It's worth also checking how long each .qtz takes to render. Perhaps take a look in the opengl monitor to see how much vram is being used, if it's reaching a point where it's out of vram and has to swap a lot of textures in and out that might cause an occasional slow frame.
What are the compositions doing? Can you dump them all into QC and see if it works ok there? Chris On 29 October 2010 09:10, Rua Haszard Morris <[email protected]> wrote: > I'm trying to use a transition patch to transition between the output of > two > other animations. The problem I'm having is that sometimes this is not > rendering > fast enough to be rendered in real time. It seems that rendering a frame of > the > transition qtz occasionally balloons out to 1.5 s. > > I've written a test loop to investigate what's happening, and it seems that > every 9 or so seconds, the render takes a second or more, as opposed to the > usual <0.05 s. > > What should I do to optimise the rendering of these animations? I'd like to > be > able to render full screen (i.e. 1280x720+) and in real time, e.g. at frame > rates of 30 (ideally 60) per second. I'm sure this must be possible with > Quartz! > > Here's the (quick & dirty!) test code. Tests were run on a 2.4 GHz MacBook > Core > 2 Duo with 2 GB. > > > NSString* inputQtz1 = [[NSBundlemainBundle] > pathForResource:@"InputA"ofType:@"qtz"]; > NSString* inputQtz2 = [[NSBundlemainBundle] > pathForResource:@"InputB"ofType:@"qtz"]; > NSString* mixQtz = [[NSBundlemainBundle] > pathForResource:@"Dissolve"ofType:@"qtz"]; > > // open qtzs > QCComposition* qtz1 = [QCComposition compositionWithFile:inputQtz1]; > QCComposition* qtz2 = [QCComposition compositionWithFile:inputQtz2]; > QCComposition* qtzmix = [QCCompositioncompositionWithFile:mixQtz]; > > // args > NSDictionary* transitiond = [NSDictionarydictionaryWithObjectsAndKeys: > QCCompositionInputPreviewModeKey, [NSNumbernumberWithBool:YES], > NULL > ]; > > // set up renderer(s) > CGColorSpaceRefco = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); > QCRenderer* renderer1 = [[QCRendereralloc] > initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co > composition:qtz1]; > QCRenderer* renderer2 = [[QCRendereralloc] > initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co > composition:qtz2]; > QCRenderer* renderer3 = [[QCRendereralloc] > initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co > composition:qtzmix]; > > // now render a frame at a time for a while and see how long it takes > double tmp, max=std::numeric_limits<double>::min(), > min=std::numeric_limits<double>::max(), total; > int count = 0; > NSTimeIntervalelapsed = [NSDatetimeIntervalSinceReferenceDate]; > for (NSTimeInterval time=0; time<60; time+=1.0/60.0) > { > NSAutoreleasePool* pool2 = [NSAutoreleasePoolnew]; > > elapsed = [NSDatetimeIntervalSinceReferenceDate]; > [renderer1 renderAtTime:time arguments:nil]; > [renderer2 renderAtTime:time arguments:nil]; > [renderer3 renderAtTime:time arguments:transitiond]; > > tmp = ([NSDatetimeIntervalSinceReferenceDate]-elapsed); > std::cerr << "render " << time << " took " << tmp << std::endl; > elapsed = [NSDatetimeIntervalSinceReferenceDate]; > count++; > > [pool2 release]; > > if (tmp < min) > min = tmp; > if (tmp > max) > max = tmp; > total += tmp; > } > > std::cerr << "min " << min << std::endl; > std::cerr << "max " << max << std::endl; > std::cerr << "total " << total << std::endl; > std::cerr << "average " << total/count << std::endl; > Thanks in advance - I'm sure there's something obvious I'm not doing that > would > speed this up.. > Rua HM. > > -- > http://cartoonbeats.com > http://haszaristwocents.blogspot.com > http://myspace.com/haszari > http://last.fm/music/Haszari > > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/quartzcomposer-dev/psonice%40gmail.com > > This email sent to [email protected] >
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