:
 274             return [(u'no closed captions found in the specified language "%s"' % sub_lang, None, None)]
 275
 276         subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
 277         return [subtitle]
 278
 279     def _extract_all_subtitles(self, video_id):
 280         sub_lang_list = self._get_available_subtitles(video_id)
 281         sub_format = self._downloader.params.get('subtitlesformat')
 282         if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
 283             return [(sub_lang_list[0], None, None)]
 284         subtitles = []
 285         for sub_lang in sub_lang_list:
 286             subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
 287             subtitles.append(subtitle)
 288         return subtitles
 289
 290     def _print_formats(self, formats):
 291         print('Available formats:')
 292         for x in formats:
 293             print('%s\t:\t%s\t[%s]' %(x, self._video_extensions.get(x, 'flv'), self._video_dimensions.get(x, '???')))
 294
 295     def _real_initialize(self):
 296         if self._downloader is None:
 297             return
 298
 299         username = None
 300         password = None
 301         downloader_params = self._downloader.params
 302
 303         # Attempt to use provided username and password or .netrc data
 304         if downloader_params.get('username', None) is not None:
 305             username = downloader_params['username']
 306             password = downloader_params['password']
 307         elif downloader_params.get('usenetrc', False):
 308             try:
 309                 info = netrc.netrc().authenticators(self._NETRC_MACHINE)
 310                 if info is not None:
 311                     username = info[0]
 312                     password = info[2]
 313                 else:
 314                     raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
 315             except (IOError, netrc.NetrcParseError) as err:
 316                 self._downloader.report_warning(u'parsing .netrc: %s' % compat_str(err))
 317                 return
 318
 319         # Set language
 320         request = compat_urllib_request.Request(self._LANG_URL)
 321         try:
 322             self.report_lang()
 323             compat_urllib_request.urlopen(request).read()
 324         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 325             self._downloader.report_warning(u'unable to set language: %s' % compat_str(err))
 326             return
 327
 328         # No authentication to be performed
 329         if username is None:
 330             return
 331
 332         request = compat_urllib_request.Request(self._LOGIN_URL)
 333         try:
 334             login_page = compat_urllib_request.urlopen(request).read().decode('utf-8')
 335         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 336             self._downloader.report_warning(u'unable to fetch login page: %s' % compat_str(err))
 337             return
 338
 339         galx = None
 340         dsh = None
 341         match = re.search(re.compile(r'<input.+?name="GALX".+?value="(.+?)"', re.DOTALL), login_page)
 342         if match:
 343           galx = match.group(1)
 344
 345         match = re.search(re.compile(r'<input.+?name="dsh".+?value="(.+?)"', re.DOTALL), login_page)
 346         if match:
 347           dsh = match.group(1)
 348
 349         # Log in
 350         login_form_strs = {
 351                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
 352                 u'Email': username,
 353                 u'GALX': galx,
 354                 u'Passwd': password,
 355                 u'PersistentCookie': u'yes',
 356                 u'_utf8': u'霱',
 357                 u'bgresponse': u'js_disabled',
 358                 u'checkConnection': u'',
 359                 u'checkedDomains': u'youtube',
 360                 u'dnConn': u'',
 361                 u'dsh': dsh,
 362                 u'pstMsg': u'0',
 363                 u'rmShown': u'1',
 364                 u'secTok': u'',
 365                 u'signIn': u'Sign in',
 366                 u'timeStmp': u'',
 367                 u'service': u'youtube',
 368                 u'uilel': u'3',
 369                 u'hl': u'en_US',
 370         }
 371         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
 372         # chokes on unicode
 373         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
 374         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
 375         request = compat_urllib_request.Request(self._LOGIN_URL, login_data)
 376         try:
 377             self.report_login()
 378             login_results = compat_urllib_request.urlopen(request).read().decode('utf-8')
 379             if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
 380                 self._downloader.report_warning(u'unable to log in: bad username or password')
 381                 return
 382         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 383             self._downloader.report_warning(u'unable to log in: %s' % compat_str(err))
 384             return
 385
 386         # Confirm age
 387         age_form = {
 388                 'next_url':     '/',
 389                 'action_confirm':   'Confirm',
 390                 }
 391         request = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
 392         try:
 393             self.report_age_confirmation()
 394             compat_urllib_request.urlopen(request).read().decode('utf-8')
 395         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 396             raise ExtractorError(u'Unable to confirm age: %s' % compat_str(err))
 397
 398     def _extract_id(self, url):
 399         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 400         if mobj is None:
 401             raise ExtractorError(u'Invalid URL: %s' % url)
 402         video_id = mobj.group(2)
 403         return video_id
 404
 405     def _real_extract(self, url):
 406         if re.match(r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$', url):
 407             self._downloader.report_warning(u'Did you forget to quote the URL? Remember that & is a meta-character in most shells, so you want to put the URL in quotes, like  youtube-dl \'http://www.youtube.com/watch?feature=foo&v=BaW_jenozKc\' (or simply  youtube-dl BaW_jenozKc  ).')
