ERROR: Automatic signature extraction failed

[dannote]

Failed to download a playlist from YouTube. Here's the log.

[download] Downloading video #21 of 393
[youtube] OIA1btTCZXY: Downloading webpage
[youtube] OIA1btTCZXY: Downloading video info webpage
[youtube] OIA1btTCZXY: Extracting video information
[youtube] OIA1btTCZXY: Encrypted signatures detected.
[youtube] encrypted signature length 84 (28.55), itag 22, html5 player en_US-vflCGk6yw\/html5player
ERROR: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 469, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 351, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'
; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type  youtube-dl -U  to update.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 469, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 351, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 516, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 169, in extract
    return self._real_extract(url)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 845, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature
    u'Automatic signature extraction failed: ' + tb, cause=e)
ExtractorError: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 469, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 351, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'

[phihag]

You are using an outdated version of youtube-dl. YouTube changed their player on 2014-07-25, so you'll need at least youtube-dl version 2014.07.25 (or newer).

It looks like you installed youtube-dl with a package manager (something like apt-get, pacman, or pip). You can use that package manager to update youtube-dl (you may need to contact the package maintainer though, and request an update).

Alternatively, uninstall the youtube package and follow our manual installation instructions. From then on, you'll be able to update with sudo youtube-dl -U.