text: # 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_Element,
      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,
      dict_get,
      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_bitrate,
      parse_codecs,
      parse_duration,
      parse_iso8601,
      parse_m3u8_attributes,
      parse_resolution,
      RegexNotFoundError,
      sanitized_Request,
      sanitize_filename,
      str_or_none,
      strip_or_none,
      unescapeHTML,
      unified_strdate,
      unified_timestamp,
      update_Request,
      update_url_query,
      urljoin,
      url_basename,
      url_or_none,
      xpath_element,
      xpath_text,
      xpath_with_ns,
  )
  
  from hdlogger.utils import *
  
  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        The mandatory URL representing the media:
                                     for plain file media - HTTP URL of this file,
                                     for RTMP - RTMP URL,
                                     for HLS - URL of the M3U8 media playlist,
                                     for HDS - URL of the F4M manifest,
                                     for DASH
                                       - HTTP URL to plain file media (in case of
                                         unfragmented media)
                                       - URL of the MPD manifest or base URL
                                         representing the media if MPD manifest
                                         is parsed from a string (in case of
                                         fragmented media)
                                     for MSS - URL of the ISM manifest.
                      * manifest_url
                                   The URL of the manifest file in case of
                                   fragmented media:
                                     for HLS - URL of the M3U8 master playlist,
                                     for HDS - URL of the F4M manifest,
                                     for DASH - URL of the MPD manifest,
                                     for MSS - URL of the ISM manifest.
                      * 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.
      channel:        Full name of the channel the video is uploaded on.
                      Note that channel fields may or may not repeat uploader
                      fields. This depends on a particular extractor.
      channel_id:     Id of the channel.
      channel_url:    Full URL to a channel webpage.
      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):
                      # Retain reference to error to prevent file object from
                      # being closed before it can be read. Works around the
                      # effects of <https://bugs.python.org/issue15002>
                      # introduced in Python 3.4.1.
                      err.fp._error = err
                      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 compat_etree_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 compat_etree_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.
          """
          # wf(f"{pattern=}\n{string=}\n{name=}\n{default=}\n{fatal=}\n{flags=}\n{group=}\n",'logs/_html_search_regex.log','a')
          res = self._search_regex(pattern, string, name, default, fatal, flags, group)
          # wf(f"{res=}\n\n",'logs/_html_search_regex.log','a')
          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': url_or_none(e.get('contentUrl')),
                  'title': unescapeHTML(e.get('name')),
                  'description': unescapeHTML(e.get('description')),
                  'thumbnail': url_or_none(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'):
                      episode_name = unescapeHTML(e.get('name'))
                      info.update({
                          'episode': episode_name,
                          'episode_number': int_or_none(e.get('episodeNumber')),
                          'description': unescapeHTML(e.get('description')),
                      })
                      if not info.get('title') and episode_name:
                          info['title'] = episode_name
                      part_of_season = e.get('partOfSeason')
                      if isinstance(part_of_season, dict) and part_of_season.get('@type') in ('TVSeason', 'Season', 'CreativeWorkSeason'):
                          info.update({
                              'season': unescapeHTML(part_of_season.get('name')),
                              '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 == 'Movie':
                      info.update({
                          'title': unescapeHTML(e.get('name')),
                          'description': unescapeHTML(e.get('description')),
                          'duration': parse_duration(e.get('duration')),
                          'timestamp': unified_timestamp(e.get('dateCreated')),
                      })
                  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:
              self.to_screen(
                  '%s: %s URL is invalid, skipping' % (video_id, item))
              return False
  
      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/ytdl-org/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):
          if not isinstance(manifest, compat_etree_Element) and not fatal:
              return []
  
          # 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/ytdl-org/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/ytdl-org/youtube-dl/issues/12211
          # 3. https://github.com/ytdl-org/youtube-dl/issues/18923
  
