Start here and make sure that you understand how RAM preview is supposed to work first:
What version of After Effects? Have you installed the recent updates? What operating system? What kind(s) of source footage? Has this ever worked before? What other software are you running? Do you have any third-party effects or codecs installed? Are you rendering with OpenGL?
What are your Memory & Multiprocessing settings? Are you using Render Multiple Frames Simultaneously multiprocessing?
i have after effects cs5. i have windows 7. it was mainly call of duty footage, resulotion 1280 x 720 and 60 fps. all my problems worked before this happend, all the time! i wasn't running anything but after effects. i'm not rendering with OpenGL.
> i have after effects cs5
What exact version? You dodn't answer my question about the updates.
> it was mainly call of duty footage, resulotion 1280 x 720 and 60 fps.
What format and codec?
You didn't answer my questions about memory and multiprocessing.
after effects CS5 64bit version 10.0
i havn't installed any updates.. but after effects worked fine 4 days ago, so unless there's new updates i guess that's not the problem.
format MP4, i dont know about the codec.
i dont know what memory and multiprocessing settings i have, but as i said.. it worked fine a couple of days ago
You may have done something with your CoDecs on a system level which may relate to your whole capture setup. Could be the CoDec itself, could be the OpenGL and hardware acceleration settings it affects (in addition to running the game). Impossible to diagnose from a distance, but if something that worked 4 days ago doesn't work now, something has changed, no matter what. So if you did change something in your graphics card settings, installed a CoDec pack or a new version of FRAPS or whatever capture tool you are using, undoing those changes might resolve the issue...
the gameplay was from xbox recorded with a hd pvr, and i havn't done anything but installed mw2 on my computer, just can't understand how that can affect after effects :/