Nvidia Shield plugged into my TV running Jellyfin. Occasionally if I get playback issues I’ll open with an external player like Just Player, Vimu, VLC, etc.

Jellyfin used to be pretty rough with playback, especially if you watch with subtitles, but in recent months I’ve rarely had playback issues.

On PC I use mpc/madvr, but usually just to check a video file, not to watch a whole movie. I save that for the TV.