Extraction: Split yt_data_extract.py into multiple files

5 files changed, 1188 insertions, 1190 deletions

diff --git a/youtube/yt_data_extract.py b/youtube/yt_data_extract.py
deleted file mode 100644
index 68550cf..0000000
--- a/youtube/yt_data_extract.py
+++ /dev/null
@@ -1,1190 +0,0 @@
-from youtube import util, proto
-
-import html
-import json
-import re
-import urllib.parse
-import collections
-from math import ceil
-import traceback
-
-# videos:
-
-# id
-# title
-# url
-# author
-# author_url
-# thumbnail
-# description
-# time_published (str)
-# duration (str)
-# like_count (int)
-# dislike_count (int)
-# view_count (int)
-# approx_view_count (str)
-# playlist_index
-
-# playlists:
-
-# id
-# title
-# url
-# author
-# author_url
-# thumbnail
-# description
-# time_published (str)
-# video_count (int)
-# first_video_id
-
-# from https://github.com/ytdl-org/youtube-dl/blob/master/youtube_dl/extractor/youtube.py
-_formats = {
-    '5': {'ext': 'flv', 'width': 400, 'height': 240, 'acodec': 'mp3', 'audio_bitrate': 64, 'vcodec': 'h263'},
-    '6': {'ext': 'flv', 'width': 450, 'height': 270, 'acodec': 'mp3', 'audio_bitrate': 64, 'vcodec': 'h263'},
-    '13': {'ext': '3gp', 'acodec': 'aac', 'vcodec': 'mp4v'},
-    '17': {'ext': '3gp', 'width': 176, 'height': 144, 'acodec': 'aac', 'audio_bitrate': 24, 'vcodec': 'mp4v'},
-    '18': {'ext': 'mp4', 'width': 640, 'height': 360, 'acodec': 'aac', 'audio_bitrate': 96, 'vcodec': 'h264'},
-    '22': {'ext': 'mp4', 'width': 1280, 'height': 720, 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
-    '34': {'ext': 'flv', 'width': 640, 'height': 360, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-    '35': {'ext': 'flv', 'width': 854, 'height': 480, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-    # itag 36 videos are either 320x180 (BaW_jenozKc) or 320x240 (__2ABJjxzNo), audio_bitrate varies as well
-    '36': {'ext': '3gp', 'width': 320, 'acodec': 'aac', 'vcodec': 'mp4v'},
-    '37': {'ext': 'mp4', 'width': 1920, 'height': 1080, 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
-    '38': {'ext': 'mp4', 'width': 4096, 'height': 3072, 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
-    '43': {'ext': 'webm', 'width': 640, 'height': 360, 'acodec': 'vorbis', 'audio_bitrate': 128, 'vcodec': 'vp8'},
-    '44': {'ext': 'webm', 'width': 854, 'height': 480, 'acodec': 'vorbis', 'audio_bitrate': 128, 'vcodec': 'vp8'},
-    '45': {'ext': 'webm', 'width': 1280, 'height': 720, 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
-    '46': {'ext': 'webm', 'width': 1920, 'height': 1080, 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
-    '59': {'ext': 'mp4', 'width': 854, 'height': 480, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-    '78': {'ext': 'mp4', 'width': 854, 'height': 480, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-
-
-    # 3D videos
-    '82': {'ext': 'mp4', 'height': 360, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-    '83': {'ext': 'mp4', 'height': 480, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-    '84': {'ext': 'mp4', 'height': 720, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
-    '85': {'ext': 'mp4', 'height': 1080, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
-    '100': {'ext': 'webm', 'height': 360, 'format_note': '3D', 'acodec': 'vorbis', 'audio_bitrate': 128, 'vcodec': 'vp8'},
-    '101': {'ext': 'webm', 'height': 480, 'format_note': '3D', 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
-    '102': {'ext': 'webm', 'height': 720, 'format_note': '3D', 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
-
-    # Apple HTTP Live Streaming
-    '91': {'ext': 'mp4', 'height': 144, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 48, 'vcodec': 'h264'},
-    '92': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 48, 'vcodec': 'h264'},
-    '93': {'ext': 'mp4', 'height': 360, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-    '94': {'ext': 'mp4', 'height': 480, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
-    '95': {'ext': 'mp4', 'height': 720, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 256, 'vcodec': 'h264'},
-    '96': {'ext': 'mp4', 'height': 1080, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 256, 'vcodec': 'h264'},
-    '132': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 48, 'vcodec': 'h264'},
-    '151': {'ext': 'mp4', 'height': 72, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 24, 'vcodec': 'h264'},
-
-    # DASH mp4 video
-    '133': {'ext': 'mp4', 'height': 240, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '134': {'ext': 'mp4', 'height': 360, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '135': {'ext': 'mp4', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '136': {'ext': 'mp4', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '137': {'ext': 'mp4', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '138': {'ext': 'mp4', 'format_note': 'DASH video', 'vcodec': 'h264'},  # Height can vary (https://github.com/ytdl-org/youtube-dl/issues/4559)
-    '160': {'ext': 'mp4', 'height': 144, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '212': {'ext': 'mp4', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '264': {'ext': 'mp4', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'h264'},
-    '298': {'ext': 'mp4', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'h264', 'fps': 60},
-    '299': {'ext': 'mp4', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'h264', 'fps': 60},
-    '266': {'ext': 'mp4', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'h264'},
-
-    # Dash mp4 audio
-    '139': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'audio_bitrate': 48, 'container': 'm4a_dash'},
-    '140': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'audio_bitrate': 128, 'container': 'm4a_dash'},
-    '141': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'audio_bitrate': 256, 'container': 'm4a_dash'},
-    '256': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'container': 'm4a_dash'},
-    '258': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'container': 'm4a_dash'},
-    '325': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'dtse', 'container': 'm4a_dash'},
-    '328': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'ec-3', 'container': 'm4a_dash'},
-
-    # Dash webm
-    '167': {'ext': 'webm', 'height': 360, 'width': 640, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
-    '168': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
-    '169': {'ext': 'webm', 'height': 720, 'width': 1280, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
-    '170': {'ext': 'webm', 'height': 1080, 'width': 1920, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
-    '218': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
-    '219': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
-    '278': {'ext': 'webm', 'height': 144, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp9'},
-    '242': {'ext': 'webm', 'height': 240, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '243': {'ext': 'webm', 'height': 360, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '244': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '245': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '246': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '247': {'ext': 'webm', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '248': {'ext': 'webm', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '271': {'ext': 'webm', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    # itag 272 videos are either 3840x2160 (e.g. RtoitU2A-3E) or 7680x4320 (sLprVF6d7Ug)
-    '272': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '302': {'ext': 'webm', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
-    '303': {'ext': 'webm', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
-    '308': {'ext': 'webm', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
-    '313': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9'},
-    '315': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
-
-    # Dash webm audio
-    '171': {'ext': 'webm', 'acodec': 'vorbis', 'format_note': 'DASH audio', 'audio_bitrate': 128},
-    '172': {'ext': 'webm', 'acodec': 'vorbis', 'format_note': 'DASH audio', 'audio_bitrate': 256},
-
-    # Dash webm audio with opus inside
-    '249': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'audio_bitrate': 50},
-    '250': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'audio_bitrate': 70},
-    '251': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'audio_bitrate': 160},
-
-    # RTMP (unnamed)
-    '_rtmp': {'protocol': 'rtmp'},
-
-    # av01 video only formats sometimes served with "unknown" codecs
-    '394': {'vcodec': 'av01.0.05M.08'},
-    '395': {'vcodec': 'av01.0.05M.08'},
-    '396': {'vcodec': 'av01.0.05M.08'},
-    '397': {'vcodec': 'av01.0.05M.08'},
-}
-
-def get(object, key, default=None, types=()):
-    '''Like dict.get(), but returns default if the result doesn't match one of the types.
-       Also works for indexing lists.'''
-    try:
-        result = object[key]
-    except (TypeError, IndexError, KeyError):
-        return default
-
-    if not types or isinstance(result, types):
-        return result
-    else:
-        return default
-
-def multi_get(object, *keys, default=None, types=()):
-    '''Like get, but try other keys if the first fails'''
-    for key in keys:
-        try:
-            result = object[key]
-        except (TypeError, IndexError, KeyError):
-            pass
-        else:
-            if not types or isinstance(result, types):
-                return result
-            else:
-                continue
-    return default
-
-
-def deep_get(object, *keys, default=None, types=()):
-    '''Like dict.get(), but for nested dictionaries/sequences, supporting keys or indices.
-       Last argument is the default value to use in case of any IndexErrors or KeyErrors.
-       If types is given and the result doesn't match one of those types, default is returned'''
-    try:
-        for key in keys:
-            object = object[key]
-    except (TypeError, IndexError, KeyError):
-        return default
-    else:
-        if not types or isinstance(object, types):
-            return object
-        else:
-            return default
-
-def multi_deep_get(object, *key_sequences, default=None, types=()):
-    '''Like deep_get, but can try different key sequences in case one fails.
-       Return default if all of them fail. key_sequences is a list of lists'''
-    for key_sequence in key_sequences:
-        _object = object
-        try:
-            for key in key_sequence:
-                _object = _object[key]
-        except (TypeError, IndexError, KeyError):
-            pass
-        else:
-            if not types or isinstance(_object, types):
-                return _object
-            else:
-                continue
-    return default
-
-def liberal_update(obj, key, value):
-    '''Updates obj[key] with value as long as value is not None.
