[subtitles] made inheritance hierarchy flat as requested
[youtube-dl] / 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 .subtitles import SubtitlesIE
11 from ..utils import (
12     compat_http_client,
13     compat_parse_qs,
14     compat_urllib_error,
15     compat_urllib_parse,
16     compat_urllib_request,
17     compat_str,
18
19     clean_html,
20     get_element_by_id,
21     ExtractorError,
22     unescapeHTML,
23     unified_strdate,
24     orderedSet,
25 )
26
27 class YoutubeBaseInfoExtractor(SubtitlesIE):
28     """Provide base functions for Youtube extractors"""
29     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
30     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
31     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
32     _NETRC_MACHINE = 'youtube'
33     # If True it will raise an error if no login info is provided
34     _LOGIN_REQUIRED = False
35
36     def report_lang(self):
37         """Report attempt to set language."""
38         self.to_screen(u'Setting language')
39
40     def _set_language(self):
41         request = compat_urllib_request.Request(self._LANG_URL)
42         try:
43             self.report_lang()
44             compat_urllib_request.urlopen(request).read()
45         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
46             self._downloader.report_warning(u'unable to set language: %s' % compat_str(err))
47             return False
48         return True
49
50     def _login(self):
51         (username, password) = self._get_login_info()
52         # No authentication to be performed
53         if username is None:
54             if self._LOGIN_REQUIRED:
55                 raise ExtractorError(u'No login info available, needed for using %s.' % self.IE_NAME, expected=True)
56             return False
57
58         request = compat_urllib_request.Request(self._LOGIN_URL)
59         try:
60             login_page = compat_urllib_request.urlopen(request).read().decode('utf-8')
61         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
62             self._downloader.report_warning(u'unable to fetch login page: %s' % compat_str(err))
63             return False
64
65         galx = None
66         dsh = None
67         match = re.search(re.compile(r'<input.+?name="GALX".+?value="(.+?)"', re.DOTALL), login_page)
68         if match:
69           galx = match.group(1)
70         match = re.search(re.compile(r'<input.+?name="dsh".+?value="(.+?)"', re.DOTALL), login_page)
71         if match:
72           dsh = match.group(1)
73
74         # Log in
75         login_form_strs = {
76                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
77                 u'Email': username,
78                 u'GALX': galx,
79                 u'Passwd': password,
80                 u'PersistentCookie': u'yes',
81                 u'_utf8': u'霱',
82                 u'bgresponse': u'js_disabled',
83                 u'checkConnection': u'',
84                 u'checkedDomains': u'youtube',
85                 u'dnConn': u'',
86                 u'dsh': dsh,
87                 u'pstMsg': u'0',
88                 u'rmShown': u'1',
89                 u'secTok': u'',
90                 u'signIn': u'Sign in',
91                 u'timeStmp': u'',
92                 u'service': u'youtube',
93                 u'uilel': u'3',
94                 u'hl': u'en_US',
95         }
96         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
97         # chokes on unicode
98         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
99         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
100         request = compat_urllib_request.Request(self._LOGIN_URL, login_data)
101         try:
102             self.report_login()
103             login_results = compat_urllib_request.urlopen(request).read().decode('utf-8')
104             if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
105                 self._downloader.report_warning(u'unable to log in: bad username or password')
106                 return False
107         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
108             self._downloader.report_warning(u'unable to log in: %s' % compat_str(err))
109             return False
110         return True
111
112     def _confirm_age(self):
113         age_form = {
114                 'next_url':     '/',
115                 'action_confirm':   'Confirm',
116                 }
117         request = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
118         try:
119             self.report_age_confirmation()
120             compat_urllib_request.urlopen(request).read().decode('utf-8')
121         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
122             raise ExtractorError(u'Unable to confirm age: %s' % compat_str(err))
123         return True
124
125     def _real_initialize(self):
126         if self._downloader is None:
127             return
128         if not self._set_language():
129             return
130         if not self._login():
131             return
132         self._confirm_age()
133
134     def _get_available_subtitles(self, video_id):
135         request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
136         try:
137             sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
138         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
139             self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
140             return {}
141         lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
142
143         sub_lang_list = {}
144         for l in lang_list:
145             lang = l[1]
146             params = compat_urllib_parse.urlencode({
147                 'lang': lang,
148                 'v': video_id,
149                 'fmt': self._downloader.params.get('subtitlesformat'),
150             })
151             url = u'http://www.youtube.com/api/timedtext?' + params
152             sub_lang_list[lang] = url
153         if not sub_lang_list:
154             self._downloader.report_warning(u'video doesn\'t have subtitles')
155             return {}
156         return sub_lang_list
157
158     def _request_automatic_caption(self, video_id, webpage):
159         """We need the webpage for getting the captions url, pass it as an
160            argument to speed up the process."""
