Merge 47f1d701497105778f4f9213429612e88a3a23e3 into 2b4fbfce25902d557b86b003cf48f738129efce4

thx seproDev, bashonly: yt-dlp/yt-dlp#12748

test/test_youtube_signature.py

@@ -84,6 +84,21 @@ _SIG_TESTS = [
         '2aq0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpzEICs69VdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
         '0QJ8wRAIgXmPlOPSBkkUs1bYFYlJCfe29xxAj7v1pDL0QwbdV96sCIEzpWqMGkFR20CFOg51Tp-7vj_EMu-m37KtXJ2OySqa0q',
     ),
+    (
+        'https://www.youtube.com/s/player/643afba4/tv-player-ias.vflset/tv-player-ias.js',
+        '2aq0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpzEICs69VdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
+        'AAOAOq0QJ8wRAIgXmPlOPSBkkUs1bYFYlJCfe29xx8j7vgpDL0QwbdV06sCIEzpWqMGkFR20CFOS21Tp-7vj_EMu-m37KtXJoOy1',
+    ),
+    (
+        'https://www.youtube.com/s/player/363db69b/player_ias.vflset/en_US/base.js',
+        '2aq0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpzEICs69VdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
+        '0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpz2ICs6EVdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
+    ),
+    (
+        'https://www.youtube.com/s/player/4fcd6e4a/player_ias.vflset/en_US/base.js',
+        '2aq0aqSyOoJXtK73m-uME_jv7-pT15gOFC02RFkGMqWpzEICs69VdbwQ0LDp1v7j8xx92efCJlYFYb1sUkkBSPOlPmXgIARw8JQ0qOAOAA',
+        'wAOAOq0QJ8ARAIgXmPlOPSBkkUs1bYFYlJCfe29xx8q7v1pDL0QwbdV96sCIEzpWqMGkFR20CFOg51Tp-7vj_EMu-m37KtXJoOySqa0',
+    ),
 ]
 
 _NSIG_TESTS = [
@@ -153,7 +168,7 @@ _NSIG_TESTS = [
     ),
     (
         'https://www.youtube.com/s/player/c57c113c/player_ias.vflset/en_US/base.js',
-        '-Txvy6bT5R6LqgnQNx', 'dcklJCnRUHbgSg',
+        'M92UUMHa8PdvPd3wyM', '3hPqLJsiNZx7yA',
     ),
     (
         'https://www.youtube.com/s/player/5a3b6271/player_ias.vflset/en_US/base.js',
@@ -173,7 +188,7 @@ _NSIG_TESTS = [
     ),
     (
         'https://www.youtube.com/s/player/cfa9e7cb/player_ias.vflset/en_US/base.js',
-        'qO0NiMtYQ7TeJnfFG2', 'k9cuJDHNS5O7kQ',
+        'aCi3iElgd2kq0bxVbQ', 'QX1y8jGb2IbZ0w',
     ),
     (
         'https://www.youtube.com/s/player/8c7583ff/player_ias.vflset/en_US/base.js',
@@ -231,10 +246,6 @@ _NSIG_TESTS = [
         'https://www.youtube.com/s/player/f6e09c70/player_ias_tce.vflset/en_US/base.js',
         'W9HJZKktxuYoDTqW', 'jHbbkcaxm54',
     ),
-    (
-        'https://www.youtube.com/s/player/643afba4/player_ias.vflset/en_US/base.js',
-        'W9HJZKktxuYoDTqW', 'larxUlagTRAcSw',
-    ),
     (
         'https://www.youtube.com/s/player/e7567ecf/player_ias_tce.vflset/en_US/base.js',
         'Sy4aDGc0VpYRR9ew_', '5UPOT1VhoZxNLQ',
@@ -259,6 +270,22 @@ _NSIG_TESTS = [
         'https://www.youtube.com/s/player/643afba4/tv-player-ias.vflset/tv-player-ias.js',
         'ir9-V6cdbCiyKxhr', '2PL7ZDYAALMfmA',
     ),
+    (
+        'https://www.youtube.com/s/player/643afba4/player_ias.vflset/en_US/base.js',
+        'W9HJZKktxuYoDTqW', 'larxUlagTRAcSw',
+    ),
+    (
+        'https://www.youtube.com/s/player/363db69b/player_ias.vflset/en_US/base.js',
+        'eWYu5d5YeY_4LyEDc', 'XJQqf-N7Xra3gg',
+    ),
+    (
+        'https://www.youtube.com/s/player/4fcd6e4a/player_ias.vflset/en_US/base.js',
+        'o_L251jm8yhZkWtBW', 'lXoxI3XvToqn6A',
+    ),
+    (
+        'https://www.youtube.com/s/player/4fcd6e4a/tv-player-ias.vflset/tv-player-ias.js',
+        'o_L251jm8yhZkWtBW', 'lXoxI3XvToqn6A',
+    ),
 ]
 
