youtube: Unable to extract Initial JS player signature function name

[pasky]

Downloading certain videos from youtube fails, even with the latest git master.

$ python -m youtube_dl http://youtu.be/W4bMbzIExmk
[youtube] Setting language
[youtube] W4bMbzIExmk: Downloading webpage
[youtube] W4bMbzIExmk: Downloading video info webpage
[youtube] W4bMbzIExmk: Extracting video information
[youtube] W4bMbzIExmk: Encrypted signatures detected.
[youtube] W4bMbzIExmk: Downloading js player vflazPBMd
WARNING: Automatic signature extraction failed: Traceback (most recent call last):
File "youtube_dl/extractor/youtube.py", line 874, in _decrypt_signature
video_id, player_url, len(s)
File "youtube_dl/extractor/youtube.py", line 376, in _extract_signature_function
res = self._parse_sig_js(code)
File "youtube_dl/extractor/youtube.py", line 444, in _parse_sig_js
u'Initial JS player signature function name')
File "youtube_dl/extractor/common.py", line 383, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)
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.

WARNING: Warning: Falling back to static signature algorithm
...and the traceback just repeats again and again.

[chartpath]

@jaimeMF thanks for closing the duplicate issue.

More info: I was using youtube-dl version 2014.06.16 from pip originally, but saw that there have been some regex-related commits since that release. I reinstalled from git at commit 38a9339.

..same issue occurs.

[jaimeMF]

Thanks for the report, it will work in the next release.

[pasky]

Thank you! :)

[ziko8jp]

Thank you. I have been looking forward to the next release.

[barrydn]

Thanks dude!

[phihag]

Thank you for the report. Support for the changed files has been added in youtube-dl 2014.06.19. Type youtube-dl -U to update.

[vfatelinux]

My system is ubuntu ,update command is
sudo pip install --upgrade youtube_dl