[QTTrack addImage:] and memory usage

Good afternoon all.

I'm developing an application that allows you to place animated  
graphics objects on top of a video, in a similar fashion to Motion.  
When exporting the video, a track is added to the movie and the  
graphics are added on a frame by frame basis. Obviously, this creates  
a *lot* of images. Here's my loop:

for (time = 0; time < duration; time += 40) {
  NSImage *image = [[NSImage alloc] initWithSize: size];
  [dataView drawIntoImage:image forTime:time];
  [track addImage:image forDuration:QTMakeTime(100, 1000)  
withAttributes:imageDict];
  [image release];
 }

[dataView drawIntoImage:] simply locks on to the passed image and  
draws into it, and doesn't retain or release anything. size is an  
NSSize equivalent to the natural size of the movie. The imageDict is  
set up as follows:

NSDictionary *imageDict = [NSDictionary dictionaryWithObjectsAndKeys:
            @"tiff", QTAddImageCodecType,
            [NSNumber numberWithLong:codecHighQuality],  
QTAddImageCodecQuality, nil];

It works just fine, but exporting a video that is 19 seconds long at  
25fps (== 475 images) at 1056 x 576 causes the program's memory use  
to shoot up to 2.5Gb from a couple of hundred megs. Anything much  
bigger/longer causes the memory usage to exceed the 4Gb limit and  
spew malloc errors everywhere.

I don't *think* that this is wrong - I'm creating 475 big images and  
adding them to a movie. However, is there a method of doing this that  
uses less memory?

Thanks,

-- Daniel 
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