youtube_dl/extractor/youtube.py

   1 # coding: utf-8
   2
   3 import collections
   4 import itertools
   5 import io
   6 import json
   7 import netrc
   8 import re
   9 import socket
  10 import string
  11 import struct
  12 import traceback
  13 import zlib
  14
  15 from .common import InfoExtractor, SearchInfoExtractor
  16 from .subtitles import SubtitlesInfoExtractor
  17 from ..utils import (
  18     compat_http_client,
  19     compat_parse_qs,
  20     compat_urllib_error,
  21     compat_urllib_parse,
  22     compat_urllib_request,
  23     compat_str,
  24
  25     clean_html,
  26     get_element_by_id,
  27     ExtractorError,
  28     unescapeHTML,
  29     unified_strdate,
  30     orderedSet,
  31 )
  32
  33 class YoutubeBaseInfoExtractor(InfoExtractor):
  34     """Provide base functions for Youtube extractors"""
  35     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  36     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
  37     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
  38     _NETRC_MACHINE = 'youtube'
  39     # If True it will raise an error if no login info is provided
  40     _LOGIN_REQUIRED = False
  41
  42     def report_lang(self):
  43         """Report attempt to set language."""
  44         self.to_screen(u'Setting language')
  45
  46     def _set_language(self):
  47         request = compat_urllib_request.Request(self._LANG_URL)
  48         try:
  49             self.report_lang()
  50             compat_urllib_request.urlopen(request).read()
  51         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
  52             self._downloader.report_warning(u'unable to set language: %s' % compat_str(err))
  53             return False
  54         return True
  55
  56     def _login(self):
  57         (username, password) = self._get_login_info()
  58         # No authentication to be performed
  59         if username is None:
  60             if self._LOGIN_REQUIRED:
  61                 raise ExtractorError(u'No login info available, needed for using %s.' % self.IE_NAME, expected=True)
  62             return False
  63
  64         request = compat_urllib_request.Request(self._LOGIN_URL)
  65         try:
  66             login_page = compat_urllib_request.urlopen(request).read().decode('utf-8')
  67         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
  68             self._downloader.report_warning(u'unable to fetch login page: %s' % compat_str(err))
  69             return False
  70
  71         galx = None
  72         dsh = None
  73         match = re.search(re.compile(r'<input.+?name="GALX".+?value="(.+?)"', re.DOTALL), login_page)
  74         if match:
  75           galx = match.group(1)
  76         match = re.search(re.compile(r'<input.+?name="dsh".+?value="(.+?)"', re.DOTALL), login_page)
  77         if match:
  78           dsh = match.group(1)
  79
  80         # Log in
  81         login_form_strs = {
  82                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
  83                 u'Email': username,
  84                 u'GALX': galx,
  85                 u'Passwd': password,
  86                 u'PersistentCookie': u'yes',
  87                 u'_utf8': u'霱',
  88                 u'bgresponse': u'js_disabled',
  89                 u'checkConnection': u'',
  90                 u'checkedDomains': u'youtube',
  91                 u'dnConn': u'',
  92                 u'dsh': dsh,
  93                 u'pstMsg': u'0',
  94                 u'rmShown': u'1',
  95                 u'secTok': u'',
  96                 u'signIn': u'Sign in',
  97                 u'timeStmp': u'',
  98                 u'service': u'youtube',
  99                 u'uilel': u'3',
 100                 u'hl': u'en_US',
 101         }
 102         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
 103         # chokes on unicode
 104         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
 105         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
 106         request = compat_urllib_request.Request(self._LOGIN_URL, login_data)
 107         try:
 108             self.report_login()
 109             login_results = compat_urllib_request.urlopen(request).read().decode('utf-8')
 110             if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
 111                 self._downloader.report_warning(u'unable to log in: bad username or password')
 112                 return False
 113         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 114             self._downloader.report_warning(u'unable to log in: %s' % compat_str(err))
 115             return False
 116         return True
 117
 118     def _confirm_age(self):
 119         age_form = {
 120                 'next_url':     '/',
 121                 'action_confirm':   'Confirm',
 122                 }
 123         request = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
 124         try:
 125             self.report_age_confirmation()
 126             compat_urllib_request.urlopen(request).read().decode('utf-8')
 127         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 128             raise ExtractorError(u'Unable to confirm age: %s' % compat_str(err))
 129         return True
 130
 131     def _real_initialize(self):
 132         if self._downloader is None:
 133             return
 134         if not self._set_language():
 135             return
 136         if not self._login():
 137             return
 138         self._confirm_age()
 139
 140
 141 class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
 142     IE_DESC = u'YouTube.com'
 143     _VALID_URL = r"""^
 144                      (
 145                          (?:https?://)?                                       # http(s):// (optional)
 146                          (?:(?:(?:(?:\w+\.)?youtube(?:-nocookie)?\.com/|
 147                             tube\.majestyc\.net/|
 148                             youtube\.googleapis\.com/)                        # the various hostnames, with wildcard subdomains
 149                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
 150                          (?:                                                  # the various things that can precede the ID:
 151                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
 152                              |(?:                                             # or the v= param in all its forms
 153                                  (?:(?:watch|movie)(?:_popup)?(?:\.php)?)?    # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
 154                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
 155                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
 156                                  v=
 157                              )
 158                          ))
 159                          |youtu\.be/                                          # just youtu.be/xxxx
 160                          )
 161                      )?                                                       # all until now is optional -> you can pass the naked ID
 162                      ([0-9A-Za-z_-]{11})                                      # here is it! the YouTube video ID
 163                      (?(1).+)?                                                # if we found the ID, everything can follow
 164                      $"""
 165     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
 166     # Listed in order of quality
 167     _available_formats = ['38', '37', '46', '22', '45', '35', '44', '34', '18', '43', '6', '5', '36', '17', '13',
 168                           # Apple HTTP Live Streaming
 169                           '96', '95', '94', '93', '92', '132', '151',
 170                           # 3D
 171                           '85', '84', '102', '83', '101', '82', '100',
 172                           # Dash video
 173                           '138', '137', '248', '136', '247', '135', '246',
 174                           '245', '244', '134', '243', '133', '242', '160',
 175                           # Dash audio
 176                           '141', '172', '140', '171', '139',
 177                           ]
 178     _available_formats_prefer_free = ['38', '46', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '36', '17', '13',
 179                                       # Apple HTTP Live Streaming
 180                                       '96', '95', '94', '93', '92', '132', '151',
 181                                       # 3D
 182                                       '85', '102', '84', '101', '83', '100', '82',
