have a bug.

[p0we7]

pi@raspberrypi ~/FH $ youtube-dl "https://www.youtube.com/watch?v=8U-7BBgGwPQ" --verbose
[debug] System config: [u'--proxy', u'192.168.0.11:23333', u'--extract-audio', u'--audio-format', u'mp3', u'--audio-quality', u'128K']
[debug] User config: []
[debug] Command-line args: [u'https://www.youtube.com/watch?v=8U-7BBgGwPQ', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.09.09
[debug] Python version 2.7.3 - Linux-3.18.11-v7+-armv7l-with-debian-7.8
[debug] exe versions: ffmpeg 1.0.10, ffprobe 1.0.10
[debug] Proxy map: {u'http': u'192.168.0.11:23333', u'https': u'192.168.0.11:23333'}
[youtube] 8U-7BBgGwPQ: Downloading webpage
[youtube] 8U-7BBgGwPQ: Downloading video info webpage
[youtube] 8U-7BBgGwPQ: Extracting video information
WARNING: unable to extract html5 player; 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.
[youtube] {22} signature length 40.44, html5 player None
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 771, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 663, in _extract_signature_function
    raise ExtractorError('Cannot identify player %r' % player_url)
ExtractorError: Cannot identify player u'https://s.ytimg.com/yts/jsbin/player-en_US-vfljDEtYP/base.js'; 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 ExtractorError(u"Cannot identify player u'https://s.ytimg.com/yts/jsbin/player-en_US-vfljDEtYP/base.js'; 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 "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 771, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 663, in _extract_signature_function
    raise ExtractorError('Cannot identify player %r' % player_url)
ExtractorError: Cannot identify player u'https://s.ytimg.com/yts/jsbin/player-en_US-vfljDEtYP/base.js'; 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 "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 660, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 287, in extract
    return self._real_extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 1299, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 781, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 771, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 663, in _extract_signature_function
    raise ExtractorError('Cannot identify player %r' % player_url)
ExtractorError: Cannot identify player u'https://s.ytimg.com/yts/jsbin/player-en_US-vfljDEtYP/base.js'; 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 ExtractorError(u"Cannot identify player u'https://s.ytimg.com/yts/jsbin/player-en_US-vfljDEtYP/base.js'; 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.

[dstftw]

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

[dstftw]

Next time you file a bug report post the full output of youtube-dl when run with --verbose option.

[p0we7]

i already modify report the full output