Merge branch 'modular-data-extract'

Commits in this branch are prefixed with "Extraction:"
This branch refactors data extraction. All such functionality has been moved to the yt_data_extract module.
Responses from requests are given to the module and it parses them into a consistent, more useful format.
The dependency on youtube-dl has also been dropped and this functionality has been built from scratch for these reasons:
(1) I've noticed youtube-dl breaks more often than invidious (which uses watch page extraction built from scratch) in response to changes from Youtube, so I'm hoping what I wrote will also be less brittle.
(2) Such breakage is inconvenient because I have to manually merge the fixes since I had to make changes to youtube-dl to make it do things such as extracting related videos.
(3) I have no control over error handling and request pooling with youtube-dl, since it does all the requests (these would require intrusive changes I don't want to maintain).
(4) I will now be able to finally display the number of comments and whether comments are disabled without making additional requests.

1 files changed, 0 insertions, 2862 deletions

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
deleted file mode 100644
index 5d4db54..0000000
--- a/youtube_dl/extractor/common.py
+++ /dev/null
@@ -1,2862 +0,0 @@
-# coding: utf-8
-from __future__ import unicode_literals
-
-import base64
-import datetime
-import hashlib
-import json
-import netrc
-import os
-import random
-import re
-import socket
-import sys
-import time
-import math
-
-from ..compat import (
-    compat_cookiejar,
-    compat_cookies,
-    compat_etree_fromstring,
-    compat_getpass,
-    compat_integer_types,
-    compat_http_client,
-    compat_os_name,
-    compat_str,
-    compat_urllib_error,
-    compat_urllib_parse_unquote,
-    compat_urllib_parse_urlencode,
-    compat_urllib_request,
-    compat_urlparse,
-    compat_xml_parse_error,
-)
-from ..downloader.f4m import (
-    get_base_url,
-    remove_encrypted_media,
-)
-from ..utils import (
-    NO_DEFAULT,
-    age_restricted,
-    base_url,
-    bug_reports_message,
-    clean_html,
-    compiled_regex_type,
-    determine_ext,
-    determine_protocol,
-    error_to_compat_str,
-    ExtractorError,
-    extract_attributes,
-    fix_xml_ampersands,
-    float_or_none,
-    GeoRestrictedError,
-    GeoUtils,
-    int_or_none,
-    js_to_json,
-    JSON_LD_RE,
-    mimetype2ext,
-    orderedSet,
-    parse_codecs,
-    parse_duration,
-    parse_iso8601,
-    parse_m3u8_attributes,
-    RegexNotFoundError,
-    sanitized_Request,
-    sanitize_filename,
-    unescapeHTML,
-    unified_strdate,
-    unified_timestamp,
-    update_Request,
-    update_url_query,
-    urljoin,
-    url_basename,
-    xpath_element,
-    xpath_text,
-    xpath_with_ns,
-)
-
-
-class InfoExtractor(object):
-    """Information Extractor class.
-
-    Information extractors are the classes that, given a URL, extract
-    information about the video (or videos) the URL refers to. This
-    information includes the real video URL, the video title, author and
-    others. The information is stored in a dictionary which is then
-    passed to the YoutubeDL. The YoutubeDL processes this
-    information possibly downloading the video to the file system, among
-    other possible outcomes.
-
-    The type field determines the type of the result.
-    By far the most common value (and the default if _type is missing) is
-    "video", which indicates a single video.
-
-    For a video, the dictionaries must include the following fields:
-
-    id:             Video identifier.
-    title:          Video title, unescaped.
-
-    Additionally, it must contain either a formats entry or a url one:
-
-    formats:        A list of dictionaries for each format available, ordered
-                    from worst to best quality.
-
-                    Potential fields:
-                    * url        Mandatory. The URL of the video file
-                    * manifest_url
-                                 The URL of the manifest file in case of
-                                 fragmented media (DASH, hls, hds)
-                    * ext        Will be calculated from URL if missing
-                    * format     A human-readable description of the format
-                                 ("mp4 container with h264/opus").
-                                 Calculated from the format_id, width, height.
-                                 and format_note fields if missing.
-                    * format_id  A short description of the format
-                                 ("mp4_h264_opus" or "19").
-                                Technically optional, but strongly recommended.
-                    * format_note Additional info about the format
-                                 ("3D" or "DASH video")
-                    * width      Width of the video, if known
-                    * height     Height of the video, if known
-                    * resolution Textual description of width and height
-                    * tbr        Average bitrate of audio and video in KBit/s
-                    * abr        Average audio bitrate in KBit/s
-                    * acodec     Name of the audio codec in use
-                    * asr        Audio sampling rate in Hertz
-                    * vbr        Average video bitrate in KBit/s
-                    * fps        Frame rate
-                    * vcodec     Name of the video codec in use
-                    * container  Name of the container format
-                    * filesize   The number of bytes, if known in advance
-                    * filesize_approx  An estimate for the number of bytes
-                    * player_url SWF Player URL (used for rtmpdump).
-                    * protocol   The protocol that will be used for the actual
-                                 download, lower-case.
-                                 "http", "https", "rtsp", "rtmp", "rtmpe",
-                                 "m3u8", "m3u8_native" or "http_dash_segments".
-                    * fragment_base_url
-                                 Base URL for fragments. Each fragment's path
-                                 value (if present) will be relative to
-                                 this URL.
-                    * fragments  A list of fragments of a fragmented media.
-                                 Each fragment entry must contain either an url
-                                 or a path. If an url is present it should be
-                                 considered by a client. Otherwise both path and
-                                 fragment_base_url must be present. Here is
-                                 the list of all potential fields:
-                                 * "url" - fragment's URL
-                                 * "path" - fragment's path relative to
-                                            fragment_base_url
-                                 * "duration" (optional, int or float)
-                                 * "filesize" (optional, int)
-                    * preference Order number of this format. If this field is
-                                 present and not None, the formats get sorted
-                                 by this field, regardless of all other values.
-                                 -1 for default (order by other properties),
-                                 -2 or smaller for less than default.
-                                 < -1000 to hide the format (if there is
-                                    another one which is strictly better)
-                    * language   Language code, e.g. "de" or "en-US".
-                    * language_preference  Is this in the language mentioned in
-                                 the URL?
-                                 10 if it's what the URL is about,
-                                 -1 for default (don't know),
-                                 -10 otherwise, other values reserved for now.
-                    * quality    Order number of the video quality of this
-                                 format, irrespective of the file format.
-                                 -1 for default (order by other properties),
-                                 -2 or smaller for less than default.
-                    * source_preference  Order number for this video source
-                                  (quality takes higher priority)
-                                 -1 for default (order by other properties),
-                                 -2 or smaller for less than default.
-                    * http_headers  A dictionary of additional HTTP headers
-                                 to add to the request.
-                    * stretched_ratio  If given and not 1, indicates that the
-                                 video's pixels are not square.
-                                 width : height ratio as float.
-                    * no_resume  The server does not support resuming the
-                                 (HTTP or RTMP) download. Boolean.
-                    * downloader_options  A dictionary of downloader options as
-                                 described in FileDownloader
-
-    url:            Final video URL.
-    ext:            Video filename extension.
-    format:         The video format, defaults to ext (used for --get-format)
-    player_url:     SWF Player URL (used for rtmpdump).
-
-    The following fields are optional:
-
-    alt_title:      A secondary title of the video.
-    display_id      An alternative identifier for the video, not necessarily
-                    unique, but available before title. Typically, id is
-                    something like "4234987", title "Dancing naked mole rats",
-                    and display_id "dancing-naked-mole-rats"
-    thumbnails:     A list of dictionaries, with the following entries:
-                        * "id" (optional, string) - Thumbnail format ID
-                        * "url"
-                        * "preference" (optional, int) - quality of the image
-                        * "width" (optional, int)
-                        * "height" (optional, int)
-                        * "resolution" (optional, string "{width}x{height"},
-                                        deprecated)
-                        * "filesize" (optional, int)
-    thumbnail:      Full URL to a video thumbnail image.
-    description:    Full video description.
-    uploader:       Full name of the video uploader.
-    license:        License name the video is licensed under.
-    creator:        The creator of the video.
-    release_date:   The date (YYYYMMDD) when the video was released.
-    timestamp:      UNIX timestamp of the moment the video became available.
-    upload_date:    Video upload date (YYYYMMDD).
-                    If not explicitly set, calculated from timestamp.
-    uploader_id:    Nickname or id of the video uploader.
-    uploader_url:   Full URL to a personal webpage of the video uploader.
-    location:       Physical location where the video was filmed.
-    subtitles:      The available subtitles as a dictionary in the format
-                    {tag: subformats}. "tag" is usually a language code, and
-                    "subformats" is a list sorted from lower to higher
-                    preference, each element is a dictionary with the "ext"
-                    entry and one of:
-                        * "data": The subtitles file contents
-                        * "url": A URL pointing to the subtitles file
-                    "ext" will be calculated from URL if missing
-    automatic_captions: Like 'subtitles', used by the YoutubeIE for
-                    automatically generated captions
-    duration:       Length of the video in seconds, as an integer or float.
-    view_count:     How many users have watched the video on the platform.
-    like_count:     Number of positive ratings of the video
-    dislike_count:  Number of negative ratings of the video
-    repost_count:   Number of reposts of the video
-    average_rating: Average rating give by users, the scale used depends on the webpage
-    comment_count:  Number of comments on the video
-    comments:       A list of comments, each with one or more of the following
-                    properties (all but one of text or html optional):
-                        * "author" - human-readable name of the comment author
-                        * "author_id" - user ID of the comment author
-                        * "id" - Comment ID
-                        * "html" - Comment as HTML
-                        * "text" - Plain text of the comment
-                        * "timestamp" - UNIX timestamp of comment
-                        * "parent" - ID of the comment this one is replying to.
-                                     Set to "root" to indicate that this is a
-                                     comment to the original video.
-    age_limit:      Age restriction for the video, as an integer (years)
-    webpage_url:    The URL to the video webpage, if given to youtube-dl it
-                    should allow to get the same result again. (It will be set
-                    by YoutubeDL if it's missing)
-    categories:     A list of categories that the video falls in, for example
-                    ["Sports", "Berlin"]
-    tags:           A list of tags assigned to the video, e.g. ["sweden", "pop music"]
-    is_live:        True, False, or None (=unknown). Whether this video is a
-                    live stream that goes on instead of a fixed-length video.
-    start_time:     Time in seconds where the reproduction should start, as
-                    specified in the URL.
-    end_time:       Time in seconds where the reproduction should end, as
-                    specified in the URL.
-    chapters:       A list of dictionaries, with the following entries:
-                        * "start_time" - The start time of the chapter in seconds
-                        * "end_time" - The end time of the chapter in seconds
-                        * "title" (optional, string)
-
-    The following fields should only be used when the video belongs to some logical
-    chapter or section:
-
-    chapter:        Name or title of the chapter the video belongs to.
-    chapter_number: Number of the chapter the video belongs to, as an integer.
-    chapter_id:     Id of the chapter the video belongs to, as a unicode string.
-
-    The following fields should only be used when the video is an episode of some
-    series, programme or podcast:
-
-    series:         Title of the series or programme the video episode belongs to.
-    season:         Title of the season the video episode belongs to.
-    season_number:  Number of the season the video episode belongs to, as an integer.
-    season_id:      Id of the season the video episode belongs to, as a unicode string.
-    episode:        Title of the video episode. Unlike mandatory video title field,
-                    this field should denote the exact title of the video episode
-                    without any kind of decoration.
-    episode_number: Number of the video episode within a season, as an integer.
-    episode_id:     Id of the video episode, as a unicode string.
-
-    The following fields should only be used when the media is a track or a part of
-    a music album:
-
-    track:          Title of the track.
-    track_number:   Number of the track within an album or a disc, as an integer.
-    track_id:       Id of the track (useful in case of custom indexing, e.g. 6.iii),
-                    as a unicode string.
-    artist:         Artist(s) of the track.
-    genre:          Genre(s) of the track.
-    album:          Title of the album the track belongs to.
-    album_type:     Type of the album (e.g. "Demo", "Full-length", "Split", "Compilation", etc).
-    album_artist:   List of all artists appeared on the album (e.g.
-                    "Ash Borer / Fell Voices" or "Various Artists", useful for splits
-                    and compilations).
-    disc_number:    Number of the disc or other physical medium the track belongs to,
-                    as an integer.
-    release_year:   Year (YYYY) when the album was released.
-
-    Unless mentioned otherwise, the fields should be Unicode strings.
-
-    Unless mentioned otherwise, None is equivalent to absence of information.
-
-
-    _type "playlist" indicates multiple videos.
-    There must be a key "entries", which is a list, an iterable, or a PagedList
-    object, each element of which is a valid dictionary by this specification.
-
-    Additionally, playlists can have "id", "title", "description", "uploader",
-    "uploader_id", "uploader_url" attributes with the same semantics as videos
-    (see above).
-
-
-    _type "multi_video" indicates that there are multiple videos that
-    form a single show, for examples multiple acts of an opera or TV episode.
-    It must have an entries key like a playlist and contain all the keys
-    required for a video at the same time.
-
-
-    _type "url" indicates that the video must be extracted from another
-    location, possibly by a different extractor. Its only required key is:
-    "url" - the next URL to extract.
-    The key "ie_key" can be set to the class name (minus the trailing "IE",
-    e.g. "Youtube") if the extractor class is known in advance.
-    Additionally, the dictionary may have any properties of the resolved entity
-    known in advance, for example "title" if the title of the referred video is
-    known ahead of time.
-
-
-    _type "url_transparent" entities have the same specification as "url", but
-    indicate that the given additional information is more precise than the one
-    associated with the resolved URL.
-    This is useful when a site employs a video service that hosts the video and
-    its technical metadata, but that video service does not embed a useful
-    title, description etc.
-
-
-    Subclasses of this one should re-define the _real_initialize() and
-    _real_extract() methods and define a _VALID_URL regexp.
-    Probably, they should also be added to the list of extractors.
-
-    _GEO_BYPASS attribute may be set to False in order to disable
-    geo restriction bypass mechanisms for a particular extractor.
-    Though it won't disable explicit geo restriction bypass based on
-    country code provided with geo_bypass_country.
-
-    _GEO_COUNTRIES attribute may contain a list of presumably geo unrestricted
-    countries for this extractor. One of these countries will be used by
-    geo restriction bypass mechanism right away in order to bypass
-    geo restriction, of course, if the mechanism is not disabled.
-
-    _GEO_IP_BLOCKS attribute may contain a list of presumably geo unrestricted
-    IP blocks in CIDR notation for this extractor. One of these IP blocks
-    will be used by geo restriction bypass mechanism similarly
-    to _GEO_COUNTRIES.
