So what aspects of the player and the server define the quality of the file being viewed? I play the file on media player classic on my emby server and any of my other devices (except the android player) and it plays perfectly.
Consistently h264 and h265 files battle to play when streaming from emby (whether I play them via chrome on the media server or not).
I'm assuming the server is doing what it's supposed to as you have reviewed the logs so then maybe it is a performance issue. Some guidance in relation to my question will help establish what I need to do.
@Luke, you indicated that moving the emby server to the android tv player may not help so I'm at a loss to understand what affects performance.