"Failed to parse JSON" on Reddit Video link

[hay]

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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 ```):

youtube-dl --verbose "https://www.reddit.com/r/AnimalsBeingDerps/comments/74k652/so_cute_she_cant_stand_it/?st=J8J7L0M3&sh=6b05cdab"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://www.reddit.com/r/AnimalsBeingDerps/comments/74k652/so_cute_she_cant_stand_it/?st=J8J7L0M3&sh=6b05cdab']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.10.15
[debug] Python version 2.7.13 - Darwin-16.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.3, ffprobe 3.3
[debug] Proxy map: {}
[RedditR] 74k652: Downloading JSON metadata
ERROR: 74k652: Failed to parse JSON  (caused by ValueError('No JSON object could be decoded',)); 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 691, in _parse_json
    return json.loads(json_string)
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded
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 434, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/reddit.py", line 89, in _real_extract
    url + '.json', video_id)[0]['data']['children'][0]['data']
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 685, in _download_json
    json_string, video_id, transform_source=transform_source, fatal=fatal)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 695, in _parse_json
    raise ExtractorError(errmsg, cause=ve)
ExtractorError: 74k652: Failed to parse JSON  (caused by ValueError('No JSON object could be decoded',)); 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.

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Description of your issue, suggested solution and other information

I've tried downloading this video but i'm getting a "Failed to parse JSON" error. Here's another link that has the same issue. youtube-dl is working fine if i use the fallback_url from the .json link (e.g. https://v.redd.it/f0ytj9lj17rz/DASH_4_8_M).

[hay]

@dstftw awesome, thanks!