black turns into white...


    Mar 08 2006 | 5:38 pm
    hello, we are totally lost in a very basic, very annoiing problem.
    jit.qt.movie unpredictably changes the black background-colour of a simple movie to white. i did a lot of testing on various machines and its not possible to strip it down to a patch that always does it wrong. basically i get the result by simply loading the movie in jit.qt.movie.help.
    i made a test-patch, that makes the effect a little more often by sending time-messages to jit.qt.movie.
    http://lloopp.klingt.org/test/ the test-patch there is qttester.pat the test-movie Running.gif
    and some screenshots: thats the correct look: http://lloopp.klingt.org/test/Picture%2028.png (the movie is an animated gif with 8 frames like this) and the thing i am talking about is, that now and then the output is like that: http://lloopp.klingt.org/test/Picture%2027.png or http://lloopp.klingt.org/test/Picture%2026.png sometimes i get a totally white frame.
    please, if somebody saw things like that already, i would be very pleased to get a hint what might be wrong, and how to workaround.
    (i tried exporting into several formats, sometimes that makes it better, but then after a while, or after time-messages with some more cpu the same thing happens...)
    thanks for your time klaus

    • Mar 08 2006 | 6:03 pm
    • Mar 08 2006 | 6:14 pm
      Thats odd. I see you are loading a Gif animation. Does it have an alpha? try loading it into Image Ready and re-saving it. Perhaps the gif is messed up. Ive run sprites through jit.qt.movie with alphas just fine - although they were converted to a QT movie with animation codec.
      is it any movie/gif sprite, or just that specific movie?
      does quicktime player proper show those issues?
      v a d e //
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    • Mar 08 2006 | 7:11 pm
      On Mar 8, 2006, at 7:14 PM, vade wrote:
      > Thats odd. I see you are loading a Gif animation. Does it have an > alpha? no > try loading it into Image Ready and re-saving it. Perhaps the gif > is messed up. yes, as i said resaving or making a mov helps at first, but then when having it in a more computing environment the bug is back again. this animated gif is just giving me the wrong 255s more often.
      i know, the worst thing about it, is that its not always reproduceable. (eg my machine has qt 7.0.4 and another one with qt 6 did not show the same bug) > Ive run sprites through jit.qt.movie with alphas just fine - > although they were converted to a QT movie with animation codec. > > is it any movie/gif sprite, or just that specific movie? it is with several movies, although they all came from the same source. > > does quicktime player proper show those issues? yes
      thanks anyway klaus
    • Mar 08 2006 | 7:59 pm
      FWIW, we don't do anything special w/r/t different codecs. So this problem sounds specific to QT's GIF decompression. I would recommend converting to another alpha channel supporting codec like Animation, TIFF, or PNG, which should work well in Jitter.
      -Joshua
    • Mar 08 2006 | 9:01 pm
      thank you all, i try with tiff now, and so far the white days are over. best klaus