 183                                       # Dash video
 184                                       '138', '248', '137', '247', '136', '246', '245',
 185                                       '244', '135', '243', '134', '242', '133', '160',
 186                                       # Dash audio
 187                                       '172', '141', '171', '140', '139',
 188                                       ]
 189     _video_formats_map = {
 190         'flv': ['35', '34', '6', '5'],
 191         '3gp': ['36', '17', '13'],
 192         'mp4': ['38', '37', '22', '18'],
 193         'webm': ['46', '45', '44', '43'],
 194     }
 195     _video_extensions = {
 196         '13': '3gp',
 197         '17': '3gp',
 198         '18': 'mp4',
 199         '22': 'mp4',
 200         '36': '3gp',
 201         '37': 'mp4',
 202         '38': 'mp4',
 203         '43': 'webm',
 204         '44': 'webm',
 205         '45': 'webm',
 206         '46': 'webm',
 207
 208         # 3d videos
 209         '82': 'mp4',
 210         '83': 'mp4',
 211         '84': 'mp4',
 212         '85': 'mp4',
 213         '100': 'webm',
 214         '101': 'webm',
 215         '102': 'webm',
 216
 217         # Apple HTTP Live Streaming
 218         '92': 'mp4',
 219         '93': 'mp4',
 220         '94': 'mp4',
 221         '95': 'mp4',
 222         '96': 'mp4',
 223         '132': 'mp4',
 224         '151': 'mp4',
 225
 226         # Dash mp4
 227         '133': 'mp4',
 228         '134': 'mp4',
 229         '135': 'mp4',
 230         '136': 'mp4',
 231         '137': 'mp4',
 232         '138': 'mp4',
 233         '139': 'mp4',
 234         '140': 'mp4',
 235         '141': 'mp4',
 236         '160': 'mp4',
 237
 238         # Dash webm
 239         '171': 'webm',
 240         '172': 'webm',
 241         '242': 'webm',
 242         '243': 'webm',
 243         '244': 'webm',
 244         '245': 'webm',
 245         '246': 'webm',
 246         '247': 'webm',
 247         '248': 'webm',
 248     }
 249     _video_dimensions = {
 250         '5': '240x400',
 251         '6': '???',
 252         '13': '???',
 253         '17': '144x176',
 254         '18': '360x640',
 255         '22': '720x1280',
 256         '34': '360x640',
 257         '35': '480x854',
 258         '36': '240x320',
 259         '37': '1080x1920',
 260         '38': '3072x4096',
 261         '43': '360x640',
 262         '44': '480x854',
 263         '45': '720x1280',
 264         '46': '1080x1920',
 265         '82': '360p',
 266         '83': '480p',
 267         '84': '720p',
 268         '85': '1080p',
 269         '92': '240p',
 270         '93': '360p',
 271         '94': '480p',
 272         '95': '720p',
 273         '96': '1080p',
 274         '100': '360p',
 275         '101': '480p',
 276         '102': '720p',
 277         '132': '240p',
 278         '151': '72p',
 279         '133': '240p',
 280         '134': '360p',
 281         '135': '480p',
 282         '136': '720p',
 283         '137': '1080p',
 284         '138': '>1080p',
 285         '139': '48k',
 286         '140': '128k',
 287         '141': '256k',
 288         '160': '192p',
 289         '171': '128k',
 290         '172': '256k',
 291         '242': '240p',
 292         '243': '360p',
 293         '244': '480p',
 294         '245': '480p',
 295         '246': '480p',
 296         '247': '720p',
 297         '248': '1080p',
 298     }
 299     _special_itags = {
 300         '82': '3D',
 301         '83': '3D',
 302         '84': '3D',
 303         '85': '3D',
 304         '100': '3D',
 305         '101': '3D',
 306         '102': '3D',
 307         '133': 'DASH Video',
 308         '134': 'DASH Video',
 309         '135': 'DASH Video',
 310         '136': 'DASH Video',
 311         '137': 'DASH Video',
 312         '138': 'DASH Video',
 313         '139': 'DASH Audio',
 314         '140': 'DASH Audio',
 315         '141': 'DASH Audio',
 316         '160': 'DASH Video',
 317         '171': 'DASH Audio',
 318         '172': 'DASH Audio',
 319         '242': 'DASH Video',
 320         '243': 'DASH Video',
 321         '244': 'DASH Video',
 322         '245': 'DASH Video',
 323         '246': 'DASH Video',
 324         '247': 'DASH Video',
 325         '248': 'DASH Video',
 326     }
 327
 328     IE_NAME = u'youtube'
 329     _TESTS = [
 330         {
 331             u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
 332             u"file":  u"BaW_jenozKc.mp4",
 333             u"info_dict": {
 334                 u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
 335                 u"uploader": u"Philipp Hagemeister",
 336                 u"uploader_id": u"phihag",
 337                 u"upload_date": u"20121002",
 338                 u"description": u"test chars:  \"'/\\ä↭𝕐\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de ."
 339             }
 340         },
 341         {
 342             u"url":  u"http://www.youtube.com/watch?v=1ltcDfZMA3U",
 343             u"file":  u"1ltcDfZMA3U.flv",
 344             u"note": u"Test VEVO video (#897)",
 345             u"info_dict": {
 346                 u"upload_date": u"20070518",
 347                 u"title": u"Maps - It Will Find You",
 348                 u"description": u"Music video by Maps performing It Will Find You.",
 349                 u"uploader": u"MuteUSA",
 350                 u"uploader_id": u"MuteUSA"
 351             }
 352         },
 353         {
 354             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
 355             u"file":  u"UxxajLWwzqY.mp4",
 356             u"note": u"Test generic use_cipher_signature video (#897)",
 357             u"info_dict": {
 358                 u"upload_date": u"20120506",
 359                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
 360                 u"description": u"md5:3e2666e0a55044490499ea45fe9037b7",
 361                 u"uploader": u"Icona Pop",
 362                 u"uploader_id": u"IconaPop"
 363             }
 364         },
 365         {
 366             u"url":  u"https://www.youtube.com/watch?v=07FYdnEawAQ",
 367             u"file":  u"07FYdnEawAQ.mp4",
 368             u"note": u"Test VEVO video with age protection (#956)",
 369             u"info_dict": {
 370                 u"upload_date": u"20130703",
 371                 u"title": u"Justin Timberlake - Tunnel Vision (Explicit)",
 372                 u"description": u"md5:64249768eec3bc4276236606ea996373",
 373                 u"uploader": u"justintimberlakeVEVO",
 374                 u"uploader_id": u"justintimberlakeVEVO"
 375             }
 376         },
 377         {
 378             u'url': u'https://www.youtube.com/watch?v=TGi3HqYrWHE',
 379             u'file': u'TGi3HqYrWHE.mp4',
 380             u'note': u'm3u8 video',
 381             u'info_dict': {
 382                 u'title': u'Triathlon - Men - London 2012 Olympic Games',
 383                 u'description': u'- Men -  TR02 - Triathlon - 07 August 2012 - London 2012 Olympic Games',
 384                 u'uploader': u'olympic',
 385                 u'upload_date': u'20120807',
 386                 u'uploader_id': u'olympic',
 387             },
 388             u'params': {
 389                 u'skip_download': True,
 390             },
 391         },
 392     ]
 393
 394
 395     @classmethod
 396     def suitable(cls, url):
 397         """Receives a URL and returns True if suitable for this IE."""
 398         if YoutubePlaylistIE.suitable(url): return False
 399         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 400
 401     def __init__(self, *args, **kwargs):
 402         super(YoutubeIE, self).__init__(*args, **kwargs)
 403         self._player_cache = {}
 404
 405     def report_video_webpage_download(self, video_id):
 406         """Report attempt to download video webpage."""
 407         self.to_screen(u'%s: Downloading video webpage' % video_id)
 408
 409     def report_video_info_webpage_download(self, video_id):
 410         """Report attempt to download video info webpage."""
 411         self.to_screen(u'%s: Downloading video info webpage' % video_id)
 412
 413     def report_information_extraction(self, video_id):
 414         """Report attempt to extract video information."""
 415         self.to_screen(u'%s: Extracting video information' % video_id)
 416
 417     def report_unavailable_format(self, video_id, format):
 418         """Report extracted video URL."""
 419         self.to_screen(u'%s: Format %s not available' % (video_id, format))
 420
 421     def report_rtmp_download(self):
 422         """Indicate the download will use the RTMP protocol."""
