Shaders work well for this type of compositing. I don't think there is any need to store the alpha value in the video file.
On Fri, Aug 1, 2008 at 7:25 PM, Spencer Russell <spencer.f.russell@gmail.com
wrote:
I'm mixing video by background subtracting it and then setting the background transparent (alpha = 0), then texturing each video onto overlapping rectangles to achieve a compositing effect.
I need to record the different videos with [pix_record] and then play them back later while preserving the alpha somehow, so I was thinking that I could just replace all the transparent part with bright pink or something and store it as regular photo jpeg frames, and then later set all the bright pink parts to transparent when I read the video back.
I'm having trouble with both sides of the conversion, though. Perhaps there's a better approach entirely?
thanks, spencer
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