I wouldn’t even know how to hold a local music library on macOS these days. The app that used to be iTunes is now just called Music right? It’s way confusing for me but I also don’t daily drive the OS anymore. I have my stagnant library in Subsonic which in itself is a stagnant product but you know how it is with Spotify these days.
I didn’t know MOV has a more accessible license than MP4 but yea MP4 in itself is hardly what one ever wanted to hold their content in. All I know about MOV is that back in the XP days obviously Windows couldn’t play them out of the box. Not that WMV (lol) was any more desirable. I guess most of my stuff back then was AVI.
Do Apple still sell Music in that app?