Signature extraction failed

[twisp007]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.09.10. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• [ x] I've verified and I assure that I'm running youtube-dl 2018.09.10

Before submitting an issue make sure you have:

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

What is the purpose of your issue?

• [ x] Bug report (encountered problems with youtube-dl)

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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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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 -f 251 https://www.youtube.com/playlist?list=PLjY-n1IeO9AhLX64WDER1SwflO2P5-MhR -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', '251', 'https://www.youtube.com/playlist?list=PLjY-n1IeO9AhLX64WDER1SwflO2P5-MhR', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.08.04
[debug] Python version 3.7.0 (CPython) - Linux-4.14.67-1-MANJARO-x86_64-with-arch-Manjaro-Linux
[debug] exe versions: ffmpeg n4.0.2, ffprobe n4.0.2, rtmpdump 2.4
[debug] Proxy map: {}
[youtube:playlist] PLjY-n1IeO9AhLX64WDER1SwflO2P5-MhR: Downloading webpage
[download] Downloading playlist: 4 Cover R Worse
[youtube:playlist] playlist 4 Cover R Worse: Downloading 78 videos
[download] Downloading video 1 of 78
[youtube] ZKmfQP5leYM: Downloading webpage
[youtube] ZKmfQP5leYM: Downloading video info webpage
[debug] Invoking downloader on 'https://r2---sn-5jucgv5qc5oq-itq6.googlevideo.com/videoplayback?c=WEB&ei=ai2WW77QGMLToAOr25vQCg&keepalive=yes&source=youtube&initcwndbps=862500&mn=sn-5jucgv5qc5oq-itq6%2Csn-h5576n7k&mm=31%2C29&pl=22&id=o-AHnCPYf1qhbjkP-GRtgFdTby82R43mZOgB3-QFLEZ4Eb&mv=m&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&mt=1536568572&ms=au%2Crdu&requiressl=yes&ip=183.83.44.227&lmt=1478041060990331&expire=1536590282&fvip=2&dur=217.921&ipbits=0&signature=906F7ED1C28E7CF57302083EDFD5BFB3CE1F876D.46562585D2482AD04561B03647EA558F8C1124FB&itag=251&clen=3040888&key=yt6&gir=yes&mime=audio%2Fwebm&ratebypass=yes'
[download] Just Like Heaven by The Cure - Marie Digby Cover-ZKmfQP5leYM.webm has already been downloaded
[download] 100% of 2.90MiB
[download] Downloading video 2 of 78
[youtube] 2Rmil_raUtU: Downloading webpage
[youtube] 2Rmil_raUtU: Downloading video info webpage
[youtube] {43} signature length 41.42, html5 player vflvABTsY
[youtube] 2Rmil_raUtU: Downloading player https://www.youtube.com/yts/jsbin/player-vflvABTsY/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 1210, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1182, 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 972, 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 "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1182, 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 972, 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 1210, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1182, 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 972, 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 502, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1803, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1220, 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 1210, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.7/site-packages/youtube_dl/extractor/youtube.py", line 1182, 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 972, 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.
...
<end of log>

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[twisp007]

I think I didn't update youtube-dl. Will update and see.