Bug

[edwinjue]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
• Use the Preview tab to see what your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.12.02. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2017.12.02

Before submitting an issue make sure you have:

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

What is the purpose of your issue?

• [ x] Bug report (encountered problems with youtube-dl)
• [ ] Site support request (request for adding support for a new site)
• [ ] Feature request (request for a new functionality)
• [ ] Question
• [ ] Other

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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-cik', u'-f', u'mp4', u'--restrict-filenames', u'-o', u'%(title)s-%(id)s.%(ext)s', u'--verbose', u'https://clips.twitch.tv/BenevolentPeppyTermiteUWot']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.12.02
[debug] Python version 2.7.12 - Linux-4.4.0-101-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg 3.0.2-4, ffprobe 3.0.2-4, rtmpdump 2.4
[debug] Proxy map: {}
[twitch:clips] BenevolentPeppyTermiteUWot: Downloading webpage
ERROR: BenevolentPeppyTermiteUWot: Failed to parse JSON  (caused by ValueError("Expecting ',' delimiter: line 38 column 320 (char 2206)",)); 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/common.py", line 686, in _parse_json
    return json.loads(json_string)
  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 380, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Expecting ',' delimiter: line 38 column 320 (char 2206)
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 784, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 437, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/twitch.py", line 610, in _real_extract
    video_id, transform_source=js_to_json)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 690, in _parse_json
    raise ExtractorError(errmsg, cause=ve)
ExtractorError: BenevolentPeppyTermiteUWot: Failed to parse JSON  (caused by ValueError("Expecting ',' delimiter: line 38 column 320 (char 2206)",)); 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....
<end of log>

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Description of your issue, suggested solution and other information

The following command bugs out: youtube-dl -cik -f mp4 --restrict-filenames -o "%(title)s-%(id)s.%(ext)s" --verbose https://clips.twitch.tv/BenevolentPeppyTermiteUWot

[dstftw]

Duplicate of #14789.