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] Post-process file test.mp3 exists, skipping
$ gst-typefind-1.0 test.mp3
test.mp3 - audio/webm
** Changed in: rhythmbox (Ubuntu)
Status: New => Incomplete
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Packages, which is subscribed to rhythmbox in Ubuntu.
https://bugs.launchpad.net/bugs/1836459
Title:
Rythmbox fails to read mp3 tags
Status in rhythmbox package in Ubuntu:
Incomplete
Bug description:
Please note, that I'm not 100 % sure if this is a bug in rythmbox, it
could be a bug in id3v2 or in youtube-dl, but I think it's in
Rythmbox.
How to reproduce:
Step 1: Run the following commands:
sudo apt install youtube-dl ffmpeg id3v2 -y
youtube-dl --extract-audio --audio-format mp3 "https://youtu.be/Sqk3B2041uk";
--output test.mp3
id3v2 -t "cooltitle" -a "coolartist" test.mp3
In theory this should create an mp3 file "test.mp3" with the title
"cooltitle" and the artist "coolartist". I confirmed this using id3info
test.mp3 :
*** Tag information for test.mp3
=== TIT2 (Title/songname/content description): cooltitle
=== TPE1 (Lead performer(s)/Soloist(s)): coolartist
*** mp3 info
MPEG1/layer I
Bitrate: 320KBps
Frequency: 44KHz
When I open test.mp3 using Rythmbox, Rythmbox is able to play this
song, but its says that the artist is unknown an the title is
test.mp3.
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