 
@@ -271,6 +298,8 @@ class TestPlayerInfo(unittest.TestCase):
             ('https://www.youtube.com/s/player/64dddad9/player-plasma-ias-phone-en_US.vflset/base.js', '64dddad9'),
             ('https://www.youtube.com/s/player/64dddad9/player-plasma-ias-phone-de_DE.vflset/base.js', '64dddad9'),
             ('https://www.youtube.com/s/player/64dddad9/player-plasma-ias-tablet-en_US.vflset/base.js', '64dddad9'),
+            ('https://www.youtube.com/s/player/e7567ecf/player_ias_tce.vflset/en_US/base.js', 'e7567ecf'),
+            ('https://www.youtube.com/s/player/643afba4/tv-player-ias.vflset/tv-player-ias.js', '643afba4'),
             # obsolete
             ('https://www.youtube.com/yts/jsbin/player_ias-vfle4-e03/en_US/base.js', 'vfle4-e03'),
             ('https://www.youtube.com/yts/jsbin/player_ias-vfl49f_g4/en_US/base.js', 'vfl49f_g4'),
@@ -280,8 +309,9 @@ class TestPlayerInfo(unittest.TestCase):
             ('https://s.ytimg.com/yts/jsbin/html5player-en_US-vflXGBaUN.js', 'vflXGBaUN'),
             ('https://s.ytimg.com/yts/jsbin/html5player-en_US-vflKjOTVq/html5player.js', 'vflKjOTVq'),
         )
+        ie = YoutubeIE(FakeYDL({'cachedir': False}))
         for player_url, expected_player_id in PLAYER_URLS:
-            player_id = YoutubeIE._extract_player_info(player_url)
+            player_id = ie._extract_player_info(player_url)
             self.assertEqual(player_id, expected_player_id)
 
 
@@ -301,8 +331,8 @@ class TestSignature(unittest.TestCase):
 def t_factory(name, sig_func, url_pattern):
     def make_tfunc(url, sig_input, expected_sig):
         m = url_pattern.match(url)
-        assert m, '%r should follow URL format' % url
-        test_id = m.group('id')
+        assert m, '{0!r} should follow URL format'.format(url)
+        test_id = re.sub(r'[/.-]', '_', m.group('id') or m.group('compat_id'))
 
         def test_func(self):
             basename = 'player-{0}-{1}.js'.format(name, test_id)
@@ -335,12 +365,16 @@ def n_sig(jscode, sig_input):
 
 
 make_sig_test = t_factory(
-    'signature', signature, re.compile(r'.*(?:-|/player/)(?P<id>[a-zA-Z0-9_-]+)(?:/.+\.js|(?:/watch_as3|/html5player)?\.[a-z]+)$'))
+    'signature', signature,
+    re.compile(r'''(?x)
+        .+/(?P<h5>html5)?player(?(h5)(?:-en_US)?-|/)(?P<id>[a-zA-Z0-9/._-]+)
+        (?(h5)/(?:watch_as3|html5player))?\.js$
+    '''))
 for test_spec in _SIG_TESTS:
     make_sig_test(*test_spec)
 
