Forgive me if this is the wrong subforum, but I did not see one specifically for Apple TV.
On my current generation Apple TV, and ONLY on my Apple TV, playback is very choppy/jerky, with any file. When I play through the LG TV Emby app it doesn't happen, but I really dislike the LG app's UI and the TV remote. I actually quit using Plex a while back because they would not address problems like this on the Apple TV. And now this same issue has cropped up in Emby, so I sure hope there is some hope for a fix or I'm just out of luck.
A log file is attached to this post.