Playing transparent video layers



  • Hey everyone,

    I have a problem with Isadora video playback. I have prepared some still animation, which was rendered out from
    .png files to a .mov file with an alpha channel. Isadora does not seem to understand that the layers should only
    contain a figure data and no background. Changing the blending modes does not help neither, additive and transparent
    modes just create transparent figures and opaque just brings in a black background.
    Any help appreciated
    Tadas


  • Try different render options. I am sure there is something that in not right.

     I use transparencies a lot. Usually I render into PNG or ProRes or HAP with alpha(millions colors+). The most effective way to layer transparencies in Isadora is to set each Projector to different layer (0;1;2;3....0 being the bottom one). and blending to T.


  • So in the case of three layers (background, figure 1 and figure 2) you would use three movie players and three projectors?



  • Dear @vienastadas

    What codec did you use when exporting the movie files? Choose **Window > Show Movie Inspector** to see what codec it says there -- it will be next to the word "Format"
    Best,
    Mark


  • Hey Mark, I am running Isadora on Win, and I do not think there is a way to check codecs.



  • @vienastadas

    Yes, several movie players and projector pairs are one way to do this(I thought you are using this method). I recommend to try to re-encode the movies using PNG+ codec and see how this plays out. It should work on windows as well as on mac.
    There is very good codec for both platforms that Resolume developed - DXV that supports alpha as well.
    https://resolume.com/software/codec


  • Dear @vienastadas

    Are they WMV or AVI files? If so, here's a tool to do it: http://www.moviecodec.com/solutions/how-to-identify-the-codec-of-a-video-file-61931/
    Otherwise, if they are QuickTime movies, the same command I listed previously is in the Windows version of QuickTime player.
    Best,
    Mark

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