I’ve experienced some posterisation artifacts in dark scenes on HDR movies with infuse 6 pro.
I compared scenes using infuse, plex on my Apple 4k tv and also my htpc and those artifacts are way more visible when using infuse. For information I have a Sony xf9005.
I’ve attached some pictures to compare.
The first is when played with infuse, the second plex on Apple tv and the third with my htpc.
Possibly, yes. With the Apple TV set to 4:2:2, the video output will be 12bit. 4:2:0 is 10bit.
All commercial HDR10 videos are encoded at 4:2:0, so there is really nothing to be gained by using 4:2:2. You may try switching to 4:2:0 to see if things improve for you. Some TVs do have issues with 12bit input.