I'm no expert on this - still grappling with more complex issues - but here's a 
fairly simple google code project which renders qtzs to video files. 
http://code.google.com/p/qtzrendang/

Depending on your needs this may be helpful - good luck :)


----- Original Message ----
> From: Nick Bonatsakis <[email protected]>
> To: [email protected]
> Sent: Mon, 1 November, 2010 3:48:31 PM
> Subject: render quartz composition to video file via code
> 
> Hi Everyone,
> 
> I'm new to Quartz Composer but not to Cocoa programming. I  have
> created a Quarttz Composition with several outlets. The idea is  that
> the user of my application will set values for several outlets,  and
> then I would like to produce a video file of the rendered  composition.
> Is this possible to do with the Cocoa APIs? I have been reading  the
> Quartz Composer Programming Guide, but haven't been able to figure  out
> how to do this.
> 
> Thanks a ton!
> 
> -- 
> Nicholas  Bonatsakis
> Software Engineer
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