YouTube: Signature extraction failed (unable to extract html5 player)

[marburger93]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.03.01
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

# ./youtube-dl -v -4 L4WuwwCNbS4
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-4', u'L4WuwwCNbS4']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.03.01
[debug] Python version 2.7.9 (CPython) - Linux-4.9.182-xxxx-std-ipv6-64-x86_64-with-Debian-7
[debug] exe versions: avconv 11.12-6, avprobe 11.12-6, ffmpeg N-48007-g62f8d27ef1-static
[debug] Proxy map: {}
[youtube] L4WuwwCNbS4: Downloading webpage
[youtube] L4WuwwCNbS4: Downloading embed webpage
[youtube] L4WuwwCNbS4: Refetching age-gated info webpage
WARNING: unable to extract html5 player; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
[youtube] {18} signature length 110, html5 player None
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1385, in _decrypt_signature
    video_id, player_url, s
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1262, in _extract_signature_function
    raise ExtractorError('Cannot identify player %r' % player_url)
ExtractorError: Cannot identify player u'https://www.youtube.com/s/player/5168268b/player_ias.vflset/en_US/base.js'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by ExtractorError(u"Cannot identify player u'https://www.youtube.com/s/player/5168268b/player_ias.vflset/en_US/base.js'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.",)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1385, in _decrypt_signature
    video_id, player_url, s
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1262, in _extract_signature_function
    raise ExtractorError('Cannot identify player %r' % player_url)
ExtractorError: Cannot identify player u'https://www.youtube.com/s/player/5168268b/player_ias.vflset/en_US/base.js'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 797, in extract_info
    ie_result = ie.extract(url)
  File "./youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 2048, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1395, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1385, in _decrypt_signature
    video_id, player_url, s
  File "./youtube-dl/youtube_dl/extractor/youtube.py", line 1262, in _extract_signature_function
    raise ExtractorError('Cannot identify player %r' % player_url)
ExtractorError: Cannot identify player u'https://www.youtube.com/s/player/5168268b/player_ias.vflset/en_US/base.js'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by ExtractorError(u"Cannot identify player u'https://www.youtube.com/s/player/5168268b/player_ias.vflset/en_US/base.js'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.",)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description

I get this error message with some YouTube videos but I haven't figured out why this videos don't work. The videos can be played in the browser.

• https://www.youtube.com/watch?v=L4WuwwCNbS4
• https://www.youtube.com/watch?v=s2KPYs-4hww
• https://www.youtube.com/watch?v=lPYXtsHgYvM
• https://www.youtube.com/watch?v=P7dtLmwt6PY