Fails to download certain youtube videos with "Signature extraction failed" error

[alexbhandari]

Fails only on certain videos. Using version: 2014.09.04
Failed with www.youtube.com/watch?v=V_XxpMD0wa4 and https://www.youtube.com/watch?v=O0vf2EfesOA

If someone can try downloading those two videos and post whether this is a general bug or something only I am experiencing that would be awesome! Thanks!

youtube-dl www.youtube.com/watch?v=V_XxpMD0wa4 --verbose
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['www.youtube.com/watch?v=V_XxpMD0wa4', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.09.04
[debug] Python version 2.7.7 - Darwin-14.0.0-x86_64-i386-64bit
[debug] Proxy map: {}
[youtube] Setting language
[youtube] Confirming age
[youtube] V_XxpMD0wa4: Downloading webpage
[youtube] V_XxpMD0wa4: Downloading video info webpage
[youtube] V_XxpMD0wa4: Extracting video information
[youtube] V_XxpMD0wa4: Encrypted signatures detected.
[youtube] {22} signature length 40.41, html5 player en_US-vflqxvClr
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 530, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 435, in _extract_signature_function
    cache_spec = self._downloader.cache.load(u'youtube-sigfuncs', func_id)
  File "/usr/local/bin/youtube-dl/youtube_dl/cache.py", line 62, in load
    cache_fn = self._get_cache_fn(section, key, dtype)
  File "/usr/local/bin/youtube-dl/youtube_dl/cache.py", line 29, in _get_cache_fn
    assert re.match(r'^[a-zA-Z0-9_-]+$', key)
AssertionError
; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type  youtube-dl -U  to update.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 530, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 435, in _extract_signature_function
    cache_spec = self._downloader.cache.load(u'youtube-sigfuncs', func_id)
  File "/usr/local/bin/youtube-dl/youtube_dl/cache.py", line 62, in load
    cache_fn = self._get_cache_fn(section, key, dtype)
  File "/usr/local/bin/youtube-dl/youtube_dl/cache.py", line 29, in _get_cache_fn
    assert re.match(r'^[a-zA-Z0-9_-]+$', key)
AssertionError
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 523, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 178, in extract
    return self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 915, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 540, in _decrypt_signature
    u'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 530, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 435, in _extract_signature_function
    cache_spec = self._downloader.cache.load(u'youtube-sigfuncs', func_id)
  File "/usr/local/bin/youtube-dl/youtube_dl/cache.py", line 62, in load
    cache_fn = self._get_cache_fn(section, key, dtype)
  File "/usr/local/bin/youtube-dl/youtube_dl/cache.py", line 29, in _get_cache_fn
    assert re.match(r'^[a-zA-Z0-9_-]+$', key)
AssertionError
; 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]

Thank you for the report. I apologize for the mistake, I did not take into account all kinds of characters in cache keys. This should be fixed in youtube-dl 2014.09.04.1. Type youtube-dl -U to update.