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It's worth reading the section of the article that details why this isn't a great solution: https://jakearchibald.com/2024/video-with-transparency/#vp9--hevc-so

• whywhywhywhy 2y ago
  It works fine in practice, the reason they're struggling is they don't know about Apple's avconvert command is the only real route to do it. avconvert -p PresetHEVCHighestQualityWithAlpha -s ./input.mov -o ./output.mov is the trick
  • jaffathecake 2y ago
    They do know about avconvert (I am the article author). avconvert gives you almost no control over the output. You'll end up with a file orders of magnitude bigger than the alternatives covered in the article. Compressor is the next best thing, as it gives you some control, but you still end up with a file multiples bigger than the ideal solution.