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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This makes me happy, open source developers fighting over trivialities always makes me so sad.
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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Good stuff. I always forget what specifically is the reason premultiplied alpha is the better way
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Mostly because all the math makes a lot more sense if you actually write it out. More importantly, with premultiplied alpha you can just scale the image normally (each plane separately), with straight alpha that is incorrect.
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