 423         self.to_screen(u'RTMP download detected')
 424
 425     def _extract_signature_function(self, video_id, player_url):
 426         id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9]+)\.(?P<ext>[a-z]+)$',
 427                         player_url)
 428         player_type = id_m.group('ext')
 429         player_id = id_m.group('id')
 430
 431         # TODO read from filesystem cache
 432
 433         if player_type == 'js':
 434             code = self._download_webpage(
 435                 player_url, video_id,
 436                 note=u'Downloading %s player %s' % (player_type, player_id),
 437                 errnote=u'Download of %s failed' % player_url)
 438             res = self._parse_sig_js(code)
 439         elif player_tpye == 'swf':
 440             urlh = self._request_webpage(
 441                 player_url, video_id,
 442                 note=u'Downloading %s player %s' % (player_type, player_id),
 443                 errnote=u'Download of %s failed' % player_url)
 444             code = urlh.read()
 445             res = self._parse_sig_swf(code)
 446         else:
 447             assert False, 'Invalid player type %r' % player_type
 448
 449         # TODO write cache
 450
 451         return res
 452
 453     def _parse_sig_js(self, jscode):
 454         funcname = self._search_regex(
 455             r'signature=([a-zA-Z]+)', jscode,
 456             u'Initial JS player signature function name')
 457
 458         functions = {}
 459
 460         def argidx(varname):
 461             return string.lowercase.index(varname)
 462
 463         def interpret_statement(stmt, local_vars, allow_recursion=20):
 464             if allow_recursion < 0:
 465                 raise ExctractorError(u'Recursion limit reached')
 466
 467             if stmt.startswith(u'var '):
 468                 stmt = stmt[len(u'var '):]
 469             ass_m = re.match(r'^(?P<out>[a-z]+)(?:\[(?P<index>[^\]]+)\])?' +
 470                              r'=(?P<expr>.*)$', stmt)
 471             if ass_m:
 472                 if ass_m.groupdict().get('index'):
 473                     def assign(val):
 474                         lvar = local_vars[ass_m.group('out')]
 475                         idx = interpret_expression(ass_m.group('index'),
 476                                                    local_vars, allow_recursion)
 477                         assert isinstance(idx, int)
 478                         lvar[idx] = val
 479                         return val
 480                     expr = ass_m.group('expr')
 481                 else:
 482                     def assign(val):
 483                         local_vars[ass_m.group('out')] = val
 484                         return val
 485                     expr = ass_m.group('expr')
 486             elif stmt.startswith(u'return '):
 487                 assign = lambda v: v
 488                 expr = stmt[len(u'return '):]
 489             else:
 490                 raise ExtractorError(
 491                     u'Cannot determine left side of statement in %r' % stmt)
 492
 493             v = interpret_expression(expr, local_vars, allow_recursion)
 494             return assign(v)
 495
 496         def interpret_expression(expr, local_vars, allow_recursion):
 497             if expr.isdigit():
 498                 return int(expr)
 499
 500             if expr.isalpha():
 501                 return local_vars[expr]
 502
 503             m = re.match(r'^(?P<in>[a-z]+)\.(?P<member>.*)$', expr)
 504             if m:
 505                 member = m.group('member')
 506                 val = local_vars[m.group('in')]
 507                 if member == 'split("")':
 508                     return list(val)
 509                 if member == 'join("")':
 510                     return u''.join(val)
 511                 if member == 'length':
 512                     return len(val)
 513                 if member == 'reverse()':
 514                     return val[::-1]
 515                 slice_m = re.match(r'slice\((?P<idx>.*)\)', member)
 516                 if slice_m:
 517                     idx = interpret_expression(
 518                         slice_m.group('idx'), local_vars, allow_recursion-1)
 519                     return val[idx:]
 520
 521             m = re.match(
 522                 r'^(?P<in>[a-z]+)\[(?P<idx>.+)\]$', expr)
 523             if m:
 524                 val = local_vars[m.group('in')]
 525                 idx = interpret_expression(m.group('idx'), local_vars,
 526                                            allow_recursion-1)
 527                 return val[idx]
 528
 529             m = re.match(r'^(?P<a>.+?)(?P<op>[%])(?P<b>.+?)$', expr)
 530             if m:
 531                 a = interpret_expression(m.group('a'),
 532                                          local_vars, allow_recursion)
 533                 b = interpret_expression(m.group('b'),
 534                                          local_vars, allow_recursion)
 535                 return a % b
 536
 537             m = re.match(
 538                 r'^(?P<func>[a-zA-Z]+)\((?P<args>[a-z0-9,]+)\)$', expr)
 539             if m:
 540                 fname = m.group('func')
 541                 if fname not in functions:
 542                     functions[fname] = extract_function(fname)
 543                 argvals = [int(v) if v.isdigit() else local_vars[v]
 544                            for v in m.group('args').split(',')]
 545                 return functions[fname](argvals)
 546             raise ExtractorError(u'Unsupported JS expression %r' % expr)
 547
 548         def extract_function(funcname):
 549             func_m = re.search(
 550                 r'function ' + re.escape(funcname) +
 551                 r'\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}',
 552                 jscode)
 553             argnames = func_m.group('args').split(',')
 554
 555             def resf(args):
 556                 local_vars = dict(zip(argnames, args))
 557                 for stmt in func_m.group('code').split(';'):
 558                     res = interpret_statement(stmt, local_vars)
 559                 return res
 560             return resf
 561
 562         initial_function = extract_function(funcname)
 563         return lambda s: initial_function([s])
 564
 565     def _parse_sig_swf(self, file_contents):
 566         if file_contents[1:3] != b'WS':
 567             raise ExtractorError(
 568                 u'Not an SWF file; header is %r' % file_contents[:3])
 569         if file_contents[:1] == b'C':
 570             content = zlib.decompress(file_contents[8:])
 571         else:
 572             raise NotImplementedError(u'Unsupported compression format %r' %
 573                                       file_contents[:1])
 574
 575         def extract_tags(content):
 576             pos = 0
 577             while pos < len(content):
 578                 header16 = struct.unpack('<H', content[pos:pos+2])[0]
 579                 pos += 2
 580                 tag_code = header16 >> 6
 581                 tag_len = header16 & 0x3f
 582                 if tag_len == 0x3f:
 583                     tag_len = struct.unpack('<I', content[pos:pos+4])[0]
 584                     pos += 4
 585                 assert pos+tag_len <= len(content)
 586                 yield (tag_code, content[pos:pos+tag_len])
 587                 pos += tag_len
 588
 589         code_tag = next(tag
 590                         for tag_code, tag in extract_tags(content)
 591                         if tag_code == 82)
 592         p = code_tag.index(b'\0', 4) + 1
 593         code_reader = io.BytesIO(code_tag[p:])
 594
 595         # Parse ABC (AVM2 ByteCode)
 596         def read_int(reader=None):
 597             if reader is None:
 598                 reader = code_reader
 599             res = 0
 600             shift = 0
 601             for _ in range(5):
 602                 buf = reader.read(1)
 603                 assert len(buf) == 1
 604                 b = struct.unpack('<B', buf)[0]
 605                 res = res | ((b & 0x7f) << shift)
 606                 if b & 0x80 == 0:
 607                     break
 608                 shift += 7
 609             return res
 610
 611         def u30(reader=None):
 612             res = read_int(reader)
 613             assert res & 0xf0000000 == 0
 614             return res
 615         u32 = read_int
 616
 617         def s32(reader=None):
 618             v = read_int(reader)
 619             if v & 0x80000000 != 0:
 620                 v = - ((v ^ 0xffffffff) + 1)
 621             return v
 622
 623         def string(reader=None):
 624             if reader is None:
 625                 reader = code_reader
 626             slen = u30(reader)
 627             resb = reader.read(slen)
 628             assert len(resb) == slen
 629             return resb.decode('utf-8')
 630
 631         def read_bytes(count, reader=None):
 632             if reader is None:
 633                 reader = code_reader
 634             resb = reader.read(count)
 635             assert len(resb) == count
 636             return resb
 637
 638         def read_byte(reader=None):
 639             resb = read_bytes(1, reader=reader)
 640             res = struct.unpack('<B', resb)[0]
 641             return res
 642
 643         # minor_version + major_version
 644         _ = read_bytes(2 + 2)
 645
 646         # Constant pool
 647         int_count = u30()
 648         for _c in range(1, int_count):
 649             _ = s32()
 650         uint_count = u30()
 651         for _c in range(1, uint_count):
 652             _ = u32()
 653         double_count = u30()
 654         _ = read_bytes((double_count-1) * 8)
 655         string_count = u30()
 656         constant_strings = [u'']
 657         for _c in range(1, string_count):
 658             s = string()
 659             constant_strings.append(s)
 660         namespace_count = u30()
 661         for _c in range(1, namespace_count):
 662             _ = read_bytes(1)  # kind
 663             _ = u30()  # name
 664         ns_set_count = u30()
 665         for _c in range(1, ns_set_count):
 666             count = u30()
 667             for _c2 in range(count):
 668                 _ = u30()
 669         multiname_count = u30()
 670         MULTINAME_SIZES = {
 671             0x07: 2,  # QName
 672             0x0d: 2,  # QNameA
 673             0x0f: 1,  # RTQName
 674             0x10: 1,  # RTQNameA
 675             0x11: 0,  # RTQNameL
 676             0x12: 0,  # RTQNameLA
 677             0x09: 2,  # Multiname
 678             0x0e: 2,  # MultinameA
 679             0x1b: 1,  # MultinameL
 680             0x1c: 1,  # MultinameLA
 681         }
 682         multinames = [u'']
