OBS tip: if you want to use video sources (or Stinger wipes) with pixel-perfect display and alpha channels, use the ffv1 codec. It supports RGBA, so it plays well with PNGs and other RGB content. ProRes 4444 on the other hand has some nasty chroma siting issue.
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Okay fair point. I still don't understand why the aac codec/obs people got into a fight with you rather than actually doing anything
The ffmpeg dude who dismissed everything was, shall we say, a "known colorful" personality in the project (and several other ffmpeg devs apologized for him). The aac encoder dev I think is actually looking at some improvements now, so it might get better.
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This makes me happy, open source developers fighting over trivialities always makes me so sad.
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The OBS folks also fixed the prores issue (not merged yet), my previous nonpremultiplied alpha problem is in the back burner due to it being a more complex change and workaroundable.
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Does ProRes specify an alpha encoding? I checked the white paper and found nothing stipulating the type of alpha, whether associated or unassociated?
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There is an ALFA udta atom in such mov files, I'm not sure who specified it but at least Adobe uses it.
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