ERROR: Automatic signature extraction failed

[nimbius]

youtube-dl -x --audio-format mp3 --verbose http://www.youtube.com/watch?v=x3tvV9l-mx8
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-x', '--audio-format', 'mp3', '--verbose', 'http://www.youtube.com/watch?v=x3tvV9l-mx8']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.07.15-gentoo_no_offensive_sites
[debug] Python version 2.7.7 - Linux-3.12.5-ck-x86_64-Intel-R-_Core-TM-i7-3770_CPU@_3.40GHz-with-gentoo-2.2
[debug] Proxy map: {'http': 'http://redacted:3128', u'https': 'http://redacted:3128'}
[youtube] Setting language
[youtube] x3tvV9l-mx8: Downloading webpage
[youtube] x3tvV9l-mx8: Downloading video info webpage
[youtube] x3tvV9l-mx8: Extracting video information
[youtube] x3tvV9l-mx8: Encrypted signatures detected.
[youtube] encrypted signature length 84 (43.40), itag 22, html5 player en_US-vflArxUZc/html5player
ERROR: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 877, in _decrypt_signature
video_id, player_url, len(s)
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 352, 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/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 877, in _decrypt_signature
video_id, player_url, len(s)
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 352, in _extract_signature_function
player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'
Traceback (most recent call last):
File "/usr/lib64/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 516, in extract_info
ie_result = ie.extract(url)
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/common.py", line 168, in extract
return self._real_extract(url)
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 1249, in _real_extract
encrypted_sig, video_id, player_url, age_gate)
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 887, in _decrypt_signature
u'Automatic signature extraction failed: ' + tb, cause=e)
ExtractorError: Automatic signature extraction failed: Traceback (most recent call last):
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 877, in _decrypt_signature
video_id, player_url, len(s)
File "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 352, 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.

[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).

You seem to be using a package manager such as emerge or pip. Use that to update to a current version of youtube-dl (you may need to contact the package maintainer).

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

[nimbius]

problem solved. thanks for your quick response.