I like the AppleTV - what a great little bit of kit. The sad thing is, the application that connects to my Jellyfin server has been very hit and miss. I've tried a few different things and it has not been a great outcome at times.
Swiftfin was OK but had issues with some file types and then stopped working entirely. I'm not sure what happened with it, so I got frustrated and ditched it.
JellyTV was initially promising and the carousel look was pretty neat, but the connection to my server was consistently crap and fell over a lot. It would stop playing videos, lag, and have all kinds of problems. No network issues or anything like that so again, I got frustrated and got rid of it.
Infuse looked amazing, but as soon as I tried to play anything it wanted to upgrade to Pro and that was that. Off with it. Open Source for the win!
Ah look! A new version of Swiftfin has arrived. I installed it - it looks different, and the functionality has improved. OK that's exciting - initial testing is going very well.
At the back end of all of this I added an Nvidia graphics adaptor to my server to try and improve Jellyfin's capabilities and it has certainly helped, especially with the higher end formats of videos (8K for example). I thought this would help the AppleTV deliver vision to my eye balls better, but it did not. It appears the app you use is a big chunk of the problem and so getting the right one is key. My continued testing has shown Swiftfin to work pretty well. It's supposed to be a native app so my expectations are it will work fairly well.
I have read that the Jellyfin leads have finished up or walked off? I'm not sure, but I want to thank everyone who has worked on the project - it's pretty amazing and works really well. You all have done a great job and end users like me are very grateful.