-    Ensures obj[key] will at least get a value of None, however'''
-    if (value is not None) or (key not in obj):
-        obj[key] = value
-
-def conservative_update(obj, key, value):
-    '''Only updates obj if it doesn't have key or obj[key] is None'''
-    if obj.get(key) is None:
-        obj[key] = value
-
-def remove_redirect(url):
-    if re.fullmatch(r'(((https?:)?//)?(www.)?youtube.com)?/redirect\?.*', url) is not None: # youtube puts these on external links to do tracking
-        query_string = url[url.find('?')+1: ]
-        return urllib.parse.parse_qs(query_string)['q'][0]
-    return url
-
-def _recover_urls(runs):
-    for run in runs:
-        url = deep_get(run, 'navigationEndpoint', 'urlEndpoint', 'url')
-        text = run.get('text', '')
-        # second condition is necessary because youtube makes other things into urls, such as hashtags, which we want to keep as text
-        if url is not None and (text.startswith('http://') or text.startswith('https://')):
-            url = remove_redirect(url)
-            run['url'] = url
-            run['text'] = url # youtube truncates the url text, use actual url instead
-
-def extract_str(node, default=None, recover_urls=False):
-    '''default is the value returned if the extraction fails. If recover_urls is true, will attempt to fix Youtube's truncation of url text (most prominently seen in descriptions)'''
-    if isinstance(node, str):
-        return node
-
-    try:
-        return node['simpleText']
-    except (KeyError, TypeError):
-        pass
-
-    if isinstance(node, dict) and 'runs' in node:
-        if recover_urls:
-            _recover_urls(node['runs'])
-        return ''.join(text_run.get('text', '') for text_run in node['runs'])
-
-    return default
-
-def extract_formatted_text(node):
-    if not node:
-        return []
-    if 'runs' in node:
-        _recover_urls(node['runs'])
-        return node['runs']
-    elif 'simpleText' in node:
-        return [{'text': node['simpleText']}]
-    return []
-
-def extract_int(string, default=None):
-    if isinstance(string, int):
-        return string
-    if not isinstance(string, str):
-        string = extract_str(string)
-    if not string:
-        return default
-    match = re.search(r'(\d+)', string.replace(',', ''))
-    if match is None:
-        return default
-    try:
-        return int(match.group(1))
-    except ValueError:
-        return default
-
-def extract_approx_int(string):
-    '''e.g. "15M" from "15M subscribers"'''
-    if not isinstance(string, str):
-        string = extract_str(string)
-    if not string:
-        return None
-    match = re.search(r'(\d+[KMBTkmbt])', string.replace(',', ''))
-    if match is None:
-        return None
-    return match.group(1)
-
-youtube_url_re = re.compile(r'^(?:(?:(?:https?:)?//)?(?:www\.)?youtube\.com)?(/.*)$')
-def normalize_url(url):
-    if url is None:
-        return None
-    match = youtube_url_re.fullmatch(url)
-    if match is None:
-        raise Exception()
-
-    return 'https://www.youtube.com' + match.group(1)
-
-def prefix_urls(item):
-    try:
-        item['thumbnail'] = util.prefix_url(item['thumbnail'])
-    except KeyError:
-        pass
-
-    try:
-        item['author_url'] = util.prefix_url(item['author_url'])
-    except KeyError:
-        pass
-
-def add_extra_html_info(item):
-    if item['type'] == 'video':
-        item['url'] = (util.URL_ORIGIN + '/watch?v=' + item['id']) if item.get('id') else None
-
-        video_info = {}
-        for key in ('id', 'title', 'author', 'duration'):
-            try:
-                video_info[key] = item[key]
-            except KeyError:
-                video_info[key] = ''
-
-        item['video_info'] = json.dumps(video_info)
-
-    elif item['type'] == 'playlist':
-        item['url'] = (util.URL_ORIGIN + '/playlist?list=' + item['id']) if item.get('id') else None
-    elif item['type'] == 'channel':
-        item['url'] = (util.URL_ORIGIN + "/channel/" + item['id']) if item.get('id') else None
-
-def extract_item_info(item, additional_info={}):
-    if not item:
-        return {'error': 'No item given'}
-
-    type = get(list(item.keys()), 0)
-    if not type:
-        return {'error': 'Could not find type'}
-    item = item[type]
-
-    info = {'error': None}
-    if type in ('itemSectionRenderer', 'compactAutoplayRenderer'):
-        return extract_item_info(deep_get(item, 'contents', 0), additional_info)
-
-    if type in ('movieRenderer', 'clarificationRenderer'):
-        info['type'] = 'unsupported'
-        return info
-
-    info.update(additional_info)
-
-    # type looks like e.g. 'compactVideoRenderer' or 'gridVideoRenderer'
-    # camelCase split, https://stackoverflow.com/a/37697078
-    type_parts = [s.lower() for s in re.sub(r'([A-Z][a-z]+)', r' \1', type).split()]
-    if len(type_parts) < 2:
-        info['type'] = 'unsupported'
-        return
-    primary_type = type_parts[-2]
-    if primary_type == 'video':
-        info['type'] = 'video'
-    elif primary_type in ('playlist', 'radio', 'show'):
-        info['type'] = 'playlist'
-    elif primary_type == 'channel':
-        info['type'] = 'channel'
-    else:
-        info['type'] = 'unsupported'
-
-    info['title'] = extract_str(item.get('title'))
-    info['author'] = extract_str(multi_get(item, 'longBylineText', 'shortBylineText', 'ownerText'))
-    info['author_id'] = extract_str(multi_deep_get(item,
-        ['longBylineText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId'],
-        ['shortBylineText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId'],
-        ['ownerText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId']
-    ))
-    info['author_url'] = ('https://www.youtube.com/channel/' + info['author_id']) if info['author_id'] else None
-    info['description'] = extract_formatted_text(multi_get(item, 'descriptionSnippet', 'descriptionText'))
-    info['thumbnail'] = multi_deep_get(item,
-        ['thumbnail', 'thumbnails', 0, 'url'],      # videos
-        ['thumbnails', 0, 'thumbnails', 0, 'url'],  # playlists
-        ['thumbnailRenderer', 'showCustomThumbnailRenderer', 'thumbnail', 'thumbnails', 0, 'url'], # shows
-    )
-
-    info['badges'] = []
-    for badge_node in multi_get(item, 'badges', 'ownerBadges', default=()):
-        badge = deep_get(badge_node, 'metadataBadgeRenderer', 'label')
-        if badge:
-            info['badges'].append(badge)
-
-    if primary_type in ('video', 'playlist'):
-        info['time_published'] = extract_str(item.get('publishedTimeText'))
-
-    if primary_type == 'video':
-        info['id'] = item.get('videoId')
-        info['view_count'] = extract_int(item.get('viewCountText'))
-
-        # dig into accessibility data to get view_count for videos marked as recommended, and to get time_published
-        accessibility_label = deep_get(item, 'title', 'accessibility', 'accessibilityData', 'label', default='')
-        timestamp = re.search(r'(\d+ \w+ ago)', accessibility_label)
-        if timestamp:
-            conservative_update(info, 'time_published', timestamp.group(1))
-        view_count = re.search(r'(\d+) views', accessibility_label.replace(',', ''))
-        if view_count:
-            conservative_update(info, 'view_count', int(view_count.group(1)))
-
-        if info['view_count']:
-            info['approx_view_count'] = '{:,}'.format(info['view_count'])
-        else:
-            info['approx_view_count'] = extract_approx_int(multi_get(item, 'shortViewCountText'))
-        info['duration'] = extract_str(item.get('lengthText'))
-    elif primary_type == 'playlist':
-        info['id'] = item.get('playlistId')
-        info['video_count'] = extract_int(item.get('videoCount'))
-    elif primary_type == 'channel':
-        info['id'] = item.get('channelId')
-        info['approx_subscriber_count'] = extract_approx_int(item.get('subscriberCountText'))
-    elif primary_type == 'show':
-        info['id'] = deep_get(item, 'navigationEndpoint', 'watchEndpoint', 'playlistId')
-
-    if primary_type in ('playlist', 'channel'):
-        conservative_update(info, 'video_count', extract_int(item.get('videoCountText')))
-
-    for overlay in item.get('thumbnailOverlays', []):
-        conservative_update(info, 'duration', extract_str(deep_get(
-            overlay, 'thumbnailOverlayTimeStatusRenderer', 'text'
-        )))
-        # show renderers don't have videoCountText
-        conservative_update(info, 'video_count', extract_int(deep_get(
-            overlay, 'thumbnailOverlayBottomPanelRenderer', 'text'
-        )))
-    return info
-
-def parse_info_prepare_for_html(renderer, additional_info={}):
-    item = extract_item_info(renderer, additional_info)
-    prefix_urls(item)
-    add_extra_html_info(item)
-
-    return item
-
-def extract_response(polymer_json):
-    '''return response, error'''
-    response = multi_deep_get(polymer_json, [1, 'response'], ['response'], default=None, types=dict)
-    if response is None:
-        return None, 'Failed to extract response'
-    else:
-        return response, None
-
-
-list_types = {
-    'sectionListRenderer',
-    'itemSectionRenderer',
-    'gridRenderer',
-    'playlistVideoListRenderer',
-}
-
-item_types = {
-    'movieRenderer',
-    'didYouMeanRenderer',
-    'showingResultsForRenderer',
-
-    'videoRenderer',
-    'compactVideoRenderer',
-    'compactAutoplayRenderer',
-    'gridVideoRenderer',
-    'playlistVideoRenderer',
-
-    'playlistRenderer',
-    'compactPlaylistRenderer',
-    'gridPlaylistRenderer',
-
-    'radioRenderer',
-    'compactRadioRenderer',
-    'gridRadioRenderer',
-
-    'showRenderer',
-    'compactShowRenderer',
-    'gridShowRenderer',
-
-
-    'channelRenderer',
-    'compactChannelRenderer',
-    'gridChannelRenderer',
-
-    'channelAboutFullMetadataRenderer',
-}
-
-def traverse_browse_renderer(renderer):
-    for tab in get(renderer, 'tabs', (), types=(list, tuple)):
-        tab_renderer = multi_deep_get(tab, ['tabRenderer'], ['expandableTabRenderer'], default=None, types=dict)
-        if tab_renderer is None:
-            continue
-        if tab_renderer.get('selected', False):
-            return get(tab_renderer, 'content', {}, types=(dict))
-    print('Could not find tab with content')
-    return {}
-
-def traverse_standard_list(renderer):
-    renderer_list = multi_deep_get(renderer, ['contents'], ['items'], default=(), types=(list, tuple))
-    continuation = deep_get(renderer, 'continuations', 0, 'nextContinuationData', 'continuation')
-    return renderer_list, continuation
-
-# these renderers contain one inside them
-nested_renderer_dispatch = {
-    'singleColumnBrowseResultsRenderer': traverse_browse_renderer,
-    'twoColumnBrowseResultsRenderer': traverse_browse_renderer,
-    'twoColumnSearchResultsRenderer': lambda renderer: get(renderer, 'primaryContents', {}, types=dict),
-}
-
-# these renderers contain a list of renderers in side them
-nested_renderer_list_dispatch = {
-    'sectionListRenderer': traverse_standard_list,
-    'itemSectionRenderer': traverse_standard_list,
-    'gridRenderer': traverse_standard_list,
-    'playlistVideoListRenderer': traverse_standard_list,
-    'singleColumnWatchNextResults': lambda r: (deep_get(r, 'results', 'results', 'contents', default=[], types=(list, tuple)), None),
-}
-
-def extract_items(response, item_types=item_types):
-    '''return items, ctoken'''
-    if 'continuationContents' in response:
-        # always has just the one [something]Continuation key, but do this just in case they add some tracking key or something
-        for key, renderer_continuation in get(response, 'continuationContents', {}, types=dict).items():
-            if key.endswith('Continuation'):    # e.g. commentSectionContinuation, playlistVideoListContinuation
-                items = multi_deep_get(renderer_continuation, ['contents'], ['items'], default=[], types=(list, tuple))
-                ctoken = deep_get(renderer_continuation, 'continuations', 0, 'nextContinuationData', 'continuation', default=None, types=str)
-                return items, ctoken
-        return [], None
-    elif 'contents' in response:
-        ctoken = None
-        items = []
-
-        iter_stack = collections.deque()
-        current_iter = iter(())
-
-        renderer = get(response, 'contents', {}, types=dict)
-
-        while True:
-            # mode 1: dig into the current renderer
-            # Will stay in mode 1 (via continue) if a new renderer is found inside this one
-            # Otherwise, after finding that it is an item renderer,
-            # contains a list, or contains nothing,
-            # falls through into mode 2 to get a new renderer
-            if len(renderer) != 0:
-                key, value = list(renderer.items())[0]
-
-                # has a list in it, add it to the iter stack
-                if key in nested_renderer_list_dispatch:
-                    renderer_list, continuation = nested_renderer_list_dispatch[key](value)
-                    if renderer_list:
-                        iter_stack.append(current_iter)
-                        current_iter = iter(renderer_list)
-                    if continuation:
-                        ctoken = continuation
-
-                # new renderer nested inside this one
-                elif key in nested_renderer_dispatch:
-                    renderer = nested_renderer_dispatch[key](value)
-                    continue    # back to mode 1
-
-                # the renderer is an item
-                elif key in item_types:
-                    items.append(renderer)
-
-
-            # mode 2: get a new renderer by iterating.
