Re: [QTTrack addImage:] and memory usage

On Apr 26, 2007, at 12:06 PM, Daniel Kennett wrote:

> Looks like I spoke too soon!
>
> It's much better, but after a while I still get malloc errors. I  
> think the movie is simple taking up too much memory as it's being  
> built. Are there any other techniques to try, such as caching the  
> video to disk as it's being built? I've watched the program in  
> ObjectAlloc and I'm not leaking anything in my code.

And another Tim replied:

> Are you using a temporary file as your movie backing store? If not,  
> there's a good example using QTKit here
>
>         http://developer.apple.com/samplecode/QTKitCreateMovie/

Good advice. Another thing to keep in mind is that QTTrack's addImage  
does not currently perform any interframe (or temporal) compression  
on the images added to the specified track. If the images you are  
adding are sufficiently similar to one another from frame to frame,  
you are probably better off ditching addImage and dipping down into  
the QuickTime C API for this part of your application.


Tim Monroe
QuickTime Engineering

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