www.makemkv.com

+1 for mkvtoolnix. I'd be tempted to run the MKV through Handbrake (so you can be sure the video matches the original), then use mkvtoolnix to copy the video stream from the new MKV into the old MKV, leaving everything else intact.

These are the results I'm getting on Nvidia shield Pro: On plex: .ts single track dual layer: dolby vision and atmos (no pgs subtitles working AFAIK) .mkv: dolby vision and atmos ( no pgs subtitles working) I use MKV on Plex on my 2019 Shield Pro and it works well, but I sometimes find it takes 2-5...

I've noticed that Plex on Apple TV will not play a .mkv with DV if the audio is True-HD/7.1. Plex forces the audio to transcode rather than direct play, and the DV becomes HDR10. If you change the audio track to something else, like AAC, the DV ends up playing fine. No such problem on Nvidia Shield...