I have a project that rendered last night where one of the source movies blinks off and on. It's like some of the background render engines weren't processing that Quicktime movie at all.
From the log, it appears that the background engines eventually stop contributing any frames and AE foreground app did all the rendering on its own. And from that point on, the render is fine. (And yes, all the source footage is without errors)
Any ideas about why certain background engines would process footage correctly and some would omit it completely? And why they would eventually stop contributing frames at all?
Mac Pro (mid 2010) dual hexacore, 32GB RAM, ATI 5780, AE 10.0.1
Using Todd's new recommended settings:
10GB Reserved for other apps
3GB minimum per instance
Resulted in 6 background instances.
It could be that the rendering task was too lightweight. In the case of basic transcoding on a fast machine, it's often more efficient for the foreground process to do all the rendering. In this case, the internal server will try the background processes, but if it finds the time taken to marshall and collect the background frames is more expensive than having just the foreground process do the rendering, it will revert to the non-mp case for this render.
But I'm not just transcoding. I'm using Keylight, a few dozen layers all with effects, track mattes, masks, motion blur, lens flares, glows, particles. It's nothing extraordinarily complicated. But it's a fairly decent project 1080p pixels to crunch.