#mp4editing — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #mp4editing, aggregated by home.social.
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You may be able to do it with a command-line utility like mp4tags or ffmpeg. In a search for that just now, I turned up a bunch of editing utilities. Others probably know better if this isn't a good solution.
https://man.archlinux.org/man/extra/libmp4v2/mp4tags.1.en
https://ffmpeg.org/