Quote Originally Posted by NM64 View Post
First off, just plain-old double-clicking on the "mpv.exe" file and then dragging-and-dropping an h.264 MP4 video file into the mpv program window resulting in the video playing back without issue on both the AMD and Intel PC(s).

But when I tried to run mpv from the command line via your command line arguments, I got the following on both the AMD and Intel PC(s):

Try the following command line arguments instead:
mpv --gpu-context=win --vo=gpu --msg-level=all=debug /path/to/video.mp4
(while replacing /path/to/video.mp4 with a path to a video file)