 683         for _c in range(1, multiname_count):
 684             kind = u30()
 685             assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind
 686             if kind == 0x07:
 687                 namespace_idx = u30()
 688                 name_idx = u30()
 689                 multinames.append(constant_strings[name_idx])
 690             else:
 691                 multinames.append('[MULTINAME kind: %d]' % kind)
 692                 for _c2 in range(MULTINAME_SIZES[kind]):
 693                     _ = u30()
 694
 695         # Methods
 696         method_count = u30()
 697         MethodInfo = collections.namedtuple(
 698             'MethodInfo',
 699             ['NEED_ARGUMENTS', 'NEED_REST'])
 700         method_infos = []
 701         for method_id in range(method_count):
 702             param_count = u30()
 703             _ = u30()  # return type
 704             for _ in range(param_count):
 705                 _ = u30()  # param type
 706             _ = u30()  # name index (always 0 for youtube)
 707             flags = read_byte()
 708             if flags & 0x08 != 0:
 709                 # Options present
 710                 option_count = u30()
 711                 for c in range(option_count):
 712                     _ = u30()  # val
 713                     _ = read_bytes(1)  # kind
 714             if flags & 0x80 != 0:
 715                 # Param names present
 716                 for _ in range(param_count):
 717                     _ = u30()  # param name
 718             mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
 719             method_infos.append(mi)
 720
 721         # Metadata
 722         metadata_count = u30()
 723         for _c in range(metadata_count):
 724             _ = u30()  # name
 725             item_count = u30()
 726             for _c2 in range(item_count):
 727                 _ = u30()  # key
 728                 _ = u30()  # value
 729
 730         def parse_traits_info():
 731             trait_name_idx = u30()
 732             kind_full = read_byte()
 733             kind = kind_full & 0x0f
 734             attrs = kind_full >> 4
 735             methods = {}
 736             if kind in [0x00, 0x06]:  # Slot or Const
 737                 _ = u30()  # Slot id
 738                 type_name_idx = u30()
 739                 vindex = u30()
 740                 if vindex != 0:
 741                     _ = read_byte()  # vkind
 742             elif kind in [0x01, 0x02, 0x03]:  # Method / Getter / Setter
 743                 _ = u30()  # disp_id
 744                 method_idx = u30()
 745                 methods[multinames[trait_name_idx]] = method_idx
 746             elif kind == 0x04:  # Class
 747                 _ = u30()  # slot_id
 748                 _ = u30()  # classi
 749             elif kind == 0x05:  # Function
 750                 _ = u30()  # slot_id
 751                 function_idx = u30()
 752                 methods[function_idx] = multinames[trait_name_idx]
 753             else:
 754                 raise ExtractorError(u'Unsupported trait kind %d' % kind)
 755
 756             if attrs & 0x4 != 0:  # Metadata present
 757                 metadata_count = u30()
 758                 for _c3 in range(metadata_count):
 759                     _ = u30()
 760
 761             return methods
 762
 763         # Classes
 764         TARGET_CLASSNAME = u'SignatureDecipher'
 765         searched_idx = multinames.index(TARGET_CLASSNAME)
 766         searched_class_id = None
 767         class_count = u30()
 768         for class_id in range(class_count):
 769             name_idx = u30()
 770             if name_idx == searched_idx:
 771                 # We found the class we're looking for!
 772                 searched_class_id = class_id
 773             _ = u30()  # super_name idx
 774             flags = read_byte()
 775             if flags & 0x08 != 0:  # Protected namespace is present
 776                 protected_ns_idx = u30()
 777             intrf_count = u30()
 778             for _c2 in range(intrf_count):
 779                 _ = u30()
 780             _ = u30()  # iinit
 781             trait_count = u30()
 782             for _c2 in range(trait_count):
 783                 _ = parse_traits_info()
 784
 785         if searched_class_id is None:
 786             raise ExtractorError(u'Target class %r not found' %
 787                                  TARGET_CLASSNAME)
 788
 789         method_names = {}
 790         method_idxs = {}
 791         for class_id in range(class_count):
 792             _ = u30()  # cinit
 793             trait_count = u30()
 794             for _c2 in range(trait_count):
 795                 trait_methods = parse_traits_info()
 796                 if class_id == searched_class_id:
 797                     method_names.update(trait_methods.items())
 798                     method_idxs.update(dict(
 799                         (idx, name)
 800                         for name, idx in trait_methods.items()))
 801
 802         # Scripts
 803         script_count = u30()
 804         for _c in range(script_count):
 805             _ = u30()  # init
 806             trait_count = u30()
 807             for _c2 in range(trait_count):
 808                 _ = parse_traits_info()
 809
 810         # Method bodies
 811         method_body_count = u30()
 812         Method = collections.namedtuple('Method', ['code', 'local_count'])
 813         methods = {}
 814         for _c in range(method_body_count):
 815             method_idx = u30()
 816             max_stack = u30()
 817             local_count = u30()
 818             init_scope_depth = u30()
 819             max_scope_depth = u30()
 820             code_length = u30()
 821             code = read_bytes(code_length)
 822             if method_idx in method_idxs:
 823                 m = Method(code, local_count)
 824                 methods[method_idxs[method_idx]] = m
 825             exception_count = u30()
 826             for _c2 in range(exception_count):
 827                 _ = u30()  # from
 828                 _ = u30()  # to
 829                 _ = u30()  # target
 830                 _ = u30()  # exc_type
 831                 _ = u30()  # var_name
 832             trait_count = u30()
 833             for _c2 in range(trait_count):
 834                 _ = parse_traits_info()
 835
 836         assert p + code_reader.tell() == len(code_tag)
 837         assert len(methods) == len(method_idxs)
 838
 839         method_pyfunctions = {}
 840
 841         def extract_function(func_name):
 842             if func_name in method_pyfunctions:
 843                 return method_pyfunctions[func_name]
 844             if func_name not in methods:
 845                 raise ExtractorError(u'Cannot find function %r' % func_name)
 846             m = methods[func_name]
 847
 848             def resfunc(args):
 849                 registers = ['(this)'] + list(args) + [None] * m.local_count
 850                 stack = []
 851                 coder = io.BytesIO(m.code)
 852                 while True:
 853                     opcode = struct.unpack('!B', coder.read(1))[0]
 854                     if opcode == 36:  # pushbyte
 855                         v = struct.unpack('!B', coder.read(1))[0]
 856                         stack.append(v)
 857                     elif opcode == 44:  # pushstring
 858                         idx = u30(coder)
 859                         stack.append(constant_strings[idx])
 860                     elif opcode == 48:  # pushscope
 861                         # We don't implement the scope register, so we'll just
 862                         # ignore the popped value
 863                         stack.pop()
 864                     elif opcode == 70:  # callproperty
 865                         index = u30(coder)
 866                         mname = multinames[index]
 867                         arg_count = u30(coder)
 868                         args = list(reversed(
 869                             [stack.pop() for _ in range(arg_count)]))
 870                         obj = stack.pop()
 871                         if mname == u'split':
 872                             assert len(args) == 1
 873                             assert isinstance(args[0], compat_str)
 874                             assert isinstance(obj, compat_str)
 875                             if args[0] == u'':
 876                                 res = list(obj)
 877                             else:
 878                                 res = obj.split(args[0])
 879                             stack.append(res)
 880                         elif mname == u'slice':
 881                             assert len(args) == 1
 882                             assert isinstance(args[0], int)
 883                             assert isinstance(obj, list)
 884                             res = obj[args[0]:]
 885                             stack.append(res)
 886                         elif mname == u'join':
 887                             assert len(args) == 1
 888                             assert isinstance(args[0], compat_str)
 889                             assert isinstance(obj, list)
 890                             res = args[0].join(obj)
 891                             stack.append(res)
 892                         elif mname in method_pyfunctions:
 893                             stack.append(method_pyfunctions[mname](args))
 894                         else:
 895                             raise NotImplementedError(
 896                                 u'Unsupported property %r on %r'
 897                                 % (mname, obj))
 898                     elif opcode == 72:  # returnvalue
 899                         res = stack.pop()
 900                         return res
 901                     elif opcode == 79:  # callpropvoid
 902                         index = u30(coder)
 903                         mname = multinames[index]
 904                         arg_count = u30(coder)
 905                         args = list(reversed(
 906                             [stack.pop() for _ in range(arg_count)]))
 907                         obj = stack.pop()
 908                         if mname == u'reverse':
 909                             assert isinstance(obj, list)
 910                             obj.reverse()
 911                         else:
 912                             raise NotImplementedError(
 913                                 u'Unsupported (void) property %r on %r'
 914                                 % (mname, obj))
 915                     elif opcode == 93:  # findpropstrict
 916                         index = u30(coder)
 917                         mname = multinames[index]
 918                         res = extract_function(mname)