-
-    Finally, the _WORKING attribute should be set to False for broken IEs
-    in order to warn the users and skip the tests.
-    """
-
-    _ready = False
-    _downloader = None
-    _x_forwarded_for_ip = None
-    _GEO_BYPASS = True
-    _GEO_COUNTRIES = None
-    _GEO_IP_BLOCKS = None
-    _WORKING = True
-
-    def __init__(self, downloader=None):
-        """Constructor. Receives an optional downloader."""
-        self._ready = False
-        self._x_forwarded_for_ip = None
-        self.set_downloader(downloader)
-
-    @classmethod
-    def suitable(cls, url):
-        """Receives a URL and returns True if suitable for this IE."""
-
-        # This does not use has/getattr intentionally - we want to know whether
-        # we have cached the regexp for *this* class, whereas getattr would also
-        # match the superclass
-        if '_VALID_URL_RE' not in cls.__dict__:
-            cls._VALID_URL_RE = re.compile(cls._VALID_URL)
-        return cls._VALID_URL_RE.match(url) is not None
-
-    @classmethod
-    def _match_id(cls, url):
-        if '_VALID_URL_RE' not in cls.__dict__:
-            cls._VALID_URL_RE = re.compile(cls._VALID_URL)
-        m = cls._VALID_URL_RE.match(url)
-        assert m
-        return compat_str(m.group('id'))
-
-    @classmethod
-    def working(cls):
-        """Getter method for _WORKING."""
-        return cls._WORKING
-
-    def initialize(self):
-        """Initializes an instance (authentication, etc)."""
-        self._initialize_geo_bypass({
-            'countries': self._GEO_COUNTRIES,
-            'ip_blocks': self._GEO_IP_BLOCKS,
-        })
-        if not self._ready:
-            self._real_initialize()
-            self._ready = True
-
-    def _initialize_geo_bypass(self, geo_bypass_context):
-        """
-        Initialize geo restriction bypass mechanism.
-
-        This method is used to initialize geo bypass mechanism based on faking
-        X-Forwarded-For HTTP header. A random country from provided country list
-        is selected and a random IP belonging to this country is generated. This
-        IP will be passed as X-Forwarded-For HTTP header in all subsequent
-        HTTP requests.
-
-        This method will be used for initial geo bypass mechanism initialization
-        during the instance initialization with _GEO_COUNTRIES and
-        _GEO_IP_BLOCKS.
-
-        You may also manually call it from extractor's code if geo bypass
-        information is not available beforehand (e.g. obtained during
-        extraction) or due to some other reason. In this case you should pass
-        this information in geo bypass context passed as first argument. It may
-        contain following fields:
-
-        countries:  List of geo unrestricted countries (similar
-                    to _GEO_COUNTRIES)
-        ip_blocks:  List of geo unrestricted IP blocks in CIDR notation
-                    (similar to _GEO_IP_BLOCKS)
-
-        """
-        if not self._x_forwarded_for_ip:
-
-            # Geo bypass mechanism is explicitly disabled by user
-            if not self._downloader.params.get('geo_bypass', True):
-                return
-
-            if not geo_bypass_context:
-                geo_bypass_context = {}
-
-            # Backward compatibility: previously _initialize_geo_bypass
-            # expected a list of countries, some 3rd party code may still use
-            # it this way
-            if isinstance(geo_bypass_context, (list, tuple)):
-                geo_bypass_context = {
-                    'countries': geo_bypass_context,
-                }
-
-            # The whole point of geo bypass mechanism is to fake IP
-            # as X-Forwarded-For HTTP header based on some IP block or
-            # country code.
-
-            # Path 1: bypassing based on IP block in CIDR notation
-
-            # Explicit IP block specified by user, use it right away
-            # regardless of whether extractor is geo bypassable or not
-            ip_block = self._downloader.params.get('geo_bypass_ip_block', None)
-
-            # Otherwise use random IP block from geo bypass context but only
-            # if extractor is known as geo bypassable
-            if not ip_block:
-                ip_blocks = geo_bypass_context.get('ip_blocks')
-                if self._GEO_BYPASS and ip_blocks:
-                    ip_block = random.choice(ip_blocks)
-
-            if ip_block:
-                self._x_forwarded_for_ip = GeoUtils.random_ipv4(ip_block)
-                if self._downloader.params.get('verbose', False):
-                    self._downloader.to_screen(
-                        '[debug] Using fake IP %s as X-Forwarded-For.'
-                        % self._x_forwarded_for_ip)
-                return
-
-            # Path 2: bypassing based on country code
-
-            # Explicit country code specified by user, use it right away
-            # regardless of whether extractor is geo bypassable or not
-            country = self._downloader.params.get('geo_bypass_country', None)
-
-            # Otherwise use random country code from geo bypass context but
-            # only if extractor is known as geo bypassable
-            if not country:
-                countries = geo_bypass_context.get('countries')
-                if self._GEO_BYPASS and countries:
-                    country = random.choice(countries)
-
-            if country:
-                self._x_forwarded_for_ip = GeoUtils.random_ipv4(country)
-                if self._downloader.params.get('verbose', False):
-                    self._downloader.to_screen(
-                        '[debug] Using fake IP %s (%s) as X-Forwarded-For.'
-                        % (self._x_forwarded_for_ip, country.upper()))
-
-    def extract(self, url):
-        """Extracts URL information and returns it in list of dicts."""
-        try:
-            for _ in range(2):
-                try:
-                    self.initialize()
-                    ie_result = self._real_extract(url)
-                    if self._x_forwarded_for_ip:
-                        ie_result['__x_forwarded_for_ip'] = self._x_forwarded_for_ip
-                    return ie_result
-                except GeoRestrictedError as e:
-                    if self.__maybe_fake_ip_and_retry(e.countries):
-                        continue
-                    raise
-        except ExtractorError:
-            raise
-        except compat_http_client.IncompleteRead as e:
-            raise ExtractorError('A network error has occurred.', cause=e, expected=True)
-        except (KeyError, StopIteration) as e:
-            raise ExtractorError('An extractor error has occurred.', cause=e)
-
-    def __maybe_fake_ip_and_retry(self, countries):
-        if (not self._downloader.params.get('geo_bypass_country', None) and
-                self._GEO_BYPASS and
-                self._downloader.params.get('geo_bypass', True) and
-                not self._x_forwarded_for_ip and
-                countries):
-            country_code = random.choice(countries)
-            self._x_forwarded_for_ip = GeoUtils.random_ipv4(country_code)
-            if self._x_forwarded_for_ip:
-                self.report_warning(
-                    'Video is geo restricted. Retrying extraction with fake IP %s (%s) as X-Forwarded-For.'
-                    % (self._x_forwarded_for_ip, country_code.upper()))
-                return True
-        return False
-
-    def set_downloader(self, downloader):
-        """Sets the downloader for this IE."""
-        self._downloader = downloader
-
-    def _real_initialize(self):
-        """Real initialization process. Redefine in subclasses."""
-        pass
-
-    def _real_extract(self, url):
-        """Real extraction process. Redefine in subclasses."""
-        pass
-
-    @classmethod
-    def ie_key(cls):
-        """A string for getting the InfoExtractor with get_info_extractor"""
-        return compat_str(cls.__name__[:-2])
-
-    @property
-    def IE_NAME(self):
-        return compat_str(type(self).__name__[:-2])
-
-    @staticmethod
-    def __can_accept_status_code(err, expected_status):
-        assert isinstance(err, compat_urllib_error.HTTPError)
-        if expected_status is None:
-            return False
-        if isinstance(expected_status, compat_integer_types):
-            return err.code == expected_status
-        elif isinstance(expected_status, (list, tuple)):
-            return err.code in expected_status
-        elif callable(expected_status):
-            return expected_status(err.code) is True
-        else:
-            assert False
-
-    def _request_webpage(self, url_or_request, video_id, note=None, errnote=None, fatal=True, data=None, headers={}, query={}, expected_status=None):
-        """
-        Return the response handle.
-
-        See _download_webpage docstring for arguments specification.
-        """
-        if note is None:
-            self.report_download_webpage(video_id)
-        elif note is not False:
-            if video_id is None:
-                self.to_screen('%s' % (note,))
-            else:
-                self.to_screen('%s: %s' % (video_id, note))
-
-        # Some sites check X-Forwarded-For HTTP header in order to figure out
-        # the origin of the client behind proxy. This allows bypassing geo
-        # restriction by faking this header's value to IP that belongs to some
-        # geo unrestricted country. We will do so once we encounter any
-        # geo restriction error.
-        if self._x_forwarded_for_ip:
-            if 'X-Forwarded-For' not in headers:
-                headers['X-Forwarded-For'] = self._x_forwarded_for_ip
-
-        if isinstance(url_or_request, compat_urllib_request.Request):
-            url_or_request = update_Request(
-                url_or_request, data=data, headers=headers, query=query)
-        else:
-            if query:
-                url_or_request = update_url_query(url_or_request, query)
-            if data is not None or headers:
-                url_or_request = sanitized_Request(url_or_request, data, headers)
-        try:
-            return self._downloader.urlopen(url_or_request)
-        except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
-            if isinstance(err, compat_urllib_error.HTTPError):
-                if self.__can_accept_status_code(err, expected_status):
-                    return err.fp
-
-            if errnote is False:
-                return False
-            if errnote is None:
-                errnote = 'Unable to download webpage'
-
-            errmsg = '%s: %s' % (errnote, error_to_compat_str(err))
-            if fatal:
-                raise ExtractorError(errmsg, sys.exc_info()[2], cause=err)
-            else:
-                self._downloader.report_warning(errmsg)
-                return False
-
-    def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None, fatal=True, encoding=None, data=None, headers={}, query={}, expected_status=None):
-        """
-        Return a tuple (page content as string, URL handle).
-
-        See _download_webpage docstring for arguments specification.
-        """
-        # Strip hashes from the URL (#1038)
-        if isinstance(url_or_request, (compat_str, str)):
-            url_or_request = url_or_request.partition('#')[0]
-
-        urlh = self._request_webpage(url_or_request, video_id, note, errnote, fatal, data=data, headers=headers, query=query, expected_status=expected_status)
-        if urlh is False:
-            assert not fatal
-            return False
-        content = self._webpage_read_content(urlh, url_or_request, video_id, note, errnote, fatal, encoding=encoding)
-        return (content, urlh)
-
-    @staticmethod
-    def _guess_encoding_from_content(content_type, webpage_bytes):
-        m = re.match(r'[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+\s*;\s*charset=(.+)', content_type)
-        if m:
-            encoding = m.group(1)
-        else:
-            m = re.search(br'<meta[^>]+charset=[\'"]?([^\'")]+)[ /\'">]',
-                          webpage_bytes[:1024])
-            if m:
-                encoding = m.group(1).decode('ascii')
-            elif webpage_bytes.startswith(b'\xff\xfe'):
-                encoding = 'utf-16'
-            else:
-                encoding = 'utf-8'
-
-        return encoding
-
-    def __check_blocked(self, content):
-        first_block = content[:512]
-        if ('<title>Access to this site is blocked</title>' in content and
-                'Websense' in first_block):
-            msg = 'Access to this webpage has been blocked by Websense filtering software in your network.'
-            blocked_iframe = self._html_search_regex(
-                r'<iframe src="([^"]+)"', content,
-                'Websense information URL', default=None)
-            if blocked_iframe:
-                msg += ' Visit %s for more details' % blocked_iframe
-            raise ExtractorError(msg, expected=True)
-        if '<title>The URL you requested has been blocked</title>' in first_block:
-            msg = (
-                'Access to this webpage has been blocked by Indian censorship. '
-                'Use a VPN or proxy server (with --proxy) to route around it.')
-            block_msg = self._html_search_regex(
-                r'</h1><p>(.*?)</p>',
-                content, 'block message', default=None)
-            if block_msg:
-                msg += ' (Message: "%s")' % block_msg.replace('\n', ' ')
-            raise ExtractorError(msg, expected=True)
-        if ('<title>TTK :: Доступ к ресурсу ограничен</title>' in content and
-                'blocklist.rkn.gov.ru' in content):
-            raise ExtractorError(
-                'Access to this webpage has been blocked by decision of the Russian government. '
-                'Visit http://blocklist.rkn.gov.ru/ for a block reason.',
-                expected=True)
-
-    def _webpage_read_content(self, urlh, url_or_request, video_id, note=None, errnote=None, fatal=True, prefix=None, encoding=None):
-        content_type = urlh.headers.get('Content-Type', '')
-        webpage_bytes = urlh.read()
-        if prefix is not None:
-            webpage_bytes = prefix + webpage_bytes
-        if not encoding:
-            encoding = self._guess_encoding_from_content(content_type, webpage_bytes)
-        if self._downloader.params.get('dump_intermediate_pages', False):
-            self.to_screen('Dumping request to ' + urlh.geturl())
-            dump = base64.b64encode(webpage_bytes).decode('ascii')
-            self._downloader.to_screen(dump)
-        if self._downloader.params.get('write_pages', False):
-            basen = '%s_%s' % (video_id, urlh.geturl())
-            if len(basen) > 240:
-                h = '___' + hashlib.md5(basen.encode('utf-8')).hexdigest()
-                basen = basen[:240 - len(h)] + h
-            raw_filename = basen + '.dump'
-            filename = sanitize_filename(raw_filename, restricted=True)
-            self.to_screen('Saving request to ' + filename)
-            # Working around MAX_PATH limitation on Windows (see
-            # http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx)
-            if compat_os_name == 'nt':
-                absfilepath = os.path.abspath(filename)
-                if len(absfilepath) > 259:
-                    filename = '\\\\?\\' + absfilepath
-            with open(filename, 'wb') as outf:
-                outf.write(webpage_bytes)
-
-        try:
-            content = webpage_bytes.decode(encoding, 'replace')
-        except LookupError:
-            content = webpage_bytes.decode('utf-8', 'replace')
-
-        self.__check_blocked(content)
-
-        return content
-
-    def _download_webpage(
-            self, url_or_request, video_id, note=None, errnote=None,
-            fatal=True, tries=1, timeout=5, encoding=None, data=None,
-            headers={}, query={}, expected_status=None):
-        """
-        Return the data of the page as a string.
-
-        Arguments:
-        url_or_request -- plain text URL as a string or
-            a compat_urllib_request.Requestobject
-        video_id -- Video/playlist/item identifier (string)
-
-        Keyword arguments:
-        note -- note printed before downloading (string)
-        errnote -- note printed in case of an error (string)
-        fatal -- flag denoting whether error should be considered fatal,
-            i.e. whether it should cause ExtractionError to be raised,
-            otherwise a warning will be reported and extraction continued
-        tries -- number of tries
-        timeout -- sleep interval between tries
-        encoding -- encoding for a page content decoding, guessed automatically
-            when not explicitly specified
-        data -- POST data (bytes)
-        headers -- HTTP headers (dict)
-        query -- URL query (dict)
-        expected_status -- allows to accept failed HTTP requests (non 2xx
-            status code) by explicitly specifying a set of accepted status
-            codes. Can be any of the following entities:
-                - an integer type specifying an exact failed status code to
-                  accept
-                - a list or a tuple of integer types specifying a list of
-                  failed status codes to accept
-                - a callable accepting an actual failed status code and
-                  returning True if it should be accepted
-            Note that this argument does not affect success status codes (2xx)
-            which are always accepted.