-            # goes up the stack for an iterator if one has been exhausted
-            while current_iter is not None:
-                try:
-                    renderer = current_iter.__next__()
-                    break
-                except StopIteration:
-                    try:
-                        current_iter = iter_stack.pop()   # go back up the stack
-                    except IndexError:
-                        return items, ctoken
-
-    else:
-        return [], None
-
-def extract_channel_info(polymer_json, tab):
-    response, err = extract_response(polymer_json)
-    if err:
-        return {'error': err}
-
-    try:
-        microformat = response['microformat']['microformatDataRenderer']
-
-    # channel doesn't exist or was terminated
-    # example terminated channel: https://www.youtube.com/channel/UCnKJeK_r90jDdIuzHXC0Org
-    except KeyError:
-        if 'alerts' in response and len(response['alerts']) > 0:
-            return {'error': ' '.join(alert['alertRenderer']['text']['simpleText'] for alert in response['alerts']) }
-        elif 'errors' in response['responseContext']:
-            for error in response['responseContext']['errors']['error']:
-                if error['code'] == 'INVALID_VALUE' and error['location'] == 'browse_id':
-                    return {'error': 'This channel does not exist'}
-        return {'error': 'Failure getting microformat'}
-
-    info = {'error': None}
-    info['current_tab'] = tab
-
-
-    # stuff from microformat (info given by youtube for every page on channel)
-    info['short_description'] = microformat['description']
-    info['channel_name'] = microformat['title']
-    info['avatar'] = microformat['thumbnail']['thumbnails'][0]['url']
-    channel_url = microformat['urlCanonical'].rstrip('/')
-    channel_id = channel_url[channel_url.rfind('/')+1:]
-    info['channel_id'] = channel_id
-    info['channel_url'] = 'https://www.youtube.com/channel/' + channel_id
-
-    info['items'] = []
-
-    # empty channel
-    if 'contents' not in response and 'continuationContents' not in response:
-        return info
-
-
-    items, _ = extract_items(response)
-    if tab in ('videos', 'playlists', 'search'):
-        additional_info = {'author': info['channel_name'], 'author_url': 'https://www.youtube.com/channel/' + channel_id}
-        info['items'] = [extract_item_info(renderer, additional_info) for renderer in items]
-
-    elif tab == 'about':
-        for item in items:
-            try:
-                channel_metadata = item['channelAboutFullMetadataRenderer']
-                break
-            except KeyError:
-                pass
-        else:
-            info['error'] = 'Could not find channelAboutFullMetadataRenderer'
-            return info
-
-        info['links'] = []
-        for link_json in channel_metadata.get('primaryLinks', ()):
-            url = remove_redirect(link_json['navigationEndpoint']['urlEndpoint']['url'])
-
-            text = extract_str(link_json['title'])
-
-            info['links'].append( (text, url) )
-
-
-        info['stats'] = []
-        for stat_name in ('subscriberCountText', 'joinedDateText', 'viewCountText', 'country'):
-            try:
-                stat = channel_metadata[stat_name]
-            except KeyError:
-                continue
-            info['stats'].append(extract_str(stat))
-
-        if 'description' in channel_metadata:
-            info['description'] = extract_str(channel_metadata['description'])
-        else:
-            info['description'] = ''
-
-    else:
-        raise NotImplementedError('Unknown or unsupported channel tab: ' + tab)
-
-    return info
-
-def extract_search_info(polymer_json):
-    response, err = extract_response(polymer_json)
-    if err:
-        return {'error': err}
-    info = {'error': None}
-    info['estimated_results'] = int(response['estimatedResults'])
-    info['estimated_pages'] = ceil(info['estimated_results']/20)
-
-
-    results, _ = extract_items(response)
-
-
-    info['items'] = []
-    info['corrections'] = {'type': None}
-    for renderer in results:
-        type = list(renderer.keys())[0]
-        if type == 'shelfRenderer':
-            continue
-        if type == 'didYouMeanRenderer':
-            renderer = renderer[type]
-
-            info['corrections'] = {
-                'type': 'did_you_mean',
-                'corrected_query': renderer['correctedQueryEndpoint']['searchEndpoint']['query'],
-                'corrected_query_text': renderer['correctedQuery']['runs'],
-            }
-            continue
-        if type == 'showingResultsForRenderer':
-            renderer = renderer[type]
-
-            info['corrections'] = {
-                'type': 'showing_results_for',
-                'corrected_query_text': renderer['correctedQuery']['runs'],
-                'original_query_text': renderer['originalQuery']['simpleText'],
-            }
-            continue
-
-        i_info = extract_item_info(renderer)
-        if i_info.get('type') != 'unsupported':
-            info['items'].append(i_info)
-
-
-    return info
-
-def extract_playlist_metadata(polymer_json):
-    response, err = extract_response(polymer_json)
-    if err:
-        return {'error': err}
-
-    metadata = {'error': None}
-    header = deep_get(response, 'header', 'playlistHeaderRenderer', default={})
-    metadata['title'] = extract_str(header.get('title'))
-
-    metadata['first_video_id'] = deep_get(header, 'playEndpoint', 'watchEndpoint', 'videoId')
-    first_id = re.search(r'([a-z_\-]{11})', deep_get(header,
-        'thumbnail', 'thumbnails', 0, 'url', default=''))
-    if first_id:
-        conservative_update(metadata, 'first_video_id', first_id.group(1))
-    if metadata['first_video_id'] is None:
-        metadata['thumbnail'] = None
-    else:
-        metadata['thumbnail'] = 'https://i.ytimg.com/vi/' + metadata['first_video_id'] + '/mqdefault.jpg'
-
-    metadata['video_count'] = extract_int(header.get('numVideosText'))
-    metadata['description'] = extract_str(header.get('descriptionText'), default='')
-    metadata['author'] = extract_str(header.get('ownerText'))
-    metadata['author_id'] = multi_deep_get(header, 
-        ['ownerText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId'],
-        ['ownerEndpoint', 'browseEndpoint', 'browseId'])
-    if metadata['author_id']:
-        metadata['author_url'] = 'https://www.youtube.com/channel/' + metadata['author_id']
-    else:
-        metadata['author_url'] = None
-    metadata['view_count'] = extract_int(header.get('viewCountText'))
-    metadata['like_count'] = extract_int(header.get('likesCountWithoutLikeText'))
-    for stat in header.get('stats', ()):
-        text = extract_str(stat)
-        if 'videos' in text:
-            conservative_update(metadata, 'video_count', extract_int(text))
-        elif 'views' in text:
-            conservative_update(metadata, 'view_count', extract_int(text))
-        elif 'updated' in text:
-            metadata['time_published'] = extract_date(text)
-
-    return metadata
-
-def extract_playlist_info(polymer_json):
-    response, err = extract_response(polymer_json)
-    if err:
-        return {'error': err}
-    info = {'error': None}
-    first_page = 'continuationContents' not in response
-    video_list, _ = extract_items(response)
-
-    info['items'] = [extract_item_info(renderer) for renderer in video_list]
-
-    if first_page:
-        info['metadata'] = extract_playlist_metadata(polymer_json)
-
-    return info
-
-def ctoken_metadata(ctoken):
-    result = dict()
-    params = proto.parse(proto.b64_to_bytes(ctoken))
-    result['video_id'] = proto.parse(params[2])[2].decode('ascii')
-
-    offset_information = proto.parse(params[6])
-    result['offset'] = offset_information.get(5, 0)
-
-    result['is_replies'] = False
-    if (3 in offset_information) and (2 in proto.parse(offset_information[3])):
-        result['is_replies'] = True
-        result['sort'] = None
-    else:
-        try:
-            result['sort'] = proto.parse(offset_information[4])[6]
-        except KeyError:
-            result['sort'] = 0
-    return result
-
-def extract_comments_info(polymer_json):
-    response, err = extract_response(polymer_json)
-    if err:
-        return {'error': err}
-    info = {'error': None}
-
-    url = multi_deep_get(polymer_json, [1, 'url'], ['url'])
-    if url:
-        ctoken = urllib.parse.parse_qs(url[url.find('?')+1:])['ctoken'][0]
-        metadata = ctoken_metadata(ctoken)
-    else:
-        metadata = {}
-    info['video_id'] = metadata.get('video_id')
-    info['offset'] = metadata.get('offset')
-    info['is_replies'] = metadata.get('is_replies')
-    info['sort'] = metadata.get('sort')
-    info['video_title'] = None
-
-    comments, ctoken = extract_items(response)
-    info['comments'] = []
-    info['ctoken'] = ctoken
-    for comment in comments:
-        comment_info = {}
-
-        if 'commentThreadRenderer' in comment:  # top level comments
-            conservative_update(info, 'is_replies', False)
-            comment_thread  = comment['commentThreadRenderer']
-            info['video_title'] = extract_str(comment_thread.get('commentTargetTitle'))
-            if 'replies' not in comment_thread:
-                comment_info['reply_count'] = 0
-            else:
-                comment_info['reply_count'] = extract_int(deep_get(comment_thread,
-                    'replies', 'commentRepliesRenderer', 'moreText'
-                ), default=1)   # With 1 reply, the text reads "View reply"
-            comment_renderer = deep_get(comment_thread, 'comment', 'commentRenderer', default={})
-        elif 'commentRenderer' in comment:  # replies
-            comment_info['reply_count'] = 0     # replyCount, below, not present for replies even if the reply has further replies to it
-            conservative_update(info, 'is_replies', True)
-            comment_renderer = comment['commentRenderer']
-        else:
-            comment_renderer = {}
-
-        # These 3 are sometimes absent, likely because the channel was deleted
-        comment_info['author'] = extract_str(comment_renderer.get('authorText'))
-        comment_info['author_url'] = deep_get(comment_renderer,
-            'authorEndpoint', 'commandMetadata', 'webCommandMetadata', 'url')
-        comment_info['author_id'] = deep_get(comment_renderer,
-            'authorEndpoint', 'browseEndpoint', 'browseId')
-
-        comment_info['author_avatar'] = deep_get(comment_renderer,
-            'authorThumbnail', 'thumbnails', 0, 'url')
-        comment_info['id'] = comment_renderer.get('commentId')
-        comment_info['text'] = extract_formatted_text(comment_renderer.get('contentText'))
-        comment_info['time_published'] = extract_str(comment_renderer.get('publishedTimeText'))
-        comment_info['like_count'] = comment_renderer.get('likeCount')
-        liberal_update(comment_info, 'reply_count', comment_renderer.get('replyCount'))
-
-        info['comments'].append(comment_info)
-
-    return info
-
-def check_missing_keys(object, *key_sequences):
-    for key_sequence in key_sequences:
-        _object = object
-        try:
-            for key in key_sequence:
-                _object = _object[key]
-        except (KeyError, IndexError, TypeError):
-            return 'Could not find ' + key
-
-    return None
-
-def extract_metadata_row_info(video_renderer_info):
-    # extract category and music list
-    info = {
-        'category': None,
-        'music_list': [],
-    }
-
-    current_song = {}
-    for row in deep_get(video_renderer_info, 'metadataRowContainer', 'metadataRowContainerRenderer', 'rows', default=[]):
-        row_title = extract_str(deep_get(row, 'metadataRowRenderer', 'title'), default='')
-        row_content = extract_str(deep_get(row, 'metadataRowRenderer', 'contents', 0))
-        if row_title == 'Category':
-            info['category'] = row_content
-        elif row_title in ('Song', 'Music'):
-            if current_song:
-                info['music_list'].append(current_song)
-            current_song = {'title': row_content}
-        elif row_title == 'Artist':
-            current_song['artist'] = row_content
-        elif row_title == 'Album':
-            current_song['album'] = row_content
-        elif row_title == 'Writers':
-            current_song['writers'] = row_content
-        elif row_title.startswith('Licensed'):
-            current_song['licensor'] = row_content
-    if current_song:
-        info['music_list'].append(current_song)
-
-    return info
-
-def extract_date(date_text):
-    if date_text is None:
-        return None
-
-    date_text = date_text.replace(',', '').lower()
-    parts = date_text.split()
-    if len(parts) >= 3:
-        month, day, year = parts[-3:]
-        month = month_abbreviations.get(month[0:3]) # slicing in case they start writing out the full month name
-        if month and (re.fullmatch(r'\d\d?', day) is not None) and (re.fullmatch(r'\d{4}', year) is not None):
-            return year + '-' + month + '-' + day
-
-def extract_watch_info_mobile(top_level):
-    info = {}
-    microformat = deep_get(top_level, 'playerResponse', 'microformat', 'playerMicroformatRenderer', default={})
-
-    family_safe = microformat.get('isFamilySafe')
-    if family_safe is None:
-        info['age_restricted'] = None
-    else:
-        info['age_restricted'] = not family_safe
-    info['allowed_countries'] = microformat.get('availableCountries', [])
-    info['time_published'] = microformat.get('publishDate')
-
-    response = top_level.get('response', {})
-
-    # video info from metadata renderers
-    items, _ = extract_items(response, item_types={'slimVideoMetadataRenderer'})
-    if items:
-        video_info = items[0]['slimVideoMetadataRenderer']
-    else:
-        print('Failed to extract video metadata')
-        video_info = {}
-
-    info.update(extract_metadata_row_info(video_info))
-    info['description'] = extract_str(video_info.get('description'), recover_urls=True)
-    info['view_count'] = extract_int(extract_str(video_info.get('expandedSubtitle')))
-    info['author'] = extract_str(deep_get(video_info, 'owner', 'slimOwnerRenderer', 'title'))
-    info['author_id'] = deep_get(video_info, 'owner', 'slimOwnerRenderer', 'navigationEndpoint', 'browseEndpoint', 'browseId')
-    info['title'] = extract_str(video_info.get('title'))
-    info['live'] = 'watching' in extract_str(video_info.get('expandedSubtitle'), default='')
-    info['unlisted'] = False
-    for badge in video_info.get('badges', []):
-        if deep_get(badge, 'metadataBadgeRenderer', 'label') == 'Unlisted':
-            info['unlisted'] = True
-    info['like_count'] = None
-    info['dislike_count'] = None
-    if not info['time_published']:
-        info['time_published'] = extract_date(extract_str(video_info.get('dateText', None)))
-    for button in video_info.get('buttons', ()):
-        button_renderer = button.get('slimMetadataToggleButtonRenderer', {})
-
-        # all the digits can be found in the accessibility data
-        count = extract_int(deep_get(button_renderer, 'button', 'toggleButtonRenderer', 'defaultText', 'accessibility', 'accessibilityData', 'label'))
-
-        # this count doesn't have all the digits, it's like 53K for instance
-        dumb_count = extract_int(extract_str(deep_get(button_renderer, 'button', 'toggleButtonRenderer', 'defaultText')))
-
-        # the accessibility text will be "No likes" or "No dislikes" or something like that, but dumb count will be 0
-        if dumb_count == 0:
-            count = 0
-
-        if 'isLike' in button_renderer:
-            info['like_count'] = count
-        elif 'isDislike' in button_renderer:
-            info['dislike_count'] = count
-
-    # comment section info
-    items, _ = extract_items(response, item_types={'commentSectionRenderer'})
-    if items:
-        comment_info = items[0]['commentSectionRenderer']
-        comment_count_text = extract_str(deep_get(comment_info, 'header', 'commentSectionHeaderRenderer', 'countText'))
-        if comment_count_text == 'Comments':    # just this with no number, means 0 comments
-            info['comment_count'] = 0
-        else:
-            info['comment_count'] = extract_int(comment_count_text)
-        info['comments_disabled'] = False
-    else:   # no comment section present means comments are disabled
-        info['comment_count'] = 0
-        info['comments_disabled'] = True
-
-    # check for limited state
-    items, _ = extract_items(response, item_types={'limitedStateMessageRenderer'})
-    if items:
-        info['limited_state'] = True
-    else:
-        info['limited_state'] = False
-
-    # related videos
-    related, _ = extract_items(response)
-    info['related_videos'] = [extract_item_info(renderer) for renderer in related]
-
-    return info
-
-month_abbreviations = {'jan':'1', 'feb':'2', 'mar':'3', 'apr':'4', 'may':'5', 'jun':'6', 'jul':'7', 'aug':'8', 'sep':'9', 'oct':'10', 'nov':'11', 'dec':'12'}
-def extract_watch_info_desktop(top_level):
-    info = {
-        'comment_count': None,
-        'comments_disabled': None,
-        'allowed_countries': None,
-        'limited_state': None,
-    }
-
-    video_info = {}
-    for renderer in deep_get(top_level, 'response', 'contents', 'twoColumnWatchNextResults', 'results', 'results', 'contents', default=()):
-        if renderer and list(renderer.keys())[0] in ('videoPrimaryInfoRenderer', 'videoSecondaryInfoRenderer'):
-            video_info.update(list(renderer.values())[0])
-
-    info.update(extract_metadata_row_info(video_info))
-    info['description'] = extract_str(video_info.get('description', None), recover_urls=True)
-    info['time_published'] = extract_date(extract_str(video_info.get('dateText', None)))
-
-    likes_dislikes = deep_get(video_info, 'sentimentBar', 'sentimentBarRenderer', 'tooltip', default='').split('/')
-    if len(likes_dislikes) == 2:
-        info['like_count'] = extract_int(likes_dislikes[0])
-        info['dislike_count'] = extract_int(likes_dislikes[1])
-    else:
-        info['like_count'] = None
-        info['dislike_count'] = None
-
-    info['title'] = extract_str(video_info.get('title', None))
-    info['author'] = extract_str(deep_get(video_info, 'owner', 'videoOwnerRenderer', 'title'))
-    info['author_id'] = deep_get(video_info, 'owner', 'videoOwnerRenderer', 'navigationEndpoint', 'browseEndpoint', 'browseId')
-    info['view_count'] = extract_int(extract_str(deep_get(video_info, 'viewCount', 'videoViewCountRenderer', 'viewCount')))
-
-    related = deep_get(top_level, 'response', 'contents', 'twoColumnWatchNextResults', 'secondaryResults', 'secondaryResults', 'results', default=[])
-    info['related_videos'] = [extract_item_info(renderer) for renderer in related]
-
-    return info
-
-def get_caption_url(info, language, format, automatic=False, translation_language=None):
-    '''Gets the url for captions with the given language and format. If automatic is True, get the automatic captions for that language. If translation_language is given, translate the captions from `language` to `translation_language`. If automatic is true and translation_language is given, the automatic captions will be translated.'''
