My Apple TV 4 is transcoding 24fps 1080p h.264 video that is in a mp4 container, the video also has a high profile level of 4.1. I am unsure why it is transcoding this as the Apple TV supports *H.264 video up to 1080p, 60 frames per second, High or Main Profile level 4.2 or lower with an mp4 container * (taken straight from http://www.apple.com/au/tv/specs/).
I am using MakeMKV to convert my blu rays to MKV files. I then remux this file to mp4 with a program called mp4tools (pretty much a gui for ffmpeg) in order to have a lossless conversion from MKV to mp4. I do not intend to use any transcoding tools like handbrake as I want blu ray quality files and will only be needing this quality on a few of my favourite films so it won't take up too much of my storage.
I have also tried removing the subtitle track as I have read sometimes this forces a transcode even if the video format is supported, however, this still does not work.
I also do not believe network speeds are an issue as I am trying to play the file over my local network, which should be more than fast enough. My MacBook Pro can also direct play (no transcoding) the file using Plex Media Player wirelessly so network speeds should be sufficient.
My only thought is the ATV has issues with the files high bit rate of 20.8mbps, however this is a wild guess?
Any help would be much appreciated!
Thanks in advance.