-        """
-
-        success = False
-        try_count = 0
-        while success is False:
-            try:
-                res = self._download_webpage_handle(
-                    url_or_request, video_id, note, errnote, fatal,
-                    encoding=encoding, data=data, headers=headers, query=query,
-                    expected_status=expected_status)
-                success = True
-            except compat_http_client.IncompleteRead as e:
-                try_count += 1
-                if try_count >= tries:
-                    raise e
-                self._sleep(timeout, video_id)
-        if res is False:
-            return res
-        else:
-            content, _ = res
-            return content
-
-    def _download_xml_handle(
-            self, url_or_request, video_id, note='Downloading XML',
-            errnote='Unable to download XML', transform_source=None,
-            fatal=True, encoding=None, data=None, headers={}, query={},
-            expected_status=None):
-        """
-        Return a tuple (xml as an xml.etree.ElementTree.Element, URL handle).
-
-        See _download_webpage docstring for arguments specification.
-        """
-        res = self._download_webpage_handle(
-            url_or_request, video_id, note, errnote, fatal=fatal,
-            encoding=encoding, data=data, headers=headers, query=query,
-            expected_status=expected_status)
-        if res is False:
-            return res
-        xml_string, urlh = res
-        return self._parse_xml(
-            xml_string, video_id, transform_source=transform_source,
-            fatal=fatal), urlh
-
-    def _download_xml(
-            self, url_or_request, video_id,
-            note='Downloading XML', errnote='Unable to download XML',
-            transform_source=None, fatal=True, encoding=None,
-            data=None, headers={}, query={}, expected_status=None):
-        """
-        Return the xml as an xml.etree.ElementTree.Element.
-
-        See _download_webpage docstring for arguments specification.
-        """
-        res = self._download_xml_handle(
-            url_or_request, video_id, note=note, errnote=errnote,
-            transform_source=transform_source, fatal=fatal, encoding=encoding,
-            data=data, headers=headers, query=query,
-            expected_status=expected_status)
-        return res if res is False else res[0]
-
-    def _parse_xml(self, xml_string, video_id, transform_source=None, fatal=True):
-        if transform_source:
-            xml_string = transform_source(xml_string)
-        try:
-            return compat_etree_fromstring(xml_string.encode('utf-8'))
-        except compat_xml_parse_error as ve:
-            errmsg = '%s: Failed to parse XML ' % video_id
-            if fatal:
-                raise ExtractorError(errmsg, cause=ve)
-            else:
-                self.report_warning(errmsg + str(ve))
-
-    def _download_json_handle(
-            self, url_or_request, video_id, note='Downloading JSON metadata',
-            errnote='Unable to download JSON metadata', transform_source=None,
-            fatal=True, encoding=None, data=None, headers={}, query={},
-            expected_status=None):
-        """
-        Return a tuple (JSON object, URL handle).
-
-        See _download_webpage docstring for arguments specification.
-        """
-        res = self._download_webpage_handle(
-            url_or_request, video_id, note, errnote, fatal=fatal,
-            encoding=encoding, data=data, headers=headers, query=query,
-            expected_status=expected_status)
-        if res is False:
-            return res
-        json_string, urlh = res
-        return self._parse_json(
-            json_string, video_id, transform_source=transform_source,
-            fatal=fatal), urlh
-
-    def _download_json(
-            self, url_or_request, video_id, note='Downloading JSON metadata',
-            errnote='Unable to download JSON metadata', transform_source=None,
-            fatal=True, encoding=None, data=None, headers={}, query={},
-            expected_status=None):
-        """
-        Return the JSON object as a dict.
-
-        See _download_webpage docstring for arguments specification.
-        """
-        res = self._download_json_handle(
-            url_or_request, video_id, note=note, errnote=errnote,
-            transform_source=transform_source, fatal=fatal, encoding=encoding,
-            data=data, headers=headers, query=query,
-            expected_status=expected_status)
-        return res if res is False else res[0]
-
-    def _parse_json(self, json_string, video_id, transform_source=None, fatal=True):
-        if transform_source:
-            json_string = transform_source(json_string)
-        try:
-            return json.loads(json_string)
-        except ValueError as ve:
-            errmsg = '%s: Failed to parse JSON ' % video_id
-            if fatal:
-                raise ExtractorError(errmsg, cause=ve)
-            else:
-                self.report_warning(errmsg + str(ve))
-
-    def report_warning(self, msg, video_id=None):
-        idstr = '' if video_id is None else '%s: ' % video_id
-        self._downloader.report_warning(
-            '[%s] %s%s' % (self.IE_NAME, idstr, msg))
-
-    def to_screen(self, msg):
-        """Print msg to screen, prefixing it with '[ie_name]'"""
-        self._downloader.to_screen('[%s] %s' % (self.IE_NAME, msg))
-
-    def report_extraction(self, id_or_name):
-        """Report information extraction."""
-        self.to_screen('%s: Extracting information' % id_or_name)
-
-    def report_download_webpage(self, video_id):
-        """Report webpage download."""
-        self.to_screen('%s: Downloading webpage' % video_id)
-
-    def report_age_confirmation(self):
-        """Report attempt to confirm age."""
-        self.to_screen('Confirming age')
-
-    def report_login(self):
-        """Report attempt to log in."""
-        self.to_screen('Logging in')
-
-    @staticmethod
-    def raise_login_required(msg='This video is only available for registered users'):
-        raise ExtractorError(
-            '%s. Use --username and --password or --netrc to provide account credentials.' % msg,
-            expected=True)
-
-    @staticmethod
-    def raise_geo_restricted(msg='This video is not available from your location due to geo restriction', countries=None):
-        raise GeoRestrictedError(msg, countries=countries)
-
-    # Methods for following #608
-    @staticmethod
-    def url_result(url, ie=None, video_id=None, video_title=None):
-        """Returns a URL that points to a page that should be processed"""
-        # TODO: ie should be the class used for getting the info
-        video_info = {'_type': 'url',
-                      'url': url,
-                      'ie_key': ie}
-        if video_id is not None:
-            video_info['id'] = video_id
-        if video_title is not None:
-            video_info['title'] = video_title
-        return video_info
-
-    def playlist_from_matches(self, matches, playlist_id=None, playlist_title=None, getter=None, ie=None):
-        urls = orderedSet(
-            self.url_result(self._proto_relative_url(getter(m) if getter else m), ie)
-            for m in matches)
-        return self.playlist_result(
-            urls, playlist_id=playlist_id, playlist_title=playlist_title)
-
-    @staticmethod
-    def playlist_result(entries, playlist_id=None, playlist_title=None, playlist_description=None):
-        """Returns a playlist"""
-        video_info = {'_type': 'playlist',
-                      'entries': entries}
-        if playlist_id:
-            video_info['id'] = playlist_id
-        if playlist_title:
-            video_info['title'] = playlist_title
-        if playlist_description:
-            video_info['description'] = playlist_description
-        return video_info
-
-    def _search_regex(self, pattern, string, name, default=NO_DEFAULT, fatal=True, flags=0, group=None):
-        """
-        Perform a regex search on the given string, using a single or a list of
-        patterns returning the first matching group.
-        In case of failure return a default value or raise a WARNING or a
-        RegexNotFoundError, depending on fatal, specifying the field name.
-        """
-        if isinstance(pattern, (str, compat_str, compiled_regex_type)):
-            mobj = re.search(pattern, string, flags)
-        else:
-            for p in pattern:
-                mobj = re.search(p, string, flags)
-                if mobj:
-                    break
-
-        if not self._downloader.params.get('no_color') and compat_os_name != 'nt' and sys.stderr.isatty():
-            _name = '\033[0;34m%s\033[0m' % name
-        else:
-            _name = name
-
-        if mobj:
-            if group is None:
-                # return the first matching group
-                return next(g for g in mobj.groups() if g is not None)
-            else:
-                return mobj.group(group)
-        elif default is not NO_DEFAULT:
-            return default
-        elif fatal:
-            raise RegexNotFoundError('Unable to extract %s' % _name)
-        else:
-            self._downloader.report_warning('unable to extract %s' % _name + bug_reports_message())
-            return None
-
-    def _html_search_regex(self, pattern, string, name, default=NO_DEFAULT, fatal=True, flags=0, group=None):
-        """
-        Like _search_regex, but strips HTML tags and unescapes entities.
-        """
-        res = self._search_regex(pattern, string, name, default, fatal, flags, group)
-        if res:
-            return clean_html(res).strip()
-        else:
-            return res
-
-    def _get_netrc_login_info(self, netrc_machine=None):
-        username = None
-        password = None
-        netrc_machine = netrc_machine or self._NETRC_MACHINE
-
-        if self._downloader.params.get('usenetrc', False):
-            try:
-                info = netrc.netrc().authenticators(netrc_machine)
-                if info is not None:
-                    username = info[0]
-                    password = info[2]
-                else:
-                    raise netrc.NetrcParseError(
-                        'No authenticators for %s' % netrc_machine)
-            except (IOError, netrc.NetrcParseError) as err:
-                self._downloader.report_warning(
-                    'parsing .netrc: %s' % error_to_compat_str(err))
-
-        return username, password
-
-    def _get_login_info(self, username_option='username', password_option='password', netrc_machine=None):
-        """
-        Get the login info as (username, password)
-        First look for the manually specified credentials using username_option
-        and password_option as keys in params dictionary. If no such credentials
-        available look in the netrc file using the netrc_machine or _NETRC_MACHINE
-        value.
-        If there's no info available, return (None, None)
-        """
-        if self._downloader is None:
-            return (None, None)
-
-        downloader_params = self._downloader.params
-
-        # Attempt to use provided username and password or .netrc data
-        if downloader_params.get(username_option) is not None:
-            username = downloader_params[username_option]
-            password = downloader_params[password_option]
-        else:
-            username, password = self._get_netrc_login_info(netrc_machine)
-
-        return username, password
-
-    def _get_tfa_info(self, note='two-factor verification code'):
-        """
-        Get the two-factor authentication info
-        TODO - asking the user will be required for sms/phone verify
-        currently just uses the command line option
-        If there's no info available, return None
-        """
-        if self._downloader is None:
-            return None
-        downloader_params = self._downloader.params
-
-        if downloader_params.get('twofactor') is not None:
-            return downloader_params['twofactor']
-
-        return compat_getpass('Type %s and press [Return]: ' % note)
-
-    # Helper functions for extracting OpenGraph info
-    @staticmethod
-    def _og_regexes(prop):
-        content_re = r'content=(?:"([^"]+?)"|\'([^\']+?)\'|\s*([^\s"\'=<>`]+?))'
-        property_re = (r'(?:name|property)=(?:\'og:%(prop)s\'|"og:%(prop)s"|\s*og:%(prop)s\b)'
-                       % {'prop': re.escape(prop)})
-        template = r'<meta[^>]+?%s[^>]+?%s'
-        return [
-            template % (property_re, content_re),
-            template % (content_re, property_re),
-        ]
-
-    @staticmethod
-    def _meta_regex(prop):
-        return r'''(?isx)<meta
-                    (?=[^>]+(?:itemprop|name|property|id|http-equiv)=(["\']?)%s\1)
-                    [^>]+?content=(["\'])(?P<content>.*?)\2''' % re.escape(prop)
-
-    def _og_search_property(self, prop, html, name=None, **kargs):
-        if not isinstance(prop, (list, tuple)):
-            prop = [prop]
-        if name is None:
-            name = 'OpenGraph %s' % prop[0]
-        og_regexes = []
-        for p in prop:
-            og_regexes.extend(self._og_regexes(p))
-        escaped = self._search_regex(og_regexes, html, name, flags=re.DOTALL, **kargs)
-        if escaped is None:
-            return None
-        return unescapeHTML(escaped)
-
-    def _og_search_thumbnail(self, html, **kargs):
-        return self._og_search_property('image', html, 'thumbnail URL', fatal=False, **kargs)
-
-    def _og_search_description(self, html, **kargs):
-        return self._og_search_property('description', html, fatal=False, **kargs)
-
-    def _og_search_title(self, html, **kargs):
-        return self._og_search_property('title', html, **kargs)
-
-    def _og_search_video_url(self, html, name='video url', secure=True, **kargs):
-        regexes = self._og_regexes('video') + self._og_regexes('video:url')
-        if secure:
-            regexes = self._og_regexes('video:secure_url') + regexes
-        return self._html_search_regex(regexes, html, name, **kargs)
-
-    def _og_search_url(self, html, **kargs):
-        return self._og_search_property('url', html, **kargs)
-
-    def _html_search_meta(self, name, html, display_name=None, fatal=False, **kwargs):
-        if not isinstance(name, (list, tuple)):
-            name = [name]
-        if display_name is None:
-            display_name = name[0]
-        return self._html_search_regex(
-            [self._meta_regex(n) for n in name],
-            html, display_name, fatal=fatal, group='content', **kwargs)
-
-    def _dc_search_uploader(self, html):
-        return self._html_search_meta('dc.creator', html, 'uploader')
-
-    def _rta_search(self, html):
-        # See http://www.rtalabel.org/index.php?content=howtofaq#single
-        if re.search(r'(?ix)<meta\s+name="rating"\s+'
-                     r'     content="RTA-5042-1996-1400-1577-RTA"',
-                     html):
-            return 18
-        return 0
-
-    def _media_rating_search(self, html):
-        # See http://www.tjg-designs.com/WP/metadata-code-examples-adding-metadata-to-your-web-pages/
-        rating = self._html_search_meta('rating', html)
-
-        if not rating:
-            return None
-
-        RATING_TABLE = {
-            'safe for kids': 0,
-            'general': 8,
-            '14 years': 14,
-            'mature': 17,
-            'restricted': 19,
-        }
-        return RATING_TABLE.get(rating.lower())
-
-    def _family_friendly_search(self, html):
-        # See http://schema.org/VideoObject
-        family_friendly = self._html_search_meta(
-            'isFamilyFriendly', html, default=None)
-
-        if not family_friendly:
-            return None
-
-        RATING_TABLE = {
-            '1': 0,
-            'true': 0,
-            '0': 18,
-            'false': 18,
-        }
-        return RATING_TABLE.get(family_friendly.lower())
-
-    def _twitter_search_player(self, html):
-        return self._html_search_meta('twitter:player', html,
-                                      'twitter card player')
-
-    def _search_json_ld(self, html, video_id, expected_type=None, **kwargs):
-        json_ld = self._search_regex(
-            JSON_LD_RE, html, 'JSON-LD', group='json_ld', **kwargs)
-        default = kwargs.get('default', NO_DEFAULT)
-        if not json_ld:
-            return default if default is not NO_DEFAULT else {}
-        # JSON-LD may be malformed and thus `fatal` should be respected.
