Unable to download videos from tvline.com.

[antdude]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.09.06
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

Fedora v31:
$ youtube-dl -v https://tvline.com/2020/09/07/supergirl-season-5-gag-reel-video/
[debug] System config: ['--prefer-free-formats']
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://tvline.com/2020/09/07/supergirl-season-5-gag-reel-video/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.09.06
[debug] Python version 3.7.8 (CPython) - Linux-5.5.11-200.fc31.x86_64-x86_64-with-fedora-31-Thirty_One
[debug] exe versions: ffmpeg 4.2.4, ffprobe 4.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[generic] supergirl-season-5-gag-reel-video: Requesting header
WARNING: Falling back on generic information extractor.
[generic] supergirl-season-5-gag-reel-video: Downloading webpage
[generic] supergirl-season-5-gag-reel-video: Extracting information
Traceback (most recent call last):
  File "/usr/lib64/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib64/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/ant/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/home/ant/bin/youtube-dl/youtube_dl/__init__.py", line 474, in main
  File "/home/ant/bin/youtube-dl/youtube_dl/__init__.py", line 464, in _real_main
  File "/home/ant/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2019, in download
  File "/home/ant/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 797, in extract_info
  File "/home/ant/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
  File "/home/ant/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3239, in _real_extract
  File "/home/ant/bin/youtube-dl/youtube_dl/extractor/common.py", line 2702, in _parse_jwplayer_data
TypeError: 'str' object does not support item assignment

Debian Jessie v8:
$ youtube-dl -v https://tvline.com/2020/09/07/supergirl-season-5-gag-reel-video/
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://tvline.com/2020/09/07/supergirl-season-5-gag-reel-video/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.09.06
[debug] Python version 3.4.2 (CPython) - Linux-3.16.0-11-amd64-x86_64-with-debian-8.11
[debug] exe versions: ffmpeg 3.2.10-1, ffprobe 3.2.10-1, rtmpdump 2.4
[debug] Proxy map: {}
[generic] supergirl-season-5-gag-reel-video: Requesting header
WARNING: Falling back on generic information extractor.
[generic] supergirl-season-5-gag-reel-video: Downloading webpage
[generic] supergirl-season-5-gag-reel-video: Extracting information
Traceback (most recent call last):
  File "/usr/lib/python3.4/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.4/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/ant/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/home/ant/bin/youtube-dl/youtube_dl/__init__.py", line 474, in main
  File "/home/ant/bin/youtube-dl/youtube_dl/__init__.py", line 464, in _real_main
  File "/home/ant/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2019, in download
  File "/home/ant/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 797, in extract_info
  File "/home/ant/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
  File "/home/ant/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3239, in _real_extract
  File "/home/ant/bin/youtube-dl/youtube_dl/extractor/common.py", line 2702, in _parse_jwplayer_data
TypeError: 'str' object does not support item assignment

Description

Youtube-dl can't download videos from tvline.com. Thank you for reading and hopefully fixing it soon. :)