-    url = info['_captions_base_url']
-    url += '&lang=' + language
-    url += '&fmt=' + format
-    if automatic:
-        url += '&kind=asr'
-    elif language in info['_manual_caption_language_names']:
-        url += '&name=' + urllib.parse.quote(info['_manual_caption_language_names'][language], safe='')
-
-    if translation_language:
-        url += '&tlang=' + translation_language
-    return url
-
-def extract_formats(info, player_response):
-    streaming_data = player_response.get('streamingData', {})
-    yt_formats = streaming_data.get('formats', []) + streaming_data.get('adaptiveFormats', [])
-
-    info['formats'] = []
-
-    for yt_fmt in yt_formats:
-        fmt = {}
-        fmt['ext'] = None
-        fmt['audio_bitrate'] = None
-        fmt['acodec'] = None
-        fmt['vcodec'] = None
-        fmt['width'] = yt_fmt.get('width')
-        fmt['height'] = yt_fmt.get('height')
-        fmt['file_size'] = yt_fmt.get('contentLength')
-        fmt['audio_sample_rate'] = yt_fmt.get('audioSampleRate')
-        fmt['fps'] = yt_fmt.get('fps')
-        cipher = dict(urllib.parse.parse_qsl(yt_fmt.get('cipher', '')))
-        if cipher:
-            fmt['url'] = cipher.get('url')
-        else:
-            fmt['url'] = yt_fmt.get('url')
-        fmt['s'] = cipher.get('s')
-        fmt['sp'] = cipher.get('sp')
-        fmt.update(_formats.get(str(yt_fmt.get('itag')), {}))
-
-        info['formats'].append(fmt)
-
-def extract_playability_error(info, player_response, error_prefix=''):
-    if info['formats']:
-        info['playability_status'] = None
-        info['playability_error'] = None
-        return
-
-    playability_status = deep_get(player_response, 'playabilityStatus', 'status', default=None)
-    info['playability_status'] = playability_status
-
-    playability_reason = extract_str(multi_deep_get(player_response,
-        ['playabilityStatus', 'reason'],
-        ['playabilityStatus', 'errorScreen', 'playerErrorMessageRenderer', 'reason'],
-        default='Could not find playability error')
-    )
-
-    if playability_status not in (None, 'OK'):
-        info['playability_error'] = error_prefix + playability_reason
-    else:
-        info['playability_error'] = error_prefix + 'Unknown playability error'
-
-SUBTITLE_FORMATS = ('srv1', 'srv2', 'srv3', 'ttml', 'vtt')
-def extract_watch_info(polymer_json):
-    info = {'playability_error': None, 'error': None}
-
-    if isinstance(polymer_json, dict):
-        top_level = polymer_json
-    elif isinstance(polymer_json, (list, tuple)):
-        top_level = {}
-        for page_part in polymer_json:
-            if not isinstance(page_part, dict):
-                return {'error': 'Invalid page part'}
-            top_level.update(page_part)
-    else:
-        return {'error': 'Invalid top level polymer data'}
-
-    error = check_missing_keys(top_level,
-        ['player', 'args'],
-        ['player', 'assets', 'js'],
-        ['playerResponse'],
-    )
-    if error:
-        info['playability_error'] = error
-
-    player_args = deep_get(top_level, 'player', 'args', default={})
-    player_response = json.loads(player_args['player_response']) if 'player_response' in player_args else {}
-
-    # captions
-    info['automatic_caption_languages'] = []
-    info['manual_caption_languages'] = []
-    info['_manual_caption_language_names'] = {}     # language name written in that language, needed in some cases to create the url
-    info['translation_languages'] = []
-    captions_info = player_response.get('captions', {})
-    info['_captions_base_url'] = normalize_url(deep_get(captions_info, 'playerCaptionsRenderer', 'baseUrl'))
-    for caption_track in deep_get(captions_info, 'playerCaptionsTracklistRenderer', 'captionTracks', default=()):
-        lang_code = caption_track.get('languageCode')
-        if not lang_code:
-            continue
-        if caption_track.get('kind') == 'asr':
-            info['automatic_caption_languages'].append(lang_code)
-        else:
-            info['manual_caption_languages'].append(lang_code)
-        base_url = caption_track.get('baseUrl', '')
-        lang_name = deep_get(urllib.parse.parse_qs(urllib.parse.urlparse(base_url).query), 'name', 0)
-        if lang_name:
-            info['_manual_caption_language_names'][lang_code] = lang_name
-
-    for translation_lang_info in deep_get(captions_info, 'playerCaptionsTracklistRenderer', 'translationLanguages', default=()):
-        lang_code = translation_lang_info.get('languageCode')
-        if lang_code:
-            info['translation_languages'].append(lang_code)
-        if translation_lang_info.get('isTranslatable') == False:
-            print('WARNING: Found non-translatable caption language')
-
-    # formats
-    extract_formats(info, player_response)
-
-    # playability errors
-    extract_playability_error(info, player_response)
-
-    # check age-restriction
-    info['age_restricted'] = (info['playability_status'] == 'LOGIN_REQUIRED' and info['playability_error'] and ' age' in info['playability_error'])
-
-    # base_js (for decryption of signatures)
-    info['base_js'] = deep_get(top_level, 'player', 'assets', 'js')
-    if info['base_js']:
-        info['base_js'] = normalize_url(info['base_js'])
-
-    mobile = 'singleColumnWatchNextResults' in deep_get(top_level, 'response', 'contents', default={})
-    if mobile:
-        info.update(extract_watch_info_mobile(top_level))
-    else:
-        info.update(extract_watch_info_desktop(top_level))
-
-    # stuff from videoDetails. Use liberal_update to prioritize info from videoDetails over existing info
-    vd = deep_get(top_level, 'playerResponse', 'videoDetails', default={})
-    liberal_update(info, 'title',      extract_str(vd.get('title')))
-    liberal_update(info, 'duration',   extract_int(vd.get('lengthSeconds')))
-    liberal_update(info, 'view_count', extract_int(vd.get('viewCount')))
-    # videos with no description have a blank string
-    liberal_update(info, 'description', vd.get('shortDescription'))
-    liberal_update(info, 'id',          vd.get('videoId'))
-    liberal_update(info, 'author',      vd.get('author'))
-    liberal_update(info, 'author_id',   vd.get('channelId'))
-    liberal_update(info, 'live',        vd.get('isLiveContent'))
-    conservative_update(info, 'unlisted', not vd.get('isCrawlable', True))  #isCrawlable is false on limited state videos even if they aren't unlisted
-    liberal_update(info, 'tags',        vd.get('keywords', []))
-
-    # fallback stuff from microformat
-    mf = deep_get(top_level, 'playerResponse', 'microformat', 'playerMicroformatRenderer', default={})
-    conservative_update(info, 'title',      extract_str(mf.get('title')))
-    conservative_update(info, 'duration', extract_int(mf.get('lengthSeconds')))
-    # this gives the view count for limited state videos
-    conservative_update(info, 'view_count', extract_int(mf.get('viewCount')))
-    conservative_update(info, 'description', extract_str(mf.get('description'), recover_urls=True))
-    conservative_update(info, 'author', mf.get('ownerChannelName'))
-    conservative_update(info, 'author_id', mf.get('externalChannelId'))
-    liberal_update(info, 'unlisted', mf.get('isUnlisted'))
-    liberal_update(info, 'category', mf.get('category'))
-    liberal_update(info, 'time_published', mf.get('publishDate'))
-    liberal_update(info, 'time_uploaded', mf.get('uploadDate'))
-
-    # other stuff
-    info['author_url'] = 'https://www.youtube.com/channel/' + info['author_id'] if info['author_id'] else None
-    return info
-
-def update_with_age_restricted_info(info, video_info_page):
-    ERROR_PREFIX = 'Error bypassing age-restriction: '
-
-    video_info = urllib.parse.parse_qs(video_info_page)
-    player_response = deep_get(video_info, 'player_response', 0)
-    if player_response is None:
-        info['playability_error'] = ERROR_PREFIX + 'Could not find player_response in video_info_page'
-        return
-    try:
-        player_response = json.loads(player_response)
-    except json.decoder.JSONDecodeError:
-        traceback.print_exc()
-        info['playability_error'] = ERROR_PREFIX + 'Failed to parse json response'
-        return
-
-    extract_formats(info, player_response)
-    extract_playability_error(info, player_response, error_prefix=ERROR_PREFIX)
diff --git a/youtube/yt_data_extract/__init__.py b/youtube/yt_data_extract/__init__.py
new file mode 100644
index 0000000..f2a93a9
--- /dev/null
+++ b/youtube/yt_data_extract/__init__.py
@@ -0,0 +1,11 @@
+from .common import (get, multi_get, deep_get, multi_deep_get,
+    liberal_update, conservative_update, remove_redirect, normalize_url,
+    extract_str, extract_formatted_text, extract_int, extract_approx_int,
+    extract_date, extract_item_info, extract_items, extract_response,
+    prefix_urls, add_extra_html_info, parse_info_prepare_for_html)
+
+from .everything_else import (extract_channel_info, extract_search_info,
+    extract_playlist_metadata, extract_playlist_info, extract_comments_info)
+
+from .watch_extraction import (extract_watch_info, get_caption_url,
+    update_with_age_restricted_info)
diff --git a/youtube/yt_data_extract/common.py b/youtube/yt_data_extract/common.py
new file mode 100644
index 0000000..5fa67bc
--- /dev/null
+++ b/youtube/yt_data_extract/common.py
@@ -0,0 +1,455 @@
+from youtube import util
+
+import json
+import re
+import urllib.parse
+import collections
+
+def get(object, key, default=None, types=()):
+    '''Like dict.get(), but returns default if the result doesn't match one of the types.