-        # At the same time `default` may be passed that assumes `fatal=False`
-        # for _search_regex. Let's simulate the same behavior here as well.
-        fatal = kwargs.get('fatal', True) if default == NO_DEFAULT else False
-        return self._json_ld(json_ld, video_id, fatal=fatal, expected_type=expected_type)
-
-    def _json_ld(self, json_ld, video_id, fatal=True, expected_type=None):
-        if isinstance(json_ld, compat_str):
-            json_ld = self._parse_json(json_ld, video_id, fatal=fatal)
-        if not json_ld:
-            return {}
-        info = {}
-        if not isinstance(json_ld, (list, tuple, dict)):
-            return info
-        if isinstance(json_ld, dict):
-            json_ld = [json_ld]
-
-        INTERACTION_TYPE_MAP = {
-            'CommentAction': 'comment',
-            'AgreeAction': 'like',
-            'DisagreeAction': 'dislike',
-            'LikeAction': 'like',
-            'DislikeAction': 'dislike',
-            'ListenAction': 'view',
-            'WatchAction': 'view',
-            'ViewAction': 'view',
-        }
-
-        def extract_interaction_statistic(e):
-            interaction_statistic = e.get('interactionStatistic')
-            if not isinstance(interaction_statistic, list):
-                return
-            for is_e in interaction_statistic:
-                if not isinstance(is_e, dict):
-                    continue
-                if is_e.get('@type') != 'InteractionCounter':
-                    continue
-                interaction_type = is_e.get('interactionType')
-                if not isinstance(interaction_type, compat_str):
-                    continue
-                interaction_count = int_or_none(is_e.get('userInteractionCount'))
-                if interaction_count is None:
-                    continue
-                count_kind = INTERACTION_TYPE_MAP.get(interaction_type.split('/')[-1])
-                if not count_kind:
-                    continue
-                count_key = '%s_count' % count_kind
-                if info.get(count_key) is not None:
-                    continue
-                info[count_key] = interaction_count
-
-        def extract_video_object(e):
-            assert e['@type'] == 'VideoObject'
-            info.update({
-                'url': e.get('contentUrl'),
-                'title': unescapeHTML(e.get('name')),
-                'description': unescapeHTML(e.get('description')),
-                'thumbnail': e.get('thumbnailUrl') or e.get('thumbnailURL'),
-                'duration': parse_duration(e.get('duration')),
-                'timestamp': unified_timestamp(e.get('uploadDate')),
-                'filesize': float_or_none(e.get('contentSize')),
-                'tbr': int_or_none(e.get('bitrate')),
-                'width': int_or_none(e.get('width')),
-                'height': int_or_none(e.get('height')),
-                'view_count': int_or_none(e.get('interactionCount')),
-            })
-            extract_interaction_statistic(e)
-
-        for e in json_ld:
-            if isinstance(e.get('@context'), compat_str) and re.match(r'^https?://schema.org/?$', e.get('@context')):
-                item_type = e.get('@type')
-                if expected_type is not None and expected_type != item_type:
-                    return info
-                if item_type in ('TVEpisode', 'Episode'):
-                    info.update({
-                        'episode': unescapeHTML(e.get('name')),
-                        'episode_number': int_or_none(e.get('episodeNumber')),
-                        'description': unescapeHTML(e.get('description')),
-                    })
-                    part_of_season = e.get('partOfSeason')
-                    if isinstance(part_of_season, dict) and part_of_season.get('@type') in ('TVSeason', 'Season', 'CreativeWorkSeason'):
-                        info['season_number'] = int_or_none(part_of_season.get('seasonNumber'))
-                    part_of_series = e.get('partOfSeries') or e.get('partOfTVSeries')
-                    if isinstance(part_of_series, dict) and part_of_series.get('@type') in ('TVSeries', 'Series', 'CreativeWorkSeries'):
-                        info['series'] = unescapeHTML(part_of_series.get('name'))
-                elif item_type in ('Article', 'NewsArticle'):
-                    info.update({
-                        'timestamp': parse_iso8601(e.get('datePublished')),
-                        'title': unescapeHTML(e.get('headline')),
-                        'description': unescapeHTML(e.get('articleBody')),
-                    })
-                elif item_type == 'VideoObject':
-                    extract_video_object(e)
-                    continue
-                video = e.get('video')
-                if isinstance(video, dict) and video.get('@type') == 'VideoObject':
-                    extract_video_object(video)
-                break
-        return dict((k, v) for k, v in info.items() if v is not None)
-
-    @staticmethod
-    def _hidden_inputs(html):
-        html = re.sub(r'<!--(?:(?!<!--).)*-->', '', html)
-        hidden_inputs = {}
-        for input in re.findall(r'(?i)(<input[^>]+>)', html):
-            attrs = extract_attributes(input)
-            if not input:
-                continue
-            if attrs.get('type') not in ('hidden', 'submit'):
-                continue
-            name = attrs.get('name') or attrs.get('id')
-            value = attrs.get('value')
-            if name and value is not None:
-                hidden_inputs[name] = value
-        return hidden_inputs
-
-    def _form_hidden_inputs(self, form_id, html):
-        form = self._search_regex(
-            r'(?is)<form[^>]+?id=(["\'])%s\1[^>]*>(?P<form>.+?)</form>' % form_id,
-            html, '%s form' % form_id, group='form')
-        return self._hidden_inputs(form)
-
-    def _sort_formats(self, formats, field_preference=None):
-        if not formats:
-            raise ExtractorError('No video formats found')
-
-        for f in formats:
-            # Automatically determine tbr when missing based on abr and vbr (improves
-            # formats sorting in some cases)
-            if 'tbr' not in f and f.get('abr') is not None and f.get('vbr') is not None:
-                f['tbr'] = f['abr'] + f['vbr']
-
-        def _formats_key(f):
-            # TODO remove the following workaround
-            from ..utils import determine_ext
-            if not f.get('ext') and 'url' in f:
-                f['ext'] = determine_ext(f['url'])
-
-            if isinstance(field_preference, (list, tuple)):
-                return tuple(
-                    f.get(field)
-                    if f.get(field) is not None
-                    else ('' if field == 'format_id' else -1)
-                    for field in field_preference)
-
-            preference = f.get('preference')
-            if preference is None:
-                preference = 0
-                if f.get('ext') in ['f4f', 'f4m']:  # Not yet supported
-                    preference -= 0.5
-
-            protocol = f.get('protocol') or determine_protocol(f)
-            proto_preference = 0 if protocol in ['http', 'https'] else (-0.5 if protocol == 'rtsp' else -0.1)
-
-            if f.get('vcodec') == 'none':  # audio only
-                preference -= 50
-                if self._downloader.params.get('prefer_free_formats'):
-                    ORDER = ['aac', 'mp3', 'm4a', 'webm', 'ogg', 'opus']
-                else:
-                    ORDER = ['webm', 'opus', 'ogg', 'mp3', 'aac', 'm4a']
-                ext_preference = 0
-                try:
-                    audio_ext_preference = ORDER.index(f['ext'])
-                except ValueError:
-                    audio_ext_preference = -1
-            else:
-                if f.get('acodec') == 'none':  # video only
-                    preference -= 40
-                if self._downloader.params.get('prefer_free_formats'):
-                    ORDER = ['flv', 'mp4', 'webm']
-                else:
-                    ORDER = ['webm', 'flv', 'mp4']
-                try:
-                    ext_preference = ORDER.index(f['ext'])
-                except ValueError:
-                    ext_preference = -1
-                audio_ext_preference = 0
-
-            return (
-                preference,
-                f.get('language_preference') if f.get('language_preference') is not None else -1,
-                f.get('quality') if f.get('quality') is not None else -1,
-                f.get('tbr') if f.get('tbr') is not None else -1,
-                f.get('filesize') if f.get('filesize') is not None else -1,
-                f.get('vbr') if f.get('vbr') is not None else -1,
-                f.get('height') if f.get('height') is not None else -1,
-                f.get('width') if f.get('width') is not None else -1,
-                proto_preference,
-                ext_preference,
-                f.get('abr') if f.get('abr') is not None else -1,
-                audio_ext_preference,
-                f.get('fps') if f.get('fps') is not None else -1,
-                f.get('filesize_approx') if f.get('filesize_approx') is not None else -1,
-                f.get('source_preference') if f.get('source_preference') is not None else -1,
-                f.get('format_id') if f.get('format_id') is not None else '',
-            )
-        formats.sort(key=_formats_key)
-
-    def _check_formats(self, formats, video_id):
-        if formats:
-            formats[:] = filter(
-                lambda f: self._is_valid_url(
-                    f['url'], video_id,
-                    item='%s video format' % f.get('format_id') if f.get('format_id') else 'video'),
-                formats)
-
-    @staticmethod
-    def _remove_duplicate_formats(formats):
-        format_urls = set()
-        unique_formats = []
-        for f in formats:
-            if f['url'] not in format_urls:
-                format_urls.add(f['url'])
-                unique_formats.append(f)
-        formats[:] = unique_formats
-
-    def _is_valid_url(self, url, video_id, item='video', headers={}):
-        url = self._proto_relative_url(url, scheme='http:')
-        # For now assume non HTTP(S) URLs always valid
-        if not (url.startswith('http://') or url.startswith('https://')):
-            return True
-        try:
-            self._request_webpage(url, video_id, 'Checking %s URL' % item, headers=headers)
-            return True
-        except ExtractorError as e:
-            if isinstance(e.cause, compat_urllib_error.URLError):
-                self.to_screen(
-                    '%s: %s URL is invalid, skipping' % (video_id, item))
-                return False
-            raise
-
-    def http_scheme(self):
-        """ Either "http:" or "https:", depending on the user's preferences """
-        return (
-            'http:'
-            if self._downloader.params.get('prefer_insecure', False)
-            else 'https:')
-
-    def _proto_relative_url(self, url, scheme=None):
-        if url is None:
-            return url
-        if url.startswith('//'):
-            if scheme is None:
-                scheme = self.http_scheme()
-            return scheme + url
-        else:
-            return url
-
-    def _sleep(self, timeout, video_id, msg_template=None):
-        if msg_template is None:
-            msg_template = '%(video_id)s: Waiting for %(timeout)s seconds'
-        msg = msg_template % {'video_id': video_id, 'timeout': timeout}
-        self.to_screen(msg)
-        time.sleep(timeout)
-
-    def _extract_f4m_formats(self, manifest_url, video_id, preference=None, f4m_id=None,
-                             transform_source=lambda s: fix_xml_ampersands(s).strip(),
-                             fatal=True, m3u8_id=None):
-        manifest = self._download_xml(
-            manifest_url, video_id, 'Downloading f4m manifest',
-            'Unable to download f4m manifest',
-            # Some manifests may be malformed, e.g. prosiebensat1 generated manifests
-            # (see https://github.com/rg3/youtube-dl/issues/6215#issuecomment-121704244)
-            transform_source=transform_source,
-            fatal=fatal)
-
-        if manifest is False:
-            return []
-
-        return self._parse_f4m_formats(
-            manifest, manifest_url, video_id, preference=preference, f4m_id=f4m_id,
-            transform_source=transform_source, fatal=fatal, m3u8_id=m3u8_id)
-
-    def _parse_f4m_formats(self, manifest, manifest_url, video_id, preference=None, f4m_id=None,
-                           transform_source=lambda s: fix_xml_ampersands(s).strip(),
-                           fatal=True, m3u8_id=None):
-        # currently youtube-dl cannot decode the playerVerificationChallenge as Akamai uses Adobe Alchemy
-        akamai_pv = manifest.find('{http://ns.adobe.com/f4m/1.0}pv-2.0')
-        if akamai_pv is not None and ';' in akamai_pv.text:
-            playerVerificationChallenge = akamai_pv.text.split(';')[0]
-            if playerVerificationChallenge.strip() != '':
-                return []
-
-        formats = []
-        manifest_version = '1.0'
-        media_nodes = manifest.findall('{http://ns.adobe.com/f4m/1.0}media')
-        if not media_nodes:
-            manifest_version = '2.0'
-            media_nodes = manifest.findall('{http://ns.adobe.com/f4m/2.0}media')
-        # Remove unsupported DRM protected media from final formats
-        # rendition (see https://github.com/rg3/youtube-dl/issues/8573).
-        media_nodes = remove_encrypted_media(media_nodes)
-        if not media_nodes:
-            return formats
-
-        manifest_base_url = get_base_url(manifest)
-
-        bootstrap_info = xpath_element(
-            manifest, ['{http://ns.adobe.com/f4m/1.0}bootstrapInfo', '{http://ns.adobe.com/f4m/2.0}bootstrapInfo'],
-            'bootstrap info', default=None)
-
-        vcodec = None
-        mime_type = xpath_text(
-            manifest, ['{http://ns.adobe.com/f4m/1.0}mimeType', '{http://ns.adobe.com/f4m/2.0}mimeType'],
-            'base URL', default=None)
-        if mime_type and mime_type.startswith('audio/'):
-            vcodec = 'none'
-
-        for i, media_el in enumerate(media_nodes):
-            tbr = int_or_none(media_el.attrib.get('bitrate'))
-            width = int_or_none(media_el.attrib.get('width'))
-            height = int_or_none(media_el.attrib.get('height'))
-            format_id = '-'.join(filter(None, [f4m_id, compat_str(i if tbr is None else tbr)]))
-            # If <bootstrapInfo> is present, the specified f4m is a
-            # stream-level manifest, and only set-level manifests may refer to
-            # external resources.  See section 11.4 and section 4 of F4M spec
-            if bootstrap_info is None:
-                media_url = None
-                # @href is introduced in 2.0, see section 11.6 of F4M spec
-                if manifest_version == '2.0':
-                    media_url = media_el.attrib.get('href')
-                if media_url is None:
-                    media_url = media_el.attrib.get('url')
-                if not media_url:
-                    continue
-                manifest_url = (
-                    media_url if media_url.startswith('http://') or media_url.startswith('https://')
-                    else ((manifest_base_url or '/'.join(manifest_url.split('/')[:-1])) + '/' + media_url))
-                # If media_url is itself a f4m manifest do the recursive extraction
-                # since bitrates in parent manifest (this one) and media_url manifest
-                # may differ leading to inability to resolve the format by requested
-                # bitrate in f4m downloader
-                ext = determine_ext(manifest_url)
-                if ext == 'f4m':
-                    f4m_formats = self._extract_f4m_formats(
-                        manifest_url, video_id, preference=preference, f4m_id=f4m_id,
-                        transform_source=transform_source, fatal=fatal)
-                    # Sometimes stream-level manifest contains single media entry that
-                    # does not contain any quality metadata (e.g. http://matchtv.ru/#live-player).
