SixPlay broken

[desbma]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.02.07. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.02.07

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

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• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
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Download from 6play.fr seem to be broken (see below). It was working 2 days ago (it may be due to a change of the site).
The site appears to require an account to download videos, however I know that for example all the videos from this page could be downloaded previously with youtube-dl despite the login popup on the site.
See also #9979

$ youtube-dl -v 'http://www.6play.fr/enquete-exclusive-p_831/Etats-Unis-enquete-sur-les-multimillionnaires-du-loto-c_11652412'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'http://www.6play.fr/enquete-exclusive-p_831/Etats-Unis-enquete-sur-les-multimillionnaires-du-loto-c_11652412']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.02.07
[debug] Python version 3.6.0 - Linux-4.4.45-1-lts-x86_64-with-arch
[debug] exe versions: ffmpeg 3.2.2, ffprobe 3.2.2, rtmpdump 2.4
[debug] Proxy map: {}
[SixPlay] 11652412: Downloading JSON metadata
ERROR: Unable to download JSON metadata: HTTP Error 404: Not Found (caused by <HTTPError 404: 'Not Found'>); 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.
  File "/home/maxime/py-venvs/tmp-d1403ee34496044/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 416, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/home/maxime/py-venvs/tmp-d1403ee34496044/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2006, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib64/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/usr/lib64/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib64/python3.6/urllib/request.py", line 570, in error
    return self._call_chain(*args)
  File "/usr/lib64/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib64/python3.6/urllib/request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)

[seirl]

Getting this issue as well with other 6play videos. ping @remitamine who commited the initial scraper I think.