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RAM Preview and Render have CRAZY artifacts - CS3

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Tim Avery
RAM Preview and Render have CRAZY artifacts - CS3
on Sep 12, 2012 at 9:54:59 pm

I am trying to composite several render passes (Ambient occlusion, Diffuse, and shadow) into after effects CS3. All footage was created in AE CS3 and is 1280 x 720, 29.97, H.264 .mp4

PROBLEM: Whenever I render or RAM preview the composite, I get serious artifacting. The different render passes look fine (i.e. No artifacting on original footage). And when I put the CTI over each frame of the composite in AE, it looks fine. It's only when I try to render or preview the composite is when I get the artifacting.

Image of artifacting:

What it's supposed to look like:

NOTE (Additional problem?): I can only ram preview the composite once, after that I get the "Need 2 frames to preview" error when trying to RAM preview. No matter what I do (comp restart, AE restart, purge, and cache clean), I still can only preview once, then get the error.

Project Settings and attempted solutions:
OpenGL is off (I can't turn it on)
Adaptive resolution is on
Multiprocessing is off
Prevent DLL fragmentation is on
Disk Cache is enabled (2 GB)
Max memory usage = 90% of 2 GB
Max RAM cache size = 30% (keep getting "not enough memory" error without these low settings)
I also tried different render settings as well. But nothing seems to work.

Windows 7, 32 bit
Intel Core 2 Quad 2.66 GHz
ATI FirePro V3800 (FireGL)

Thanks in advance for your help!

- Tim

EDIT: I have been using this set up for several years and this has never happened before. Although this is the first time I'm trying to composite different render passes. Thoughts?

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Tim Avery
Re: RAM Preview and Render have CRAZY artifacts - CS3
on Sep 13, 2012 at 2:42:34 pm

Found the solution.

--> Don't render in a compressed format (i.e. MP4) if you are going to composite them later <--

There is information lost when trying to re-render a compressed format and AE freaks out (artifacting, RAM preview errors, etc). At least that is what I gather from other topics.

I'm trying lossless right now. More details to come.

Hope that helped.

- Tim

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