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Oh yes they do. Have you ever tried to assign the .mp4 extension to open with something other than QuickTime? It just doesn't work, and it hasn't worked for a looooong time.



What are you talking about? That is complete nonsense.

I've never seen any video open in anything other than my default video player IINA, it's almost like quicktime isn't installed, i've never seen it pop up.


Both VLC and INIA work fine for opening .mp4 files from Finder.

When you change the file association on OSX, be sure to also click the “Apply for all .mp4 files” button. Common mistake.


Just tried changing the default to VLC for all .mp4 files, works without a hitch


IINA opens .mp4 files as the default fine for me


Most movie files, including mp4s, have been handled by mpv on my main system for a long time. No issues.


Opens fine in IINA.app on my end.




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