161         sub_lang = (self._downloader.params.get('subtitleslangs') or ['en'])[0]
162         sub_format = self._downloader.params.get('subtitlesformat')
163         self.to_screen(u'%s: Looking for automatic captions' % video_id)
164         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
165         err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
166         if mobj is None:
167             self._downloader.report_warning(err_msg)
168             return {}
169         player_config = json.loads(mobj.group(1))
170         try:
171             args = player_config[u'args']
172             caption_url = args[u'ttsurl']
173             timestamp = args[u'timestamp']
174             params = compat_urllib_parse.urlencode({
175                 'lang': 'en',
176                 'tlang': sub_lang,
177                 'fmt': sub_format,
178                 'ts': timestamp,
179                 'kind': 'asr',
180             })
181             subtitles_url = caption_url + '&' + params
182             sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
183             return {sub_lang: sub}
184         # An extractor error can be raise by the download process if there are
185         # no automatic captions but there are subtitles
186         except (KeyError, ExtractorError):
187             self._downloader.report_warning(err_msg)
188             return {}
189
190 class YoutubeIE(YoutubeBaseInfoExtractor):
191     IE_DESC = u'YouTube.com'
192     _VALID_URL = r"""^
193                      (
194                          (?:https?://)?                                       # http(s):// (optional)
195                          (?:(?:(?:(?:\w+\.)?youtube(?:-nocookie)?\.com/|
196                             tube\.majestyc\.net/)                             # the various hostnames, with wildcard subdomains
197                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
198                          (?:                                                  # the various things that can precede the ID:
199                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
200                              |(?:                                             # or the v= param in all its forms
201                                  (?:(?:watch|movie)(?:_popup)?(?:\.php)?)?    # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
202                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
203                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
204                                  v=
205                              )
206                          ))
207                          |youtu\.be/                                          # just youtu.be/xxxx
208                          )
209                      )?                                                       # all until now is optional -> you can pass the naked ID
210                      ([0-9A-Za-z_-]{11})                                      # here is it! the YouTube video ID
211                      (?(1).+)?                                                # if we found the ID, everything can follow
212                      $"""
213     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
214     # Listed in order of quality
215     _available_formats = ['38', '37', '46', '22', '45', '35', '44', '34', '18', '43', '6', '5', '36', '17', '13',
216                           # Apple HTTP Live Streaming
217                           '96', '95', '94', '93', '92', '132', '151',
218                           # 3D
219                           '85', '84', '102', '83', '101', '82', '100',
220                           # Dash video
221                           '138', '137', '248', '136', '247', '135', '246',
222                           '245', '244', '134', '243', '133', '242', '160',
223                           # Dash audio
224                           '141', '172', '140', '171', '139',
225                           ]
226     _available_formats_prefer_free = ['38', '46', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '36', '17', '13',
227                                       # Apple HTTP Live Streaming
228                                       '96', '95', '94', '93', '92', '132', '151',
229                                       # 3D
230                                       '85', '102', '84', '101', '83', '100', '82',
231                                       # Dash video
232                                       '138', '248', '137', '247', '136', '246', '245',
233                                       '244', '135', '243', '134', '242', '133', '160',
234                                       # Dash audio
235                                       '172', '141', '171', '140', '139',
236                                       ]
237     _video_formats_map = {
238         'flv': ['35', '34', '6', '5'],
239         '3gp': ['36', '17', '13'],
240         'mp4': ['38', '37', '22', '18'],
241         'webm': ['46', '45', '44', '43'],
242     }
243     _video_extensions = {
244         '13': '3gp',
245         '17': '3gp',
246         '18': 'mp4',
247         '22': 'mp4',
248         '36': '3gp',
249         '37': 'mp4',
250         '38': 'mp4',
251         '43': 'webm',
252         '44': 'webm',
253         '45': 'webm',
254         '46': 'webm',
255
256         # 3d videos
257         '82': 'mp4',
258         '83': 'mp4',
259         '84': 'mp4',
260         '85': 'mp4',
261         '100': 'webm',
262         '101': 'webm',
263         '102': 'webm',
264
265         # Apple HTTP Live Streaming
266         '92': 'mp4',
267         '93': 'mp4',
268         '94': 'mp4',
269         '95': 'mp4',
270         '96': 'mp4',
271         '132': 'mp4',
272         '151': 'mp4',
273
274         # Dash mp4
275         '133': 'mp4',
276         '134': 'mp4',
277         '135': 'mp4',
278         '136': 'mp4',
279         '137': 'mp4',
280         '138': 'mp4',
281         '139': 'mp4',
282         '140': 'mp4',
283         '141': 'mp4',
284         '160': 'mp4',
285
286         # Dash webm
287         '171': 'webm',
288         '172': 'webm',
289         '242': 'webm',
290         '243': 'webm',
291         '244': 'webm',
292         '245': 'webm',
293         '246': 'webm',
294         '247': 'webm',
295         '248': 'webm',
296     }
297     _video_dimensions = {
298         '5': '240x400',
299         '6': '???',
300         '13': '???',
301         '17': '144x176',
302         '18': '360x640',
303         '22': '720x1280',
304         '34': '360x640',
305         '35': '480x854',
306         '36': '240x320',
307         '37': '1080x1920',
308         '38': '3072x4096',
309         '43': '360x640',
310         '44': '480x854',
311         '45': '720x1280',
312         '46': '1080x1920',
313         '82': '360p',
314         '83': '480p',
315         '84': '720p',
316         '85': '1080p',
317         '92': '240p',
318         '93': '360p',
319         '94': '480p',
320         '95': '720p',
321         '96': '1080p',
322         '100': '360p',
323         '101': '480p',
324         '102': '720p',
325         '132': '240p',
326         '151': '72p',
327         '133': '240p',
328         '134': '360p',
329         '135': '480p',
330         '136': '720p',
331         '137': '1080p',
332         '138': '>1080p',
333         '139': '48k',
334         '140': '128k',
335         '141': '256k',
336         '160': '192p',
337         '171': '128k',
338         '172': '256k',
339         '242': '240p',
340         '243': '360p',
341         '244': '480p',
342         '245': '480p',
343         '246': '480p',
344         '247': '720p',
345         '248': '1080p',
346     }
347     _special_itags = {
348         '82': '3D',
349         '83': '3D',
350         '84': '3D',
351         '85': '3D',
352         '100': '3D',
353         '101': '3D',
354         '102': '3D',
355         '133': 'DASH Video',
356         '134': 'DASH Video',
357         '135': 'DASH Video',
358         '136': 'DASH Video',
359         '137': 'DASH Video',
360         '138': 'DASH Video',
361         '139': 'DASH Audio',
362         '140': 'DASH Audio',
363         '141': 'DASH Audio',
364         '160': 'DASH Video',
365         '171': 'DASH Audio',
366         '172': 'DASH Audio',
367         '242': 'DASH Video',
368         '243': 'DASH Video',
369         '244': 'DASH Video',
370         '245': 'DASH Video',
371         '246': 'DASH Video',
372         '247': 'DASH Video',
373         '248': 'DASH Video',
374     }
375
376     IE_NAME = u'youtube'
377     _TESTS = [
378         {
379             u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
380             u"file":  u"BaW_jenozKc.mp4",
381             u"info_dict": {
382                 u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
383                 u"uploader": u"Philipp Hagemeister",
384                 u"uploader_id": u"phihag",
385                 u"upload_date": u"20121002",
386                 u"description": u"test chars:  \"'/\\ä↭𝕐\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de ."
