Audio normalization across files?

[VainCoffee]

I've noticed that some media files have either really low or really high volume. Is there some sort of feature or plugin that will set the gain of an audio file based on the average library volume? Or something like that.

[niels]

Starting with Jellyfin 10.9 (next release) the server will detect LUFS values for audio files. Clients will need updating to support it though.