+       Also works for indexing lists.'''
+    try:
+        result = object[key]
+    except (TypeError, IndexError, KeyError):
+        return default
+
+    if not types or isinstance(result, types):
+        return result
+    else:
+        return default
+
+def multi_get(object, *keys, default=None, types=()):
+    '''Like get, but try other keys if the first fails'''
+    for key in keys:
+        try:
+            result = object[key]
+        except (TypeError, IndexError, KeyError):
+            pass
+        else:
+            if not types or isinstance(result, types):
+                return result
+            else:
+                continue
+    return default
+
+
+def deep_get(object, *keys, default=None, types=()):
+    '''Like dict.get(), but for nested dictionaries/sequences, supporting keys or indices.
+       Last argument is the default value to use in case of any IndexErrors or KeyErrors.
+       If types is given and the result doesn't match one of those types, default is returned'''
+    try:
+        for key in keys:
+            object = object[key]
+    except (TypeError, IndexError, KeyError):
+        return default
+    else:
+        if not types or isinstance(object, types):
+            return object
+        else:
+            return default
+
+def multi_deep_get(object, *key_sequences, default=None, types=()):
+    '''Like deep_get, but can try different key sequences in case one fails.
+       Return default if all of them fail. key_sequences is a list of lists'''
+    for key_sequence in key_sequences:
+        _object = object
+        try:
+            for key in key_sequence:
+                _object = _object[key]
+        except (TypeError, IndexError, KeyError):
+            pass
+        else:
+            if not types or isinstance(_object, types):
+                return _object
+            else:
+                continue
+    return default
+
+def liberal_update(obj, key, value):
+    '''Updates obj[key] with value as long as value is not None.
+    Ensures obj[key] will at least get a value of None, however'''
+    if (value is not None) or (key not in obj):
+        obj[key] = value
+
+def conservative_update(obj, key, value):
+    '''Only updates obj if it doesn't have key or obj[key] is None'''
+    if obj.get(key) is None:
+        obj[key] = value
+
+def remove_redirect(url):
+    if re.fullmatch(r'(((https?:)?//)?(www.)?youtube.com)?/redirect\?.*', url) is not None: # youtube puts these on external links to do tracking
+        query_string = url[url.find('?')+1: ]
+        return urllib.parse.parse_qs(query_string)['q'][0]
+    return url
+
+youtube_url_re = re.compile(r'^(?:(?:(?:https?:)?//)?(?:www\.)?youtube\.com)?(/.*)$')
+def normalize_url(url):
+    if url is None:
+        return None
+    match = youtube_url_re.fullmatch(url)
+    if match is None:
+        raise Exception()
+
+    return 'https://www.youtube.com' + match.group(1)
+
+def _recover_urls(runs):
+    for run in runs:
+        url = deep_get(run, 'navigationEndpoint', 'urlEndpoint', 'url')
+        text = run.get('text', '')
+        # second condition is necessary because youtube makes other things into urls, such as hashtags, which we want to keep as text
+        if url is not None and (text.startswith('http://') or text.startswith('https://')):
+            url = remove_redirect(url)
+            run['url'] = url
+            run['text'] = url # youtube truncates the url text, use actual url instead
+
+def extract_str(node, default=None, recover_urls=False):
+    '''default is the value returned if the extraction fails. If recover_urls is true, will attempt to fix Youtube's truncation of url text (most prominently seen in descriptions)'''
+    if isinstance(node, str):
+        return node
+
+    try:
+        return node['simpleText']
+    except (KeyError, TypeError):
+        pass
+
+    if isinstance(node, dict) and 'runs' in node:
+        if recover_urls:
+            _recover_urls(node['runs'])
+        return ''.join(text_run.get('text', '') for text_run in node['runs'])
+
+    return default
+
+def extract_formatted_text(node):
+    if not node:
+        return []
+    if 'runs' in node:
+        _recover_urls(node['runs'])
+        return node['runs']
+    elif 'simpleText' in node:
+        return [{'text': node['simpleText']}]
+    return []
+
+def extract_int(string, default=None):
+    if isinstance(string, int):
+        return string
+    if not isinstance(string, str):
+        string = extract_str(string)
+    if not string:
+        return default
+    match = re.search(r'(\d+)', string.replace(',', ''))
+    if match is None:
+        return default
+    try:
+        return int(match.group(1))
+    except ValueError:
+        return default
+
+def extract_approx_int(string):
+    '''e.g. "15M" from "15M subscribers"'''
+    if not isinstance(string, str):
+        string = extract_str(string)
+    if not string:
+        return None
+    match = re.search(r'(\d+[KMBTkmbt])', string.replace(',', ''))
+    if match is None:
+        return None
+    return match.group(1)
+
+def extract_date(date_text):
+    '''Input: "Mar 9, 2019". Output: "2019-3-9"'''
+    if date_text is None:
+        return None
+
+    date_text = date_text.replace(',', '').lower()
+    parts = date_text.split()
+    if len(parts) >= 3:
+        month, day, year = parts[-3:]
+        month = month_abbreviations.get(month[0:3]) # slicing in case they start writing out the full month name
+        if month and (re.fullmatch(r'\d\d?', day) is not None) and (re.fullmatch(r'\d{4}', year) is not None):
+            return year + '-' + month + '-' + day
+
+def check_missing_keys(object, *key_sequences):
+    for key_sequence in key_sequences:
+        _object = object
+        try:
+            for key in key_sequence:
+                _object = _object[key]
+        except (KeyError, IndexError, TypeError):
+            return 'Could not find ' + key
+
+    return None
+
+def prefix_urls(item):
+    try:
+        item['thumbnail'] = util.prefix_url(item['thumbnail'])
+    except KeyError:
+        pass
+
+    try:
+        item['author_url'] = util.prefix_url(item['author_url'])
+    except KeyError:
+        pass
+
+def add_extra_html_info(item):
+    if item['type'] == 'video':
+        item['url'] = (util.URL_ORIGIN + '/watch?v=' + item['id']) if item.get('id') else None
+
+        video_info = {}
+        for key in ('id', 'title', 'author', 'duration'):
+            try:
+                video_info[key] = item[key]
+            except KeyError:
+                video_info[key] = ''
+
+        item['video_info'] = json.dumps(video_info)
+
+    elif item['type'] == 'playlist':
+        item['url'] = (util.URL_ORIGIN + '/playlist?list=' + item['id']) if item.get('id') else None
+    elif item['type'] == 'channel':
+        item['url'] = (util.URL_ORIGIN + "/channel/" + item['id']) if item.get('id') else None
+
+def extract_item_info(item, additional_info={}):
+    if not item:
+        return {'error': 'No item given'}
+
+    type = get(list(item.keys()), 0)
+    if not type:
+        return {'error': 'Could not find type'}
+    item = item[type]
+
+    info = {'error': None}
+    if type in ('itemSectionRenderer', 'compactAutoplayRenderer'):
+        return extract_item_info(deep_get(item, 'contents', 0), additional_info)
+
+    if type in ('movieRenderer', 'clarificationRenderer'):
+        info['type'] = 'unsupported'
+        return info
+
+    info.update(additional_info)
+
+    # type looks like e.g. 'compactVideoRenderer' or 'gridVideoRenderer'
+    # camelCase split, https://stackoverflow.com/a/37697078
+    type_parts = [s.lower() for s in re.sub(r'([A-Z][a-z]+)', r' \1', type).split()]
+    if len(type_parts) < 2:
+        info['type'] = 'unsupported'
+        return
+    primary_type = type_parts[-2]
+    if primary_type == 'video':
+        info['type'] = 'video'
+    elif primary_type in ('playlist', 'radio', 'show'):
+        info['type'] = 'playlist'
+    elif primary_type == 'channel':
+        info['type'] = 'channel'
+    else:
+        info['type'] = 'unsupported'
+
+    info['title'] = extract_str(item.get('title'))
+    info['author'] = extract_str(multi_get(item, 'longBylineText', 'shortBylineText', 'ownerText'))
+    info['author_id'] = extract_str(multi_deep_get(item,
+        ['longBylineText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId'],
+        ['shortBylineText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId'],
+        ['ownerText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId']
+    ))
+    info['author_url'] = ('https://www.youtube.com/channel/' + info['author_id']) if info['author_id'] else None
+    info['description'] = extract_formatted_text(multi_get(item, 'descriptionSnippet', 'descriptionText'))
+    info['thumbnail'] = multi_deep_get(item,
+        ['thumbnail', 'thumbnails', 0, 'url'],      # videos
+        ['thumbnails', 0, 'thumbnails', 0, 'url'],  # playlists
+        ['thumbnailRenderer', 'showCustomThumbnailRenderer', 'thumbnail', 'thumbnails', 0, 'url'], # shows
+    )
+
+    info['badges'] = []
+    for badge_node in multi_get(item, 'badges', 'ownerBadges', default=()):
+        badge = deep_get(badge_node, 'metadataBadgeRenderer', 'label')
+        if badge:
+            info['badges'].append(badge)
+
+    if primary_type in ('video', 'playlist'):
+        info['time_published'] = extract_str(item.get('publishedTimeText'))
+
+    if primary_type == 'video':
+        info['id'] = item.get('videoId')
+        info['view_count'] = extract_int(item.get('viewCountText'))
+
+        # dig into accessibility data to get view_count for videos marked as recommended, and to get time_published
+        accessibility_label = deep_get(item, 'title', 'accessibility', 'accessibilityData', 'label', default='')
+        timestamp = re.search(r'(\d+ \w+ ago)', accessibility_label)
+        if timestamp:
+            conservative_update(info, 'time_published', timestamp.group(1))
+        view_count = re.search(r'(\d+) views', accessibility_label.replace(',', ''))
+        if view_count:
+            conservative_update(info, 'view_count', int(view_count.group(1)))
+
+        if info['view_count']:
+            info['approx_view_count'] = '{:,}'.format(info['view_count'])
+        else:
+            info['approx_view_count'] = extract_approx_int(multi_get(item, 'shortViewCountText'))
+        info['duration'] = extract_str(item.get('lengthText'))
+    elif primary_type == 'playlist':
+        info['id'] = item.get('playlistId')
+        info['video_count'] = extract_int(item.get('videoCount'))
+    elif primary_type == 'channel':
+        info['id'] = item.get('channelId')
+        info['approx_subscriber_count'] = extract_approx_int(item.get('subscriberCountText'))
+    elif primary_type == 'show':
+        info['id'] = deep_get(item, 'navigationEndpoint', 'watchEndpoint', 'playlistId')
+
+    if primary_type in ('playlist', 'channel'):
+        conservative_update(info, 'video_count', extract_int(item.get('videoCountText')))
+
+    for overlay in item.get('thumbnailOverlays', []):
+        conservative_update(info, 'duration', extract_str(deep_get(
+            overlay, 'thumbnailOverlayTimeStatusRenderer', 'text'
+        )))
+        # show renderers don't have videoCountText
+        conservative_update(info, 'video_count', extract_int(deep_get(
+            overlay, 'thumbnailOverlayBottomPanelRenderer', 'text'
+        )))
+    return info
+
+def parse_info_prepare_for_html(renderer, additional_info={}):
+    item = extract_item_info(renderer, additional_info)
+    prefix_urls(item)
+    add_extra_html_info(item)
+
+    return item
+
+def extract_response(polymer_json):
+    '''return response, error'''
+    response = multi_deep_get(polymer_json, [1, 'response'], ['response'], default=None, types=dict)
+    if response is None:
+        return None, 'Failed to extract response'
+    else:
+        return response, None
+
+
+list_types = {
+    'sectionListRenderer',
+    'itemSectionRenderer',
+    'gridRenderer',
+    'playlistVideoListRenderer',
+}
+
+item_types = {
+    'movieRenderer',
+    'didYouMeanRenderer',
+    'showingResultsForRenderer',
+
+    'videoRenderer',
+    'compactVideoRenderer',
+    'compactAutoplayRenderer',
+    'gridVideoRenderer',
+    'playlistVideoRenderer',
+
+    'playlistRenderer',
+    'compactPlaylistRenderer',
+    'gridPlaylistRenderer',
+
+    'radioRenderer',
+    'compactRadioRenderer',
+    'gridRadioRenderer',
+
+    'showRenderer',
+    'compactShowRenderer',
+    'gridShowRenderer',
+
+
+    'channelRenderer',
+    'compactChannelRenderer',
+    'gridChannelRenderer',
+
+    'channelAboutFullMetadataRenderer',
+}
+
+def traverse_browse_renderer(renderer):
+    for tab in get(renderer, 'tabs', (), types=(list, tuple)):
+        tab_renderer = multi_deep_get(tab, ['tabRenderer'], ['expandableTabRenderer'], default=None, types=dict)
+        if tab_renderer is None:
+            continue
+        if tab_renderer.get('selected', False):
+            return get(tab_renderer, 'content', {}, types=(dict))
+    print('Could not find tab with content')
+    return {}
+
+def traverse_standard_list(renderer):
+    renderer_list = multi_deep_get(renderer, ['contents'], ['items'], default=(), types=(list, tuple))
+    continuation = deep_get(renderer, 'continuations', 0, 'nextContinuationData', 'continuation')
+    return renderer_list, continuation
+
+# these renderers contain one inside them
+nested_renderer_dispatch = {
+    'singleColumnBrowseResultsRenderer': traverse_browse_renderer,
+    'twoColumnBrowseResultsRenderer': traverse_browse_renderer,
+    'twoColumnSearchResultsRenderer': lambda renderer: get(renderer, 'primaryContents', {}, types=dict),
+}
+
+# these renderers contain a list of renderers inside them
+nested_renderer_list_dispatch = {
+    'sectionListRenderer': traverse_standard_list,
+    'itemSectionRenderer': traverse_standard_list,
+    'gridRenderer': traverse_standard_list,
+    'playlistVideoListRenderer': traverse_standard_list,
+    'singleColumnWatchNextResults': lambda r: (deep_get(r, 'results', 'results', 'contents', default=[], types=(list, tuple)), None),
+}
+
+def extract_items(response, item_types=item_types):
+    '''return items, ctoken'''
+    if 'continuationContents' in response:
+        # always has just the one [something]Continuation key, but do this just in case they add some tracking key or something
+        for key, renderer_continuation in get(response, 'continuationContents', {}, types=dict).items():
+            if key.endswith('Continuation'):    # e.g. commentSectionContinuation, playlistVideoListContinuation
+                items = multi_deep_get(renderer_continuation, ['contents'], ['items'], default=[], types=(list, tuple))
+                ctoken = deep_get(renderer_continuation, 'continuations', 0, 'nextContinuationData', 'continuation', default=None, types=str)
+                return items, ctoken
+        return [], None
+    elif 'contents' in response:
+        ctoken = None
+        items = []
+
+        iter_stack = collections.deque()
+        current_iter = iter(())
+
+        renderer = get(response, 'contents', {}, types=dict)
+
+        while True:
+            # mode 1: dig into the current renderer
+            # Will stay in mode 1 (via continue) if a new renderer is found inside this one
+            # Otherwise, after finding that it is an item renderer,
+            # contains a list, or contains nothing,
+            # falls through into mode 2 to get a new renderer
+            if len(renderer) != 0:
+                key, value = list(renderer.items())[0]
+
+                # has a list in it, add it to the iter stack
+                if key in nested_renderer_list_dispatch:
+                    renderer_list, continuation = nested_renderer_list_dispatch[key](value)
+                    if renderer_list:
+                        iter_stack.append(current_iter)
+                        current_iter = iter(renderer_list)
+                    if continuation:
+                        ctoken = continuation
+
+                # new renderer nested inside this one
+                elif key in nested_renderer_dispatch:
+                    renderer = nested_renderer_dispatch[key](value)
+                    continue    # back to mode 1
+
+                # the renderer is an item
+                elif key in item_types:
+                    items.append(renderer)
+
+
+            # mode 2: get a new renderer by iterating.