387             }
388         },
389         {
390             u"url":  u"http://www.youtube.com/watch?v=1ltcDfZMA3U",
391             u"file":  u"1ltcDfZMA3U.flv",
392             u"note": u"Test VEVO video (#897)",
393             u"info_dict": {
394                 u"upload_date": u"20070518",
395                 u"title": u"Maps - It Will Find You",
396                 u"description": u"Music video by Maps performing It Will Find You.",
397                 u"uploader": u"MuteUSA",
398                 u"uploader_id": u"MuteUSA"
399             }
400         },
401         {
402             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
403             u"file":  u"UxxajLWwzqY.mp4",
404             u"note": u"Test generic use_cipher_signature video (#897)",
405             u"info_dict": {
406                 u"upload_date": u"20120506",
407                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
408                 u"description": u"md5:3e2666e0a55044490499ea45fe9037b7",
409                 u"uploader": u"Icona Pop",
410                 u"uploader_id": u"IconaPop"
411             }
412         },
413         {
414             u"url":  u"https://www.youtube.com/watch?v=07FYdnEawAQ",
415             u"file":  u"07FYdnEawAQ.mp4",
416             u"note": u"Test VEVO video with age protection (#956)",
417             u"info_dict": {
418                 u"upload_date": u"20130703",
419                 u"title": u"Justin Timberlake - Tunnel Vision (Explicit)",
420                 u"description": u"md5:64249768eec3bc4276236606ea996373",
421                 u"uploader": u"justintimberlakeVEVO",
422                 u"uploader_id": u"justintimberlakeVEVO"
423             }
424         },
425         {
426             u'url': u'https://www.youtube.com/watch?v=TGi3HqYrWHE',
427             u'file': u'TGi3HqYrWHE.mp4',
428             u'note': u'm3u8 video',
429             u'info_dict': {
430                 u'title': u'Triathlon - Men - London 2012 Olympic Games',
431                 u'description': u'- Men -  TR02 - Triathlon - 07 August 2012 - London 2012 Olympic Games',
432                 u'uploader': u'olympic',
433                 u'upload_date': u'20120807',
434                 u'uploader_id': u'olympic',
435             },
436             u'params': {
437                 u'skip_download': True,
438             },
439         },
440     ]
441
442
443     @classmethod
444     def suitable(cls, url):
445         """Receives a URL and returns True if suitable for this IE."""
446         if YoutubePlaylistIE.suitable(url): return False
447         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
448
449     def report_video_webpage_download(self, video_id):
450         """Report attempt to download video webpage."""
451         self.to_screen(u'%s: Downloading video webpage' % video_id)
452
453     def report_video_info_webpage_download(self, video_id):
454         """Report attempt to download video info webpage."""
455         self.to_screen(u'%s: Downloading video info webpage' % video_id)
456
457     def report_information_extraction(self, video_id):
458         """Report attempt to extract video information."""
459         self.to_screen(u'%s: Extracting video information' % video_id)
460
461     def report_unavailable_format(self, video_id, format):
462         """Report extracted video URL."""
463         self.to_screen(u'%s: Format %s not available' % (video_id, format))
464
465     def report_rtmp_download(self):
466         """Indicate the download will use the RTMP protocol."""
