@Myrsloik: But in the b64a data I get back from Vapoursynth / AVFS I have to tell After Effects to ignore the alpha channel, otherwise everything is 100% transparent. Is this just random what it's filled with or do you write some filler data somewhere? If you write alpha data, is it you returning 'full transparent' or is After Effects at fault by interpreting everything as transparent? (Like I said, I can tell AE to ignore alpha, so no big issue at all!)
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