Re: Organize renderers by priority

On Feb 8, 2007, at 5:53 PM, Pierre-Olivier Latour wrote:

This shouldn't be needed: if your movie is a 10FPS movie for instance, the movie patch will only refresh internally at 10FPS and compute / produce a new image when necessary.

I think I did not explain my situation properly.
My Movie is a 30fps movie BUT I would accept it to play "slowly" if the computer is too loaded.
But not the text scrolling. I want this one smooth. Always.
And yes that's right, it renders only the frames needed

Ddoes your performance problem goes away depending on the type of you movie you use? If you just use the movie QCRenderer, is it smooth?

Yes, it depends on the movie.
Actually I have my problem only when two HDs movies are playing at the same time.

Therefore : no, with just the movie renderer, its not smooth.
But I would like the text scrolling to be smooth anyway... to give it a higher priority in a way ...

Try using a custom timebase on the movie patch and pass a value that does not increase continuously but in steps e.g. 0, 0.2, 0.4, 0.6, 0.8, 1.0 over one seconds will produce 5 frames instead of 30FPS

Unfortunately I use a DisplayLink to display movies and not a movie patch.

With code looking like that :

if(QTVisualContextIsNewImageAvailable(qtVisualContext, time)) {

CVOpenGLTextureRef texture = NULL;

if( QTVisualContextCopyImageForTime(qtVisualContext, nil, time, &texture) == noErr ){ // get the texture for the frame

// the above call may produce a null texture so we must check for this first

if(texture != NULL){

//Pass updated movie frames cache to the composition

if(![renderer setValue:(id)texture forInputKey:kVideoImageInputKey])

NSLog(@"Could not pass frames cache to composition");

}

CVOpenGLTextureRelease(texture);

return YES;

}

And I have another renderer for the scrolling text...

________________________________________________________
Pierre-Olivier Latour email@hidden
Quartz Composer Team Apple Computer, Inc.

References:
	>Set Structure Member Patch 1.0 (From: email@hidden)
	>Organize renderers by priority (From: Fabrice Pipart <email@hidden>)
	>Re: Organize renderers by priority (From: Pierre-Olivier Latour <email@hidden>)
	>Re: Organize renderers by priority (From: Pierre-Olivier Latour <email@hidden>)