 make_nsig_test = t_factory(
-    'nsig', n_sig, re.compile(r'.+/player/(?P<id>[a-zA-Z0-9_-]+)/.+.js$'))
+    'nsig', n_sig, re.compile(r'.+/player/(?P<id>[a-zA-Z0-9_/.-]+)\.js$'))
 for test_spec in _NSIG_TESTS:
     make_nsig_test(*test_spec)
 

youtube_dl/extractor/extractors.py

@@ -678,6 +678,10 @@ from .mediasite import (
     MediasiteCatalogIE,
     MediasiteNamedCatalogIE,
 )
+from .mediathekviewweb import (
+    MediathekViewWebSearchIE,
+    MediathekViewWebIE,
+)
 from .medici import MediciIE
 from .megaphone import MegaphoneIE
 from .meipai import MeipaiIE

youtube_dl/extractor/mediathekviewweb.py

@@ -0,0 +1,280 @@
+# coding=utf-8
+from __future__ import unicode_literals
+
+import datetime
+import itertools
+import json
+
+from .common import InfoExtractor, SearchInfoExtractor
+from ..compat import compat_parse_qs, compat_urlparse
+from ..utils import ExtractorError, int_or_none
+
+
+class MediathekViewWebSearchIE(SearchInfoExtractor):
+    IE_NAME = 'mediathekviewweb:search'
+    IE_DESC = 'MediathekViewWeb search'
+    _SEARCH_KEY = 'mvwsearch'
+    _MAX_RESULTS = float('inf')
+    _MAX_RESULTS_PER_PAGE = 50
+
+    _TESTS = [
+        {
+            'url': 'mvwsearchall:sandmännchen !kika',
+            'info_dict': {
+                'title': 'Unser Sandmännchen',
+            },
+            'playlist': [],
+            'playlist_count': 7,
+        },
+        {
+            # Audio description & common topic.
+            'url': 'mvwsearch:#Sendung,Maus Audiodeskription',
+            'info_dict': {
+                'title': 'Die Sendung mit der Maus',
+            },
+            'playlist': [],
+            'playlist_count': 1,
+            'params': {
+                'format': 'medium-audio_description',
+                'skip_download': True,
+            }
+        },
+        {
+            # Sign language.
+            'url': 'mvwsearchall:!ard #Tagesschau Gebärdensprache',
+            'info_dict': {
+                'title': '!ard #Tagesschau Gebärdensprache',
+            },
+            'playlist': [],
+            'playlist_mincount': 365,
+            'params': {
+                'format': 'medium-sign_language',
+                'skip_download': True,
+            },
+        },
+    ]
+
+    # Map of title affixes indicating video variants.
+    _variants = {
+        'audio_description': 'Audiodeskription',
+        'sign_language': 'mit Gebärdensprache',
+    }
+    _future = True
+    _everywhere = False
+
+    def _build_conditions(self, search):
+        # @note So far, there is no API endpoint to convert a query string into
+        #   a complete query object, as required by the /api/query endpoint.
+        filters = {}
+        extra = {}
+
+        for component in search.lower().split():
+            if len(component) == 0:
+                continue
+
+            operator = component[0:1]
+            value = component[1:]
+            if len(value) == 0:
+                # Treat single character query as such.
+                # @note This differs from MVW's implementation.
+                operator = ''
+                value = component
+
+            # Extra, non-field settings.
+            if operator == '>':
+                value = int(value.split(',')[0]) * 60
+                extra['duration_min'] = max(extra.get('duration_min', 0), value)
+                continue
+            elif operator == '<':
+                value = int(value.split(',')[0]) * 60
+                extra['duration_max'] = min(extra.get('duration_max', float('inf')), value)
+                continue
+
+            # Field query operators.
+            if operator == '!':
+                field = 'channel'
+            elif operator == '#':
+                field = 'topic'
+            elif operator == '+':
+                field = 'title'
+            elif operator == '*':
+                field = 'description'
+            else:
+                # No known operator specified.
+                field = 'generic'
+                value = component
+
+            # @note In theory, comma-joined values are for AND queries. However
+            #   so far, each condition is AND joined, even without comma.
+            filters.setdefault(field, []).append(' '.join(value.split(',')))
+
+        # Generic filters can apply to different fields, based on the query.
+        if 'generic' in filters:
+            if self._everywhere:
+                filters['channel,topic,title,description'] = filters['generic']
+            elif 'topic' in filters:
+                filters['title'] = filters['generic']
+            else:
+                filters['topic,title'] = filters['generic']
+            filters.pop('generic')
+
+        conditions = []
+        for field, keys in filters.items():
+            for query in keys:
+                conditions.append({
+                    'fields': field.split(','),
+                    'query': query,
+                })
+
+        return conditions, extra
+
+    def _extract_playlist_entries(self, results):
+        entries = []
+        for item in results:
+            variant = None
+            for key, value in self._variants.items():
+                if item.setdefault('title', '').find(value) != -1:
+                    variant = key
+
+            formats = []
+            formats.append({
+                'url': item['url_video'],
+                'format': ('medium (' + self._variants[variant] + ')') if variant else None,
+                'format_id': ('medium-' + variant) if variant else 'medium',
+                'language_preference': -10 if variant else 10,