467         self.to_screen(u'RTMP download detected')
468
469     def _decrypt_signature(self, s):
470         """Turn the encrypted s field into a working signature"""
471
472         if len(s) == 92:
473             return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
474         elif len(s) == 90:
475             return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
476         elif len(s) == 89:
477             return s[84:78:-1] + s[87] + s[77:60:-1] + s[0] + s[59:3:-1]
478         elif len(s) == 88:
479             return s[7:28] + s[87] + s[29:45] + s[55] + s[46:55] + s[2] + s[56:87] + s[28]
480         elif len(s) == 87:
481             return s[6:27] + s[4] + s[28:39] + s[27] + s[40:59] + s[2] + s[60:]
482         elif len(s) == 86:
483             return s[5:34] + s[0] + s[35:38] + s[3] + s[39:45] + s[38] + s[46:53] + s[73] + s[54:73] + s[85] + s[74:85] + s[53]
484         elif len(s) == 85:
485             return s[40] + s[82:43:-1] + s[22] + s[42:40:-1] + s[83] + s[39:22:-1] + s[0] + s[21:2:-1]
486         elif len(s) == 84:
487             return s[81:36:-1] + s[0] + s[35:2:-1]
488         elif len(s) == 83:
489             return s[81:64:-1] + s[82] + s[63:52:-1] + s[45] + s[51:45:-1] + s[1] + s[44:1:-1] + s[0]
490         elif len(s) == 82:
491             return s[1:19] + s[0] + s[20:68] + s[19] + s[69:82]
492         elif len(s) == 81:
493             return s[56] + s[79:56:-1] + s[41] + s[55:41:-1] + s[80] + s[40:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
494         elif len(s) == 80:
495             return s[1:19] + s[0] + s[20:68] + s[19] + s[69:80]
496         elif len(s) == 79:
497             return s[54] + s[77:54:-1] + s[39] + s[53:39:-1] + s[78] + s[38:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
498
499         else:
500             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
501
502     def _decrypt_signature_age_gate(self, s):
503         # The videos with age protection use another player, so the algorithms
504         # can be different.
505         if len(s) == 86:
506             return s[2:63] + s[82] + s[64:82] + s[63]
507         else:
508             # Fallback to the other algortihms
509             return self._decrypt_signature(s)
510
511     def _print_formats(self, formats):
512         print('Available formats:')
513         for x in formats:
514             print('%s\t:\t%s\t[%s]%s' %(x, self._video_extensions.get(x, 'flv'),
515                                         self._video_dimensions.get(x, '???'),
516                                         ' ('+self._special_itags[x]+')' if x in self._special_itags else ''))
517
518     def _extract_id(self, url):
519         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
520         if mobj is None:
521             raise ExtractorError(u'Invalid URL: %s' % url)
522         video_id = mobj.group(2)
523         return video_id
524
525     def _get_video_url_list(self, url_map):
526         """
527         Transform a dictionary in the format {itag:url} to a list of (itag, url)
528         with the requested formats.
529         """
530         req_format = self._downloader.params.get('format', None)
531         format_limit = self._downloader.params.get('format_limit', None)
532         available_formats = self._available_formats_prefer_free if self._downloader.params.get('prefer_free_formats', False) else self._available_formats
533         if format_limit is not None and format_limit in available_formats:
534             format_list = available_formats[available_formats.index(format_limit):]
535         else:
536             format_list = available_formats
537         existing_formats = [x for x in format_list if x in url_map]
538         if len(existing_formats) == 0:
539             raise ExtractorError(u'no known formats available for video')
540         if self._downloader.params.get('listformats', None):
541             self._print_formats(existing_formats)
542             return
543         if req_format is None or req_format == 'best':
544             video_url_list = [(existing_formats[0], url_map[existing_formats[0]])] # Best quality
545         elif req_format == 'worst':
546             video_url_list = [(existing_formats[-1], url_map[existing_formats[-1]])] # worst quality
547         elif req_format in ('-1', 'all'):
548             video_url_list = [(f, url_map[f]) for f in existing_formats] # All formats
549         else:
550             # Specific formats. We pick the first in a slash-delimeted sequence.
551             # Format can be specified as itag or 'mp4' or 'flv' etc. We pick the highest quality
552             # available in the specified format. For example,
553             # if '1/2/3/4' is requested and '2' and '4' are available, we pick '2'.
554             # if '1/mp4/3/4' is requested and '1' and '5' (is a mp4) are available, we pick '1'.
555             # if '1/mp4/3/4' is requested and '4' and '5' (is a mp4) are available, we pick '5'.
556             req_formats = req_format.split('/')
557             video_url_list = None
558             for rf in req_formats:
559                 if rf in url_map:
560                     video_url_list = [(rf, url_map[rf])]
561                     break
562                 if rf in self._video_formats_map:
563                     for srf in self._video_formats_map[rf]:
564                         if srf in url_map:
565                             video_url_list = [(srf, url_map[srf])]
566                             break
567                     else:
568                         continue
569                     break
570             if video_url_list is None:
571                 raise ExtractorError(u'requested format not available')
572         return video_url_list
573
574     def _extract_from_m3u8(self, manifest_url, video_id):
575         url_map = {}
576         def _get_urls(_manifest):
577             lines = _manifest.split('\n')
578             urls = filter(lambda l: l and not l.startswith('#'),
579                             lines)
580             return urls
581         manifest = self._download_webpage(manifest_url, video_id, u'Downloading formats manifest')
582         formats_urls = _get_urls(manifest)
583         for format_url in formats_urls:
584             itag = self._search_regex(r'itag/(\d+?)/', format_url, 'itag')
585             url_map[itag] = format_url
586         return url_map
587
588     def _real_extract(self, url):
589         if re.match(r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$', url):
590             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  ).')
