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QCView and multithreading

Hi,
I am using QC composition in application and need to read output image from "Video Input". When I do it in method that is called by NSTimer everything works fine, but when I try to execute this method from CoreAudio IO proc, program runs for a few seconds and crashes with NBTVSource has exited due to signal 10 (SIGBUS).
Here basically what I am trying to do:

-(void) processVideo
{
    NSAutoreleasePool * thePool = [[NSAutoreleasePool alloc] init];
    NSImage * videoImage = [qcView valueForOutputKey:@"VideoImage"];
    [thePool release];
}

I removed all processing code from the method except of the above and still has the same crash. Of course when I run from timer there is no NSAutoreleasePool alloc or release.

Any help will be greatly appreciated.

Thanks,

Sergei Ludanov
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