-                    # At the same time parent's media entry in set-level manifest may
-                    # contain it. We will copy it from parent in such cases.
-                    if len(f4m_formats) == 1:
-                        f = f4m_formats[0]
-                        f.update({
-                            'tbr': f.get('tbr') or tbr,
-                            'width': f.get('width') or width,
-                            'height': f.get('height') or height,
-                            'format_id': f.get('format_id') if not tbr else format_id,
-                            'vcodec': vcodec,
-                        })
-                    formats.extend(f4m_formats)
-                    continue
-                elif ext == 'm3u8':
-                    formats.extend(self._extract_m3u8_formats(
-                        manifest_url, video_id, 'mp4', preference=preference,
-                        m3u8_id=m3u8_id, fatal=fatal))
-                    continue
-            formats.append({
-                'format_id': format_id,
-                'url': manifest_url,
-                'manifest_url': manifest_url,
-                'ext': 'flv' if bootstrap_info is not None else None,
-                'protocol': 'f4m',
-                'tbr': tbr,
-                'width': width,
-                'height': height,
-                'vcodec': vcodec,
-                'preference': preference,
-            })
-        return formats
-
-    def _m3u8_meta_format(self, m3u8_url, ext=None, preference=None, m3u8_id=None):
-        return {
-            'format_id': '-'.join(filter(None, [m3u8_id, 'meta'])),
-            'url': m3u8_url,
-            'ext': ext,
-            'protocol': 'm3u8',
-            'preference': preference - 100 if preference else -100,
-            'resolution': 'multiple',
-            'format_note': 'Quality selection URL',
-        }
-
-    def _extract_m3u8_formats(self, m3u8_url, video_id, ext=None,
-                              entry_protocol='m3u8', preference=None,
-                              m3u8_id=None, note=None, errnote=None,
-                              fatal=True, live=False):
-        res = self._download_webpage_handle(
-            m3u8_url, video_id,
-            note=note or 'Downloading m3u8 information',
-            errnote=errnote or 'Failed to download m3u8 information',
-            fatal=fatal)
-
-        if res is False:
-            return []
-
-        m3u8_doc, urlh = res
-        m3u8_url = urlh.geturl()
-
-        return self._parse_m3u8_formats(
-            m3u8_doc, m3u8_url, ext=ext, entry_protocol=entry_protocol,
-            preference=preference, m3u8_id=m3u8_id, live=live)
-
-    def _parse_m3u8_formats(self, m3u8_doc, m3u8_url, ext=None,
-                            entry_protocol='m3u8', preference=None,
-                            m3u8_id=None, live=False):
-        if '#EXT-X-FAXS-CM:' in m3u8_doc:  # Adobe Flash Access
-            return []
-
-        if re.search(r'#EXT-X-SESSION-KEY:.*?URI="skd://', m3u8_doc):  # Apple FairPlay
-            return []
-
-        formats = []
-
-        format_url = lambda u: (
-            u
-            if re.match(r'^https?://', u)
-            else compat_urlparse.urljoin(m3u8_url, u))
-
-        # References:
-        # 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-21
-        # 2. https://github.com/rg3/youtube-dl/issues/12211
-
-        # We should try extracting formats only from master playlists [1, 4.3.4],
-        # i.e. playlists that describe available qualities. On the other hand
-        # media playlists [1, 4.3.3] should be returned as is since they contain
-        # just the media without qualities renditions.
-        # Fortunately, master playlist can be easily distinguished from media
-        # playlist based on particular tags availability. As of [1, 4.3.3, 4.3.4]
-        # master playlist tags MUST NOT appear in a media playist and vice versa.
-        # As of [1, 4.3.3.1] #EXT-X-TARGETDURATION tag is REQUIRED for every
-        # media playlist and MUST NOT appear in master playlist thus we can
-        # clearly detect media playlist with this criterion.
-
-        if '#EXT-X-TARGETDURATION' in m3u8_doc:  # media playlist, return as is
-            return [{
-                'url': m3u8_url,
-                'format_id': m3u8_id,
-                'ext': ext,
-                'protocol': entry_protocol,
-                'preference': preference,
-            }]
-
-        groups = {}
-        last_stream_inf = {}
-
-        def extract_media(x_media_line):
-            media = parse_m3u8_attributes(x_media_line)
-            # As per [1, 4.3.4.1] TYPE, GROUP-ID and NAME are REQUIRED
-            media_type, group_id, name = media.get('TYPE'), media.get('GROUP-ID'), media.get('NAME')
-            if not (media_type and group_id and name):
-                return
-            groups.setdefault(group_id, []).append(media)
-            if media_type not in ('VIDEO', 'AUDIO'):
-                return
-            media_url = media.get('URI')
-            if media_url:
-                format_id = []
-                for v in (m3u8_id, group_id, name):
-                    if v:
-                        format_id.append(v)
-                f = {
-                    'format_id': '-'.join(format_id),
-                    'url': format_url(media_url),
-                    'manifest_url': m3u8_url,
-                    'language': media.get('LANGUAGE'),
-                    'ext': ext,
-                    'protocol': entry_protocol,
-                    'preference': preference,
-                }
-                if media_type == 'AUDIO':
-                    f['vcodec'] = 'none'
-                formats.append(f)
-
-        def build_stream_name():
-            # Despite specification does not mention NAME attribute for
-            # EXT-X-STREAM-INF tag it still sometimes may be present (see [1]
-            # or vidio test in TestInfoExtractor.test_parse_m3u8_formats)
-            # 1. http://www.vidio.com/watch/165683-dj_ambred-booyah-live-2015
-            stream_name = last_stream_inf.get('NAME')
-            if stream_name:
-                return stream_name
-            # If there is no NAME in EXT-X-STREAM-INF it will be obtained
-            # from corresponding rendition group
-            stream_group_id = last_stream_inf.get('VIDEO')
-            if not stream_group_id:
-                return
-            stream_group = groups.get(stream_group_id)
-            if not stream_group:
-                return stream_group_id
-            rendition = stream_group[0]
-            return rendition.get('NAME') or stream_group_id
-
-        for line in m3u8_doc.splitlines():
-            if line.startswith('#EXT-X-STREAM-INF:'):
-                last_stream_inf = parse_m3u8_attributes(line)
-            elif line.startswith('#EXT-X-MEDIA:'):
-                extract_media(line)
-            elif line.startswith('#') or not line.strip():
-                continue
-            else:
-                tbr = float_or_none(
-                    last_stream_inf.get('AVERAGE-BANDWIDTH') or
-                    last_stream_inf.get('BANDWIDTH'), scale=1000)
-                format_id = []
-                if m3u8_id:
-                    format_id.append(m3u8_id)
-                stream_name = build_stream_name()
-                # Bandwidth of live streams may differ over time thus making
-                # format_id unpredictable. So it's better to keep provided
-                # format_id intact.
-                if not live:
-                    format_id.append(stream_name if stream_name else '%d' % (tbr if tbr else len(formats)))
-                manifest_url = format_url(line.strip())
-                f = {
-                    'format_id': '-'.join(format_id),
-                    'url': manifest_url,
-                    'manifest_url': m3u8_url,
-                    'tbr': tbr,
-                    'ext': ext,
-                    'fps': float_or_none(last_stream_inf.get('FRAME-RATE')),
-                    'protocol': entry_protocol,
-                    'preference': preference,
-                }
-                resolution = last_stream_inf.get('RESOLUTION')
-                if resolution:
-                    mobj = re.search(r'(?P<width>\d+)[xX](?P<height>\d+)', resolution)
-                    if mobj:
-                        f['width'] = int(mobj.group('width'))
-                        f['height'] = int(mobj.group('height'))
-                # Unified Streaming Platform
-                mobj = re.search(
-                    r'audio.*?(?:%3D|=)(\d+)(?:-video.*?(?:%3D|=)(\d+))?', f['url'])
-                if mobj:
-                    abr, vbr = mobj.groups()
-                    abr, vbr = float_or_none(abr, 1000), float_or_none(vbr, 1000)
-                    f.update({
-                        'vbr': vbr,
-                        'abr': abr,
-                    })
-                codecs = parse_codecs(last_stream_inf.get('CODECS'))
-                f.update(codecs)
-                audio_group_id = last_stream_inf.get('AUDIO')
-                # As per [1, 4.3.4.1.1] any EXT-X-STREAM-INF tag which
-                # references a rendition group MUST have a CODECS attribute.
-                # However, this is not always respected, for example, [2]
-                # contains EXT-X-STREAM-INF tag which references AUDIO
-                # rendition group but does not have CODECS and despite
-                # referencing audio group an audio group, it represents
-                # a complete (with audio and video) format. So, for such cases
-                # we will ignore references to rendition groups and treat them
-                # as complete formats.
-                if audio_group_id and codecs and f.get('vcodec') != 'none':
-                    audio_group = groups.get(audio_group_id)
-                    if audio_group and audio_group[0].get('URI'):
-                        # TODO: update acodec for audio only formats with
-                        # the same GROUP-ID
-                        f['acodec'] = 'none'
-                formats.append(f)
-                last_stream_inf = {}
-        return formats
-
-    @staticmethod
-    def _xpath_ns(path, namespace=None):
-        if not namespace:
-            return path
-        out = []
-        for c in path.split('/'):
-            if not c or c == '.':
-                out.append(c)
-            else:
-                out.append('{%s}%s' % (namespace, c))
-        return '/'.join(out)
-
-    def _extract_smil_formats(self, smil_url, video_id, fatal=True, f4m_params=None, transform_source=None):
-        smil = self._download_smil(smil_url, video_id, fatal=fatal, transform_source=transform_source)
-
-        if smil is False:
-            assert not fatal
-            return []
-
-        namespace = self._parse_smil_namespace(smil)
-
-        return self._parse_smil_formats(
-            smil, smil_url, video_id, namespace=namespace, f4m_params=f4m_params)
-
-    def _extract_smil_info(self, smil_url, video_id, fatal=True, f4m_params=None):
-        smil = self._download_smil(smil_url, video_id, fatal=fatal)
-        if smil is False:
-            return {}
-        return self._parse_smil(smil, smil_url, video_id, f4m_params=f4m_params)
-
-    def _download_smil(self, smil_url, video_id, fatal=True, transform_source=None):
-        return self._download_xml(
-            smil_url, video_id, 'Downloading SMIL file',
-            'Unable to download SMIL file', fatal=fatal, transform_source=transform_source)
-
-    def _parse_smil(self, smil, smil_url, video_id, f4m_params=None):
-        namespace = self._parse_smil_namespace(smil)
-
-        formats = self._parse_smil_formats(
-            smil, smil_url, video_id, namespace=namespace, f4m_params=f4m_params)
-        subtitles = self._parse_smil_subtitles(smil, namespace=namespace)
-
-        video_id = os.path.splitext(url_basename(smil_url))[0]
-        title = None
-        description = None
-        upload_date = None
-        for meta in smil.findall(self._xpath_ns('./head/meta', namespace)):
-            name = meta.attrib.get('name')
-            content = meta.attrib.get('content')
-            if not name or not content:
-                continue
-            if not title and name == 'title':
-                title = content
-            elif not description and name in ('description', 'abstract'):
-                description = content
-            elif not upload_date and name == 'date':
-                upload_date = unified_strdate(content)
-
-        thumbnails = [{
-            'id': image.get('type'),
-            'url': image.get('src'),
-            'width': int_or_none(image.get('width')),
-            'height': int_or_none(image.get('height')),
-        } for image in smil.findall(self._xpath_ns('.//image', namespace)) if image.get('src')]
-
-        return {
-            'id': video_id,
-            'title': title or video_id,
-            'description': description,
-            'upload_date': upload_date,
-            'thumbnails': thumbnails,
-            'formats': formats,
-            'subtitles': subtitles,
-        }
-
-    def _parse_smil_namespace(self, smil):
-        return self._search_regex(
-            r'(?i)^{([^}]+)?}smil$', smil.tag, 'namespace', default=None)
-
-    def _parse_smil_formats(self, smil, smil_url, video_id, namespace=None, f4m_params=None, transform_rtmp_url=None):
-        base = smil_url
-        for meta in smil.findall(self._xpath_ns('./head/meta', namespace)):
-            b = meta.get('base') or meta.get('httpBase')
-            if b:
-                base = b
-                break
-
-        formats = []
-        rtmp_count = 0
-        http_count = 0
-        m3u8_count = 0
-
-        srcs = []
-        media = smil.findall(self._xpath_ns('.//video', namespace)) + smil.findall(self._xpath_ns('.//audio', namespace))
-        for medium in media:
-            src = medium.get('src')
-            if not src or src in srcs:
-                continue
-            srcs.append(src)
-
-            bitrate = float_or_none(medium.get('system-bitrate') or medium.get('systemBitrate'), 1000)
-            filesize = int_or_none(medium.get('size') or medium.get('fileSize'))
-            width = int_or_none(medium.get('width'))
-            height = int_or_none(medium.get('height'))
-            proto = medium.get('proto')
-            ext = medium.get('ext')
-            src_ext = determine_ext(src)
-            streamer = medium.get('streamer') or base
-
-            if proto == 'rtmp' or streamer.startswith('rtmp'):
-                rtmp_count += 1
-                formats.append({
-                    'url': streamer,
-                    'play_path': src,
-                    'ext': 'flv',
-                    'format_id': 'rtmp-%d' % (rtmp_count if bitrate is None else bitrate),
-                    'tbr': bitrate,
-                    'filesize': filesize,
-                    'width': width,
-                    'height': height,
-                })
-                if transform_rtmp_url:
-                    streamer, src = transform_rtmp_url(streamer, src)
-                    formats[-1].update({
-                        'url': streamer,
-                        'play_path': src,
-                    })
-                continue
-
-            src_url = src if src.startswith('http') else compat_urlparse.urljoin(base, src)
-            src_url = src_url.strip()
-
-            if proto == 'm3u8' or src_ext == 'm3u8':
-                m3u8_formats = self._extract_m3u8_formats(
-                    src_url, video_id, ext or 'mp4', m3u8_id='hls', fatal=False)
-                if len(m3u8_formats) == 1:
-                    m3u8_count += 1
-                    m3u8_formats[0].update({
-                        'format_id': 'hls-%d' % (m3u8_count if bitrate is None else bitrate),
-                        'tbr': bitrate,
-                        'width': width,
-                        'height': height,
-                    })
-                formats.extend(m3u8_formats)
-                continue
-
-            if src_ext == 'f4m':
-                f4m_url = src_url
-                if not f4m_params:
-                    f4m_params = {
-                        'hdcore': '3.2.0',
-                        'plugin': 'flowplayer-3.2.0.1',
-                    }
-                f4m_url += '&' if '?' in f4m_url else '?'
