How long have we said that VLC is the best way to view “almost” any video file, regardless of the extension?
Well, MPV will display ANY video file, regardless of extension - or so it is touted. The interface is simple and easy to use. There is an executable for macOS, not sure about iOS. Although there is no official GUI, when I installed and ran it, I got this:
Check out MPV here: https://mpv.io/
John R. Carter Sr.