 408
 409         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
 410         mobj = re.search(self._NEXT_URL_RE, url)
 411         if mobj:
 412             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
 413         video_id = self._extract_id(url)
 414
 415         # Get video webpage
 416         self.report_video_webpage_download(video_id)
 417         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
 418         request = compat_urllib_request.Request(url)
 419         try:
 420             video_webpage_bytes = compat_urllib_request.urlopen(request).read()
 421         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 422             raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err))
 423
 424         video_webpage = video_webpage_bytes.decode('utf-8', 'ignore')
 425
 426         # Attempt to extract SWF player URL
 427         mobj = re.search(r'swfConfig.*?"(http:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
 428         if mobj is not None:
 429             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
 430         else:
 431             player_url = None
 432
 433         # Get video info
 434         self.report_video_info_webpage_download(video_id)
 435         for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
 436             video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
 437                     % (video_id, el_type))
 438             video_info_webpage = self._download_webpage(video_info_url, video_id,
 439                                     note=False,
 440                                     errnote='unable to download video info webpage')
 441             video_info = compat_parse_qs(video_info_webpage)
 442             if 'token' in video_info:
 443                 break
 444         if 'token' not in video_info:
 445             if 'reason' in video_info:
 446                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0], expected=True)
 447             else:
 448                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
 449
 450         # Check for "rental" videos
 451         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
 452             raise ExtractorError(u'"rental" videos not supported')
 453
 454         # Start extracting information
 455         self.report_information_extraction(video_id)
 456
 457         # uploader
 458         if 'author' not in video_info:
 459             raise ExtractorError(u'Unable to extract uploader name')
 460         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
 461
 462         # uploader_id
 463         video_uploader_id = None
 464         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
 465         if mobj is not None:
 466             video_uploader_id = mobj.group(1)
 467         else:
 468             self._downloader.report_warning(u'unable to extract uploader nickname')
 469
 470         # title
 471         if 'title' not in video_info:
 472             raise ExtractorError(u'Unable to extract video title')
 473         video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
 474
 475         # thumbnail image
 476         if 'thumbnail_url' not in video_info:
 477             self._downloader.report_warning(u'unable to extract video thumbnail')
 478             video_thumbnail = ''
 479         else:   # don't panic if we can't find it
 480             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
 481
 482         # upload date
 483         upload_date = None
 484         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
 485         if mobj is not None:
 486             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
 487             upload_date = unified_strdate(upload_date)
 488
 489         # description
 490         video_description = get_element_by_id("eow-description", video_webpage)
 491         if video_description:
 492             video_description = clean_html(video_description)
 493         else:
 494             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
 495             if fd_mobj:
 496                 video_description = unescapeHTML(fd_mobj.group(1))
 497             else:
 498                 video_description = u''
 499
 500         # subtitles
 501         video_subtitles = None
 502
 503         if self._downloader.params.get('writesubtitles', False):
 504             video_subtitles = self._extract_subtitle(video_id)
 505             if video_subtitles:
 506                 (sub_error, sub_lang, sub) = video_subtitles[0]
 507                 if sub_error:
 508                     self._downloader.report_warning(sub_error)
 509
 510         if self._downloader.params.get('writeautomaticsub', False):
 511             video_subtitles = self._request_automatic_caption(video_id, video_webpage)