 919                         stack.append(res)
 920                     elif opcode == 97:  # setproperty
 921                         index = u30(coder)
 922                         value = stack.pop()
 923                         idx = stack.pop()
 924                         obj = stack.pop()
 925                         assert isinstance(obj, list)
 926                         assert isinstance(idx, int)
 927                         obj[idx] = value
 928                     elif opcode == 98:  # getlocal
 929                         index = u30(coder)
 930                         stack.append(registers[index])
 931                     elif opcode == 99:  # setlocal
 932                         index = u30(coder)
 933                         value = stack.pop()
 934                         registers[index] = value
 935                     elif opcode == 102:  # getproperty
 936                         index = u30(coder)
 937                         pname = multinames[index]
 938                         if pname == u'length':
 939                             obj = stack.pop()
 940                             assert isinstance(obj, list)
 941                             stack.append(len(obj))
 942                         else:  # Assume attribute access
 943                             idx = stack.pop()
 944                             assert isinstance(idx, int)
 945                             obj = stack.pop()
 946                             assert isinstance(obj, list)
 947                             stack.append(obj[idx])
 948                     elif opcode == 128:  # coerce
 949                         _ = u30(coder)
 950                     elif opcode == 133:  # coerce_s
 951                         assert isinstance(stack[-1], (type(None), compat_str))
 952                     elif opcode == 164:  # modulo
 953                         value2 = stack.pop()
 954                         value1 = stack.pop()
 955                         res = value1 % value2
 956                         stack.append(res)
 957                     elif opcode == 208:  # getlocal_0
 958                         stack.append(registers[0])
 959                     elif opcode == 209:  # getlocal_1
 960                         stack.append(registers[1])
 961                     elif opcode == 210:  # getlocal_2
 962                         stack.append(registers[2])
 963                     elif opcode == 211:  # getlocal_3
 964                         stack.append(registers[3])
 965                     elif opcode == 214:  # setlocal_2
 966                         registers[2] = stack.pop()
 967                     elif opcode == 215:  # setlocal_3
 968                         registers[3] = stack.pop()
 969                     else:
 970                         raise NotImplementedError(
 971                             u'Unsupported opcode %d' % opcode)
 972
 973             method_pyfunctions[func_name] = resfunc
 974             return resfunc
 975
 976         initial_function = extract_function(u'decipher')
 977         return lambda s: initial_function([s])
 978
 979     def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
 980         """Turn the encrypted s field into a working signature"""
 981
 982         if player_url is not None:
 983             try:
 984                 if player_url not in self._player_cache:
 985                     func = self._extract_signature_function(
 986                         video_id, player_url
 987                     )
 988                     self._player_cache[player_url] = func
 989                 return self._player_cache[player_url](s)
 990             except Exception as e:
 991                 tb = traceback.format_exc()
 992                 self._downloader.report_warning(
 993                     u'Automatic signature extraction failed: ' + tb)
 994
 995         self._downloader.report_warning(
 996             u'Warning: Falling back to static signature algorithm')
 997         return self._static_decrypt_signature(
 998             s, video_id, player_url, age_gate)
 999
1000     def _static_decrypt_signature(self, s, video_id, player_url, age_gate):
1001         if age_gate:
1002             # The videos with age protection use another player, so the
1003             # algorithms can be different.
1004             if len(s) == 86:
1005                 return s[2:63] + s[82] + s[64:82] + s[63]
1006
1007         if len(s) == 92:
1008             return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
1009         elif len(s) == 90:
1010             return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
1011         elif len(s) == 89:
1012             return s[84:78:-1] + s[87] + s[77:60:-1] + s[0] + s[59:3:-1]
1013         elif len(s) == 88:
1014             return s[7:28] + s[87] + s[29:45] + s[55] + s[46:55] + s[2] + s[56:87] + s[28]
1015         elif len(s) == 87:
1016             return s[6:27] + s[4] + s[28:39] + s[27] + s[40:59] + s[2] + s[60:]
1017         elif len(s) == 86:
1018             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]
1019         elif len(s) == 85:
1020             return s[3:11] + s[0] + s[12:55] + s[84] + s[56:84]
1021         elif len(s) == 84:
1022             return s[81:36:-1] + s[0] + s[35:2:-1]
1023         elif len(s) == 83:
1024             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]
1025         elif len(s) == 82:
1026             return s[80:73:-1] + s[81] + s[72:54:-1] + s[2] + s[53:43:-1] + s[0] + s[42:2:-1] + s[43] + s[1] + s[54]
1027         elif len(s) == 81:
1028             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]
1029         elif len(s) == 80:
1030             return s[1:19] + s[0] + s[20:68] + s[19] + s[69:80]
1031         elif len(s) == 79:
1032             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]
1033
1034         else:
1035             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
1036
1037     def _decrypt_signature_age_gate(self, s):
1038         # The videos with age protection use another player, so the algorithms
1039         # can be different.
1040         if len(s) == 86:
1041             return s[2:63] + s[82] + s[64:82] + s[63]
1042         else:
1043             # Fallback to the other algortihms
1044             return self._decrypt_signature(s)
1045
1046     def _get_available_subtitles(self, video_id):
1047         try:
1048             sub_list = self._download_webpage(
1049                 'http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id,
1050                 video_id, note=False)
1051         except ExtractorError as err:
1052             self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
1053             return {}
1054         lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
1055
1056         sub_lang_list = {}
1057         for l in lang_list:
1058             lang = l[1]
1059             params = compat_urllib_parse.urlencode({
1060                 'lang': lang,
1061                 'v': video_id,
1062                 'fmt': self._downloader.params.get('subtitlesformat'),
1063             })
1064             url = u'http://www.youtube.com/api/timedtext?' + params
1065             sub_lang_list[lang] = url
1066         if not sub_lang_list:
1067             self._downloader.report_warning(u'video doesn\'t have subtitles')
1068             return {}
1069         return sub_lang_list
1070
1071     def _get_available_automatic_caption(self, video_id, webpage):
1072         """We need the webpage for getting the captions url, pass it as an
1073            argument to speed up the process."""
1074         sub_format = self._downloader.params.get('subtitlesformat')
1075         self.to_screen(u'%s: Looking for automatic captions' % video_id)
1076         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
1077         err_msg = u'Couldn\'t find automatic captions for %s' % video_id
1078         if mobj is None:
1079             self._downloader.report_warning(err_msg)
1080             return {}
1081         player_config = json.loads(mobj.group(1))
1082         try:
1083             args = player_config[u'args']
1084             caption_url = args[u'ttsurl']
1085             timestamp = args[u'timestamp']
1086             # We get the available subtitles
1087             list_params = compat_urllib_parse.urlencode({
1088                 'type': 'list',
1089                 'tlangs': 1,
1090                 'asrs': 1,
1091             })
1092             list_url = caption_url + '&' + list_params
1093             list_page = self._download_webpage(list_url, video_id)
1094             caption_list = xml.etree.ElementTree.fromstring(list_page.encode('utf-8'))
1095             original_lang_node = caption_list.find('track')
1096             if original_lang_node.attrib.get('kind') != 'asr' :
1097                 self._downloader.report_warning(u'Video doesn\'t have automatic captions')
1098                 return {}
1099             original_lang = original_lang_node.attrib['lang_code']
1100
1101             sub_lang_list = {}
1102             for lang_node in caption_list.findall('target'):
1103                 sub_lang = lang_node.attrib['lang_code']
1104                 params = compat_urllib_parse.urlencode({
1105                     'lang': original_lang,
1106                     'tlang': sub_lang,
1107                     'fmt': sub_format,
1108                     'ts': timestamp,
1109                     'kind': 'asr',
1110                 })
1111                 sub_lang_list[sub_lang] = caption_url + '&' + params
1112             return sub_lang_list
1113         # An extractor error can be raise by the download process if there are
1114         # no automatic captions but there are subtitles
1115         except (KeyError, ExtractorError):
1116             self._downloader.report_warning(err_msg)
1117             return {}
1118
1119     def _print_formats(self, formats):
1120         print('Available formats:')
1121         for x in formats:
1122             print('%s\t:\t%s\t[%s]%s' %(x, self._video_extensions.get(x, 'flv'),
1123                                         self._video_dimensions.get(x, '???'),
1124                                         ' ('+self._special_itags[x]+')' if x in self._special_itags else ''))
1125
1126     def _extract_id(self, url):
1127         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
1128         if mobj is None:
1129             raise ExtractorError(u'Invalid URL: %s' % url)
1130         video_id = mobj.group(2)
1131         return video_id
1132
1133     def _get_video_url_list(self, url_map):
1134         """
1135         Transform a dictionary in the format {itag:url} to a list of (itag, url)
1136         with the requested formats.
