// if there is a frame available from a quicktime movie
if(QTVisualContextIsNewImageAvailable(_visualContext, NULL) &&
(QTVisualContextCopyImageForTime(_visualContext, NULL, NULL,
&imageBuffer) == kCVReturnSuccess)) {
// convert frame to a CIImage
CIImage* inputImage = [CIImage imageWithCVImageBuffer:imageBuffer];
// send the new CIImage to the renderer input
if(![_renderer setValue:inputImage forInputKey:kRendererImageInput])
NSLog(@"Could not pass frames cache to composition");
It's better to pass directly the CVImageBuffer (see
http://developer.apple.com/technotes/tn2005/tn2143.html)
OK -- that's a good point. But in my actual application, I'll almost
always being passing in CIImage -- so I did the conversion just to
test that I could do it.
Nevertheless, I changed the code to pass the CVImageBuffer instead.
Still no output.
// tell it to render
// ??? Can I pass 0 for the time ???
[_renderer renderAtTime:0 arguments:NULL];
Yes 0 is definitely a valid value
// get the output image
NSImage* outImage = [_renderer valueForOutputKey:kRendererImageOutput];
if(!outImage)
NSLog(@"Could not get output image to composition");
The problem is that the output image is always NULL. Any ideas?
Can you post the composition somewhere - it's difficult to say
without seeing it?
Well, it's pretty simple. It's one module: Crystallize, with the
Image input published as 'imgin' and the Image output published as
'imgout'.
Is there anything about the Crystallize module itself that would
cause it not to work?
I tried changing it to "Color Invert" but it still didn't work.
Best,
Mark
--
=====================================================================
Mark Coniglio, Artistic Co-Director | email@hidden
Troika Ranch Dance Theater | http://www.troikaranch.org
=====================================================================
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