black turns into white…

Mar 8, 2006 at 5:38pm

black turns into white…

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

#24779
Mar 8, 2006 at 6:03pm

#72205
Mar 8, 2006 at 6:14pm

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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#72206
Mar 8, 2006 at 7:11pm

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

#72207
Mar 8, 2006 at 7:50pm

#72208
Mar 8, 2006 at 7:59pm

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

#72209
Mar 8, 2006 at 9:01pm

thank you all,
i try with tiff now, and so far the white days are over.
best
klaus

#72210

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