591
592         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
593         mobj = re.search(self._NEXT_URL_RE, url)
594         if mobj:
595             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
596         video_id = self._extract_id(url)
597
598         # Get video webpage
599         self.report_video_webpage_download(video_id)
600         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
601         request = compat_urllib_request.Request(url)
602         try:
603             video_webpage_bytes = compat_urllib_request.urlopen(request).read()
604         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
605             raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err))
606
607         video_webpage = video_webpage_bytes.decode('utf-8', 'ignore')
608
609         # Attempt to extract SWF player URL
610         mobj = re.search(r'swfConfig.*?"(http:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
611         if mobj is not None:
612             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
613         else:
614             player_url = None
615
616         # Get video info
617         self.report_video_info_webpage_download(video_id)
618         if re.search(r'player-age-gate-content">', video_webpage) is not None:
619             self.report_age_confirmation()
620             age_gate = True
621             # We simulate the access to the video from www.youtube.com/v/{video_id}
622             # this can be viewed without login into Youtube
623             data = compat_urllib_parse.urlencode({'video_id': video_id,
624                                                   'el': 'embedded',
625                                                   'gl': 'US',
626                                                   'hl': 'en',
627                                                   'eurl': 'https://youtube.googleapis.com/v/' + video_id,
628                                                   'asv': 3,
629                                                   'sts':'1588',
630                                                   })
631             video_info_url = 'https://www.youtube.com/get_video_info?' + data
632             video_info_webpage = self._download_webpage(video_info_url, video_id,
633                                     note=False,
634                                     errnote='unable to download video info webpage')
635             video_info = compat_parse_qs(video_info_webpage)
636         else:
637             age_gate = False
638             for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
639                 video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
640                         % (video_id, el_type))
641                 video_info_webpage = self._download_webpage(video_info_url, video_id,
642                                         note=False,
643                                         errnote='unable to download video info webpage')
644                 video_info = compat_parse_qs(video_info_webpage)
645                 if 'token' in video_info:
646                     break
647         if 'token' not in video_info:
648             if 'reason' in video_info:
649                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0], expected=True)
650             else:
651                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
652
653         # Check for "rental" videos
654         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
655             raise ExtractorError(u'"rental" videos not supported')
656
657         # Start extracting information
658         self.report_information_extraction(video_id)
659
660         # uploader
661         if 'author' not in video_info:
662             raise ExtractorError(u'Unable to extract uploader name')
663         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
664
665         # uploader_id
666         video_uploader_id = None
667         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
668         if mobj is not None:
669             video_uploader_id = mobj.group(1)
670         else:
671             self._downloader.report_warning(u'unable to extract uploader nickname')
672
673         # title
674         if 'title' not in video_info:
675             raise ExtractorError(u'Unable to extract video title')
676         video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
677
678         # thumbnail image
679         # We try first to get a high quality image:
680         m_thumb = re.search(r'<span itemprop="thumbnail".*?href="(.*?)">',
681                             video_webpage, re.DOTALL)
682         if m_thumb is not None:
683             video_thumbnail = m_thumb.group(1)
684         elif 'thumbnail_url' not in video_info:
685             self._downloader.report_warning(u'unable to extract video thumbnail')
686             video_thumbnail = ''
687         else:   # don't panic if we can't find it
688             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
689
690         # upload date
691         upload_date = None
692         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
693         if mobj is not None:
694             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
695             upload_date = unified_strdate(upload_date)
696
697         # description
698         video_description = get_element_by_id("eow-description", video_webpage)
699         if video_description:
700             video_description = clean_html(video_description)
701         else:
702             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
703             if fd_mobj:
704                 video_description = unescapeHTML(fd_mobj.group(1))
705             else:
706                 video_description = u''
707
708         # subtitles
709         video_subtitles = None
710
711         if self._downloader.params.get('writesubtitles', False) or self._downloader.params.get('allsubtitles', False):
712             video_subtitles = self._extract_subtitles(video_id)
713         elif self._downloader.params.get('writeautomaticsub', False):
714             video_subtitles = self._request_automatic_caption(video_id, video_webpage)
715
716         if self._downloader.params.get('listsubtitles', False):
717             self._list_available_subtitles(video_id)
718             return
719
720         if 'length_seconds' not in video_info:
721             self._downloader.report_warning(u'unable to extract video duration')
722             video_duration = ''
723         else:
724             video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
725
726         # Decide which formats to download
727
728         try:
729             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
730             if not mobj:
731                 raise ValueError('Could not find vevo ID')
732             info = json.loads(mobj.group(1))
733             args = info['args']
734             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
735             # this signatures are encrypted
736             m_s = re.search(r'[&,]s=', args['url_encoded_fmt_stream_map'])
737             if m_s is not None:
738                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
739                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
740             m_s = re.search(r'[&,]s=', args.get('adaptive_fmts', u''))
741             if m_s is not None:
742                 if 'url_encoded_fmt_stream_map' in video_info:
743                     video_info['url_encoded_fmt_stream_map'][0] += ',' + args['adaptive_fmts']
744                 else:
745                     video_info['url_encoded_fmt_stream_map'] = [args['adaptive_fmts']]
746             elif 'adaptive_fmts' in video_info:
747                 if 'url_encoded_fmt_stream_map' in video_info:
748                     video_info['url_encoded_fmt_stream_map'][0] += ',' + video_info['adaptive_fmts'][0]
749                 else:
750                     video_info['url_encoded_fmt_stream_map'] = video_info['adaptive_fmts']
751         except ValueError:
752             pass
753
754         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
755             self.report_rtmp_download()
756             video_url_list = [(None, video_info['conn'][0])]
757         elif 'url_encoded_fmt_stream_map' in video_info and len(video_info['url_encoded_fmt_stream_map']) >= 1:
758             if 'rtmpe%3Dyes' in video_info['url_encoded_fmt_stream_map'][0]:
759                 raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
760             url_map = {}
761             for url_data_str in video_info['url_encoded_fmt_stream_map'][0].split(','):
762                 url_data = compat_parse_qs(url_data_str)
763                 if 'itag' in url_data and 'url' in url_data:
764                     url = url_data['url'][0]
765                     if 'sig' in url_data:
766                         url += '&signature=' + url_data['sig'][0]
767                     elif 's' in url_data:
768                         if self._downloader.params.get('verbose'):
769                             s = url_data['s'][0]
770                             if age_gate:
771                                 player_version = self._search_regex(r'ad3-(.+?)\.swf',
772                                     video_info['ad3_module'][0] if 'ad3_module' in video_info else 'NOT FOUND',
773                                     'flash player', fatal=False)
774                                 player = 'flash player %s' % player_version
775                             else:
776                                 player = u'html5 player %s' % self._search_regex(r'html5player-(.+?)\.js', video_webpage,
777                                     'html5 player', fatal=False)
778                             parts_sizes = u'.'.join(compat_str(len(part)) for part in s.split('.'))