+            # goes up the stack for an iterator if one has been exhausted
+            while current_iter is not None:
+                try:
+                    renderer = current_iter.__next__()
+                    break
+                except StopIteration:
+                    try:
+                        current_iter = iter_stack.pop()   # go back up the stack
+                    except IndexError:
+                        return items, ctoken
+
+    else:
+        return [], None
diff --git a/youtube/yt_data_extract/everything_else.py b/youtube/yt_data_extract/everything_else.py
new file mode 100644
index 0000000..6277c8d
--- /dev/null
+++ b/youtube/yt_data_extract/everything_else.py
@@ -0,0 +1,273 @@
+from .common import (get, multi_get, deep_get, multi_deep_get,
+    liberal_update, conservative_update, remove_redirect, normalize_url,
+    extract_str, extract_formatted_text, extract_int, extract_approx_int,
+    extract_date, check_missing_keys, extract_item_info, extract_items,
+    extract_response)
+from youtube import proto
+
+import re
+import urllib
+from math import ceil
+
+def extract_channel_info(polymer_json, tab):
+    response, err = extract_response(polymer_json)
+    if err:
+        return {'error': err}
+
+    try:
+        microformat = response['microformat']['microformatDataRenderer']
+
+    # channel doesn't exist or was terminated
+    # example terminated channel: https://www.youtube.com/channel/UCnKJeK_r90jDdIuzHXC0Org
+    except KeyError:
+        if 'alerts' in response and len(response['alerts']) > 0:
+            return {'error': ' '.join(alert['alertRenderer']['text']['simpleText'] for alert in response['alerts']) }
+        elif 'errors' in response['responseContext']:
+            for error in response['responseContext']['errors']['error']:
+                if error['code'] == 'INVALID_VALUE' and error['location'] == 'browse_id':
+                    return {'error': 'This channel does not exist'}
+        return {'error': 'Failure getting microformat'}
+
+    info = {'error': None}
+    info['current_tab'] = tab
+
+
+    # stuff from microformat (info given by youtube for every page on channel)
+    info['short_description'] = microformat['description']
+    info['channel_name'] = microformat['title']
+    info['avatar'] = microformat['thumbnail']['thumbnails'][0]['url']
+    channel_url = microformat['urlCanonical'].rstrip('/')
+    channel_id = channel_url[channel_url.rfind('/')+1:]
+    info['channel_id'] = channel_id
+    info['channel_url'] = 'https://www.youtube.com/channel/' + channel_id
+
+    info['items'] = []
+
+    # empty channel
+    if 'contents' not in response and 'continuationContents' not in response:
+        return info
+
+
+    items, _ = extract_items(response)
+    if tab in ('videos', 'playlists', 'search'):
+        additional_info = {'author': info['channel_name'], 'author_url': 'https://www.youtube.com/channel/' + channel_id}
+        info['items'] = [extract_item_info(renderer, additional_info) for renderer in items]
+
+    elif tab == 'about':
+        for item in items:
+            try:
+                channel_metadata = item['channelAboutFullMetadataRenderer']
+                break
+            except KeyError:
+                pass
+        else:
+            info['error'] = 'Could not find channelAboutFullMetadataRenderer'
+            return info
+
+        info['links'] = []
+        for link_json in channel_metadata.get('primaryLinks', ()):
+            url = remove_redirect(link_json['navigationEndpoint']['urlEndpoint']['url'])
+
+            text = extract_str(link_json['title'])
+
+            info['links'].append( (text, url) )
+
+
+        info['stats'] = []
+        for stat_name in ('subscriberCountText', 'joinedDateText', 'viewCountText', 'country'):
+            try:
+                stat = channel_metadata[stat_name]
+            except KeyError:
+                continue
+            info['stats'].append(extract_str(stat))
+
+        if 'description' in channel_metadata:
+            info['description'] = extract_str(channel_metadata['description'])
+        else:
+            info['description'] = ''
+
+    else:
+        raise NotImplementedError('Unknown or unsupported channel tab: ' + tab)
+
+    return info
+
+def extract_search_info(polymer_json):
+    response, err = extract_response(polymer_json)
+    if err:
+        return {'error': err}
+    info = {'error': None}
+    info['estimated_results'] = int(response['estimatedResults'])
+    info['estimated_pages'] = ceil(info['estimated_results']/20)
+
+
+    results, _ = extract_items(response)
+
+
+    info['items'] = []
+    info['corrections'] = {'type': None}
+    for renderer in results:
+        type = list(renderer.keys())[0]
+        if type == 'shelfRenderer':
+            continue
+        if type == 'didYouMeanRenderer':
+            renderer = renderer[type]
+
+            info['corrections'] = {
+                'type': 'did_you_mean',
+                'corrected_query': renderer['correctedQueryEndpoint']['searchEndpoint']['query'],
+                'corrected_query_text': renderer['correctedQuery']['runs'],
+            }
+            continue
+        if type == 'showingResultsForRenderer':
+            renderer = renderer[type]
+
+            info['corrections'] = {
+                'type': 'showing_results_for',
+                'corrected_query_text': renderer['correctedQuery']['runs'],
+                'original_query_text': renderer['originalQuery']['simpleText'],
+            }
+            continue
+
+        i_info = extract_item_info(renderer)
+        if i_info.get('type') != 'unsupported':
+            info['items'].append(i_info)
+
+
+    return info
+
+def extract_playlist_metadata(polymer_json):
+    response, err = extract_response(polymer_json)
+    if err:
+        return {'error': err}
+
+    metadata = {'error': None}
+    header = deep_get(response, 'header', 'playlistHeaderRenderer', default={})
+    metadata['title'] = extract_str(header.get('title'))
+
+    metadata['first_video_id'] = deep_get(header, 'playEndpoint', 'watchEndpoint', 'videoId')
+    first_id = re.search(r'([a-z_\-]{11})', deep_get(header,
+        'thumbnail', 'thumbnails', 0, 'url', default=''))
+    if first_id:
+        conservative_update(metadata, 'first_video_id', first_id.group(1))
+    if metadata['first_video_id'] is None:
+        metadata['thumbnail'] = None
+    else:
+        metadata['thumbnail'] = 'https://i.ytimg.com/vi/' + metadata['first_video_id'] + '/mqdefault.jpg'
+
+    metadata['video_count'] = extract_int(header.get('numVideosText'))
+    metadata['description'] = extract_str(header.get('descriptionText'), default='')
+    metadata['author'] = extract_str(header.get('ownerText'))
+    metadata['author_id'] = multi_deep_get(header, 
+        ['ownerText', 'runs', 0, 'navigationEndpoint', 'browseEndpoint', 'browseId'],
+        ['ownerEndpoint', 'browseEndpoint', 'browseId'])
+    if metadata['author_id']:
+        metadata['author_url'] = 'https://www.youtube.com/channel/' + metadata['author_id']
+    else:
+        metadata['author_url'] = None
+    metadata['view_count'] = extract_int(header.get('viewCountText'))
+    metadata['like_count'] = extract_int(header.get('likesCountWithoutLikeText'))
+    for stat in header.get('stats', ()):
+        text = extract_str(stat)
+        if 'videos' in text:
+            conservative_update(metadata, 'video_count', extract_int(text))
+        elif 'views' in text:
+            conservative_update(metadata, 'view_count', extract_int(text))
+        elif 'updated' in text:
+            metadata['time_published'] = extract_date(text)
+
+    return metadata
+
+def extract_playlist_info(polymer_json):
+    response, err = extract_response(polymer_json)
+    if err:
+        return {'error': err}
+    info = {'error': None}
+    first_page = 'continuationContents' not in response
+    video_list, _ = extract_items(response)
+
+    info['items'] = [extract_item_info(renderer) for renderer in video_list]
+
+    if first_page:
+        info['metadata'] = extract_playlist_metadata(polymer_json)
+
+    return info
+
+def ctoken_metadata(ctoken):
+    result = dict()
+    params = proto.parse(proto.b64_to_bytes(ctoken))
+    result['video_id'] = proto.parse(params[2])[2].decode('ascii')
+
+    offset_information = proto.parse(params[6])
+    result['offset'] = offset_information.get(5, 0)
+
+    result['is_replies'] = False
+    if (3 in offset_information) and (2 in proto.parse(offset_information[3])):
+        result['is_replies'] = True
+        result['sort'] = None
+    else:
+        try:
+            result['sort'] = proto.parse(offset_information[4])[6]
+        except KeyError:
+            result['sort'] = 0
+    return result
+
+def extract_comments_info(polymer_json):
+    response, err = extract_response(polymer_json)
+    if err:
+        return {'error': err}
+    info = {'error': None}
+
+    url = multi_deep_get(polymer_json, [1, 'url'], ['url'])
+    if url:
+        ctoken = urllib.parse.parse_qs(url[url.find('?')+1:])['ctoken'][0]
+        metadata = ctoken_metadata(ctoken)
+    else:
+        metadata = {}
+    info['video_id'] = metadata.get('video_id')
+    info['offset'] = metadata.get('offset')
+    info['is_replies'] = metadata.get('is_replies')
+    info['sort'] = metadata.get('sort')
+    info['video_title'] = None
+
+    comments, ctoken = extract_items(response)
+    info['comments'] = []
+    info['ctoken'] = ctoken
+    for comment in comments:
+        comment_info = {}
+
+        if 'commentThreadRenderer' in comment:  # top level comments
+            conservative_update(info, 'is_replies', False)
+            comment_thread  = comment['commentThreadRenderer']
+            info['video_title'] = extract_str(comment_thread.get('commentTargetTitle'))
+            if 'replies' not in comment_thread:
+                comment_info['reply_count'] = 0
+            else:
+                comment_info['reply_count'] = extract_int(deep_get(comment_thread,
+                    'replies', 'commentRepliesRenderer', 'moreText'
+                ), default=1)   # With 1 reply, the text reads "View reply"
+            comment_renderer = deep_get(comment_thread, 'comment', 'commentRenderer', default={})
+        elif 'commentRenderer' in comment:  # replies
+            comment_info['reply_count'] = 0     # replyCount, below, not present for replies even if the reply has further replies to it
+            conservative_update(info, 'is_replies', True)
+            comment_renderer = comment['commentRenderer']
+        else:
+            comment_renderer = {}
+
+        # These 3 are sometimes absent, likely because the channel was deleted
+        comment_info['author'] = extract_str(comment_renderer.get('authorText'))
+        comment_info['author_url'] = deep_get(comment_renderer,
+            'authorEndpoint', 'commandMetadata', 'webCommandMetadata', 'url')
+        comment_info['author_id'] = deep_get(comment_renderer,
+            'authorEndpoint', 'browseEndpoint', 'browseId')
+
+        comment_info['author_avatar'] = deep_get(comment_renderer,
+            'authorThumbnail', 'thumbnails', 0, 'url')
+        comment_info['id'] = comment_renderer.get('commentId')
+        comment_info['text'] = extract_formatted_text(comment_renderer.get('contentText'))
+        comment_info['time_published'] = extract_str(comment_renderer.get('publishedTimeText'))
+        comment_info['like_count'] = comment_renderer.get('likeCount')
+        liberal_update(comment_info, 'reply_count', comment_renderer.get('replyCount'))
+
+        info['comments'].append(comment_info)
+
+    return info
diff --git a/youtube/yt_data_extract/watch_extraction.py b/youtube/yt_data_extract/watch_extraction.py
new file mode 100644
index 0000000..1166344
--- /dev/null
+++ b/youtube/yt_data_extract/watch_extraction.py
@@ -0,0 +1,449 @@
+from .common import (get, multi_get, deep_get, multi_deep_get,
+    liberal_update, conservative_update, remove_redirect, normalize_url,
+    extract_str, extract_formatted_text, extract_int, extract_approx_int,