 512             (sub_error, sub_lang, sub) = video_subtitles[0]
 513             if sub_error:
 514                 self._downloader.report_warning(sub_error)
 515
 516         if self._downloader.params.get('allsubtitles', False):
 517             video_subtitles = self._extract_all_subtitles(video_id)
 518             for video_subtitle in video_subtitles:
 519                 (sub_error, sub_lang, sub) = video_subtitle
 520                 if sub_error:
 521                     self._downloader.report_warning(sub_error)
 522
 523         if self._downloader.params.get('listsubtitles', False):
 524             self._list_available_subtitles(video_id)
 525             return
 526
 527         if 'length_seconds' not in video_info:
 528             self._downloader.report_warning(u'unable to extract video duration')
 529             video_duration = ''
 530         else:
 531             video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
 532
 533         # Decide which formats to download
 534         req_format = self._downloader.params.get('format', None)
 535
 536         try:
 537             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
 538             if not mobj:
 539                 raise ValueError('Could not find vevo ID')
 540             info = json.loads(mobj.group(1))
 541             args = info['args']
 542             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
 543             # this signatures are encrypted
 544             m_s = re.search(r'[&,]s=', args['url_encoded_fmt_stream_map'])
 545             if m_s is not None:
 546                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
 547                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
 548         except ValueError:
 549             pass
 550
 551         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
 552             self.report_rtmp_download()
 553             video_url_list = [(None, video_info['conn'][0])]
 554         elif 'url_encoded_fmt_stream_map' in video_info and len(video_info['url_encoded_fmt_stream_map']) >= 1:
 555             url_map = {}
 556             for url_data_str in video_info['url_encoded_fmt_stream_map'][0].split(','):
 557                 url_data = compat_parse_qs(url_data_str)
 558                 if 'itag' in url_data and 'url' in url_data:
 559                     url = url_data['url'][0]
 560                     if 'sig' in url_data:
 561                         url += '&signature=' + url_data['sig'][0]
 562                     elif 's' in url_data:
 563                         if self._downloader.params.get('verbose'):
 564                             s = url_data['s'][0]
 565                             player = self._search_regex(r'html5player-(.+?)\.js', video_webpage,
 566                                 'html5 player', fatal=False)
 567                             self.to_screen('encrypted signature length %d (%d.%d), itag %s, html5 player %s' %
 568                                 (len(s), len(s.split('.')[0]), len(s.split('.')[1]), url_data['itag'][0], player))
 569                         signature = self._decrypt_signature(url_data['s'][0])
 570                         url += '&signature=' + signature
 571                     if 'ratebypass' not in url:
 572                         url += '&ratebypass=yes'
 573                     url_map[url_data['itag'][0]] = url
 574
 575             format_limit = self._downloader.params.get('format_limit', None)
 576             available_formats = self._available_formats_prefer_free if self._downloader.params.get('prefer_free_formats', False) else self._available_formats
 577             if format_limit is not None and format_limit in available_formats:
 578                 format_list = available_formats[available_formats.index(format_limit):]
 579             else:
 580                 format_list = available_formats
 581             existing_formats = [x for x in format_list if x in url_map]
 582             if len(existing_formats) == 0:
 583                 raise ExtractorError(u'no known formats available for video')
 584             if self._downloader.params.get('listformats', None):
 585                 self._print_formats(existing_formats)
 586                 return
 587             if req_format is None or req_format == 'best':
 588                 video_url_list = [(existing_formats[0], url_map[existing_formats[0]])] # Best quality
 589             elif req_format == 'worst':
 590                 video_url_list = [(existing_formats[-1], url_map[existing_formats[-1]])] # worst quality
 591             elif req_format in ('-1', 'all'):
 592                 video_url_list = [(f, url_map[f]) for f in existing_formats] # All formats
 593             else:
 594                 # Specific formats. We pick the first in a slash-delimeted sequence.