+                'quality': -2,
+                'filesize': item.get('size'),
+            })
+            if len(item.get('url_video_low', '')) > 0:
+                formats.append({
+                    'url': item['url_video_low'],
+                    'format': ('low (' + self._variants[variant] + ')') if variant else None,
+                    'format_id': ('low-' + variant) if variant else 'low',
+                    'language_preference': -10 if variant else 10,
+                    'quality': -3,
+                })
+            if len(item.get('url_video_hd', '')) > 0:
+                formats.append({
+                    'url': item['url_video_hd'],
+                    'format': ('high (' + self._variants[variant] + ')') if variant else None,
+                    'format_id': ('high-' + variant) if variant else 'high',
+                    'language_preference': -10 if variant else 10,
+                    'quality': -1,
+                })
+            self._sort_formats(formats)
+
+            video = {
+                '_type': 'video',
+                'formats': formats,
+                'id': item.get('id'),
+                'title': item.get('title'),
+                'description': item.get('description'),
+                'series': item.get('topic'),
+                'channel': item.get('channel'),
+                'uploader': item.get('channel'),
+                'duration': int_or_none(item.get('duration')),
+                'webpage_url': item.get('url_website'),
+            }
+
+            if item.get('timestamp'):
+                upload_date = datetime.datetime.utcfromtimestamp(item['timestamp'])
+                video['upload_date'] = upload_date.strftime('%Y%m%d')
+            if item.get('url_subtitle'):
+                video.setdefault('subtitles', {}).setdefault('de', []).append({
+                    'url': item.get('url_subtitle'),
+                    'ext': 'ttml',
+                })
+            entries.append(video)
+
+        return entries
+
+    def _get_n_results(self, query, n):
+        queries, extra = self._build_conditions(query)
+        queryObject = {
+            'queries': queries,
+            'sortBy': 'timestamp',
+            'sortOrder': 'desc',
+            'future': self._future,
+            'duration_min': extra.get('duration_min'),
+            'duration_max': extra.get('duration_max'),
+            'offset': 0,
+            'size': min(n, self._MAX_RESULTS_PER_PAGE),
+        }
+
+        entries = []
+        for page_num in itertools.count(1):
+            queryObject.update({'offset': (page_num - 1) * queryObject['size']})
+            results = self._download_json('https://mediathekviewweb.de/api/query', query,
+                                          note='Fetching page %d' % page_num,
+                                          data=json.dumps(queryObject).encode('utf-8'),
+                                          headers={'Content-Type': 'text/plain'})
+            if results['err'] is not None:
+                raise ExtractorError('API returned an error: %s' % results['err'][0])
+            entries.extend(self._extract_playlist_entries(results['result']['results']))
+
+            meta = results['result']['queryInfo']
+            if len(entries) >= n:
+                entries = entries[:n]
+                break
+            elif meta['resultCount'] == 0:
+                break
+
+        common_topic = None
+        if entries:
+            common_topic = entries[0]['series']
+            for entry in entries:
+                common_topic = common_topic if entry['series'] == common_topic else None
+
+        return self.playlist_result(entries, playlist_title=common_topic or query)
+
+
+class MediathekViewWebIE(InfoExtractor):
+    # @see https://github.com/mediathekview/mediathekviewweb
+    IE_NAME = 'mediathekviewweb'
+    _VALID_URL = r'https?://mediathekviewweb\.de/\#query=(?P<id>.+)'
+
+    _TESTS = [
+        {
+            # Test for everywhere.
+            'url': 'https://mediathekviewweb.de/#query=!ard%20%23Tagesschau%2020%2CUhr&everywhere=true',
+            'info_dict': {
+                'title': '!ard #Tagesschau 20,Uhr',
+            },
+            # Without everywhere, there are <100 results.
+            'playlist_mincount': 365,
+            'params': {
+                'skip_download': True,
+            },
+        },
+        {
+            # Test for non-future videos.
+            'url': 'https://mediathekviewweb.de/#query=%23sport%2Cim%2Costen%20biathlon&future=false',
+            'info_dict': {
+                'title': 'Sport im Osten',
+            },
+            # Future yields 4 results instead.
+            'playlist_maxcount': 2,
+            'params': {
+                'skip_download': True,
+            },
+        },
+    ]
+
+    def _real_extract(self, url):
+        query_hash = self._match_id(url)
+
+        url_stub = '?query=' + query_hash
+        query = compat_parse_qs(compat_urlparse.urlparse(url_stub).query)
+        search = query['query'][0]
+        query.pop('query')
+
+        if len(query) > 0:
+            # Detect global flags, MVW is very strict about accepted values.
+            extractor = MediathekViewWebSearchIE(self._downloader)
+            if query.get('everywhere', []) == ['true']:
+                extractor._everywhere = True
+            if query.get('future', []) == ['false']:
+                extractor._future = False
+            return extractor._real_extract('mvwsearchall:' + search)
+
+        return self.url_result('mvwsearchall:' + search, ie=MediathekViewWebSearchIE.ie_key())