+    extract_date, check_missing_keys, extract_item_info, extract_items,
+    extract_response)
+
+import json
+import urllib.parse
+import traceback
+
+# from https://github.com/ytdl-org/youtube-dl/blob/master/youtube_dl/extractor/youtube.py
+_formats = {
+    '5': {'ext': 'flv', 'width': 400, 'height': 240, 'acodec': 'mp3', 'audio_bitrate': 64, 'vcodec': 'h263'},
+    '6': {'ext': 'flv', 'width': 450, 'height': 270, 'acodec': 'mp3', 'audio_bitrate': 64, 'vcodec': 'h263'},
+    '13': {'ext': '3gp', 'acodec': 'aac', 'vcodec': 'mp4v'},
+    '17': {'ext': '3gp', 'width': 176, 'height': 144, 'acodec': 'aac', 'audio_bitrate': 24, 'vcodec': 'mp4v'},
+    '18': {'ext': 'mp4', 'width': 640, 'height': 360, 'acodec': 'aac', 'audio_bitrate': 96, 'vcodec': 'h264'},
+    '22': {'ext': 'mp4', 'width': 1280, 'height': 720, 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
+    '34': {'ext': 'flv', 'width': 640, 'height': 360, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+    '35': {'ext': 'flv', 'width': 854, 'height': 480, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+    # itag 36 videos are either 320x180 (BaW_jenozKc) or 320x240 (__2ABJjxzNo), audio_bitrate varies as well
+    '36': {'ext': '3gp', 'width': 320, 'acodec': 'aac', 'vcodec': 'mp4v'},
+    '37': {'ext': 'mp4', 'width': 1920, 'height': 1080, 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
+    '38': {'ext': 'mp4', 'width': 4096, 'height': 3072, 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
+    '43': {'ext': 'webm', 'width': 640, 'height': 360, 'acodec': 'vorbis', 'audio_bitrate': 128, 'vcodec': 'vp8'},
+    '44': {'ext': 'webm', 'width': 854, 'height': 480, 'acodec': 'vorbis', 'audio_bitrate': 128, 'vcodec': 'vp8'},
+    '45': {'ext': 'webm', 'width': 1280, 'height': 720, 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
+    '46': {'ext': 'webm', 'width': 1920, 'height': 1080, 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
+    '59': {'ext': 'mp4', 'width': 854, 'height': 480, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+    '78': {'ext': 'mp4', 'width': 854, 'height': 480, 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+
+
+    # 3D videos
+    '82': {'ext': 'mp4', 'height': 360, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+    '83': {'ext': 'mp4', 'height': 480, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+    '84': {'ext': 'mp4', 'height': 720, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
+    '85': {'ext': 'mp4', 'height': 1080, 'format_note': '3D', 'acodec': 'aac', 'audio_bitrate': 192, 'vcodec': 'h264'},
+    '100': {'ext': 'webm', 'height': 360, 'format_note': '3D', 'acodec': 'vorbis', 'audio_bitrate': 128, 'vcodec': 'vp8'},
+    '101': {'ext': 'webm', 'height': 480, 'format_note': '3D', 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
+    '102': {'ext': 'webm', 'height': 720, 'format_note': '3D', 'acodec': 'vorbis', 'audio_bitrate': 192, 'vcodec': 'vp8'},
+
+    # Apple HTTP Live Streaming
+    '91': {'ext': 'mp4', 'height': 144, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 48, 'vcodec': 'h264'},
+    '92': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 48, 'vcodec': 'h264'},
+    '93': {'ext': 'mp4', 'height': 360, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+    '94': {'ext': 'mp4', 'height': 480, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 128, 'vcodec': 'h264'},
+    '95': {'ext': 'mp4', 'height': 720, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 256, 'vcodec': 'h264'},
+    '96': {'ext': 'mp4', 'height': 1080, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 256, 'vcodec': 'h264'},
+    '132': {'ext': 'mp4', 'height': 240, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 48, 'vcodec': 'h264'},
+    '151': {'ext': 'mp4', 'height': 72, 'format_note': 'HLS', 'acodec': 'aac', 'audio_bitrate': 24, 'vcodec': 'h264'},
+
+    # DASH mp4 video
+    '133': {'ext': 'mp4', 'height': 240, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '134': {'ext': 'mp4', 'height': 360, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '135': {'ext': 'mp4', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '136': {'ext': 'mp4', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '137': {'ext': 'mp4', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '138': {'ext': 'mp4', 'format_note': 'DASH video', 'vcodec': 'h264'},  # Height can vary (https://github.com/ytdl-org/youtube-dl/issues/4559)
+    '160': {'ext': 'mp4', 'height': 144, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '212': {'ext': 'mp4', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '264': {'ext': 'mp4', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'h264'},
+    '298': {'ext': 'mp4', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'h264', 'fps': 60},
+    '299': {'ext': 'mp4', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'h264', 'fps': 60},
+    '266': {'ext': 'mp4', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'h264'},
+
+    # Dash mp4 audio
+    '139': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'audio_bitrate': 48, 'container': 'm4a_dash'},
+    '140': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'audio_bitrate': 128, 'container': 'm4a_dash'},
+    '141': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'audio_bitrate': 256, 'container': 'm4a_dash'},
+    '256': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'container': 'm4a_dash'},
+    '258': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'aac', 'container': 'm4a_dash'},
+    '325': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'dtse', 'container': 'm4a_dash'},
+    '328': {'ext': 'm4a', 'format_note': 'DASH audio', 'acodec': 'ec-3', 'container': 'm4a_dash'},
+
+    # Dash webm
+    '167': {'ext': 'webm', 'height': 360, 'width': 640, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+    '168': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+    '169': {'ext': 'webm', 'height': 720, 'width': 1280, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+    '170': {'ext': 'webm', 'height': 1080, 'width': 1920, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+    '218': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+    '219': {'ext': 'webm', 'height': 480, 'width': 854, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp8'},
+    '278': {'ext': 'webm', 'height': 144, 'format_note': 'DASH video', 'container': 'webm', 'vcodec': 'vp9'},
+    '242': {'ext': 'webm', 'height': 240, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '243': {'ext': 'webm', 'height': 360, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '244': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '245': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '246': {'ext': 'webm', 'height': 480, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '247': {'ext': 'webm', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '248': {'ext': 'webm', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '271': {'ext': 'webm', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    # itag 272 videos are either 3840x2160 (e.g. RtoitU2A-3E) or 7680x4320 (sLprVF6d7Ug)
+    '272': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '302': {'ext': 'webm', 'height': 720, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
+    '303': {'ext': 'webm', 'height': 1080, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
+    '308': {'ext': 'webm', 'height': 1440, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
+    '313': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9'},
+    '315': {'ext': 'webm', 'height': 2160, 'format_note': 'DASH video', 'vcodec': 'vp9', 'fps': 60},
+
+    # Dash webm audio
+    '171': {'ext': 'webm', 'acodec': 'vorbis', 'format_note': 'DASH audio', 'audio_bitrate': 128},
+    '172': {'ext': 'webm', 'acodec': 'vorbis', 'format_note': 'DASH audio', 'audio_bitrate': 256},
+
+    # Dash webm audio with opus inside
+    '249': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'audio_bitrate': 50},
+    '250': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'audio_bitrate': 70},
+    '251': {'ext': 'webm', 'format_note': 'DASH audio', 'acodec': 'opus', 'audio_bitrate': 160},
+
+    # RTMP (unnamed)
+    '_rtmp': {'protocol': 'rtmp'},
+
+    # av01 video only formats sometimes served with "unknown" codecs
+    '394': {'vcodec': 'av01.0.05M.08'},
+    '395': {'vcodec': 'av01.0.05M.08'},
+    '396': {'vcodec': 'av01.0.05M.08'},
+    '397': {'vcodec': 'av01.0.05M.08'},
+}
+
+def extract_metadata_row_info(video_renderer_info):
+    # extract category and music list
+    info = {
+        'category': None,
+        'music_list': [],
+    }
+
+    current_song = {}
+    for row in deep_get(video_renderer_info, 'metadataRowContainer', 'metadataRowContainerRenderer', 'rows', default=[]):
+        row_title = extract_str(deep_get(row, 'metadataRowRenderer', 'title'), default='')
+        row_content = extract_str(deep_get(row, 'metadataRowRenderer', 'contents', 0))
+        if row_title == 'Category':
+            info['category'] = row_content
+        elif row_title in ('Song', 'Music'):
+            if current_song:
+                info['music_list'].append(current_song)
+            current_song = {'title': row_content}
+        elif row_title == 'Artist':
+            current_song['artist'] = row_content
+        elif row_title == 'Album':
+            current_song['album'] = row_content
+        elif row_title == 'Writers':
+            current_song['writers'] = row_content
+        elif row_title.startswith('Licensed'):
+            current_song['licensor'] = row_content
+    if current_song:
+        info['music_list'].append(current_song)
+
+    return info
+
+def extract_watch_info_mobile(top_level):
+    info = {}
+    microformat = deep_get(top_level, 'playerResponse', 'microformat', 'playerMicroformatRenderer', default={})
+
+    family_safe = microformat.get('isFamilySafe')
+    if family_safe is None:
+        info['age_restricted'] = None
+    else:
+        info['age_restricted'] = not family_safe
+    info['allowed_countries'] = microformat.get('availableCountries', [])
+    info['time_published'] = microformat.get('publishDate')
+
+    response = top_level.get('response', {})
+
+    # video info from metadata renderers
+    items, _ = extract_items(response, item_types={'slimVideoMetadataRenderer'})
+    if items:
+        video_info = items[0]['slimVideoMetadataRenderer']
+    else:
+        print('Failed to extract video metadata')
+        video_info = {}
+
+    info.update(extract_metadata_row_info(video_info))
+    info['description'] = extract_str(video_info.get('description'), recover_urls=True)
+    info['view_count'] = extract_int(extract_str(video_info.get('expandedSubtitle')))
+    info['author'] = extract_str(deep_get(video_info, 'owner', 'slimOwnerRenderer', 'title'))
+    info['author_id'] = deep_get(video_info, 'owner', 'slimOwnerRenderer', 'navigationEndpoint', 'browseEndpoint', 'browseId')
+    info['title'] = extract_str(video_info.get('title'))
+    info['live'] = 'watching' in extract_str(video_info.get('expandedSubtitle'), default='')
+    info['unlisted'] = False
+    for badge in video_info.get('badges', []):
+        if deep_get(badge, 'metadataBadgeRenderer', 'label') == 'Unlisted':
+            info['unlisted'] = True
+    info['like_count'] = None
+    info['dislike_count'] = None
+    if not info['time_published']:
+        info['time_published'] = extract_date(extract_str(video_info.get('dateText', None)))
+    for button in video_info.get('buttons', ()):
+        button_renderer = button.get('slimMetadataToggleButtonRenderer', {})
+
+        # all the digits can be found in the accessibility data
+        count = extract_int(deep_get(button_renderer, 'button', 'toggleButtonRenderer', 'defaultText', 'accessibility', 'accessibilityData', 'label'))
+
+        # this count doesn't have all the digits, it's like 53K for instance
+        dumb_count = extract_int(extract_str(deep_get(button_renderer, 'button', 'toggleButtonRenderer', 'defaultText')))
+