779                             self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
780                                 (len(s), parts_sizes, url_data['itag'][0], player))
781                         encrypted_sig = url_data['s'][0]
782                         if age_gate:
783                             signature = self._decrypt_signature_age_gate(encrypted_sig)
784                         else:
785                             signature = self._decrypt_signature(encrypted_sig)
786                         url += '&signature=' + signature
787                     if 'ratebypass' not in url:
788                         url += '&ratebypass=yes'
789                     url_map[url_data['itag'][0]] = url
790             video_url_list = self._get_video_url_list(url_map)
791             if not video_url_list:
792                 return
793         elif video_info.get('hlsvp'):
794             manifest_url = video_info['hlsvp'][0]
795             url_map = self._extract_from_m3u8(manifest_url, video_id)
796             video_url_list = self._get_video_url_list(url_map)
797             if not video_url_list:
798                 return
799
800         else:
801             raise ExtractorError(u'no conn or url_encoded_fmt_stream_map information found in video info')
802
803         results = []
804         for format_param, video_real_url in video_url_list:
805             # Extension
806             video_extension = self._video_extensions.get(format_param, 'flv')
807
808             video_format = '{0} - {1}{2}'.format(format_param if format_param else video_extension,
809                                               self._video_dimensions.get(format_param, '???'),
810                                               ' ('+self._special_itags[format_param]+')' if format_param in self._special_itags else '')
811
812             results.append({
813                 'id':       video_id,
814                 'url':      video_real_url,
815                 'uploader': video_uploader,
816                 'uploader_id': video_uploader_id,
817                 'upload_date':  upload_date,
818                 'title':    video_title,
819                 'ext':      video_extension,
820                 'format':   video_format,
821                 'thumbnail':    video_thumbnail,
822                 'description':  video_description,
823                 'player_url':   player_url,
824                 'subtitles':    video_subtitles,
825                 'duration':     video_duration
826             })
827         return results
828
829 class YoutubePlaylistIE(InfoExtractor):
830     IE_DESC = u'YouTube.com playlists'
831     _VALID_URL = r"""(?:
832                         (?:https?://)?
833                         (?:\w+\.)?
834                         youtube\.com/
835                         (?:
836                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
837                            \? (?:.*?&)*? (?:p|a|list)=
838                         |  p/
839                         )
840                         ((?:PL|EC|UU|FL)?[0-9A-Za-z-_]{10,})
841                         .*
842                      |
843                         ((?:PL|EC|UU|FL)[0-9A-Za-z-_]{10,})
844                      )"""
845     _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/playlists/%s?max-results=%i&start-index=%i&v=2&alt=json&safeSearch=none'
846     _MAX_RESULTS = 50
847     IE_NAME = u'youtube:playlist'
848
849     @classmethod
850     def suitable(cls, url):
851         """Receives a URL and returns True if suitable for this IE."""
