Why can't I save edited Quicktime movie?
I have a video which runs fine in Mac Photos, and I can open it in Quicktime Player 10.5. If I then trim it a bit and want to save the result, I get a warning "Quicktime Player can't open Movie - the file isn't compatible with Quicktime Player" and nothing gets saved. Same things happen when I try to export at 720p.
I don't understand this - I have only used Quicktime player to do the editing, and have not tried to change the file format (.mov). What does this message mean, and more importantly how can I save my edited video?
I don't know of any other version of QT Player, and there's nothing in the App store.
I'm using an Intel iMac, running MacOS Sonoma 14.5
iMac 27″, macOS 14.5