1137         """
1138         req_format = self._downloader.params.get('format', None)
1139         format_limit = self._downloader.params.get('format_limit', None)
1140         available_formats = self._available_formats_prefer_free if self._downloader.params.get('prefer_free_formats', False) else self._available_formats
1141         if format_limit is not None and format_limit in available_formats:
1142             format_list = available_formats[available_formats.index(format_limit):]
1143         else:
1144             format_list = available_formats
1145         existing_formats = [x for x in format_list if x in url_map]
1146         if len(existing_formats) == 0:
1147             raise ExtractorError(u'no known formats available for video')
1148         if self._downloader.params.get('listformats', None):
1149             self._print_formats(existing_formats)
1150             return
1151         if req_format is None or req_format == 'best':
1152             video_url_list = [(existing_formats[0], url_map[existing_formats[0]])] # Best quality
1153         elif req_format == 'worst':
1154             video_url_list = [(existing_formats[-1], url_map[existing_formats[-1]])] # worst quality
1155         elif req_format in ('-1', 'all'):
1156             video_url_list = [(f, url_map[f]) for f in existing_formats] # All formats
1157         else:
1158             # Specific formats. We pick the first in a slash-delimeted sequence.
1159             # Format can be specified as itag or 'mp4' or 'flv' etc. We pick the highest quality
1160             # available in the specified format. For example,
1161             # if '1/2/3/4' is requested and '2' and '4' are available, we pick '2'.
1162             # if '1/mp4/3/4' is requested and '1' and '5' (is a mp4) are available, we pick '1'.
1163             # if '1/mp4/3/4' is requested and '4' and '5' (is a mp4) are available, we pick '5'.
1164             req_formats = req_format.split('/')
1165             video_url_list = None
1166             for rf in req_formats:
1167                 if rf in url_map:
1168                     video_url_list = [(rf, url_map[rf])]
1169                     break
1170                 if rf in self._video_formats_map:
1171                     for srf in self._video_formats_map[rf]:
1172                         if srf in url_map:
1173                             video_url_list = [(srf, url_map[srf])]
1174                             break
1175                     else:
1176                         continue
1177                     break
1178             if video_url_list is None:
1179                 raise ExtractorError(u'requested format not available')
1180         return video_url_list
1181
1182     def _extract_from_m3u8(self, manifest_url, video_id):
1183         url_map = {}
1184         def _get_urls(_manifest):
1185             lines = _manifest.split('\n')
1186             urls = filter(lambda l: l and not l.startswith('#'),
1187                             lines)
1188             return urls
1189         manifest = self._download_webpage(manifest_url, video_id, u'Downloading formats manifest')
1190         formats_urls = _get_urls(manifest)
1191         for format_url in formats_urls:
1192             itag = self._search_regex(r'itag/(\d+?)/', format_url, 'itag')
1193             url_map[itag] = format_url
1194         return url_map
1195
1196     def _real_extract(self, url):
1197         if re.match(r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$', url):
1198             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  ).')
1199
1200         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
1201         mobj = re.search(self._NEXT_URL_RE, url)
1202         if mobj:
1203             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
1204         video_id = self._extract_id(url)
1205
1206         # Get video webpage
1207         self.report_video_webpage_download(video_id)
1208         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
1209         request = compat_urllib_request.Request(url)
1210         try:
1211             video_webpage_bytes = compat_urllib_request.urlopen(request).read()
1212         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
1213             raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err))
1214
1215         video_webpage = video_webpage_bytes.decode('utf-8', 'ignore')
1216
1217         # Attempt to extract SWF player URL
1218         mobj = re.search(r'swfConfig.*?"(https?:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
1219         if mobj is not None:
1220             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
1221         else:
1222             player_url = None
1223
1224         # Get video info
1225         self.report_video_info_webpage_download(video_id)
1226         if re.search(r'player-age-gate-content">', video_webpage) is not None:
1227             self.report_age_confirmation()
1228             age_gate = True
1229             # We simulate the access to the video from www.youtube.com/v/{video_id}
1230             # this can be viewed without login into Youtube
1231             data = compat_urllib_parse.urlencode({'video_id': video_id,
1232                                                   'el': 'embedded',
1233                                                   'gl': 'US',
1234                                                   'hl': 'en',
1235                                                   'eurl': 'https://youtube.googleapis.com/v/' + video_id,
1236                                                   'asv': 3,
1237                                                   'sts':'1588',
1238                                                   })
1239             video_info_url = 'https://www.youtube.com/get_video_info?' + data
1240             video_info_webpage = self._download_webpage(video_info_url, video_id,
1241                                     note=False,
1242                                     errnote='unable to download video info webpage')
1243             video_info = compat_parse_qs(video_info_webpage)
1244         else:
1245             age_gate = False
1246             for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
1247                 video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
1248                         % (video_id, el_type))
1249                 video_info_webpage = self._download_webpage(video_info_url, video_id,
1250                                         note=False,
1251                                         errnote='unable to download video info webpage')
1252                 video_info = compat_parse_qs(video_info_webpage)
1253                 if 'token' in video_info:
1254                     break
1255         if 'token' not in video_info:
1256             if 'reason' in video_info:
1257                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0], expected=True)
1258             else:
1259                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
1260
1261         # Check for "rental" videos
1262         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
1263             raise ExtractorError(u'"rental" videos not supported')
1264
1265         # Start extracting information
1266         self.report_information_extraction(video_id)
1267
1268         # uploader
1269         if 'author' not in video_info:
1270             raise ExtractorError(u'Unable to extract uploader name')
1271         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
1272
1273         # uploader_id
1274         video_uploader_id = None
1275         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
1276         if mobj is not None:
1277             video_uploader_id = mobj.group(1)
1278         else:
1279             self._downloader.report_warning(u'unable to extract uploader nickname')
1280
1281         # title
1282         if 'title' not in video_info:
1283             raise ExtractorError(u'Unable to extract video title')
1284         video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
1285
1286         # thumbnail image
1287         # We try first to get a high quality image:
1288         m_thumb = re.search(r'<span itemprop="thumbnail".*?href="(.*?)">',
1289                             video_webpage, re.DOTALL)
1290         if m_thumb is not None:
1291             video_thumbnail = m_thumb.group(1)
1292         elif 'thumbnail_url' not in video_info:
1293             self._downloader.report_warning(u'unable to extract video thumbnail')
1294             video_thumbnail = ''
1295         else:   # don't panic if we can't find it
1296             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
1297
1298         # upload date
1299         upload_date = None
1300         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
1301         if mobj is not None:
1302             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
1303             upload_date = unified_strdate(upload_date)
1304
1305         # description
1306         video_description = get_element_by_id("eow-description", video_webpage)
1307         if video_description:
1308             video_description = clean_html(video_description)
1309         else:
1310             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
1311             if fd_mobj:
1312                 video_description = unescapeHTML(fd_mobj.group(1))
1313             else:
1314                 video_description = u''
1315
1316         # subtitles
1317         video_subtitles = self.extract_subtitles(video_id, video_webpage)
1318
1319         if self._downloader.params.get('listsubtitles', False):
1320             self._list_available_subtitles(video_id, video_webpage)
1321             return
1322
1323         if 'length_seconds' not in video_info:
1324             self._downloader.report_warning(u'unable to extract video duration')
1325             video_duration = ''
1326         else:
1327             video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
1328
1329         # Decide which formats to download
1330
1331         try:
1332             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
1333             if not mobj:
1334                 raise ValueError('Could not find vevo ID')
1335             info = json.loads(mobj.group(1))
1336             args = info['args']
1337             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
1338             # this signatures are encrypted
1339             m_s = re.search(r'[&,]s=', args['url_encoded_fmt_stream_map'])
1340             if m_s is not None:
1341                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
1342                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
1343             m_s = re.search(r'[&,]s=', args.get('adaptive_fmts', u''))
1344             if m_s is not None:
1345                 if 'url_encoded_fmt_stream_map' in video_info:
1346                     video_info['url_encoded_fmt_stream_map'][0] += ',' + args['adaptive_fmts']
1347                 else:
1348                     video_info['url_encoded_fmt_stream_map'] = [args['adaptive_fmts']]
1349             elif 'adaptive_fmts' in video_info:
1350                 if 'url_encoded_fmt_stream_map' in video_info:
1351                     video_info['url_encoded_fmt_stream_map'][0] += ',' + video_info['adaptive_fmts'][0]
1352                 else:
1353                     video_info['url_encoded_fmt_stream_map'] = video_info['adaptive_fmts']
1354         except ValueError:
1355             pass
1356
1357         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
1358             self.report_rtmp_download()
1359             video_url_list = [(None, video_info['conn'][0])]
1360         elif 'url_encoded_fmt_stream_map' in video_info and len(video_info['url_encoded_fmt_stream_map']) >= 1:
1361             if 'rtmpe%3Dyes' in video_info['url_encoded_fmt_stream_map'][0]:
1362                 raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
1363             url_map = {}
1364             for url_data_str in video_info['url_encoded_fmt_stream_map'][0].split(','):
1365                 url_data = compat_parse_qs(url_data_str)
1366                 if 'itag' in url_data and 'url' in url_data:
1367                     url = url_data['url'][0]
1368                     if 'sig' in url_data:
1369                         url += '&signature=' + url_data['sig'][0]
1370                     elif 's' in url_data:
1371                         encrypted_sig = url_data['s'][0]
1372                         if self._downloader.params.get('verbose'):
1373                             if age_gate:
1374                                 player_version = self._search_regex(
1375                                     r'-(.+)\.swf$',
1376                                     player_url if player_url else None,
1377                                     'flash player', fatal=False)
1378                                 player_desc = 'flash player %s' % player_version
1379                             else:
1380                                 player_version = self._search_regex(
1381                                     r'html5player-(.+?)\.js', video_webpage,
1382                                     'html5 player', fatal=False)
1383                                 player_desc = u'html5 player %s' % player_version
1384
1385                             parts_sizes = u'.'.join(compat_str(len(part)) for part in encrypted_sig.split('.'))
