Re: Fastest way to pass images from one QCComposition to another

Re: Fastest way to pass images from one QCComposition to another - QCPortImage? CVPixelBuffer?

Subject: Re: Fastest way to pass images from one QCComposition to another - QCPortImage? CVPixelBuffer?

Date: Fri, 8 Feb 2008 13:40:40 -0500

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Yowza!

So I was retaining an CIImage * sourceImage on applicationDidFinishLaunching and set the sourceImage for one renderer, pass it to another, and also show it in a simple preview window which was also openGL. Id create my CIImage with emptyImage

My patch, with a render timer at 60fps would output around 20/25 fps.

Now, I have:

- (void) applicationDidFinishLaunching:(NSNotification*)aNotification

{

sourceImage = [[QCRenderer QCImage] retain]; // I have no clue if this is correct, but it seems to work.

}

and within my renderers I simply call ofType: as you suggested, like so:

sourceImage = [v001SourceRenderer valueForOutputKey:@"SourceOutput1" ofType:@"QCImage"];

My FPS now matches exactly that of QC. If I pump up my preferred rendering speed, I can get a solid 60FPS, which I cant even get QC to do.

Changing two lines of code, to change my FPS that drastically is huge.

Thanks!

On Feb 8, 2008, at 12:47 PM, Troy Koelling wrote:

It will be better to use that opaque type than CVPixelBuffer because it will be more flexible. If the internal representation one day turns out to be a CIImage instead, then passing it as a QCImage will not make a costly conversion.

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References:
	>Fastest way to pass images from one QCComposition to another - QCPortImage? CVPixelBuffer? (From: vade <email@hidden>)
	>Re: Fastest way to pass images from one QCComposition to another - QCPortImage? CVPixelBuffer? (From: Troy Koelling <email@hidden>)