852         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
853
854     def _real_extract(self, url):
855         # Extract playlist id
856         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
857         if mobj is None:
858             raise ExtractorError(u'Invalid URL: %s' % url)
859
860         # Download playlist videos from API
861         playlist_id = mobj.group(1) or mobj.group(2)
862         videos = []
863
864         for page_num in itertools.count(1):
865             start_index = self._MAX_RESULTS * (page_num - 1) + 1
866             if start_index >= 1000:
867                 self._downloader.report_warning(u'Max number of results reached')
868                 break
869             url = self._TEMPLATE_URL % (playlist_id, self._MAX_RESULTS, start_index)
870             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
871
872             try:
873                 response = json.loads(page)
874             except ValueError as err:
875                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
876
877             if 'feed' not in response:
878                 raise ExtractorError(u'Got a malformed response from YouTube API')
879             playlist_title = response['feed']['title']['$t']
880             if 'entry' not in response['feed']:
881                 # Number of videos is a multiple of self._MAX_RESULTS
882                 break
883
884             for entry in response['feed']['entry']:
885                 index = entry['yt$position']['$t']
886                 if 'media$group' in entry and 'yt$videoid' in entry['media$group']:
887                     videos.append((
888                         index,
889                         'https://www.youtube.com/watch?v=' + entry['media$group']['yt$videoid']['$t']
890                     ))
891
892         videos = [v[1] for v in sorted(videos)]
893
894         url_results = [self.url_result(vurl, 'Youtube') for vurl in videos]
895         return [self.playlist_result(url_results, playlist_id, playlist_title)]
896
897
898 class YoutubeChannelIE(InfoExtractor):
899     IE_DESC = u'YouTube.com channels'
900     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
901     _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
902     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
903     _MORE_PAGES_URL = 'http://www.youtube.com/c4_browse_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
904     IE_NAME = u'youtube:channel'
905
906     def extract_videos_from_page(self, page):
907         ids_in_page = []
908         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
909             if mobj.group(1) not in ids_in_page:
910                 ids_in_page.append(mobj.group(1))
911         return ids_in_page
912
913     def _real_extract(self, url):
914         # Extract channel id
915         mobj = re.match(self._VALID_URL, url)
916         if mobj is None:
917             raise ExtractorError(u'Invalid URL: %s' % url)
918
919         # Download channel page
920         channel_id = mobj.group(1)
921         video_ids = []
922         pagenum = 1
923
924         url = self._TEMPLATE_URL % (channel_id, pagenum)
925         page = self._download_webpage(url, channel_id,
926                                       u'Downloading page #%s' % pagenum)
927
928         # Extract video identifiers
929         ids_in_page = self.extract_videos_from_page(page)
930         video_ids.extend(ids_in_page)
931
932         # Download any subsequent channel pages using the json-based channel_ajax query
933         if self._MORE_PAGES_INDICATOR in page:
934             for pagenum in itertools.count(1):
935                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
936                 page = self._download_webpage(url, channel_id,
937                                               u'Downloading page #%s' % pagenum)
938
939                 page = json.loads(page)
940
941                 ids_in_page = self.extract_videos_from_page(page['content_html'])
942                 video_ids.extend(ids_in_page)
943
944                 if self._MORE_PAGES_INDICATOR  not in page['load_more_widget_html']:
945                     break
946
947         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
948
949         urls = ['http://www.youtube.com/watch?v=%s' % id for id in video_ids]
950         url_entries = [self.url_result(eurl, 'Youtube') for eurl in urls]
951         return [self.playlist_result(url_entries, channel_id)]
952
953
954 class YoutubeUserIE(InfoExtractor):
955     IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
956     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?)|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
957     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
958     _GDATA_PAGE_SIZE = 50
959     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d&alt=json'
960     IE_NAME = u'youtube:user'
961
962     @classmethod
963     def suitable(cls, url):
964         # Don't return True if the url can be extracted with other youtube
965         # extractor, the regex would is too permissive and it would match.
966         other_ies = iter(klass for (name, klass) in globals().items() if name.endswith('IE') and klass is not cls)
967         if any(ie.suitable(url) for ie in other_ies): return False
968         else: return super(YoutubeUserIE, cls).suitable(url)
969
970     def _real_extract(self, url):
971         # Extract username
972         mobj = re.match(self._VALID_URL, url)
973         if mobj is None:
974             raise ExtractorError(u'Invalid URL: %s' % url)
975
976         username = mobj.group(1)
977
978         # Download video ids using YouTube Data API. Result size per
979         # query is limited (currently to 50 videos) so we need to query
980         # page by page until there are no video ids - it means we got
981         # all of them.
982
983         video_ids = []
984
985         for pagenum in itertools.count(0):
986             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
987
988             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
989             page = self._download_webpage(gdata_url, username,
990                                           u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
991
992             try:
993                 response = json.loads(page)
994             except ValueError as err:
995                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
996
997             # Extract video identifiers
998             ids_in_page = []
999             for entry in response['feed']['entry']:
1000                 ids_in_page.append(entry['id']['$t'].split('/')[-1])
1001             video_ids.extend(ids_in_page)
1002
1003             # A little optimization - if current page is not
1004             # "full", ie. does not contain PAGE_SIZE video ids then
1005             # we can assume that this page is the last one - there
1006             # are no more ids on further pages - no need to query
1007             # again.
1008
1009             if len(ids_in_page) < self._GDATA_PAGE_SIZE:
1010                 break
1011
1012         urls = ['http://www.youtube.com/watch?v=%s' % video_id for video_id in video_ids]
1013         url_results = [self.url_result(rurl, 'Youtube') for rurl in urls]
1014         return [self.playlist_result(url_results, playlist_title = username)]
1015
1016 class YoutubeSearchIE(SearchInfoExtractor):
1017     IE_DESC = u'YouTube.com searches'
1018     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
1019     _MAX_RESULTS = 1000
1020     IE_NAME = u'youtube:search'
1021     _SEARCH_KEY = 'ytsearch'
1022
1023     def report_download_page(self, query, pagenum):
1024         """Report attempt to download search page with given number."""
