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I'm intrigued - what's the purpose of your project?
I don't like your chances at success for this. Turn off all RAM cacheing using the Secret Preference pane.
Is it possible to render the project in segments, say 1000x1000 pixel blocks, and recombine them later?
It's a very large video mosaic.
The next time it fails I'll try disabling the RAM cacheing. So far, after purging the cache it's done 40 frames (at a relatively speedy 1.5 minutes per frame) since the last failure.
Random question: does rendering with caps-lock on reduce the demands on ram, because it's no longer compelled to DISPLAY these images?
Technically, no, but it can't hurt! :-)
Mmh, yeah, per se there is nothing that should stop you from rendering such a file. It's pushing the limit of course, but should work. If it's still too much, depending on your project structure you may be able to render tiles of it and assemble those later on e.g. using Photoshop actions. since you speak of some sort of mosaic, this seems a viable "solution", though certainly not the preferred one, naturally.
> It's a very large video mosaic.
So how is it being displayed? What hardware is outputting it?
I'm not sure if AfterEffects is the right tool for this. As others have said, you are pressing the upper limits AE's image memory. Have you considered Shake or another nodal compositor?
We get questions like this often around here and I, too, will be interested by the destination for this rendering.
Such a mosaic cannot be displayed from a single device so it's not necessary at all to render it as a complete frame. If you are going to a digital signage system, there are workarounds for importing the source video that should be provided by the signage driver's mfr. If you're going out to several synced display systems, render them as individual movies.