youtube_dl/extractor/youtube.py

@@ -692,9 +692,9 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         'invidious': '|'.join(_INVIDIOUS_SITES),
     }
     _PLAYER_INFO_RE = (
-        r'/s/player/(?P<id>[a-zA-Z0-9_-]{8,})//(?:tv-)?player',
-        r'/(?P<id>[a-zA-Z0-9_-]{8,})/player(?:_ias\.vflset(?:/[a-zA-Z]{2,3}_[a-zA-Z]{2,3})?|-plasma-ias-(?:phone|tablet)-[a-z]{2}_[A-Z]{2}\.vflset)/base\.js$',
-        r'\b(?P<id>vfl[a-zA-Z0-9_-]+)\b.*?\.js$',
+        r'/s/player/(?P<id>[a-zA-Z0-9_-]{8,})/(?:tv-)?player',
+        r'/(?P<id>[a-zA-Z0-9_-]{8,})/player(?:_ias(?:_tce)?\.vflset(?:/[a-zA-Z]{2,3}_[a-zA-Z]{2,3})?|-plasma-ias-(?:phone|tablet)-[a-z]{2}_[A-Z]{2}\.vflset)/base\.js$',
+        r'\b(?P<id>vfl[a-zA-Z0-9_-]{6,})\b.*?\.js$',
     )
     _SUBTITLE_FORMATS = ('json3', 'srv1', 'srv2', 'srv3', 'ttml', 'vtt')
 
@@ -1626,15 +1626,13 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         """ Return a string representation of a signature """
         return '.'.join(compat_str(len(part)) for part in example_sig.split('.'))
 
