ExtractorError: Could not find JS function u'pr' (yes, I have the latest version...)

[pelagisk]

When trying to download some videos, I get the error (this is not the case for e.g. https://www.youtube.com/watch?v=bLHL75H_VEM). I saw that there were previous, similar issues but this still remains. My youtube-dl is installed through homebrew.

planomenon:~ axelgagge$ youtube-dl -x --verbose https://www.youtube.com/watch?v=TwJn8Gx-1Qc
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-x', u'--verbose', u'https://www.youtube.com/watch?v=TwJn8Gx-1Qc']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.12.13
[debug] Python version 2.7.10 - Darwin-14.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.8, ffprobe 2.8
[debug] Proxy map: {}
[youtube] TwJn8Gx-1Qc: Downloading webpage
[youtube] TwJn8Gx-1Qc: Downloading video info webpage
[youtube] TwJn8Gx-1Qc: Extracting video information
[youtube] {43} signature length 41.43, html5 player en_US-vflGR-A-c
[youtube] TwJn8Gx-1Qc: Downloading player https://s.ytimg.com/yts/jsbin/player-en_US-vflGR-A-c/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 877, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 792, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 855, in _parse_sig_js
    initial_function = jsi.extract_function(funcname)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 241, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
ExtractorError: Could not find JS function u'pr'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by ExtractorError(u"Could not find JS function u'pr'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  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; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 877, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 792, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 855, in _parse_sig_js
    initial_function = jsi.extract_function(funcname)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 241, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
ExtractorError: Could not find JS function u'pr'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 663, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 290, in extract
    return self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1431, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 887, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 877, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 792, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 855, in _parse_sig_js
    initial_function = jsi.extract_function(funcname)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 241, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
ExtractorError: Could not find JS function u'pr'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by ExtractorError(u"Could not find JS function u'pr'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  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; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

[dstftw]

You are using an outdated version of youtube-dl. Read our FAQ if you have troubles updating.

[phihag]

To clarify: You can see the latest version at https://yt-dl.org/latest/version. As of writing, it's 2016.01.15. YouTube changed their player around December 20th 2015. As you can see in the sixth line of your output, your current version is 2015.12.13, so you need to update.