+        # the accessibility text will be "No likes" or "No dislikes" or something like that, but dumb count will be 0
+        if dumb_count == 0:
+            count = 0
+
+        if 'isLike' in button_renderer:
+            info['like_count'] = count
+        elif 'isDislike' in button_renderer:
+            info['dislike_count'] = count
+
+    # comment section info
+    items, _ = extract_items(response, item_types={'commentSectionRenderer'})
+    if items:
+        comment_info = items[0]['commentSectionRenderer']
+        comment_count_text = extract_str(deep_get(comment_info, 'header', 'commentSectionHeaderRenderer', 'countText'))
+        if comment_count_text == 'Comments':    # just this with no number, means 0 comments
+            info['comment_count'] = 0
+        else:
+            info['comment_count'] = extract_int(comment_count_text)
+        info['comments_disabled'] = False
+    else:   # no comment section present means comments are disabled
+        info['comment_count'] = 0
+        info['comments_disabled'] = True
+
+    # check for limited state
+    items, _ = extract_items(response, item_types={'limitedStateMessageRenderer'})
+    if items:
+        info['limited_state'] = True
+    else:
+        info['limited_state'] = False
+
+    # related videos
+    related, _ = extract_items(response)
+    info['related_videos'] = [extract_item_info(renderer) for renderer in related]
+
+    return info
+
+month_abbreviations = {'jan':'1', 'feb':'2', 'mar':'3', 'apr':'4', 'may':'5', 'jun':'6', 'jul':'7', 'aug':'8', 'sep':'9', 'oct':'10', 'nov':'11', 'dec':'12'}
+def extract_watch_info_desktop(top_level):
+    info = {
+        'comment_count': None,
+        'comments_disabled': None,
+        'allowed_countries': None,
+        'limited_state': None,
+    }
+
+    video_info = {}
+    for renderer in deep_get(top_level, 'response', 'contents', 'twoColumnWatchNextResults', 'results', 'results', 'contents', default=()):
+        if renderer and list(renderer.keys())[0] in ('videoPrimaryInfoRenderer', 'videoSecondaryInfoRenderer'):
+            video_info.update(list(renderer.values())[0])
+
+    info.update(extract_metadata_row_info(video_info))
+    info['description'] = extract_str(video_info.get('description', None), recover_urls=True)
+    info['time_published'] = extract_date(extract_str(video_info.get('dateText', None)))
+
+    likes_dislikes = deep_get(video_info, 'sentimentBar', 'sentimentBarRenderer', 'tooltip', default='').split('/')
+    if len(likes_dislikes) == 2:
+        info['like_count'] = extract_int(likes_dislikes[0])
+        info['dislike_count'] = extract_int(likes_dislikes[1])
+    else:
+        info['like_count'] = None
+        info['dislike_count'] = None
+
+    info['title'] = extract_str(video_info.get('title', None))
+    info['author'] = extract_str(deep_get(video_info, 'owner', 'videoOwnerRenderer', 'title'))
+    info['author_id'] = deep_get(video_info, 'owner', 'videoOwnerRenderer', 'navigationEndpoint', 'browseEndpoint', 'browseId')
+    info['view_count'] = extract_int(extract_str(deep_get(video_info, 'viewCount', 'videoViewCountRenderer', 'viewCount')))
+
+    related = deep_get(top_level, 'response', 'contents', 'twoColumnWatchNextResults', 'secondaryResults', 'secondaryResults', 'results', default=[])
+    info['related_videos'] = [extract_item_info(renderer) for renderer in related]
+
+    return info
+
+def get_caption_url(info, language, format, automatic=False, translation_language=None):
+    '''Gets the url for captions with the given language and format. If automatic is True, get the automatic captions for that language. If translation_language is given, translate the captions from `language` to `translation_language`. If automatic is true and translation_language is given, the automatic captions will be translated.'''
+    url = info['_captions_base_url']
+    url += '&lang=' + language
+    url += '&fmt=' + format
+    if automatic:
+        url += '&kind=asr'
+    elif language in info['_manual_caption_language_names']:
+        url += '&name=' + urllib.parse.quote(info['_manual_caption_language_names'][language], safe='')
+
+    if translation_language:
+        url += '&tlang=' + translation_language
+    return url
+
+def extract_formats(info, player_response):
+    streaming_data = player_response.get('streamingData', {})
+    yt_formats = streaming_data.get('formats', []) + streaming_data.get('adaptiveFormats', [])
+
+    info['formats'] = []
+
+    for yt_fmt in yt_formats:
+        fmt = {}
+        fmt['ext'] = None
+        fmt['audio_bitrate'] = None
+        fmt['acodec'] = None
+        fmt['vcodec'] = None
+        fmt['width'] = yt_fmt.get('width')
+        fmt['height'] = yt_fmt.get('height')
+        fmt['file_size'] = yt_fmt.get('contentLength')
+        fmt['audio_sample_rate'] = yt_fmt.get('audioSampleRate')
+        fmt['fps'] = yt_fmt.get('fps')
+        cipher = dict(urllib.parse.parse_qsl(yt_fmt.get('cipher', '')))
+        if cipher:
+            fmt['url'] = cipher.get('url')
+        else:
+            fmt['url'] = yt_fmt.get('url')
+        fmt['s'] = cipher.get('s')
+        fmt['sp'] = cipher.get('sp')
+        fmt.update(_formats.get(str(yt_fmt.get('itag')), {}))
+
+        info['formats'].append(fmt)
+
+def extract_playability_error(info, player_response, error_prefix=''):
+    if info['formats']:
+        info['playability_status'] = None
+        info['playability_error'] = None
+        return
+
+    playability_status = deep_get(player_response, 'playabilityStatus', 'status', default=None)
+    info['playability_status'] = playability_status
+
+    playability_reason = extract_str(multi_deep_get(player_response,
+        ['playabilityStatus', 'reason'],
+        ['playabilityStatus', 'errorScreen', 'playerErrorMessageRenderer', 'reason'],
+        default='Could not find playability error')
+    )
+
+    if playability_status not in (None, 'OK'):
+        info['playability_error'] = error_prefix + playability_reason
+    else:
+        info['playability_error'] = error_prefix + 'Unknown playability error'
+
+SUBTITLE_FORMATS = ('srv1', 'srv2', 'srv3', 'ttml', 'vtt')
+def extract_watch_info(polymer_json):
+    info = {'playability_error': None, 'error': None}
+
+    if isinstance(polymer_json, dict):
+        top_level = polymer_json
+    elif isinstance(polymer_json, (list, tuple)):
+        top_level = {}
+        for page_part in polymer_json:
+            if not isinstance(page_part, dict):
+                return {'error': 'Invalid page part'}
+            top_level.update(page_part)
+    else:
+        return {'error': 'Invalid top level polymer data'}
+
+    error = check_missing_keys(top_level,
+        ['player', 'args'],
+        ['player', 'assets', 'js'],
+        ['playerResponse'],
+    )
+    if error:
+        info['playability_error'] = error
+
+    player_args = deep_get(top_level, 'player', 'args', default={})
+    player_response = json.loads(player_args['player_response']) if 'player_response' in player_args else {}
+
+    # captions
+    info['automatic_caption_languages'] = []
+    info['manual_caption_languages'] = []
+    info['_manual_caption_language_names'] = {}     # language name written in that language, needed in some cases to create the url
+    info['translation_languages'] = []
+    captions_info = player_response.get('captions', {})
+    info['_captions_base_url'] = normalize_url(deep_get(captions_info, 'playerCaptionsRenderer', 'baseUrl'))
+    for caption_track in deep_get(captions_info, 'playerCaptionsTracklistRenderer', 'captionTracks', default=()):
+        lang_code = caption_track.get('languageCode')
+        if not lang_code:
+            continue
+        if caption_track.get('kind') == 'asr':
+            info['automatic_caption_languages'].append(lang_code)
+        else:
+            info['manual_caption_languages'].append(lang_code)
+        base_url = caption_track.get('baseUrl', '')
+        lang_name = deep_get(urllib.parse.parse_qs(urllib.parse.urlparse(base_url).query), 'name', 0)
+        if lang_name:
+            info['_manual_caption_language_names'][lang_code] = lang_name
+
+    for translation_lang_info in deep_get(captions_info, 'playerCaptionsTracklistRenderer', 'translationLanguages', default=()):
+        lang_code = translation_lang_info.get('languageCode')
+        if lang_code:
+            info['translation_languages'].append(lang_code)
+        if translation_lang_info.get('isTranslatable') == False:
+            print('WARNING: Found non-translatable caption language')
+
+    # formats
+    extract_formats(info, player_response)
+
+    # playability errors
+    extract_playability_error(info, player_response)
+
+    # check age-restriction
+    info['age_restricted'] = (info['playability_status'] == 'LOGIN_REQUIRED' and info['playability_error'] and ' age' in info['playability_error'])
+
+    # base_js (for decryption of signatures)
+    info['base_js'] = deep_get(top_level, 'player', 'assets', 'js')
+    if info['base_js']:
+        info['base_js'] = normalize_url(info['base_js'])
+
+    mobile = 'singleColumnWatchNextResults' in deep_get(top_level, 'response', 'contents', default={})
+    if mobile:
+        info.update(extract_watch_info_mobile(top_level))
+    else:
+        info.update(extract_watch_info_desktop(top_level))
+
+    # stuff from videoDetails. Use liberal_update to prioritize info from videoDetails over existing info
+    vd = deep_get(top_level, 'playerResponse', 'videoDetails', default={})
+    liberal_update(info, 'title',      extract_str(vd.get('title')))
+    liberal_update(info, 'duration',   extract_int(vd.get('lengthSeconds')))
+    liberal_update(info, 'view_count', extract_int(vd.get('viewCount')))
+    # videos with no description have a blank string
+    liberal_update(info, 'description', vd.get('shortDescription'))
+    liberal_update(info, 'id',          vd.get('videoId'))
+    liberal_update(info, 'author',      vd.get('author'))
+    liberal_update(info, 'author_id',   vd.get('channelId'))
+    liberal_update(info, 'live',        vd.get('isLiveContent'))
+    conservative_update(info, 'unlisted', not vd.get('isCrawlable', True))  #isCrawlable is false on limited state videos even if they aren't unlisted
+    liberal_update(info, 'tags',        vd.get('keywords', []))
+
+    # fallback stuff from microformat
+    mf = deep_get(top_level, 'playerResponse', 'microformat', 'playerMicroformatRenderer', default={})
+    conservative_update(info, 'title',      extract_str(mf.get('title')))
+    conservative_update(info, 'duration', extract_int(mf.get('lengthSeconds')))
+    # this gives the view count for limited state videos
+    conservative_update(info, 'view_count', extract_int(mf.get('viewCount')))
+    conservative_update(info, 'description', extract_str(mf.get('description'), recover_urls=True))
+    conservative_update(info, 'author', mf.get('ownerChannelName'))
+    conservative_update(info, 'author_id', mf.get('externalChannelId'))
+    liberal_update(info, 'unlisted', mf.get('isUnlisted'))
+    liberal_update(info, 'category', mf.get('category'))
+    liberal_update(info, 'time_published', mf.get('publishDate'))
+    liberal_update(info, 'time_uploaded', mf.get('uploadDate'))
+
+    # other stuff
+    info['author_url'] = 'https://www.youtube.com/channel/' + info['author_id'] if info['author_id'] else None
+    return info
+
+def update_with_age_restricted_info(info, video_info_page):
+    ERROR_PREFIX = 'Error bypassing age-restriction: '
+
+    video_info = urllib.parse.parse_qs(video_info_page)
+    player_response = deep_get(video_info, 'player_response', 0)
+    if player_response is None:
+        info['playability_error'] = ERROR_PREFIX + 'Could not find player_response in video_info_page'
+        return
+    try:
+        player_response = json.loads(player_response)
+    except json.decoder.JSONDecodeError:
+        traceback.print_exc()
+        info['playability_error'] = ERROR_PREFIX + 'Failed to parse json response'
+        return
+
+    extract_formats(info, player_response)
+    extract_playability_error(info, player_response, error_prefix=ERROR_PREFIX)