Repository: youtube-dl
Issue: Error for videos from https://www.rtp.pt/play/
Labels: duplicate

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## Checklist

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Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2020.09.06. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
- Make sure that all provided video/audio/playlist URLs (if any) are alive and playable in a browser.
- Make sure that all URLs and arguments with special characters are properly quoted or escaped as explained in http://yt-dl.org/escape.
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- [ ] I'm reporting a broken site support issue
- [x ] I've verified that I'm running youtube-dl version **2020.09.06**
- [x ] I've checked that all provided URLs are alive and playable in a browser
- [x] I've checked that all URLs and arguments with special characters are properly quoted or escaped
- [x] I've searched the bugtracker for similar bug reports including closed ones
- [x] I've read bugs section in FAQ


## Verbose log

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Provide the complete verbose output of youtube-dl that clearly demonstrates the problem.
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 below. It should look similar to this:
 [debug] System config: []
 [debug] User config: []
 [debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
 [debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
 [debug] youtube-dl version 2020.09.06
 [debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
 [debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
 [debug] Proxy map: {}
 <more lines>
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```
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.rtp.pt/play/p5057/3-mulheres', '--verbose']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.09.06
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: none
[debug] Proxy map: {}
[RTP] 3-mulheres: Downloading webpage
ERROR: 3-mulheres: Failed to parse JSON  (caused by ValueError("Expecting ',' delimiter: line 11 column 11 (char 715)",)); 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 "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpquf06fea\build\youtube_dl\extractor\common.py", line 899, in _parse_json
  File "C:\Python\Python34\lib\json\__init__.py", line 318, in loads
  File "C:\Python\Python34\lib\json\decoder.py", line 343, in decode
  File "C:\Python\Python34\lib\json\decoder.py", line 359, in raw_decode
ValueError: Expecting ',' delimiter: line 11 column 11 (char 715)
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpquf06fea\build\youtube_dl\extractor\common.py", line 899, in _parse_json
  File "C:\Python\Python34\lib\json\__init__.py", line 318, in loads
  File "C:\Python\Python34\lib\json\decoder.py", line 343, in decode
  File "C:\Python\Python34\lib\json\decoder.py", line 359, in raw_decode
ValueError: Expecting ',' delimiter: line 11 column 11 (char 715)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpquf06fea\build\youtube_dl\YoutubeDL.py", line 797, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpquf06fea\build\youtube_dl\extractor\common.py", line 530, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpquf06fea\build\youtube_dl\extractor\rtp.py", line 37, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpquf06fea\build\youtube_dl\extractor\common.py", line 903, in _parse_json
youtube_dl.utils.ExtractorError: 3-mulheres: Failed to parse JSON  (caused by ValueError("Expecting ',' delimiter: line 11 column 11 (char 715)",)); 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.
```


## Description

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Tried downloading file for the first time from https://www.rtp.pt/play/ as it is shown as a supported site, received error message above.