Jellyfin not reading replaygain tags

[TheDreadPirate]

I haven't been able get a solid answer whether this is still true, but last I heard the replay gain tag is not read. You need to enable "LUFS scans" in the music library settings and then run the audio normalization job. That will generate a per-track and album normalization value that is stored in Jellyfin's DB.

The official client web, desktop, and phone clients uses this normalization value, though some users have issues with it causing popping in the official clients. Finamp and Symfonium also use this LUFS value for normalization.