I was a happy camper once I saw the 80+ Mbit/sec h.265 file playing back nicely again. I found out it was a buggy Plex server version and a recent upgrade fixed this issue. These are 4K rips straight from 4K disc where I used MP4tools and ffMPEG to create an MP4 muxed stream containing the original H.265 track from the disc and a Dolby Digital or Dolby Digital Plus sound track. Plex would constantly choke, stutter, pause playback on these files. The one thing I did have an issue with for a while was streaming high bitrate H.265 files to the AppleTV 4K. The recent server versions may have fixed this issue and this fix may not be needed anymore. I always conform my Handbrake encodes to H.264 High Profile, Level 3.1 or 4.1 depending if SD or HD which the recent AppleTV's handle without issue. You don't need to do this modification so long as your Plex server has enough CPU to transcode on the fly. Before I did that, Plex would always want to re-compress the file on the fly and eat up server CPU (not to mention compressing to a lesser quality). Plex works fine on both once I made a modification to the TVOS profile so that it will DirectPlay my Handbrake files.
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