1386                             self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
1387                                 (len(encrypted_sig), parts_sizes, url_data['itag'][0], player_desc))
1388
1389                         if not age_gate:
1390                             jsplayer_url_json = self._search_regex(
1391                                 r'"assets":.+?"js":\s*("[^"]+")',
1392                                 video_webpage, u'JS player URL')
1393                             player_url = json.loads(jsplayer_url_json)
1394
1395                         signature = self._decrypt_signature(
1396                             encrypted_sig, video_id, player_url, age_gate)
1397                         url += '&signature=' + signature
1398                     if 'ratebypass' not in url:
1399                         url += '&ratebypass=yes'
1400                     url_map[url_data['itag'][0]] = url
1401             video_url_list = self._get_video_url_list(url_map)
1402             if not video_url_list:
1403                 return
1404         elif video_info.get('hlsvp'):
1405             manifest_url = video_info['hlsvp'][0]
1406             url_map = self._extract_from_m3u8(manifest_url, video_id)
1407             video_url_list = self._get_video_url_list(url_map)
1408             if not video_url_list:
1409                 return
1410
1411         else:
1412             raise ExtractorError(u'no conn or url_encoded_fmt_stream_map information found in video info')
1413
1414         results = []
1415         for format_param, video_real_url in video_url_list:
1416             # Extension
1417             video_extension = self._video_extensions.get(format_param, 'flv')
1418
1419             video_format = '{0} - {1}{2}'.format(format_param if format_param else video_extension,
1420                                               self._video_dimensions.get(format_param, '???'),
1421                                               ' ('+self._special_itags[format_param]+')' if format_param in self._special_itags else '')
1422
1423             results.append({
1424                 'id':       video_id,
1425                 'url':      video_real_url,
1426                 'uploader': video_uploader,
1427                 'uploader_id': video_uploader_id,
1428                 'upload_date':  upload_date,
1429                 'title':    video_title,
1430                 'ext':      video_extension,
1431                 'format':   video_format,
1432                 'thumbnail':    video_thumbnail,
1433                 'description':  video_description,
1434                 'player_url':   player_url,
1435                 'subtitles':    video_subtitles,
1436                 'duration':     video_duration
1437             })
1438         return results
1439
1440 class YoutubePlaylistIE(InfoExtractor):
1441     IE_DESC = u'YouTube.com playlists'
1442     _VALID_URL = r"""(?:
1443                         (?:https?://)?
1444                         (?:\w+\.)?
1445                         youtube\.com/
1446                         (?:
1447                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
1448                            \? (?:.*?&)*? (?:p|a|list)=
1449                         |  p/
1450                         )
1451                         ((?:PL|EC|UU|FL)?[0-9A-Za-z-_]{10,})
1452                         .*
1453                      |
1454                         ((?:PL|EC|UU|FL)[0-9A-Za-z-_]{10,})
1455                      )"""
1456     _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/playlists/%s?max-results=%i&start-index=%i&v=2&alt=json&safeSearch=none'
1457     _MAX_RESULTS = 50
1458     IE_NAME = u'youtube:playlist'
1459
1460     @classmethod
1461     def suitable(cls, url):
1462         """Receives a URL and returns True if suitable for this IE."""
1463         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
1464
1465     def _real_extract(self, url):
1466         # Extract playlist id
1467         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
1468         if mobj is None:
1469             raise ExtractorError(u'Invalid URL: %s' % url)
1470
1471         # Download playlist videos from API
1472         playlist_id = mobj.group(1) or mobj.group(2)
1473         videos = []
1474
1475         for page_num in itertools.count(1):
1476             start_index = self._MAX_RESULTS * (page_num - 1) + 1
1477             if start_index >= 1000:
1478                 self._downloader.report_warning(u'Max number of results reached')
1479                 break
1480             url = self._TEMPLATE_URL % (playlist_id, self._MAX_RESULTS, start_index)
1481             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
1482
1483             try:
1484                 response = json.loads(page)
1485             except ValueError as err:
1486                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
1487
1488             if 'feed' not in response:
1489                 raise ExtractorError(u'Got a malformed response from YouTube API')
1490             playlist_title = response['feed']['title']['$t']
1491             if 'entry' not in response['feed']:
1492                 # Number of videos is a multiple of self._MAX_RESULTS
1493                 break
1494
1495             for entry in response['feed']['entry']:
1496                 index = entry['yt$position']['$t']
1497                 if 'media$group' in entry and 'yt$videoid' in entry['media$group']:
1498                     videos.append((
1499                         index,
1500                         'https://www.youtube.com/watch?v=' + entry['media$group']['yt$videoid']['$t']
1501                     ))
1502
1503         videos = [v[1] for v in sorted(videos)]
1504
1505         url_results = [self.url_result(vurl, 'Youtube') for vurl in videos]
1506         return [self.playlist_result(url_results, playlist_id, playlist_title)]
1507
1508
1509 class YoutubeChannelIE(InfoExtractor):
1510     IE_DESC = u'YouTube.com channels'
1511     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
1512     _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
1513     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
1514     _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'
1515     IE_NAME = u'youtube:channel'
1516
1517     def extract_videos_from_page(self, page):
1518         ids_in_page = []
1519         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
1520             if mobj.group(1) not in ids_in_page:
1521                 ids_in_page.append(mobj.group(1))
1522         return ids_in_page
1523
1524     def _real_extract(self, url):
1525         # Extract channel id
1526         mobj = re.match(self._VALID_URL, url)
1527         if mobj is None:
1528             raise ExtractorError(u'Invalid URL: %s' % url)
1529
1530         # Download channel page
1531         channel_id = mobj.group(1)
1532         video_ids = []
1533         pagenum = 1
1534
1535         url = self._TEMPLATE_URL % (channel_id, pagenum)
1536         page = self._download_webpage(url, channel_id,
1537                                       u'Downloading page #%s' % pagenum)
1538
1539         # Extract video identifiers
1540         ids_in_page = self.extract_videos_from_page(page)
1541         video_ids.extend(ids_in_page)
1542
1543         # Download any subsequent channel pages using the json-based channel_ajax query
1544         if self._MORE_PAGES_INDICATOR in page:
1545             for pagenum in itertools.count(1):
1546                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
1547                 page = self._download_webpage(url, channel_id,
1548                                               u'Downloading page #%s' % pagenum)
1549
1550                 page = json.loads(page)
1551
1552                 ids_in_page = self.extract_videos_from_page(page['content_html'])
1553                 video_ids.extend(ids_in_page)
1554
1555                 if self._MORE_PAGES_INDICATOR  not in page['load_more_widget_html']:
1556                     break
1557
1558         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
1559
1560         urls = ['http://www.youtube.com/watch?v=%s' % id for id in video_ids]
1561         url_entries = [self.url_result(eurl, 'Youtube') for eurl in urls]
1562         return [self.playlist_result(url_entries, channel_id)]
1563
1564
1565 class YoutubeUserIE(InfoExtractor):
1566     IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
1567     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?)|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
1568     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
1569     _GDATA_PAGE_SIZE = 50
1570     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d&alt=json'
1571     IE_NAME = u'youtube:user'
1572
1573     @classmethod
1574     def suitable(cls, url):
1575         # Don't return True if the url can be extracted with other youtube
1576         # extractor, the regex would is too permissive and it would match.
