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