[Bug Report] RegexNotFoundError: Unable to extract Initial JS player signature function name

[TommyJerryMairo]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.11.07. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2018.11.07

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

---

If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--cookies', 'cookie', 'https://www.youtube.com/watch?v=BGoYFpHG0lg', '-F', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.11.03
[debug] Python version 3.7.1 (CPython) - Linux-4.19.0-arch1-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg n4.1, ffprobe n4.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] BGoYFpHG0lg: Downloading webpage
[youtube] J1T-RXFVbLo: Downloading webpage
[youtube] J1T-RXFVbLo: Downloading video info webpage
[youtube] {22} signature length 41.41, html5 player vfls4aurX
[youtube] J1T-RXFVbLo: Downloading player https://www.youtube.com/yts/jsbin/player-vfls4aurX/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1221, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1130, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1193, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by RegexNotFoundError('Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how 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; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1221, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1130, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1193, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1221, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1130, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1193, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/youtube_dl/YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 508, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1814, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1231, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1221, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1130, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1193, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by RegexNotFoundError('Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how 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; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

[Hrxn]

Outdated version.