signature extraction failed

[shime]

I'm getting this error when trying to download this particular video https://www.youtube.com/watch?v=xsgnpOnV58k.

Here's more details:

$ youtube-dl --verbose https://www.youtube.com/watch?v=xsgnpOnV58k
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', 'https://www.youtube.com/watch?v=xsgnpOnV58k']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.11.09
[debug] Python version 3.4.2 - Linux-3.17.1-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg 2.4.2, ffprobe 2.4.2, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] Confirming age
[youtube] xsgnpOnV58k: Downloading webpage
[youtube] xsgnpOnV58k: Downloading video info webpage
[youtube] xsgnpOnV58k: Extracting video information
[youtube] xsgnpOnV58k: Encrypted signatures detected.
[youtube] {22} signature length 45.43, html5 player en_US-vfln6g5Eq
[youtube] xsgnpOnV58k: Downloading js player vfln6g5Eq
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 539, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 453, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 514, in _parse_sig_js
    'Initial JS player signature function name')
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/common.py", line 436, 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 . 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.
 (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 . 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.',)); 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/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 539, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 453, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 514, in _parse_sig_js
    'Initial JS player signature function name')
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/common.py", line 436, 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 . 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/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 539, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 453, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 514, in _parse_sig_js
    'Initial JS player signature function name')
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/common.py", line 436, 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 . 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.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/youtube_dl/YoutubeDL.py", line 536, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/common.py", line 199, in extract
    return self._real_extract(url)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 934, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 549, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 539, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 453, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 514, in _parse_sig_js
    'Initial JS player signature function name')
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/common.py", line 436, 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 . 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.
 (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 . 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.',)); 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.

[shime]

Fixed with #4178.