1577         other_ies = iter(klass for (name, klass) in globals().items() if name.endswith('IE') and klass is not cls)
1578         if any(ie.suitable(url) for ie in other_ies): return False
1579         else: return super(YoutubeUserIE, cls).suitable(url)
1580
1581     def _real_extract(self, url):
1582         # Extract username
1583         mobj = re.match(self._VALID_URL, url)
1584         if mobj is None:
1585             raise ExtractorError(u'Invalid URL: %s' % url)
1586
1587         username = mobj.group(1)
1588
1589         # Download video ids using YouTube Data API. Result size per
1590         # query is limited (currently to 50 videos) so we need to query
1591         # page by page until there are no video ids - it means we got
1592         # all of them.
1593
1594         video_ids = []
1595
1596         for pagenum in itertools.count(0):
1597             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
1598
1599             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
1600             page = self._download_webpage(gdata_url, username,
1601                                           u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
1602
1603             try:
1604                 response = json.loads(page)
1605             except ValueError as err:
1606                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
1607             if 'entry' not in response['feed']:
1608                 # Number of videos is a multiple of self._MAX_RESULTS
1609                 break
1610
1611             # Extract video identifiers
1612             ids_in_page = []
1613             for entry in response['feed']['entry']:
1614                 ids_in_page.append(entry['id']['$t'].split('/')[-1])
1615             video_ids.extend(ids_in_page)
1616
1617             # A little optimization - if current page is not
1618             # "full", ie. does not contain PAGE_SIZE video ids then
1619             # we can assume that this page is the last one - there
1620             # are no more ids on further pages - no need to query
1621             # again.
1622
1623             if len(ids_in_page) < self._GDATA_PAGE_SIZE:
1624                 break
1625
1626         urls = ['http://www.youtube.com/watch?v=%s' % video_id for video_id in video_ids]
1627         url_results = [self.url_result(rurl, 'Youtube') for rurl in urls]
1628         return [self.playlist_result(url_results, playlist_title = username)]
1629
1630 class YoutubeSearchIE(SearchInfoExtractor):
1631     IE_DESC = u'YouTube.com searches'
1632     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
1633     _MAX_RESULTS = 1000
1634     IE_NAME = u'youtube:search'
1635     _SEARCH_KEY = 'ytsearch'
1636
1637     def report_download_page(self, query, pagenum):
1638         """Report attempt to download search page with given number."""
1639         self._downloader.to_screen(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
1640
1641     def _get_n_results(self, query, n):
1642         """Get a specified number of results for a query"""
1643
1644         video_ids = []
1645         pagenum = 0
1646         limit = n
1647
1648         while (50 * pagenum) < limit:
1649             self.report_download_page(query, pagenum+1)
1650             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
1651             request = compat_urllib_request.Request(result_url)
1652             try:
1653                 data = compat_urllib_request.urlopen(request).read().decode('utf-8')
1654             except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
1655                 raise ExtractorError(u'Unable to download API page: %s' % compat_str(err))
1656             api_response = json.loads(data)['data']
1657
1658             if not 'items' in api_response:
1659                 raise ExtractorError(u'[youtube] No video results')
1660
1661             new_ids = list(video['id'] for video in api_response['items'])
1662             video_ids += new_ids
1663
1664             limit = min(n, api_response['totalItems'])
1665             pagenum += 1
1666
1667         if len(video_ids) > n:
1668             video_ids = video_ids[:n]
1669         videos = [self.url_result('http://www.youtube.com/watch?v=%s' % id, 'Youtube') for id in video_ids]
1670         return self.playlist_result(videos, query)
1671
1672
1673 class YoutubeShowIE(InfoExtractor):
1674     IE_DESC = u'YouTube.com (multi-season) shows'
1675     _VALID_URL = r'https?://www\.youtube\.com/show/(.*)'
1676     IE_NAME = u'youtube:show'
1677
1678     def _real_extract(self, url):
1679         mobj = re.match(self._VALID_URL, url)
1680         show_name = mobj.group(1)
1681         webpage = self._download_webpage(url, show_name, u'Downloading show webpage')
1682         # There's one playlist for each season of the show
1683         m_seasons = list(re.finditer(r'href="(/playlist\?list=.*?)"', webpage))
1684         self.to_screen(u'%s: Found %s seasons' % (show_name, len(m_seasons)))
1685         return [self.url_result('https://www.youtube.com' + season.group(1), 'YoutubePlaylist') for season in m_seasons]
1686
1687
1688 class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
1689     """
1690     Base class for extractors that fetch info from
1691     http://www.youtube.com/feed_ajax
1692     Subclasses must define the _FEED_NAME and _PLAYLIST_TITLE properties.
1693     """
1694     _LOGIN_REQUIRED = True
1695     _PAGING_STEP = 30
1696     # use action_load_personal_feed instead of action_load_system_feed
1697     _PERSONAL_FEED = False
1698
1699     @property
1700     def _FEED_TEMPLATE(self):
1701         action = 'action_load_system_feed'
1702         if self._PERSONAL_FEED:
1703             action = 'action_load_personal_feed'
1704         return 'http://www.youtube.com/feed_ajax?%s=1&feed_name=%s&paging=%%s' % (action, self._FEED_NAME)
1705
1706     @property
1707     def IE_NAME(self):
1708         return u'youtube:%s' % self._FEED_NAME
1709
1710     def _real_initialize(self):
1711         self._login()
1712
1713     def _real_extract(self, url):
1714         feed_entries = []
1715         # The step argument is available only in 2.7 or higher
1716         for i in itertools.count(0):
1717             paging = i*self._PAGING_STEP
1718             info = self._download_webpage(self._FEED_TEMPLATE % paging,
1719                                           u'%s feed' % self._FEED_NAME,
1720                                           u'Downloading page %s' % i)
1721             info = json.loads(info)
1722             feed_html = info['feed_html']
1723             m_ids = re.finditer(r'"/watch\?v=(.*?)["&]', feed_html)
1724             ids = orderedSet(m.group(1) for m in m_ids)
1725             feed_entries.extend(self.url_result(id, 'Youtube') for id in ids)
1726             if info['paging'] is None:
1727                 break
1728         return self.playlist_result(feed_entries, playlist_title=self._PLAYLIST_TITLE)
1729
1730 class YoutubeSubscriptionsIE(YoutubeFeedsInfoExtractor):
1731     IE_DESC = u'YouTube.com subscriptions feed, "ytsubs" keyword(requires authentication)'
1732     _VALID_URL = r'https?://www\.youtube\.com/feed/subscriptions|:ytsubs(?:criptions)?'
1733     _FEED_NAME = 'subscriptions'
1734     _PLAYLIST_TITLE = u'Youtube Subscriptions'
1735
1736 class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
1737     IE_DESC = u'YouTube.com recommended videos, "ytrec" keyword (requires authentication)'
1738     _VALID_URL = r'https?://www\.youtube\.com/feed/recommended|:ytrec(?:ommended)?'
1739     _FEED_NAME = 'recommended'
1740     _PLAYLIST_TITLE = u'Youtube Recommended videos'
1741
1742 class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
1743     IE_DESC = u'Youtube watch later list, "ytwatchlater" keyword (requires authentication)'
1744     _VALID_URL = r'https?://www\.youtube\.com/feed/watch_later|:ytwatchlater'
1745     _FEED_NAME = 'watch_later'
1746     _PLAYLIST_TITLE = u'Youtube Watch Later'
1747     _PAGING_STEP = 100
1748     _PERSONAL_FEED = True
1749
1750 class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
1751     IE_NAME = u'youtube:favorites'
1752     IE_DESC = u'YouTube.com favourite videos, "ytfav" keyword (requires authentication)'
1753     _VALID_URL = r'https?://www\.youtube\.com/my_favorites|:ytfav(?:ou?rites)?'
1754     _LOGIN_REQUIRED = True
1755
1756     def _real_extract(self, url):
1757         webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
1758         playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, u'favourites playlist id')
1759         return self.url_result(playlist_id, 'YoutubePlaylist')