-    @classmethod
-    def _extract_player_info(cls, player_url):
-        for player_re in cls._PLAYER_INFO_RE:
-            id_m = re.search(player_re, player_url)
-            if id_m:
-                break
-        else:
-            raise ExtractorError('Cannot identify player %r' % player_url)
-        return id_m.group('id')
+    def _extract_player_info(self, player_url):
+        try:
+            return self._search_regex(
+                self._PLAYER_INFO_RE, player_url, 'player info', group='id')
+        except ExtractorError as e:
+            raise ExtractorError(
+                'Cannot identify player %r' % (player_url,), cause=e)
 
     def _load_player(self, video_id, player_url, fatal=True, player_id=None):
         if not player_id:
@@ -1711,6 +1709,23 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                 '    return %s\n') % (signature_id_tuple, expr_code)
         self.to_screen('Extracted signature function:\n' + code)
 
+    def _extract_sig_fn(self, jsi, funcname):
+        var_ay = self._search_regex(
+            r'''(?x)
+                (?:\*/|\{|\n|^)\s*(?:'[^']+'\s*;\s*)
+                    (var\s*[\w$]+\s*=\s*(?:
+                        ('|")(?:\\\2|(?!\2).)+\2\s*\.\s*split\(\s*('|")\W+\3\s*\)|
+                        \[\s*(?:('|")(?:\\\4|(?!\4).)*\4\s*(?:(?=\])|,\s*))+\]
+                    ))(?=\s*[,;])
+            ''', jsi.code, 'useful values', default='')
+
+        sig_fn = jsi.extract_function_code(funcname)
+
+        if var_ay:
+            sig_fn = (sig_fn[0], ';\n'.join((var_ay, sig_fn[1])))
+
+        return sig_fn
+
     def _parse_sig_js(self, jscode):
         # Examples where `sig` is funcname:
         # sig=function(a){a=a.split(""); ... ;return a.join("")};
@@ -1736,8 +1751,12 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             jscode, 'Initial JS player signature function name', group='sig')
 
         jsi = JSInterpreter(jscode)
-        initial_function = jsi.extract_function(funcname)
-        return lambda s: initial_function([s])
+
+        initial_function = self._extract_sig_fn(jsi, funcname)
+
+        func = jsi.extract_function_from_code(*initial_function)
+
+        return lambda s: func([s])
 
     def _cached(self, func, *cache_id):
         def inner(*args, **kwargs):
@@ -1856,15 +1875,9 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
     def _extract_n_function_code_jsi(self, video_id, jsi, player_id=None):
 
-        var_ay = self._search_regex(
-            r'(?:[;\s]|^)\s*(var\s*[\w$]+\s*=\s*"(?:\\"|[^"])+"\s*\.\s*split\("\W+"\))(?=\s*[,;])',
-            jsi.code, 'useful values', default='')
-
         func_name = self._extract_n_function_name(jsi.code)
 
-        func_code = jsi.extract_function_code(func_name)
-        if var_ay:
-            func_code = (func_code[0], ';\n'.join((var_ay, func_code[1])))
+        func_code = self._extract_sig_fn(jsi, func_name)
 
         if player_id:
             self.cache.store('youtube-nsig', player_id, func_code)
@@ -2136,7 +2149,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                     video_details = merge_dicts(*traverse_obj(
                         (player_response, api_player_response),
                         (Ellipsis, 'videoDetails', T(dict))))
-                    player_response.update(api_player_response or {})
+                    player_response.update(filter_dict(
+                        api_player_response or {}, cndn=lambda k, _: k != 'captions'))
                     player_response['videoDetails'] = video_details
 
         def is_agegated(playability):
@@ -2566,8 +2580,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         }
 
