You should probably file a bug in gstreamer if you have tagging issues.
Rhythmbox just gstreamer backend for tagging.
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https://bugs.launchpad.net/bugs/1836459
Title:
Yes, you are right, it is not a MP3 file.
My main problem wasn't that it doesn't work, but the lack of debugging
options.
It would be nice if rhythmbox could display the tags of webm containers
with opus audio (like id3info), or if it would somehow tell you that
test.mp3 is not a valid mp3 file.
Because it's not an MP3 file. It's Webm container with opus audio.
$ youtube-dl --extract-audio --audio-format mp3 "https://youtu.be/Sqk3B2041uk;
--output test.mp3
[youtube] Sqk3B2041uk: Downloading webpage
[download] Destination: test.mp3
[download] 100% of 2.07MiB in 00:01
[ffmpeg]
