Repository: youtube-dl
Issue: rtve.es:alacarta (alias rtve.es:play) doesn't work
Labels: broken-IE

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## Checklist

<!--
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 2021.12.17. 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 Issues with outdated version will be REJECTED.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 **2021.12.17**
- [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 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 2021.12.17
 [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>
-->

```
$ youtube-dl -v https://www.rtve.es/alacarta/videos/somos-documentales/avion-novias/6704549/
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.rtve.es/alacarta/videos/somos-documentales/avion-novias/6704549/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.6.9 (CPython) - Linux-5.4.0-126-generic-x86_64-with-LinuxMint-19.3-tricia
[debug] exe versions: ffmpeg 4.1.3-0ppa1, ffprobe 4.1.3-0ppa1
[debug] Proxy map: {}
[rtve.es:alacarta] Fetching manager info
[rtve.es:alacarta] 6704549: Downloading JSON metadata
[rtve.es:alacarta] 6704549: Downloading url information
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/__init__.py", line 475, in main
    _real_main(argv)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/__init__.py", line 465, in _real_main
    retcode = ydl.download(all_urls)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/YoutubeDL.py", line 2069, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/YoutubeDL.py", line 808, in extract_info
    return self.__extract_info(url, ie, download, extra_info, process)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/extractor/rtve.py", line 153, in _real_extract
    formats = self._extract_png_formats(video_id)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/extractor/rtve.py", line 127, in _extract_png_formats
    for quality, video_url in self._decrypt_url(png):
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/extractor/rtve.py", line 90, in _decrypt_url
    quality, url_data = text.split(b'%%')
ValueError: not enough values to unpack (expected 2, got 1)
```


## Description

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The real url is https://www.rtve.es/play/videos/somos-documentales/avion-novias/6704549/ but as it's said in others issues it needed change `play` by `alacarta`.