Youtube-DL doesn't work with youtube on any video anymore.

Please follow the guide below

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 2018.10.05. 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 Issues with outdated version will be rejected.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 2018.10.05

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

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

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: ['https://youtu.be/F_QrKYAv1NE', '--verbose']
[debug] Encodings: locale cp1252, fs utf-8, out utf-8, pref cp1252
[debug] youtube-dl version 2018.08.04
[debug] Python version 3.6.4 (CPython) - Windows-10-10.0.17134-SP0
[debug] exe versions: ffmpeg N-92132-g0a41a8bf29, ffprobe N-92132-g0a41a8bf29
[debug] Proxy map: {}
[youtube] F_QrKYAv1NE: Downloading webpage
[youtube] F_QrKYAv1NE: Downloading video info webpage
[youtube] {18} signature length 42.40, html5 player vflATXXzL
[youtube] F_QrKYAv1NE: Downloading player https://www.youtube.com/yts/jsbin/player-vflATXXzL/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\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 "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\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 "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\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 "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\common.py", line 502, in extract
    ie_result = self._real_extract(url)
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1803, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\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 "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1210, in _decrypt_signature
    video_id, player_url, s
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1121, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\youtube_dl\extractor\youtube.py", line 1182, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "C:\Users\unknown\AppData\Local\Programs\Python\Python36\lib\site-packages\youtube_dl-2018.8.4-py3.6.egg\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.
...
<end of log>

If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

Single video: https://www.youtube.com/watch?v=BaW_jenozKc
Single video: https://youtu.be/BaW_jenozKc
Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

Note that youtube-dl does not support sites dedicated to copyright infringement. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

Description of your issue, suggested solution and other information

Explanation of your issue in arbitrary form goes here. Please make sure the description is worded well enough to be understood. Provide as much context and examples as possible. If work on your issue requires account credentials please provide them or explain how one can obtain them.

No, YouTube Videos I have found, works on youtube-dl anymore.

ytdl-org / youtube-dl