 595                 # For example, if '1/2/3/4' is requested and '2' and '4' are available, we pick '2'.
 596                 req_formats = req_format.split('/')
 597                 video_url_list = None
 598                 for rf in req_formats:
 599                     if rf in url_map:
 600                         video_url_list = [(rf, url_map[rf])]
 601                         break
 602                 if video_url_list is None:
 603                     raise ExtractorError(u'requested format not available')
 604         else:
 605             raise ExtractorError(u'no conn or url_encoded_fmt_stream_map information found in video info')
 606
 607         results = []
 608         for format_param, video_real_url in video_url_list:
 609             # Extension
 610             video_extension = self._video_extensions.get(format_param, 'flv')
 611
 612             video_format = '{0} - {1}'.format(format_param if format_param else video_extension,
 613                                               self._video_dimensions.get(format_param, '???'))
 614
 615             results.append({
 616                 'id':       video_id,
 617                 'url':      video_real_url,
 618                 'uploader': video_uploader,
 619                 'uploader_id': video_uploader_id,
 620                 'upload_date':  upload_date,
 621                 'title':    video_title,
 622                 'ext':      video_extension,
 623                 'format':   video_format,
 624                 'thumbnail':    video_thumbnail,
 625                 'description':  video_description,
 626                 'player_url':   player_url,
 627                 'subtitles':    video_subtitles,
 628                 'duration':     video_duration
 629             })
 630         return results
 631
 632 class YoutubePlaylistIE(InfoExtractor):
 633     IE_DESC = u'YouTube.com playlists'
 634     _VALID_URL = r"""(?:
 635                         (?:https?://)?
 636                         (?:\w+\.)?
 637                         youtube\.com/
 638                         (?:
 639                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
 640                            \? (?:.*?&)*? (?:p|a|list)=
 641                         |  p/
 642                         )
 643                         ((?:PL|EC|UU)?[0-9A-Za-z-_]{10,})
 644                         .*
 645                      |
 646                         ((?:PL|EC|UU)[0-9A-Za-z-_]{10,})
 647                      )"""
 648     _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/playlists/%s?max-results=%i&start-index=%i&v=2&alt=json&safeSearch=none'
 649     _MAX_RESULTS = 50
 650     IE_NAME = u'youtube:playlist'
 651
 652     @classmethod
 653     def suitable(cls, url):
 654         """Receives a URL and returns True if suitable for this IE."""
 655         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 656
 657     def _real_extract(self, url):
 658         # Extract playlist id
 659         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 660         if mobj is None:
 661             raise ExtractorError(u'Invalid URL: %s' % url)
 662
 663         # Download playlist videos from API
 664         playlist_id = mobj.group(1) or mobj.group(2)
 665         page_num = 1
 666         videos = []
 667
 668         while True:
 669             url = self._TEMPLATE_URL % (playlist_id, self._MAX_RESULTS, self._MAX_RESULTS * (page_num - 1) + 1)
 670             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
 671
 672             try:
 673                 response = json.loads(page)
 674             except ValueError as err:
 675                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
 676
 677             if 'feed' not in response:
 678                 raise ExtractorError(u'Got a malformed response from YouTube API')
 679             playlist_title = response['feed']['title']['$t']
 680             if 'entry' not in response['feed']:
 681                 # Number of videos is a multiple of self._MAX_RESULTS
 682                 break
 683
 684             for entry in response['feed']['entry']:
 685                 index = entry['yt$position']['$t']
 686                 if 'media$group' in entry and 'media$player' in entry['media$group']:
 687                     videos.append((index, entry['media$group']['media$player']['url']))
 688
 689             if len(response['feed']['entry']) < self._MAX_RESULTS:
 690                 break
 691             page_num += 1
 692
 693         videos = [v[1] for v in sorted(videos)]
 694
 695         url_results = [self.url_result(url, 'Youtube') for url in videos]
 696         return [self.playlist_result(url_results, playlist_id, playlist_title)]
 697
 698
 699 class YoutubeChannelIE(InfoExtractor):
 700     IE_DESC = u'YouTube.com channels'
 701     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
 702     _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
 703     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