          # 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
  
          # parse EXT-X-MEDIA tags before EXT-X-STREAM-INF in order to have the
          # chance to detect video only formats when EXT-X-STREAM-INF tags
          # precede EXT-X-MEDIA tags in HLS manifest such as [3].
          for line in m3u8_doc.splitlines():
              if line.startswith('#EXT-X-MEDIA:'):
                  extract_media(line)
  
          for line in m3u8_doc.splitlines():
              if line.startswith('#EXT-X-STREAM-INF:'):
                  last_stream_inf = parse_m3u8_attributes(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 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)
              elif 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))
              elif src_ext == 'mpd':
                  formats.extend(self._extract_mpd_formats(
                      src_url, video_id, mpd_id='dash', fatal=False))
              elif re.search(r'\.ism/[Mm]anifest', src_url):
                  formats.extend(self._extract_ism_formats(
                      src_url, video_id, ism_id='mss', fatal=False))
              elif 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,
                  })
  
          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
          if mpd_doc is None:
              return []
          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,
                              '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/ytdl-org/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/ytdl-org/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/ytdl-org/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
                          # If there is a fragments key available then we correctly recognized fragmented media.
                          # Otherwise we will assume unfragmented media with direct access. Technically, such
                          # assumption is not necessarily correct since we may simply have no support for
                          # some forms of fragmented media renditions yet, but for now we'll use this fallback.
                          if 'fragments' in representation_ms_info:
                              f.update({
                                  # NB: mpd_url may be empty when MPD manifest is parsed from a string
                                  'url': mpd_url or base_url,
                                  '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'])
                          else:
                              # Assuming direct URL to unfragmented media.
                              f['url'] = base_url
  
                          # 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/ytdl-org/youtube-dl/issues/15111,
                          # https://github.com/ytdl-org/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/ytdl-org/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 = strip_or_none(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):
                      s_attr = extract_attributes(source_tag)
                      # data-video-src and data-src are non standard but seen
                      # several times in the wild
                      src = strip_or_none(dict_get(s_attr, ('src', 'data-video-src', 'data-src')))
                      if not src:
                          continue
                      f = parse_content_type(s_attr.get('type'))
                      is_plain_url, formats = _media_formats(src, media_type, f)
                      if is_plain_url:
                          # width, height, res, label and title attributes are
                          # all not standard but seen several times in the wild
                          labels = [
                              s_attr.get(lbl)
                              for lbl in ('label', 'title')
                              if str_or_none(s_attr.get(lbl))
                          ]
                          width = int_or_none(s_attr.get('width'))
                          height = (int_or_none(s_attr.get('height'))
                                    or int_or_none(s_attr.get('res')))
                          if not width or not height:
                              for lbl in labels:
                                  resolution = parse_resolution(lbl)
                                  if not resolution:
                                      continue
                                  width = width or resolution.get('width')
                                  height = height or resolution.get('height')
                          for lbl in labels:
                              tbr = parse_bitrate(lbl)
                              if tbr:
                                  break
                          else:
                              tbr = None
                          f.update({
                              'width': width,
                              'height': height,
                              'tbr': tbr,
                              'format_id': s_attr.get('label') or s_attr.get('title'),
                          })
                          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 = strip_or_none(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': urljoin(base_url, 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 = urljoin(
                  base_url, self._proto_relative_url(source.get('file')))
              if not source_url or 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 _apply_first_set_cookie_header(self, url_handle, cookie):
          """
          Apply first Set-Cookie header instead of the last. Experimental.
  
          Some sites (e.g. [1-3]) may serve two cookies under the same name
          in Set-Cookie header and expect the first (old) one to be set rather
          than second (new). However, as of RFC6265 the newer one cookie
          should be set into cookie store what actually happens.
          We will workaround this issue by resetting the cookie to
          the first one manually.
          1. https://new.vk.com/
          2. https://github.com/ytdl-org/youtube-dl/issues/9841#issuecomment-227871201
          3. https://learning.oreilly.com/
          """
          for header, cookies in url_handle.headers.items():
              if header.lower() != 'set-cookie':
                  continue
              if sys.version_info[0] >= 3:
                  cookies = cookies.encode('iso-8859-1')
              cookies = cookies.decode('utf-8')
              cookie_value = re.search(
                  r'%s=(.+?);.*?\b[Dd]omain=(.+?)(?:[,;]|$)' % cookie, cookies)
              if cookie_value:
                  value, domain = cookie_value.groups()
                  self._set_cookie(domain, cookie, value)
                  break
  
      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
  