1025         self._downloader.to_screen(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
1026
1027     def _get_n_results(self, query, n):
1028         """Get a specified number of results for a query"""
1029
1030         video_ids = []
1031         pagenum = 0
1032         limit = n
1033
1034         while (50 * pagenum) < limit:
1035             self.report_download_page(query, pagenum+1)
1036             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
1037             request = compat_urllib_request.Request(result_url)
1038             try:
1039                 data = compat_urllib_request.urlopen(request).read().decode('utf-8')
1040             except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
1041                 raise ExtractorError(u'Unable to download API page: %s' % compat_str(err))
1042             api_response = json.loads(data)['data']
1043
1044             if not 'items' in api_response:
1045                 raise ExtractorError(u'[youtube] No video results')
1046
1047             new_ids = list(video['id'] for video in api_response['items'])
1048             video_ids += new_ids
1049
1050             limit = min(n, api_response['totalItems'])
1051             pagenum += 1
1052
1053         if len(video_ids) > n:
1054             video_ids = video_ids[:n]
1055         videos = [self.url_result('http://www.youtube.com/watch?v=%s' % id, 'Youtube') for id in video_ids]
1056         return self.playlist_result(videos, query)
1057
1058
1059 class YoutubeShowIE(InfoExtractor):
1060     IE_DESC = u'YouTube.com (multi-season) shows'
1061     _VALID_URL = r'https?://www\.youtube\.com/show/(.*)'
1062     IE_NAME = u'youtube:show'
1063
1064     def _real_extract(self, url):
1065         mobj = re.match(self._VALID_URL, url)
1066         show_name = mobj.group(1)
1067         webpage = self._download_webpage(url, show_name, u'Downloading show webpage')
1068         # There's one playlist for each season of the show
1069         m_seasons = list(re.finditer(r'href="(/playlist\?list=.*?)"', webpage))
1070         self.to_screen(u'%s: Found %s seasons' % (show_name, len(m_seasons)))
1071         return [self.url_result('https://www.youtube.com' + season.group(1), 'YoutubePlaylist') for season in m_seasons]
1072
1073
1074 class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
1075     """
1076     Base class for extractors that fetch info from
1077     http://www.youtube.com/feed_ajax
1078     Subclasses must define the _FEED_NAME and _PLAYLIST_TITLE properties.
1079     """
1080     _LOGIN_REQUIRED = True
1081     _PAGING_STEP = 30
1082     # use action_load_personal_feed instead of action_load_system_feed
1083     _PERSONAL_FEED = False
1084
1085     @property
1086     def _FEED_TEMPLATE(self):
1087         action = 'action_load_system_feed'
1088         if self._PERSONAL_FEED:
1089             action = 'action_load_personal_feed'
1090         return 'http://www.youtube.com/feed_ajax?%s=1&feed_name=%s&paging=%%s' % (action, self._FEED_NAME)
1091
1092     @property
1093     def IE_NAME(self):
1094         return u'youtube:%s' % self._FEED_NAME
1095
1096     def _real_initialize(self):
1097         self._login()
1098
1099     def _real_extract(self, url):
1100         feed_entries = []
1101         # The step argument is available only in 2.7 or higher
1102         for i in itertools.count(0):
1103             paging = i*self._PAGING_STEP
1104             info = self._download_webpage(self._FEED_TEMPLATE % paging,
1105                                           u'%s feed' % self._FEED_NAME,
1106                                           u'Downloading page %s' % i)
1107             info = json.loads(info)
1108             feed_html = info['feed_html']
1109             m_ids = re.finditer(r'"/watch\?v=(.*?)["&]', feed_html)
1110             ids = orderedSet(m.group(1) for m in m_ids)
1111             feed_entries.extend(self.url_result(id, 'Youtube') for id in ids)
1112             if info['paging'] is None:
1113                 break
1114         return self.playlist_result(feed_entries, playlist_title=self._PLAYLIST_TITLE)
1115
1116 class YoutubeSubscriptionsIE(YoutubeFeedsInfoExtractor):
1117     IE_DESC = u'YouTube.com subscriptions feed, "ytsubs" keyword(requires authentication)'
1118     _VALID_URL = r'https?://www\.youtube\.com/feed/subscriptions|:ytsubs(?:criptions)?'
1119     _FEED_NAME = 'subscriptions'
1120     _PLAYLIST_TITLE = u'Youtube Subscriptions'
1121
1122 class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
1123     IE_DESC = u'YouTube.com recommended videos, "ytrec" keyword (requires authentication)'
1124     _VALID_URL = r'https?://www\.youtube\.com/feed/recommended|:ytrec(?:ommended)?'
1125     _FEED_NAME = 'recommended'
1126     _PLAYLIST_TITLE = u'Youtube Recommended videos'
1127
1128 class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
1129     IE_DESC = u'Youtube watch later list, "ytwatchlater" keyword (requires authentication)'
1130     _VALID_URL = r'https?://www\.youtube\.com/feed/watch_later|:ytwatchlater'
1131     _FEED_NAME = 'watch_later'
1132     _PLAYLIST_TITLE = u'Youtube Watch Later'
1133     _PAGING_STEP = 100
1134     _PERSONAL_FEED = True
1135
1136 class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
1137     IE_NAME = u'youtube:favorites'
1138     IE_DESC = u'YouTube.com favourite videos, "ytfav" keyword (requires authentication)'
1139     _VALID_URL = r'https?://www\.youtube\.com/my_favorites|:ytfav(?:ou?rites)?'
1140     _LOGIN_REQUIRED = True
1141
1142     def _real_extract(self, url):
1143         webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
1144         playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, u'favourites playlist id')
1145         return self.url_result(playlist_id, 'YoutubePlaylist')