klaus filip

we are totally lost in a very basic, very annoiing problem.

jit.qt.movie unpredictably changes the black background-colour of

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 

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 

http://lloopp.klingt.org/test/Picture%2027.png

http://lloopp.klingt.org/test/Picture%2026.png

please, if somebody saw things like that already, i would be very 

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 

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...)

black-turns-into-white

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?

I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I 

You will not be saved by the Holy Ghost. You will not be saved by the 

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.

I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I  
LIVE! I LIVE! I LIVE! I LIVE!

You will not be saved by the Holy Ghost. You will not be saved by the  
God Plutonium.

> 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 

yes, as i said resaving or making a mov helps at first, but then when 

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 

> 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?

> 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

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.

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.

i try with tiff now, and so far the white days are over.

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


black turns into white...