-                f4m_url += compat_urllib_parse_urlencode(f4m_params)
-                formats.extend(self._extract_f4m_formats(f4m_url, video_id, f4m_id='hds', fatal=False))
-                continue
-
-            if src_url.startswith('http') and self._is_valid_url(src, video_id):
-                http_count += 1
-                formats.append({
-                    'url': src_url,
-                    'ext': ext or src_ext or 'flv',
-                    'format_id': 'http-%d' % (bitrate or http_count),
-                    'tbr': bitrate,
-                    'filesize': filesize,
-                    'width': width,
-                    'height': height,
-                })
-                continue
-
-        return formats
-
-    def _parse_smil_subtitles(self, smil, namespace=None, subtitles_lang='en'):
-        urls = []
-        subtitles = {}
-        for num, textstream in enumerate(smil.findall(self._xpath_ns('.//textstream', namespace))):
-            src = textstream.get('src')
-            if not src or src in urls:
-                continue
-            urls.append(src)
-            ext = textstream.get('ext') or mimetype2ext(textstream.get('type')) or determine_ext(src)
-            lang = textstream.get('systemLanguage') or textstream.get('systemLanguageName') or textstream.get('lang') or subtitles_lang
-            subtitles.setdefault(lang, []).append({
-                'url': src,
-                'ext': ext,
-            })
-        return subtitles
-
-    def _extract_xspf_playlist(self, xspf_url, playlist_id, fatal=True):
-        xspf = self._download_xml(
-            xspf_url, playlist_id, 'Downloading xpsf playlist',
-            'Unable to download xspf manifest', fatal=fatal)
-        if xspf is False:
-            return []
-        return self._parse_xspf(
-            xspf, playlist_id, xspf_url=xspf_url,
-            xspf_base_url=base_url(xspf_url))
-
-    def _parse_xspf(self, xspf_doc, playlist_id, xspf_url=None, xspf_base_url=None):
-        NS_MAP = {
-            'xspf': 'http://xspf.org/ns/0/',
-            's1': 'http://static.streamone.nl/player/ns/0',
-        }
-
-        entries = []
-        for track in xspf_doc.findall(xpath_with_ns('./xspf:trackList/xspf:track', NS_MAP)):
-            title = xpath_text(
-                track, xpath_with_ns('./xspf:title', NS_MAP), 'title', default=playlist_id)
-            description = xpath_text(
-                track, xpath_with_ns('./xspf:annotation', NS_MAP), 'description')
-            thumbnail = xpath_text(
-                track, xpath_with_ns('./xspf:image', NS_MAP), 'thumbnail')
-            duration = float_or_none(
-                xpath_text(track, xpath_with_ns('./xspf:duration', NS_MAP), 'duration'), 1000)
-
-            formats = []
-            for location in track.findall(xpath_with_ns('./xspf:location', NS_MAP)):
-                format_url = urljoin(xspf_base_url, location.text)
-                if not format_url:
-                    continue
-                formats.append({
-                    'url': format_url,
-                    'manifest_url': xspf_url,
-                    'format_id': location.get(xpath_with_ns('s1:label', NS_MAP)),
-                    'width': int_or_none(location.get(xpath_with_ns('s1:width', NS_MAP))),
-                    'height': int_or_none(location.get(xpath_with_ns('s1:height', NS_MAP))),
-                })
-            self._sort_formats(formats)
-
-            entries.append({
-                'id': playlist_id,
-                'title': title,
-                'description': description,
-                'thumbnail': thumbnail,
-                'duration': duration,
-                'formats': formats,
-            })
-        return entries
-
-    def _extract_mpd_formats(self, mpd_url, video_id, mpd_id=None, note=None, errnote=None, fatal=True, formats_dict={}):
-        res = self._download_xml_handle(
-            mpd_url, video_id,
-            note=note or 'Downloading MPD manifest',
-            errnote=errnote or 'Failed to download MPD manifest',
-            fatal=fatal)
-        if res is False:
-            return []
-        mpd_doc, urlh = res
-        mpd_base_url = base_url(urlh.geturl())
-
-        return self._parse_mpd_formats(
-            mpd_doc, mpd_id=mpd_id, mpd_base_url=mpd_base_url,
-            formats_dict=formats_dict, mpd_url=mpd_url)
-
-    def _parse_mpd_formats(self, mpd_doc, mpd_id=None, mpd_base_url='', formats_dict={}, mpd_url=None):
-        """
-        Parse formats from MPD manifest.
-        References:
-         1. MPEG-DASH Standard, ISO/IEC 23009-1:2014(E),
-            http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip
-         2. https://en.wikipedia.org/wiki/Dynamic_Adaptive_Streaming_over_HTTP
-        """
-        if mpd_doc.get('type') == 'dynamic':
-            return []
-
-        namespace = self._search_regex(r'(?i)^{([^}]+)?}MPD$', mpd_doc.tag, 'namespace', default=None)
-
-        def _add_ns(path):
-            return self._xpath_ns(path, namespace)
-
-        def is_drm_protected(element):
-            return element.find(_add_ns('ContentProtection')) is not None
-
-        def extract_multisegment_info(element, ms_parent_info):
-            ms_info = ms_parent_info.copy()
-
-            # As per [1, 5.3.9.2.2] SegmentList and SegmentTemplate share some
-            # common attributes and elements.  We will only extract relevant
-            # for us.
-            def extract_common(source):
-                segment_timeline = source.find(_add_ns('SegmentTimeline'))
-                if segment_timeline is not None:
-                    s_e = segment_timeline.findall(_add_ns('S'))
-                    if s_e:
-                        ms_info['total_number'] = 0
-                        ms_info['s'] = []
-                        for s in s_e:
-                            r = int(s.get('r', 0))
-                            ms_info['total_number'] += 1 + r
-                            ms_info['s'].append({
-                                't': int(s.get('t', 0)),
-                                # @d is mandatory (see [1, 5.3.9.6.2, Table 17, page 60])
-                                'd': int(s.attrib['d']),
-                                'r': r,
-                            })
-                start_number = source.get('startNumber')
-                if start_number:
-                    ms_info['start_number'] = int(start_number)
-                timescale = source.get('timescale')
-                if timescale:
-                    ms_info['timescale'] = int(timescale)
-                segment_duration = source.get('duration')
-                if segment_duration:
-                    ms_info['segment_duration'] = float(segment_duration)
-
-            def extract_Initialization(source):
-                initialization = source.find(_add_ns('Initialization'))
-                if initialization is not None:
-                    ms_info['initialization_url'] = initialization.attrib['sourceURL']
-
-            segment_list = element.find(_add_ns('SegmentList'))
-            if segment_list is not None:
-                extract_common(segment_list)
-                extract_Initialization(segment_list)
-                segment_urls_e = segment_list.findall(_add_ns('SegmentURL'))
-                if segment_urls_e:
-                    ms_info['segment_urls'] = [segment.attrib['media'] for segment in segment_urls_e]
-            else:
-                segment_template = element.find(_add_ns('SegmentTemplate'))
-                if segment_template is not None:
-                    extract_common(segment_template)
-                    media = segment_template.get('media')
-                    if media:
-                        ms_info['media'] = media
-                    initialization = segment_template.get('initialization')
-                    if initialization:
-                        ms_info['initialization'] = initialization
-                    else:
-                        extract_Initialization(segment_template)
-            return ms_info
-
-        mpd_duration = parse_duration(mpd_doc.get('mediaPresentationDuration'))
-        formats = []
-        for period in mpd_doc.findall(_add_ns('Period')):
-            period_duration = parse_duration(period.get('duration')) or mpd_duration
-            period_ms_info = extract_multisegment_info(period, {
-                'start_number': 1,
-                'timescale': 1,
-            })
-            for adaptation_set in period.findall(_add_ns('AdaptationSet')):
-                if is_drm_protected(adaptation_set):
-                    continue
-                adaption_set_ms_info = extract_multisegment_info(adaptation_set, period_ms_info)
-                for representation in adaptation_set.findall(_add_ns('Representation')):
-                    if is_drm_protected(representation):
-                        continue
-                    representation_attrib = adaptation_set.attrib.copy()
-                    representation_attrib.update(representation.attrib)
-                    # According to [1, 5.3.7.2, Table 9, page 41], @mimeType is mandatory
-                    mime_type = representation_attrib['mimeType']
-                    content_type = mime_type.split('/')[0]
-                    if content_type == 'text':
-                        # TODO implement WebVTT downloading
-                        pass
-                    elif content_type in ('video', 'audio'):
-                        base_url = ''
-                        for element in (representation, adaptation_set, period, mpd_doc):
-                            base_url_e = element.find(_add_ns('BaseURL'))
-                            if base_url_e is not None:
-                                base_url = base_url_e.text + base_url
-                                if re.match(r'^https?://', base_url):
-                                    break
-                        if mpd_base_url and not re.match(r'^https?://', base_url):
-                            if not mpd_base_url.endswith('/') and not base_url.startswith('/'):
-                                mpd_base_url += '/'
-                            base_url = mpd_base_url + base_url
-                        representation_id = representation_attrib.get('id')
-                        lang = representation_attrib.get('lang')
-                        url_el = representation.find(_add_ns('BaseURL'))
-                        filesize = int_or_none(url_el.attrib.get('{http://youtube.com/yt/2012/10/10}contentLength') if url_el is not None else None)
-                        bandwidth = int_or_none(representation_attrib.get('bandwidth'))
-                        f = {
-                            'format_id': '%s-%s' % (mpd_id, representation_id) if mpd_id else representation_id,
-                            'url': base_url,
-                            'manifest_url': mpd_url,
-                            'ext': mimetype2ext(mime_type),
-                            'width': int_or_none(representation_attrib.get('width')),
-                            'height': int_or_none(representation_attrib.get('height')),
-                            'tbr': float_or_none(bandwidth, 1000),
-                            'asr': int_or_none(representation_attrib.get('audioSamplingRate')),
-                            'fps': int_or_none(representation_attrib.get('frameRate')),
-                            'language': lang if lang not in ('mul', 'und', 'zxx', 'mis') else None,
-                            'format_note': 'DASH %s' % content_type,
-                            'filesize': filesize,
-                            'container': mimetype2ext(mime_type) + '_dash',
-                        }
-                        f.update(parse_codecs(representation_attrib.get('codecs')))
-                        representation_ms_info = extract_multisegment_info(representation, adaption_set_ms_info)
-
-                        def prepare_template(template_name, identifiers):
-                            tmpl = representation_ms_info[template_name]
-                            # First of, % characters outside $...$ templates
-                            # must be escaped by doubling for proper processing
-                            # by % operator string formatting used further (see
-                            # https://github.com/rg3/youtube-dl/issues/16867).
-                            t = ''
-                            in_template = False
-                            for c in tmpl:
-                                t += c
-                                if c == '$':
-                                    in_template = not in_template
-                                elif c == '%' and not in_template:
-                                    t += c
-                            # Next, $...$ templates are translated to their
-                            # %(...) counterparts to be used with % operator
-                            t = t.replace('$RepresentationID$', representation_id)
-                            t = re.sub(r'\$(%s)\$' % '|'.join(identifiers), r'%(\1)d', t)
-                            t = re.sub(r'\$(%s)%%([^$]+)\$' % '|'.join(identifiers), r'%(\1)\2', t)
-                            t.replace('$$', '$')
-                            return t
-
-                        # @initialization is a regular template like @media one
-                        # so it should be handled just the same way (see
-                        # https://github.com/rg3/youtube-dl/issues/11605)
-                        if 'initialization' in representation_ms_info:
-                            initialization_template = prepare_template(
-                                'initialization',
-                                # As per [1, 5.3.9.4.2, Table 15, page 54] $Number$ and
-                                # $Time$ shall not be included for @initialization thus
-                                # only $Bandwidth$ remains
-                                ('Bandwidth', ))
-                            representation_ms_info['initialization_url'] = initialization_template % {
-                                'Bandwidth': bandwidth,
-                            }
-
-                        def location_key(location):
-                            return 'url' if re.match(r'^https?://', location) else 'path'
-
-                        if 'segment_urls' not in representation_ms_info and 'media' in representation_ms_info:
-
-                            media_template = prepare_template('media', ('Number', 'Bandwidth', 'Time'))
-                            media_location_key = location_key(media_template)
-
-                            # As per [1, 5.3.9.4.4, Table 16, page 55] $Number$ and $Time$
-                            # can't be used at the same time
-                            if '%(Number' in media_template and 's' not in representation_ms_info:
-                                segment_duration = None
-                                if 'total_number' not in representation_ms_info and 'segment_duration' in representation_ms_info:
-                                    segment_duration = float_or_none(representation_ms_info['segment_duration'], representation_ms_info['timescale'])
-                                    representation_ms_info['total_number'] = int(math.ceil(float(period_duration) / segment_duration))
-                                representation_ms_info['fragments'] = [{
-                                    media_location_key: media_template % {
-                                        'Number': segment_number,
-                                        'Bandwidth': bandwidth,
-                                    },
-                                    'duration': segment_duration,
-                                } for segment_number in range(
-                                    representation_ms_info['start_number'],
-                                    representation_ms_info['total_number'] + representation_ms_info['start_number'])]
-                            else:
-                                # $Number*$ or $Time$ in media template with S list available
-                                # Example $Number*$: http://www.svtplay.se/klipp/9023742/stopptid-om-bjorn-borg
-                                # Example $Time$: https://play.arkena.com/embed/avp/v2/player/media/b41dda37-d8e7-4d3f-b1b5-9a9db578bdfe/1/129411
-                                representation_ms_info['fragments'] = []
-                                segment_time = 0
-                                segment_d = None
-                                segment_number = representation_ms_info['start_number']
-
-                                def add_segment_url():
-                                    segment_url = media_template % {
-                                        'Time': segment_time,
-                                        'Bandwidth': bandwidth,
-                                        'Number': segment_number,
-                                    }
-                                    representation_ms_info['fragments'].append({
-                                        media_location_key: segment_url,
-                                        'duration': float_or_none(segment_d, representation_ms_info['timescale']),
-                                    })
-
-                                for num, s in enumerate(representation_ms_info['s']):
-                                    segment_time = s.get('t') or segment_time
-                                    segment_d = s['d']
-                                    add_segment_url()
-                                    segment_number += 1
-                                    for r in range(s.get('r', 0)):
-                                        segment_time += segment_d
-                                        add_segment_url()
-                                        segment_number += 1
-                                    segment_time += segment_d
-                        elif 'segment_urls' in representation_ms_info and 's' in representation_ms_info:
-                            # No media template
-                            # Example: https://www.youtube.com/watch?v=iXZV5uAYMJI
-                            # or any YouTube dashsegments video
-                            fragments = []
-                            segment_index = 0
-                            timescale = representation_ms_info['timescale']
-                            for s in representation_ms_info['s']:
-                                duration = float_or_none(s['d'], timescale)
-                                for r in range(s.get('r', 0) + 1):
-                                    segment_uri = representation_ms_info['segment_urls'][segment_index]
-                                    fragments.append({
-                                        location_key(segment_uri): segment_uri,
-                                        'duration': duration,
-                                    })
-                                    segment_index += 1
-                            representation_ms_info['fragments'] = fragments
-                        elif 'segment_urls' in representation_ms_info:
-                            # Segment URLs with no SegmentTimeline
-                            # Example: https://www.seznam.cz/zpravy/clanek/cesko-zasahne-vitr-o-sile-vichrice-muze-byt-i-zivotu-nebezpecny-39091
-                            # https://github.com/rg3/youtube-dl/pull/14844
-                            fragments = []
-                            segment_duration = float_or_none(
-                                representation_ms_info['segment_duration'],
-                                representation_ms_info['timescale']) if 'segment_duration' in representation_ms_info else None
-                            for segment_url in representation_ms_info['segment_urls']:
-                                fragment = {
-                                    location_key(segment_url): segment_url,
-                                }
-                                if segment_duration:
-                                    fragment['duration'] = segment_duration
-                                fragments.append(fragment)
-                            representation_ms_info['fragments'] = fragments
-                        # NB: MPD manifest may contain direct URLs to unfragmented media.
