alpha mix

    Aug 13 2008 | 7:07 pm
    i try to mix up to 8 videos which have additional alpha channel (videocollage).
    - is there a "faster" codec which supports additional alpha cannel than "animation" for jitter ?
    - can i use openGL for mixing ( ?
    - is it possible to mix more than 2 streams with jit.alphablend at the same time ? if not is there another way ?
    many thanks in advance

    • Aug 14 2008 | 2:03 am
      Slabs are definitely a good way to go for this. With slabs and, the alpha channel doesn't have to be contained in the same texture as the video RGB data. Here's a simple multitexturing videoplane example, but you could easily do more flexible stuff with a custom shader:
    • Aug 14 2008 | 10:41 am
      hi wesley,
      thank you a lot to point me in the right direction...
      it works fine with the "apply decal" funtkion for
      any codecs recommends that hold a alphacannel ?
    • Aug 14 2008 | 2:58 pm
    • Aug 18 2008 | 5:12 am
      and multiple-frame png and gif.
      On Aug 14, 2008, at 10:58 PM, Robert Ramirez wrote:
      > > animation
    • Oct 22 2012 | 2:58 am
      I'm also doing a video collage project, however I would like to mix 1280 x 720 video with alpha channels (animation codec), AND have the ability to sample either video AND adjust the layer order.
      In the patch pasted below, I used the tricks that were mentioned above, but I'm getting white pixels around the edges of the video layers. Any ideas on what I could do to get rid of these?
      Also, since I am using video which already has an alpha channel, am I barred from using the uyvy colormode/shader? i.e. [ blah @file cc.uyvy2rgba.jxs @dimscale 2 1]
      Is there anything else I should try for optimization?