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 <[EMAIL PROTECTED] > 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 > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list >
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