<div dir="ltr">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.<br><br><div class="gmail_quote">On Fri, Aug 1, 2008 at 7:25 PM, Spencer Russell <span dir="ltr"><<a href="mailto:spencer.f.russell@gmail.com">spencer.f.russell@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I'm mixing video by background subtracting it and then setting the<br>
background transparent (alpha = 0), then texturing each video onto<br>
overlapping rectangles to achieve a compositing effect.<br>
<br>
I need to record the different videos with [pix_record] and then play<br>
them back later while preserving the alpha somehow, so I was thinking<br>
that I could just replace all the transparent part with bright pink or<br>
something and store it as regular photo jpeg frames, and then later<br>
set all the bright pink parts to transparent when I read the video<br>
back.<br>
<br>
I'm having trouble with both sides of the conversion, though. Perhaps<br>
there's a better approach entirely?<br>
<br>
thanks,<br>
spencer<br>
<br>
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