Error only occurred for this video. Error was: Unable to extract Initial JS player signature function name

[brianwoo]

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• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.09.01. 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 Issues with outdated version will be rejected.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 2018.09.01

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)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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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 ```):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://www.youtube.com/watch?v=e0zK-QBubbk']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.09.01
[debug] Python version 3.6.4 (CPython) - Linux-4.4.0-130-generic-x86_64-with-debian-stretch-sid
[debug] exe versions: avconv 2.8.15-0ubuntu0.16.04.1, avprobe 2.8.15-0ubuntu0.16.04.1, ffmpeg 2.8.15-0ubuntu0.16.04.1, ffprobe 2.8.15-0ubuntu0.16.04.1
[debug] Proxy map: {}
[youtube] e0zK-QBubbk: Downloading webpage
[youtube] e0zK-QBubbk: Downloading video info webpage
[youtube] {22} signature length 41.42, html5 player vflvABTsY
[youtube] e0zK-QBubbk: Downloading player https://www.youtube.com/yts/jsbin/player-vflvABTsY/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/aaa/anaconda3/lib/python3.6/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 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 "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/aaa/anaconda3/lib/python3.6/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 "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/aaa/anaconda3/lib/python3.6/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 "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 502, in extract
    ie_result = self._real_extract(url)
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1803, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/home/aaa/anaconda3/lib/python3.6/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 "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/home/aaa/anaconda3/lib/python3.6/site-packages/youtube_dl/extractor/youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/home/aaa/anaconda3/lib/python3.6/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 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.

Description of your issue, suggested solution and other information

Unable to download this particular video.

[brianwoo]

Please ignore this bug. Someone else reported it 20 mins ago while I was typing this out.