2025-01-12, 01:55 PM
> Jellyfin on iOS transcodes .ac3 to .aac causing 50%-70% CPU usage.
Jellyfin on iOS does support ac3 natively though, it is just iOS only supports up to 6 channel audio so the 8 channel audio is getting downmixed. Can you verify that? And please don't check the use native player option in app settings, that player is worse than the web player.
> 50%-70% CPU usage sounds really high to transcode a single audio stream but I’m new to all of this so I have no idea if I am incorrect or not.
If you have a weak CPU (which probably is if you are running 8100T at its TDP which is only as fast as an N100), multi-channel audio processing could be quite intensive depending on the contents especially when it is both transcoding and down-mixing. But 70% overall is still a bit too high. Does the CPU run at max clock it could when having this usage and does most of the usages comes from ffmpeg?
Jellyfin on iOS does support ac3 natively though, it is just iOS only supports up to 6 channel audio so the 8 channel audio is getting downmixed. Can you verify that? And please don't check the use native player option in app settings, that player is worse than the web player.
> 50%-70% CPU usage sounds really high to transcode a single audio stream but I’m new to all of this so I have no idea if I am incorrect or not.
If you have a weak CPU (which probably is if you are running 8100T at its TDP which is only as fast as an N100), multi-channel audio processing could be quite intensive depending on the contents especially when it is both transcoding and down-mixing. But 70% overall is still a bit too high. Does the CPU run at max clock it could when having this usage and does most of the usages comes from ffmpeg?