-                        # No fragments key is present in this case.
-                        if 'fragments' in representation_ms_info:
-                            f.update({
-                                'fragment_base_url': base_url,
-                                'fragments': [],
-                                'protocol': 'http_dash_segments',
-                            })
-                            if 'initialization_url' in representation_ms_info:
-                                initialization_url = representation_ms_info['initialization_url']
-                                if not f.get('url'):
-                                    f['url'] = initialization_url
-                                f['fragments'].append({location_key(initialization_url): initialization_url})
-                            f['fragments'].extend(representation_ms_info['fragments'])
-                        # According to [1, 5.3.5.2, Table 7, page 35] @id of Representation
-                        # is not necessarily unique within a Period thus formats with
-                        # the same `format_id` are quite possible. There are numerous examples
-                        # of such manifests (see https://github.com/rg3/youtube-dl/issues/15111,
-                        # https://github.com/rg3/youtube-dl/issues/13919)
-                        full_info = formats_dict.get(representation_id, {}).copy()
-                        full_info.update(f)
-                        formats.append(full_info)
-                    else:
-                        self.report_warning('Unknown MIME type %s in DASH manifest' % mime_type)
-        return formats
-
-    def _extract_ism_formats(self, ism_url, video_id, ism_id=None, note=None, errnote=None, fatal=True):
-        res = self._download_xml_handle(
-            ism_url, video_id,
-            note=note or 'Downloading ISM manifest',
-            errnote=errnote or 'Failed to download ISM manifest',
-            fatal=fatal)
-        if res is False:
-            return []
-        ism_doc, urlh = res
-
-        return self._parse_ism_formats(ism_doc, urlh.geturl(), ism_id)
-
-    def _parse_ism_formats(self, ism_doc, ism_url, ism_id=None):
-        """
-        Parse formats from ISM manifest.
-        References:
-         1. [MS-SSTR]: Smooth Streaming Protocol,
-            https://msdn.microsoft.com/en-us/library/ff469518.aspx
-        """
-        if ism_doc.get('IsLive') == 'TRUE' or ism_doc.find('Protection') is not None:
-            return []
-
-        duration = int(ism_doc.attrib['Duration'])
-        timescale = int_or_none(ism_doc.get('TimeScale')) or 10000000
-
-        formats = []
-        for stream in ism_doc.findall('StreamIndex'):
-            stream_type = stream.get('Type')
-            if stream_type not in ('video', 'audio'):
-                continue
-            url_pattern = stream.attrib['Url']
-            stream_timescale = int_or_none(stream.get('TimeScale')) or timescale
-            stream_name = stream.get('Name')
-            for track in stream.findall('QualityLevel'):
-                fourcc = track.get('FourCC', 'AACL' if track.get('AudioTag') == '255' else None)
-                # TODO: add support for WVC1 and WMAP
-                if fourcc not in ('H264', 'AVC1', 'AACL'):
-                    self.report_warning('%s is not a supported codec' % fourcc)
-                    continue
-                tbr = int(track.attrib['Bitrate']) // 1000
-                # [1] does not mention Width and Height attributes. However,
-                # they're often present while MaxWidth and MaxHeight are
-                # missing, so should be used as fallbacks
-                width = int_or_none(track.get('MaxWidth') or track.get('Width'))
-                height = int_or_none(track.get('MaxHeight') or track.get('Height'))
-                sampling_rate = int_or_none(track.get('SamplingRate'))
-
-                track_url_pattern = re.sub(r'{[Bb]itrate}', track.attrib['Bitrate'], url_pattern)
-                track_url_pattern = compat_urlparse.urljoin(ism_url, track_url_pattern)
-
-                fragments = []
-                fragment_ctx = {
-                    'time': 0,
-                }
-                stream_fragments = stream.findall('c')
-                for stream_fragment_index, stream_fragment in enumerate(stream_fragments):
-                    fragment_ctx['time'] = int_or_none(stream_fragment.get('t')) or fragment_ctx['time']
-                    fragment_repeat = int_or_none(stream_fragment.get('r')) or 1
-                    fragment_ctx['duration'] = int_or_none(stream_fragment.get('d'))
-                    if not fragment_ctx['duration']:
-                        try:
-                            next_fragment_time = int(stream_fragment[stream_fragment_index + 1].attrib['t'])
-                        except IndexError:
-                            next_fragment_time = duration
-                        fragment_ctx['duration'] = (next_fragment_time - fragment_ctx['time']) / fragment_repeat
-                    for _ in range(fragment_repeat):
-                        fragments.append({
-                            'url': re.sub(r'{start[ _]time}', compat_str(fragment_ctx['time']), track_url_pattern),
-                            'duration': fragment_ctx['duration'] / stream_timescale,
-                        })
-                        fragment_ctx['time'] += fragment_ctx['duration']
-
-                format_id = []
-                if ism_id:
-                    format_id.append(ism_id)
-                if stream_name:
-                    format_id.append(stream_name)
-                format_id.append(compat_str(tbr))
-
-                formats.append({
-                    'format_id': '-'.join(format_id),
-                    'url': ism_url,
-                    'manifest_url': ism_url,
-                    'ext': 'ismv' if stream_type == 'video' else 'isma',
-                    'width': width,
-                    'height': height,
-                    'tbr': tbr,
-                    'asr': sampling_rate,
-                    'vcodec': 'none' if stream_type == 'audio' else fourcc,
-                    'acodec': 'none' if stream_type == 'video' else fourcc,
-                    'protocol': 'ism',
-                    'fragments': fragments,
-                    '_download_params': {
-                        'duration': duration,
-                        'timescale': stream_timescale,
-                        'width': width or 0,
-                        'height': height or 0,
-                        'fourcc': fourcc,
-                        'codec_private_data': track.get('CodecPrivateData'),
-                        'sampling_rate': sampling_rate,
-                        'channels': int_or_none(track.get('Channels', 2)),
-                        'bits_per_sample': int_or_none(track.get('BitsPerSample', 16)),
-                        'nal_unit_length_field': int_or_none(track.get('NALUnitLengthField', 4)),
-                    },
-                })
-        return formats
-
-    def _parse_html5_media_entries(self, base_url, webpage, video_id, m3u8_id=None, m3u8_entry_protocol='m3u8', mpd_id=None, preference=None):
-        def absolute_url(item_url):
-            return urljoin(base_url, item_url)
-
-        def parse_content_type(content_type):
-            if not content_type:
-                return {}
-            ctr = re.search(r'(?P<mimetype>[^/]+/[^;]+)(?:;\s*codecs="?(?P<codecs>[^"]+))?', content_type)
-            if ctr:
-                mimetype, codecs = ctr.groups()
-                f = parse_codecs(codecs)
-                f['ext'] = mimetype2ext(mimetype)
-                return f
-            return {}
-
-        def _media_formats(src, cur_media_type, type_info={}):
-            full_url = absolute_url(src)
-            ext = type_info.get('ext') or determine_ext(full_url)
-            if ext == 'm3u8':
-                is_plain_url = False
-                formats = self._extract_m3u8_formats(
-                    full_url, video_id, ext='mp4',
-                    entry_protocol=m3u8_entry_protocol, m3u8_id=m3u8_id,
-                    preference=preference, fatal=False)
-            elif ext == 'mpd':
-                is_plain_url = False
-                formats = self._extract_mpd_formats(
-                    full_url, video_id, mpd_id=mpd_id, fatal=False)
-            else:
-                is_plain_url = True
-                formats = [{
-                    'url': full_url,
-                    'vcodec': 'none' if cur_media_type == 'audio' else None,
-                }]
-            return is_plain_url, formats
-
-        entries = []
-        # amp-video and amp-audio are very similar to their HTML5 counterparts
-        # so we wll include them right here (see
-        # https://www.ampproject.org/docs/reference/components/amp-video)
-        media_tags = [(media_tag, media_type, '')
-                      for media_tag, media_type
-                      in re.findall(r'(?s)(<(?:amp-)?(video|audio)[^>]*/>)', webpage)]
-        media_tags.extend(re.findall(
-            # We only allow video|audio followed by a whitespace or '>'.
-            # Allowing more characters may end up in significant slow down (see
-            # https://github.com/rg3/youtube-dl/issues/11979, example URL:
-            # http://www.porntrex.com/maps/videositemap.xml).
-            r'(?s)(<(?P<tag>(?:amp-)?(?:video|audio))(?:\s+[^>]*)?>)(.*?)</(?P=tag)>', webpage))
-        for media_tag, media_type, media_content in media_tags:
-            media_info = {
-                'formats': [],
-                'subtitles': {},
-            }
-            media_attributes = extract_attributes(media_tag)
-            src = media_attributes.get('src')
-            if src:
-                _, formats = _media_formats(src, media_type)
-                media_info['formats'].extend(formats)
-            media_info['thumbnail'] = absolute_url(media_attributes.get('poster'))
-            if media_content:
-                for source_tag in re.findall(r'<source[^>]+>', media_content):
-                    source_attributes = extract_attributes(source_tag)
-                    src = source_attributes.get('src')
-                    if not src:
-                        continue
-                    f = parse_content_type(source_attributes.get('type'))
-                    is_plain_url, formats = _media_formats(src, media_type, f)
-                    if is_plain_url:
-                        # res attribute is not standard but seen several times
-                        # in the wild
-                        f.update({
-                            'height': int_or_none(source_attributes.get('res')),
-                            'format_id': source_attributes.get('label'),
-                        })
-                        f.update(formats[0])
-                        media_info['formats'].append(f)
-                    else:
-                        media_info['formats'].extend(formats)
-                for track_tag in re.findall(r'<track[^>]+>', media_content):
-                    track_attributes = extract_attributes(track_tag)
-                    kind = track_attributes.get('kind')
-                    if not kind or kind in ('subtitles', 'captions'):
-                        src = track_attributes.get('src')
-                        if not src:
-                            continue
-                        lang = track_attributes.get('srclang') or track_attributes.get('lang') or track_attributes.get('label')
-                        media_info['subtitles'].setdefault(lang, []).append({
-                            'url': absolute_url(src),
-                        })
-            for f in media_info['formats']:
-                f.setdefault('http_headers', {})['Referer'] = base_url
-            if media_info['formats'] or media_info['subtitles']:
-                entries.append(media_info)
-        return entries
-
-    def _extract_akamai_formats(self, manifest_url, video_id, hosts={}):
-        formats = []
-        hdcore_sign = 'hdcore=3.7.0'
-        f4m_url = re.sub(r'(https?://[^/]+)/i/', r'\1/z/', manifest_url).replace('/master.m3u8', '/manifest.f4m')
-        hds_host = hosts.get('hds')
-        if hds_host:
-            f4m_url = re.sub(r'(https?://)[^/]+', r'\1' + hds_host, f4m_url)
-        if 'hdcore=' not in f4m_url:
-            f4m_url += ('&' if '?' in f4m_url else '?') + hdcore_sign
-        f4m_formats = self._extract_f4m_formats(
-            f4m_url, video_id, f4m_id='hds', fatal=False)
-        for entry in f4m_formats:
-            entry.update({'extra_param_to_segment_url': hdcore_sign})
-        formats.extend(f4m_formats)
-        m3u8_url = re.sub(r'(https?://[^/]+)/z/', r'\1/i/', manifest_url).replace('/manifest.f4m', '/master.m3u8')
-        hls_host = hosts.get('hls')
-        if hls_host:
-            m3u8_url = re.sub(r'(https?://)[^/]+', r'\1' + hls_host, m3u8_url)
-        formats.extend(self._extract_m3u8_formats(
-            m3u8_url, video_id, 'mp4', 'm3u8_native',
-            m3u8_id='hls', fatal=False))
-        return formats
-
-    def _extract_wowza_formats(self, url, video_id, m3u8_entry_protocol='m3u8_native', skip_protocols=[]):
-        query = compat_urlparse.urlparse(url).query
-        url = re.sub(r'/(?:manifest|playlist|jwplayer)\.(?:m3u8|f4m|mpd|smil)', '', url)
-        mobj = re.search(
-            r'(?:(?:http|rtmp|rtsp)(?P<s>s)?:)?(?P<url>//[^?]+)', url)
-        url_base = mobj.group('url')
-        http_base_url = '%s%s:%s' % ('http', mobj.group('s') or '', url_base)
-        formats = []
-
-        def manifest_url(manifest):
-            m_url = '%s/%s' % (http_base_url, manifest)
-            if query:
-                m_url += '?%s' % query
-            return m_url
-
-        if 'm3u8' not in skip_protocols:
-            formats.extend(self._extract_m3u8_formats(
-                manifest_url('playlist.m3u8'), video_id, 'mp4',
-                m3u8_entry_protocol, m3u8_id='hls', fatal=False))
-        if 'f4m' not in skip_protocols:
-            formats.extend(self._extract_f4m_formats(
-                manifest_url('manifest.f4m'),
-                video_id, f4m_id='hds', fatal=False))
-        if 'dash' not in skip_protocols:
-            formats.extend(self._extract_mpd_formats(
-                manifest_url('manifest.mpd'),
-                video_id, mpd_id='dash', fatal=False))
-        if re.search(r'(?:/smil:|\.smil)', url_base):
-            if 'smil' not in skip_protocols:
-                rtmp_formats = self._extract_smil_formats(
-                    manifest_url('jwplayer.smil'),
-                    video_id, fatal=False)
-                for rtmp_format in rtmp_formats:
-                    rtsp_format = rtmp_format.copy()
-                    rtsp_format['url'] = '%s/%s' % (rtmp_format['url'], rtmp_format['play_path'])
-                    del rtsp_format['play_path']
-                    del rtsp_format['ext']
-                    rtsp_format.update({
-                        'url': rtsp_format['url'].replace('rtmp://', 'rtsp://'),
-                        'format_id': rtmp_format['format_id'].replace('rtmp', 'rtsp'),