 704     _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'
 705     IE_NAME = u'youtube:channel'
 706
 707     def extract_videos_from_page(self, page):
 708         ids_in_page = []
 709         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
 710             if mobj.group(1) not in ids_in_page:
 711                 ids_in_page.append(mobj.group(1))
 712         return ids_in_page
 713
 714     def _real_extract(self, url):
 715         # Extract channel id
 716         mobj = re.match(self._VALID_URL, url)
 717         if mobj is None:
 718             raise ExtractorError(u'Invalid URL: %s' % url)
 719
 720         # Download channel page
 721         channel_id = mobj.group(1)
 722         video_ids = []
 723         pagenum = 1
 724
 725         url = self._TEMPLATE_URL % (channel_id, pagenum)
 726         page = self._download_webpage(url, channel_id,
 727                                       u'Downloading page #%s' % pagenum)
 728
 729         # Extract video identifiers
 730         ids_in_page = self.extract_videos_from_page(page)
 731         video_ids.extend(ids_in_page)
 732
 733         # Download any subsequent channel pages using the json-based channel_ajax query
 734         if self._MORE_PAGES_INDICATOR in page:
 735             while True:
 736                 pagenum = pagenum + 1
 737
 738                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
 739                 page = self._download_webpage(url, channel_id,
 740                                               u'Downloading page #%s' % pagenum)
 741
 742                 page = json.loads(page)
 743
 744                 ids_in_page = self.extract_videos_from_page(page['content_html'])
 745                 video_ids.extend(ids_in_page)
 746
 747                 if self._MORE_PAGES_INDICATOR  not in page['load_more_widget_html']:
 748                     break
 749
 750         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
 751
 752         urls = ['http://www.youtube.com/watch?v=%s' % id for id in video_ids]
 753         url_entries = [self.url_result(url, 'Youtube') for url in urls]
 754         return [self.playlist_result(url_entries, channel_id)]
 755
 756
 757 class YoutubeUserIE(InfoExtractor):
 758     IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
 759     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/user/)|ytuser:)([A-Za-z0-9_-]+)'
 760     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
 761     _GDATA_PAGE_SIZE = 50
 762     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d'
 763     _VIDEO_INDICATOR = r'/watch\?v=(.+?)[\<&]'
 764     IE_NAME = u'youtube:user'
 765
 766     def _real_extract(self, url):
 767         # Extract username
 768         mobj = re.match(self._VALID_URL, url)
 769         if mobj is None:
 770             raise ExtractorError(u'Invalid URL: %s' % url)
 771
 772         username = mobj.group(1)
 773
 774         # Download video ids using YouTube Data API. Result size per
 775         # query is limited (currently to 50 videos) so we need to query
 776         # page by page until there are no video ids - it means we got
 777         # all of them.
 778
 779         video_ids = []
 780         pagenum = 0
 781
 782         while True:
 783             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
 784
 785             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
 786             page = self._download_webpage(gdata_url, username,
 787                                           u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
 788
 789             # Extract video identifiers
 790             ids_in_page = []
 791
 792             for mobj in re.finditer(self._VIDEO_INDICATOR, page):
 793                 if mobj.group(1) not in ids_in_page:
 794                     ids_in_page.append(mobj.group(1))
 795
 796             video_ids.extend(ids_in_page)
 797
 798             # A little optimization - if current page is not
 799             # "full", ie. does not contain PAGE_SIZE video ids then
 800             # we can assume that this page is the last one - there
 801             # are no more ids on further pages - no need to query
 802             # again.
 803
 804             if len(ids_in_page) < self._GDATA_PAGE_SIZE:
 805                 break
 806
 807             pagenum += 1
 808
 809         urls = ['http://www.youtube.com/watch?v=%s' % video_id for video_id in video_ids]
 810         url_results = [self.url_result(url, 'Youtube') for url in urls]
 811         return [self.playlist_result(url_results, playlist_title = username)]
 812
 813 class YoutubeSearchIE(SearchInfoExtractor):
 814     IE_DESC = u'YouTube.com searches'
 815     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
 816     _MAX_RESULTS = 1000
 817     IE_NAME = u'youtube:search'
 818     _SEARCH_KEY = 'ytsearch'
 819
 820     def report_download_page(self, query, pagenum):
 821         """Report attempt to download search page with given number."""