         pctr = traverse_obj(
-            player_response,
-            ('captions', 'playerCaptionsTracklistRenderer', T(dict)))
+            (player_response, api_player_response),
+            (Ellipsis, 'captions', 'playerCaptionsTracklistRenderer', T(dict)))
         if pctr:
             def process_language(container, base_url, lang_code, query):
                 lang_subs = []
@@ -2584,20 +2598,21 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             def process_subtitles():
                 subtitles = {}
                 for caption_track in traverse_obj(pctr, (
-                        'captionTracks', lambda _, v: v.get('baseUrl'))):
+                        Ellipsis, 'captionTracks', lambda _, v: (
+                            v.get('baseUrl') and v.get('languageCode')))):
                     base_url = self._yt_urljoin(caption_track['baseUrl'])
                     if not base_url:
                         continue
+                    lang_code = caption_track['languageCode']
                     if caption_track.get('kind') != 'asr':
-                        lang_code = caption_track.get('languageCode')
-                        if not lang_code:
-                            continue
                         process_language(
                             subtitles, base_url, lang_code, {})
                         continue
                     automatic_captions = {}
+                    process_language(
+                        automatic_captions, base_url, lang_code, {})
                     for translation_language in traverse_obj(pctr, (
-                            'translationLanguages', lambda _, v: v.get('languageCode'))):
+                            Ellipsis, 'translationLanguages', lambda _, v: v.get('languageCode'))):
                         translation_language_code = translation_language['languageCode']
                         process_language(
                             automatic_captions, base_url, translation_language_code,

youtube_dl/jsinterp.py

@@ -678,7 +678,7 @@ class JSInterpreter(object):
             return len(obj)
         try:
             return obj[int(idx)] if isinstance(obj, list) else obj[compat_str(idx)]
-        except (TypeError, KeyError, IndexError) as e:
+        except (TypeError, KeyError, IndexError, ValueError) as e:
             # allow_undefined is None gives correct behaviour
             if allow_undefined or (
                     allow_undefined is None and not isinstance(e, TypeError)):
@@ -1038,6 +1038,10 @@ class JSInterpreter(object):
                     left_val = self._index(left_val, idx)
             if isinstance(idx, float):
                 idx = int(idx)
+            if isinstance(left_val, list) and len(left_val) <= int_or_none(idx, default=-1):
+                # JS Array is a sparsely assignable list
+                # TODO: handle extreme sparsity without memory bloat, eg using auxiliary dict
+                left_val.extend((idx - len(left_val) + 1) * [JS_Undefined])
             left_val[idx] = self._operator(
                 m.group('op'), self._index(left_val, idx) if m.group('op') else None,
                 m.group('expr'), expr, local_vars, allow_recursion)
@@ -1204,9 +1208,10 @@ class JSInterpreter(object):
                 elif member == 'join':
                     assertion(isinstance(obj, list), 'must be applied on a list')
                     assertion(len(argvals) <= 1, 'takes at most one argument')
-                    return (',' if len(argvals) == 0 else argvals[0]).join(
-                        ('' if x in (None, JS_Undefined) else _js_toString(x))
-                        for x in obj)
+                    return (',' if len(argvals) == 0 or argvals[0] in (None, JS_Undefined)
+                            else argvals[0]).join(
+                                ('' if x in (None, JS_Undefined) else _js_toString(x))
+                                for x in obj)
                 elif member == 'reverse':
                     assertion(not argvals, 'does not take any arguments')
                     obj.reverse()
@@ -1364,19 +1369,21 @@ class JSInterpreter(object):
         code, _ = self._separate_at_paren(func_m.group('code'))  # refine the match
         return self.build_arglist(func_m.group('args')), code
 
-    def extract_function(self, funcname):
+    def extract_function(self, funcname, *global_stack):
         return function_with_repr(
-            self.extract_function_from_code(*self.extract_function_code(funcname)),
+            self.extract_function_from_code(*itertools.chain(
+                self.extract_function_code(funcname), global_stack)),
             'F<%s>' % (funcname,))
 
     def extract_function_from_code(self, argnames, code, *global_stack):
         local_vars = {}
 
+        start = None
         while True:
-            mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code)
+            mobj = re.search(r'function\((?P<args>[^)]*)\)\s*{', code[start:])
             if mobj is None:
                 break
-            start, body_start = mobj.span()
+            start, body_start = ((start or 0) + x for x in mobj.span())
             body, remaining = self._separate_at_paren(code[body_start - 1:])
             name = self._named_object(local_vars, self.extract_function_from_code(
                 [x.strip() for x in mobj.group('args').split(',')],