RegexNotFoundError: Unable to extract Initial JS player signature function name

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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:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

youtube-dl -v https://www.youtube.com/watch?v=R__WfTD8rJs
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.youtube.com/watch?v=R__WfTD8rJs']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.03.03
[debug] Python version 3.5.3 (CPython) - Linux-4.9.59-v7+-armv7l-with-debian-9.4
[debug] exe versions: avconv 3.2.10-1, avprobe 3.2.10-1, ffmpeg N-89740-g476665d4de, ffprobe N-89740-g476665d4de
[debug] Proxy map: {}
[youtube] R__WfTD8rJs: Downloading webpage
[youtube] R__WfTD8rJs: Downloading video info webpage
[youtube] R__WfTD8rJs: Extracting video information
[youtube] {18} signature length 42.42, html5 player vfluVXjLS
[youtube] R__WfTD8rJs: Downloading player https://www.youtube.com/yts/jsbin/player-vfluVXjLS/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 796, 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 \x1b[0;34mInitial JS player signature function name\x1b[0m; 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 "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 796, 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 "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 796, 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 "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 785, in extract_info
    ie_result = ie.extract(url)
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 440, in extract
    ie_result = self._real_extract(url)
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1899, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1201, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1191, in _decrypt_signature
    video_id, player_url, s
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1102, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/youtube.py", line 1163, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/pi/.local/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 796, 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 \x1b[0;34mInitial JS player signature function name\x1b[0m; 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.

Description of your issue, suggested solution and other information

Trying to run youtube-dl on my Raspberry Pi 3. About 75% of the songs fail.

The one in the error message up there fails, along with these others (same error message): https://www.youtube.com/watch?v=R__WfTD8rJs https://www.youtube.com/watch?v=vSkb0kDacjs https://www.youtube.com/watch?v=i1y5nqWSrZE https://www.youtube.com/watch?v=S73ypK3As8I

These work: https://www.youtube.com/watch?v=Q2W2TeUUYps https://www.youtube.com/watch?v=wYsMjEeEg4g

This was happening in both 2018.09.18 and now in 2018.09.26. I tried updating absolutely everything on my Pi to get it to work a week ago, figured I'd wait for an update to youtube-dl, as YouTube might've updated and I know that breaks youtube-dl. Unfortunately, the youtube-dl update did not fix the issue.

ytdl-org / youtube-dl