 822         self._downloader.to_screen(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
 823
 824     def _get_n_results(self, query, n):
 825         """Get a specified number of results for a query"""
 826
 827         video_ids = []
 828         pagenum = 0
 829         limit = n
 830
 831         while (50 * pagenum) < limit:
 832             self.report_download_page(query, pagenum+1)
 833             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
 834             request = compat_urllib_request.Request(result_url)
 835             try:
 836                 data = compat_urllib_request.urlopen(request).read().decode('utf-8')
 837             except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 838                 raise ExtractorError(u'Unable to download API page: %s' % compat_str(err))
 839             api_response = json.loads(data)['data']
 840
 841             if not 'items' in api_response:
 842                 raise ExtractorError(u'[youtube] No video results')
 843
 844             new_ids = list(video['id'] for video in api_response['items'])
 845             video_ids += new_ids
 846
 847             limit = min(n, api_response['totalItems'])
 848             pagenum += 1
 849
 850         if len(video_ids) > n:
 851             video_ids = video_ids[:n]
 852         videos = [self.url_result('http://www.youtube.com/watch?v=%s' % id, 'Youtube') for id in video_ids]
 853         return self.playlist_result(videos, query)
 854
 855
 856 class YoutubeShowIE(InfoExtractor):
 857     IE_DESC = u'YouTube.com (multi-season) shows'
 858     _VALID_URL = r'https?://www\.youtube\.com/show/(.*)'
 859     IE_NAME = u'youtube:show'
 860
 861     def _real_extract(self, url):
 862         mobj = re.match(self._VALID_URL, url)
 863         show_name = mobj.group(1)
 864         webpage = self._download_webpage(url, show_name, u'Downloading show webpage')
 865         # There's one playlist for each season of the show
 866         m_seasons = list(re.finditer(r'href="(/playlist\?list=.*?)"', webpage))
 867         self.to_screen(u'%s: Found %s seasons' % (show_name, len(m_seasons)))
 868         return [self.url_result('https://www.youtube.com' + season.group(1), 'YoutubePlaylist') for season in m_seasons]
 869
 870
 871 class YoutubeSubscriptionsIE(YoutubeIE):
 872     """It's a subclass of YoutubeIE because we need to login"""
 873     IE_DESC = u'YouTube.com subscriptions feed, "ytsubscriptions" keyword(requires authentication)'
 874     _VALID_URL = r'https?://www\.youtube\.com/feed/subscriptions|ytsubscriptions'
 875     IE_NAME = u'youtube:subscriptions'
 876     _FEED_TEMPLATE = 'http://www.youtube.com/feed_ajax?action_load_system_feed=1&feed_name=subscriptions&paging=%s'
 877     _PAGING_STEP = 30
 878
 879     _TESTS = []
 880
 881     @classmethod
 882     def suitable(cls, url):
 883         return re.match(cls._VALID_URL, url) is not None
 884
 885     def _real_extract(self, url):
 886         feed_entries = []
 887         # The step argument is available only in 2.7 or higher
 888         for i in itertools.count(0):
 889             paging = i*self._PAGING_STEP
 890             info = self._download_webpage(self._FEED_TEMPLATE % paging, 'feed',
 891                                           u'Downloading page %s' % i)
 892             info = json.loads(info)
 893             feed_html = info['feed_html']
 894             m_ids = re.finditer(r'"/watch\?v=(.*?)"', feed_html)
 895             ids = orderedSet(m.group(1) for m in m_ids)
 896             feed_entries.extend(self.url_result(id, 'Youtube') for id in ids)
 897             if info['paging'] is None:
 898                 break
 899         return self.playlist_result(feed_entries, playlist_title='Youtube Subscriptions')