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JSON parsing error

See original GitHub issue

I get these errors when trying to download certain videos. I don’t know if it’s the fault of your code or of malformed JSON on youtube’s side.

Traceback (most recent call last):
  File "experiment_scripts/test_each_video.py", line 52, in test_video_id
    yt = pytube.YouTube(video_url)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/__main__.py", line 88, in __init__
    self.prefetch_init()
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/__main__.py", line 96, in prefetch_init
    self.prefetch()
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/__main__.py", line 174, in prefetch
    self.js_url = extract.js_url(self.watch_html, self.age_restricted)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/extract.py", line 147, in js_url
    ytplayer_config = get_ytplayer_config(html, age_restricted)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/extract.py", line 196, in get_ytplayer_config
    return json.loads(yt_player_config)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/json/__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 17575 (char 17574)

for video https://www.youtube.com/watch?v=qRNqJ5I6PYI&has_verified=1

  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/__main__.py", line 133, in init
    mixins.apply_signature(self.player_config_args, fmt, self.js)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/mixins.py", line 53, in apply_signature
    raise TypeError('JS is None')
TypeError: JS is None

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "experiment_scripts/test_each_video.py", line 52, in test_video_id
    yt = pytube.YouTube(video_url)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/__main__.py", line 88, in __init__
    self.prefetch_init()
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/__main__.py", line 97, in prefetch_init
    self.init()
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/__main__.py", line 136, in init
    self.embed_html, self.age_restricted,
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/extract.py", line 147, in js_url
    ytplayer_config = get_ytplayer_config(html, age_restricted)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/extract.py", line 195, in get_ytplayer_config
    yt_player_config = regex_search(pattern, html, group=1)
  File "/home/xkcd/miniconda3/envs/video-env/lib/python3.7/site-packages/pytube/helpers.py", line 65, in regex_search
    .format(pattern=pattern),
pytube.exceptions.RegexMatchError: regex pattern (;yt\.setConfig\(\{'PLAYER_CONFIG':\s*({.*})(,'EXPERIMENT_FLAGS'|;)) had zero matches

for video https://www.youtube.com/watch?v=jZLwVPakzwM&has_verified=1