black turns into white…
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
i made a test-patch, that makes the effect a little more often by
time-messages to jit.qt.movie.
the test-patch there is qttester.pat
the test-movie Running.gif
and some screenshots:
thats the correct look:
(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
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
then after a while, or after time-messages with some more cpu the
same thing happens…)
thanks for your time
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
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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On Mar 8, 2006, at 7:14 PM, vade wrote:
> Thats odd. I see you are loading a Gif animation. Does it have an
> 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?
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.
thank you all,
i try with tiff now, and so far the white days are over.
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