Repository: yt-dlp
Issue: Add support for RTL+ / RTLPlus / https://plus.rtl.de
Labels: site-request,DRM,triage

### DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

- [X] I understand that I will be **blocked** if I *intentionally* remove or skip any mandatory\* field

### Checklist

- [X] I'm requesting a feature unrelated to a specific site
- [X] I've looked through the [README](https://github.com/yt-dlp/yt-dlp#readme)
- [X] I've verified that I'm running yt-dlp version **2023.10.13** ([update instructions](https://github.com/yt-dlp/yt-dlp#update)) or later (specify commit)
- [X] I've searched [known issues](https://github.com/yt-dlp/yt-dlp/issues/3766) and the [bugtracker](https://github.com/yt-dlp/yt-dlp/issues?q=) for similar issues **including closed ones**. DO NOT post duplicates
- [X] I've read the [guidelines for opening an issue](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#opening-an-issue)

### Provide a description that is worded well enough to be understood

Free Video URL

https://plus.rtl.de/video-tv/serien/legend-of-wacken-942327


$ ./yt-dlp_linux -vU
[debug] Command-line config: ['-vU']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version stable@2023.10.13 [b634ba742] (linux_exe)
[debug] Python 3.10.12 (CPython x86_64 64bit) - Linux-6.1.0-13-amd64-x86_64-with-glibc2.36 (OpenSSL 3.1.3 19 Sep 2023, glibc 2.36)
[debug] exe versions: ffmpeg 5.1.3-1 (setts), ffprobe 5.1.3-1, rtmpdump 2.4
[debug] Optional libraries: Cryptodome-3.19.0, brotli-1.1.0, certifi-2023.07.22, mutagen-1.47.0, sqlite3-3.43.2, websockets-11.0.3
[debug] Proxy map: {}
[debug] Loaded 1890 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Available version: stable@2023.10.13, Current version: stable@2023.10.13
Current Build Hash: 6d30ea8e0f299a91c22161e877


$ ./yt-dlp_linux -v https://plus.rtl.de/video-tv/serien/legend-of-wacken-942327/staffel-1-942328/episode-1-painkiller-942329
[debug] Command-line config: ['-v', 'https://plus.rtl.de/video-tv/serien/legend-of-wacken-942327/staffel-1-942328/episode-1-painkiller-942329']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version stable@2023.10.13 [b634ba742] (linux_exe)
[debug] Python 3.10.12 (CPython x86_64 64bit) - Linux-6.1.0-13-amd64-x86_64-with-glibc2.36 (OpenSSL 3.1.3 19 Sep 2023, glibc 2.36)
[debug] exe versions: ffmpeg 5.1.3-1 (setts), ffprobe 5.1.3-1, rtmpdump 2.4
[debug] Optional libraries: Cryptodome-3.19.0, brotli-1.1.0, certifi-2023.07.22, mutagen-1.47.0, sqlite3-3.43.2, websockets-11.0.3
[debug] Proxy map: {}
[debug] Loaded 1890 extractors
[generic] Extracting URL: https://plus.rtl.de/video-tv/serien/legend-of-wacken-942327/staffel-1-942328/episode-1-painkiller-942329
[generic] episode-1-painkiller-942329: Downloading webpage
WARNING: [generic] Falling back on generic information extractor
[generic] episode-1-painkiller-942329: Extracting information
[debug] Looking for embeds
ERROR: Unsupported URL: https://plus.rtl.de/video-tv/serien/legend-of-wacken-942327/staffel-1-942328/episode-1-painkiller-942329
Traceback (most recent call last):
  File "yt_dlp/YoutubeDL.py", line 1567, in wrapper
  File "yt_dlp/YoutubeDL.py", line 1702, in __extract_info
  File "yt_dlp/extractor/common.py", line 715, in extract
  File "yt_dlp/extractor/generic.py", line 2575, in _real_extract
yt_dlp.utils.UnsupportedError: Unsupported URL: https://plus.rtl.de/video-tv/serien/legend-of-wacken-942327/staffel-1-942328/episode-1-painkiller-942329



### Provide verbose output that clearly demonstrates the problem

- [X] Run **your** yt-dlp command with **-vU** flag added (`yt-dlp -vU <your command line>`)
- [ ] If using API, add `'verbose': True` to `YoutubeDL` params instead
- [X] Copy the WHOLE output (starting with `[debug] Command-line config`) and insert it below

### Complete Verbose Output

_No response_