-                        'protocol': 'rtsp',
-                    })
-                    formats.extend([rtmp_format, rtsp_format])
-        else:
-            for protocol in ('rtmp', 'rtsp'):
-                if protocol not in skip_protocols:
-                    formats.append({
-                        'url': '%s:%s' % (protocol, url_base),
-                        'format_id': protocol,
-                        'protocol': protocol,
-                    })
-        return formats
-
-    def _find_jwplayer_data(self, webpage, video_id=None, transform_source=js_to_json):
-        mobj = re.search(
-            r'(?s)jwplayer\((?P<quote>[\'"])[^\'" ]+(?P=quote)\)(?!</script>).*?\.setup\s*\((?P<options>[^)]+)\)',
-            webpage)
-        if mobj:
-            try:
-                jwplayer_data = self._parse_json(mobj.group('options'),
-                                                 video_id=video_id,
-                                                 transform_source=transform_source)
-            except ExtractorError:
-                pass
-            else:
-                if isinstance(jwplayer_data, dict):
-                    return jwplayer_data
-
-    def _extract_jwplayer_data(self, webpage, video_id, *args, **kwargs):
-        jwplayer_data = self._find_jwplayer_data(
-            webpage, video_id, transform_source=js_to_json)
-        return self._parse_jwplayer_data(
-            jwplayer_data, video_id, *args, **kwargs)
-
-    def _parse_jwplayer_data(self, jwplayer_data, video_id=None, require_title=True,
-                             m3u8_id=None, mpd_id=None, rtmp_params=None, base_url=None):
-        # JWPlayer backward compatibility: flattened playlists
-        # https://github.com/jwplayer/jwplayer/blob/v7.4.3/src/js/api/config.js#L81-L96
-        if 'playlist' not in jwplayer_data:
-            jwplayer_data = {'playlist': [jwplayer_data]}
-
-        entries = []
-
-        # JWPlayer backward compatibility: single playlist item
-        # https://github.com/jwplayer/jwplayer/blob/v7.7.0/src/js/playlist/playlist.js#L10
-        if not isinstance(jwplayer_data['playlist'], list):
-            jwplayer_data['playlist'] = [jwplayer_data['playlist']]
-
-        for video_data in jwplayer_data['playlist']:
-            # JWPlayer backward compatibility: flattened sources
-            # https://github.com/jwplayer/jwplayer/blob/v7.4.3/src/js/playlist/item.js#L29-L35
-            if 'sources' not in video_data:
-                video_data['sources'] = [video_data]
-
-            this_video_id = video_id or video_data['mediaid']
-
-            formats = self._parse_jwplayer_formats(
-                video_data['sources'], video_id=this_video_id, m3u8_id=m3u8_id,
-                mpd_id=mpd_id, rtmp_params=rtmp_params, base_url=base_url)
-
-            subtitles = {}
-            tracks = video_data.get('tracks')
-            if tracks and isinstance(tracks, list):
-                for track in tracks:
-                    if not isinstance(track, dict):
-                        continue
-                    track_kind = track.get('kind')
-                    if not track_kind or not isinstance(track_kind, compat_str):
-                        continue
-                    if track_kind.lower() not in ('captions', 'subtitles'):
-                        continue
-                    track_url = urljoin(base_url, track.get('file'))
-                    if not track_url:
-                        continue
-                    subtitles.setdefault(track.get('label') or 'en', []).append({
-                        'url': self._proto_relative_url(track_url)
-                    })
-
-            entry = {
-                'id': this_video_id,
-                'title': unescapeHTML(video_data['title'] if require_title else video_data.get('title')),
-                'description': video_data.get('description'),
-                'thumbnail': self._proto_relative_url(video_data.get('image')),
-                'timestamp': int_or_none(video_data.get('pubdate')),
-                'duration': float_or_none(jwplayer_data.get('duration') or video_data.get('duration')),
-                'subtitles': subtitles,
-            }
-            # https://github.com/jwplayer/jwplayer/blob/master/src/js/utils/validator.js#L32
-            if len(formats) == 1 and re.search(r'^(?:http|//).*(?:youtube\.com|youtu\.be)/.+', formats[0]['url']):
-                entry.update({
-                    '_type': 'url_transparent',
-                    'url': formats[0]['url'],
-                })
-            else:
-                self._sort_formats(formats)
-                entry['formats'] = formats
-            entries.append(entry)
-        if len(entries) == 1:
-            return entries[0]
-        else:
-            return self.playlist_result(entries)
-
-    def _parse_jwplayer_formats(self, jwplayer_sources_data, video_id=None,
-                                m3u8_id=None, mpd_id=None, rtmp_params=None, base_url=None):
-        urls = []
-        formats = []
-        for source in jwplayer_sources_data:
-            if not isinstance(source, dict):
-                continue
-            source_url = self._proto_relative_url(source.get('file'))
-            if not source_url:
-                continue
-            if base_url:
-                source_url = compat_urlparse.urljoin(base_url, source_url)
-            if source_url in urls:
-                continue
-            urls.append(source_url)
-            source_type = source.get('type') or ''
-            ext = mimetype2ext(source_type) or determine_ext(source_url)
-            if source_type == 'hls' or ext == 'm3u8':
-                formats.extend(self._extract_m3u8_formats(
-                    source_url, video_id, 'mp4', entry_protocol='m3u8_native',
-                    m3u8_id=m3u8_id, fatal=False))
-            elif source_type == 'dash' or ext == 'mpd':
-                formats.extend(self._extract_mpd_formats(
-                    source_url, video_id, mpd_id=mpd_id, fatal=False))
-            elif ext == 'smil':
-                formats.extend(self._extract_smil_formats(
-                    source_url, video_id, fatal=False))
-            # https://github.com/jwplayer/jwplayer/blob/master/src/js/providers/default.js#L67
-            elif source_type.startswith('audio') or ext in (
-                    'oga', 'aac', 'mp3', 'mpeg', 'vorbis'):
-                formats.append({
-                    'url': source_url,
-                    'vcodec': 'none',
-                    'ext': ext,
-                })
-            else:
-                height = int_or_none(source.get('height'))
-                if height is None:
-                    # Often no height is provided but there is a label in
-                    # format like "1080p", "720p SD", or 1080.
-                    height = int_or_none(self._search_regex(
-                        r'^(\d{3,4})[pP]?(?:\b|$)', compat_str(source.get('label') or ''),
-                        'height', default=None))
-                a_format = {
-                    'url': source_url,
-                    'width': int_or_none(source.get('width')),
-                    'height': height,
-                    'tbr': int_or_none(source.get('bitrate')),
-                    'ext': ext,
-                }
-                if source_url.startswith('rtmp'):
-                    a_format['ext'] = 'flv'
-                    # See com/longtailvideo/jwplayer/media/RTMPMediaProvider.as
-                    # of jwplayer.flash.swf
-                    rtmp_url_parts = re.split(
-                        r'((?:mp4|mp3|flv):)', source_url, 1)
-                    if len(rtmp_url_parts) == 3:
-                        rtmp_url, prefix, play_path = rtmp_url_parts
-                        a_format.update({
-                            'url': rtmp_url,
-                            'play_path': prefix + play_path,
-                        })
-                    if rtmp_params:
-                        a_format.update(rtmp_params)
-                formats.append(a_format)
-        return formats
-
-    def _live_title(self, name):
-        """ Generate the title for a live video """
-        now = datetime.datetime.now()
-        now_str = now.strftime('%Y-%m-%d %H:%M')
-        return name + ' ' + now_str
-
-    def _int(self, v, name, fatal=False, **kwargs):
-        res = int_or_none(v, **kwargs)
-        if 'get_attr' in kwargs:
-            print(getattr(v, kwargs['get_attr']))
-        if res is None:
-            msg = 'Failed to extract %s: Could not parse value %r' % (name, v)
-            if fatal:
-                raise ExtractorError(msg)
-            else:
-                self._downloader.report_warning(msg)
-        return res
-
-    def _float(self, v, name, fatal=False, **kwargs):
-        res = float_or_none(v, **kwargs)
-        if res is None:
-            msg = 'Failed to extract %s: Could not parse value %r' % (name, v)
-            if fatal:
-                raise ExtractorError(msg)
-            else:
-                self._downloader.report_warning(msg)
-        return res
-
-    def _set_cookie(self, domain, name, value, expire_time=None, port=None,
-                    path='/', secure=False, discard=False, rest={}, **kwargs):
-        cookie = compat_cookiejar.Cookie(
-            0, name, value, port, port is not None, domain, True,
-            domain.startswith('.'), path, True, secure, expire_time,
-            discard, None, None, rest)
-        self._downloader.cookiejar.set_cookie(cookie)
-
-    def _get_cookies(self, url):
-        """ Return a compat_cookies.SimpleCookie with the cookies for the url """
-        req = sanitized_Request(url)
-        self._downloader.cookiejar.add_cookie_header(req)
-        return compat_cookies.SimpleCookie(req.get_header('Cookie'))
-
-    def get_testcases(self, include_onlymatching=False):
-        t = getattr(self, '_TEST', None)
-        if t:
-            assert not hasattr(self, '_TESTS'), \
-                '%s has _TEST and _TESTS' % type(self).__name__
-            tests = [t]
-        else:
-            tests = getattr(self, '_TESTS', [])
-        for t in tests:
-            if not include_onlymatching and t.get('only_matching', False):
-                continue
-            t['name'] = type(self).__name__[:-len('IE')]
-            yield t
-
-    def is_suitable(self, age_limit):
-        """ Test whether the extractor is generally suitable for the given
-        age limit (i.e. pornographic sites are not, all others usually are) """
-
-        any_restricted = False
-        for tc in self.get_testcases(include_onlymatching=False):
-            if tc.get('playlist', []):
-                tc = tc['playlist'][0]
-            is_restricted = age_restricted(
-                tc.get('info_dict', {}).get('age_limit'), age_limit)
-            if not is_restricted:
-                return True
-            any_restricted = any_restricted or is_restricted
-        return not any_restricted
-
-    def extract_subtitles(self, *args, **kwargs):
-        if (self._downloader.params.get('writesubtitles', False) or
-                self._downloader.params.get('listsubtitles')):
-            return self._get_subtitles(*args, **kwargs)
-        return {}
-
-    def _get_subtitles(self, *args, **kwargs):
-        raise NotImplementedError('This method must be implemented by subclasses')
-
-    @staticmethod
-    def _merge_subtitle_items(subtitle_list1, subtitle_list2):
-        """ Merge subtitle items for one language. Items with duplicated URLs
-        will be dropped. """
-        list1_urls = set([item['url'] for item in subtitle_list1])
-        ret = list(subtitle_list1)
-        ret.extend([item for item in subtitle_list2 if item['url'] not in list1_urls])
-        return ret
-
-    @classmethod
-    def _merge_subtitles(cls, subtitle_dict1, subtitle_dict2):
-        """ Merge two subtitle dictionaries, language by language. """
-        ret = dict(subtitle_dict1)
-        for lang in subtitle_dict2:
-            ret[lang] = cls._merge_subtitle_items(subtitle_dict1.get(lang, []), subtitle_dict2[lang])
-        return ret
-
-    def extract_automatic_captions(self, *args, **kwargs):
-        if (self._downloader.params.get('writeautomaticsub', False) or
-                self._downloader.params.get('listsubtitles')):
-            return self._get_automatic_captions(*args, **kwargs)
-        return {}
-
-    def _get_automatic_captions(self, *args, **kwargs):
-        raise NotImplementedError('This method must be implemented by subclasses')
-
-    def mark_watched(self, *args, **kwargs):
-        if (self._downloader.params.get('mark_watched', False) and
-                (self._get_login_info()[0] is not None or
-                    self._downloader.params.get('cookiefile') is not None)):
-            self._mark_watched(*args, **kwargs)
-
-    def _mark_watched(self, *args, **kwargs):
-        raise NotImplementedError('This method must be implemented by subclasses')
-
-    def geo_verification_headers(self):
-        headers = {}
-        geo_verification_proxy = self._downloader.params.get('geo_verification_proxy')
-        if geo_verification_proxy:
-            headers['Ytdl-request-proxy'] = geo_verification_proxy
-        return headers
-
-    def _generic_id(self, url):
-        return compat_urllib_parse_unquote(os.path.splitext(url.rstrip('/').split('/')[-1])[0])
-
-    def _generic_title(self, url):
-        return compat_urllib_parse_unquote(os.path.splitext(url_basename(url))[0])
-
-
-class SearchInfoExtractor(InfoExtractor):
-    """
-    Base class for paged search queries extractors.
-    They accept URLs in the format _SEARCH_KEY(|all|[0-9]):{query}
-    Instances should define _SEARCH_KEY and _MAX_RESULTS.
-    """
-
-    @classmethod
-    def _make_valid_url(cls):
-        return r'%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\s\S]+)' % cls._SEARCH_KEY
-
-    @classmethod
-    def suitable(cls, url):
-        return re.match(cls._make_valid_url(), url) is not None
-
-    def _real_extract(self, query):
-        mobj = re.match(self._make_valid_url(), query)
-        if mobj is None:
-            raise ExtractorError('Invalid search query "%s"' % query)
-
-        prefix = mobj.group('prefix')
-        query = mobj.group('query')
-        if prefix == '':
-            return self._get_n_results(query, 1)
-        elif prefix == 'all':
-            return self._get_n_results(query, self._MAX_RESULTS)
-        else:
-            n = int(prefix)
-            if n <= 0:
-                raise ExtractorError('invalid download number %s for query "%s"' % (n, query))
-            elif n > self._MAX_RESULTS:
-                self._downloader.report_warning('%s returns max %i results (you requested %i)' % (self._SEARCH_KEY, self._MAX_RESULTS, n))
-                n = self._MAX_RESULTS
-            return self._get_n_results(query, n)
-
-    def _get_n_results(self, query, n):
-        """Get a specified number of results for a query"""
-        raise NotImplementedError('This method must be implemented by subclasses')
-
-    @property
-    def SEARCH_KEY(self):
-        return self._SEARCH_KEY