Repository: youtube-dl
Issue: support posts with multiple videos on sxyprn.com
Labels: site-update-request

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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 2020.12.26. 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 Issues with outdated version will be REJECTED.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.
- Search the bugtracker for similar issues: http://yt-dl.org/search-issues. DO NOT post duplicates.
- Finally, put x into all relevant boxes (like this [x])
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- [x] I'm reporting a broken site support
- [x] I've verified that I'm running youtube-dl version **2020.12.12**
- [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
- [ ] I've searched the bugtracker for similar issues including closed ones


## Verbose log

<!--
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 2020.12.26
 [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>
-->

```
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-vo', '/dev/null', 'https://sxyprn.com/post/5af15f6799de9.html']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.12.12
[debug] Lazy loading extractors enabled
[debug] Git HEAD: 222c704
[debug] Python version 3.8.5 (CPython) - Linux-5.9.14-x86_64-with-glibc2.2.5
[debug] exe versions: ffmpeg 4.3.1, ffprobe 4.3.1, rtmpdump 2.4
[debug] Proxy map: {}
[YourPorn] 5af15f6799de9: Downloading webpage
ERROR: An extractor error has occurred. (caused by KeyError('5af15f6799de9')); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/nix/store/5kz4xxh3l3pvjza4vaynp4k0rnpsjh6d-python3.8-youtube-dl-2020.12.12/lib/python3.8/site-packages/youtube_dl/extractor/common.py", line 532, in extract
    ie_result = self._real_extract(url)
  File "/nix/store/5kz4xxh3l3pvjza4vaynp4k0rnpsjh6d-python3.8-youtube-dl-2020.12.12/lib/python3.8/site-packages/youtube_dl/extractor/yourporn.py", line 37, in _real_extract
    parts = self._parse_json(
KeyError: '5af15f6799de9'
Traceback (most recent call last):
  File "/nix/store/5kz4xxh3l3pvjza4vaynp4k0rnpsjh6d-python3.8-youtube-dl-2020.12.12/lib/python3.8/site-packages/youtube_dl/extractor/common.py", line 532, in extract
    ie_result = self._real_extract(url)
  File "/nix/store/5kz4xxh3l3pvjza4vaynp4k0rnpsjh6d-python3.8-youtube-dl-2020.12.12/lib/python3.8/site-packages/youtube_dl/extractor/yourporn.py", line 37, in _real_extract
    parts = self._parse_json(
KeyError: '5af15f6799de9'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/nix/store/5kz4xxh3l3pvjza4vaynp4k0rnpsjh6d-python3.8-youtube-dl-2020.12.12/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 803, in wrapper
    return func(self, *args, **kwargs)
  File "/nix/store/5kz4xxh3l3pvjza4vaynp4k0rnpsjh6d-python3.8-youtube-dl-2020.12.12/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 824, in __extract_info
    ie_result = ie.extract(url)
  File "/nix/store/5kz4xxh3l3pvjza4vaynp4k0rnpsjh6d-python3.8-youtube-dl-2020.12.12/lib/python3.8/site-packages/youtube_dl/extractor/common.py", line 545, in extract
    raise ExtractorError('An extractor error has occurred.', cause=e)
youtube_dl.utils.ExtractorError: An extractor error has occurred. (caused by KeyError('5af15f6799de9')); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
```


## Description

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Posts containing multiple videos are not supported.