Yes, Keylight is an evil little toad... Have you downloaded the latest version/ updates from the The Foundry website? What kind of footage are you working with and what are your project settings?
Since you run AE 9, it's probably your footage. Okay, it's the most likely cause, at least. Here's a copy 'n paste response I used to use a LOT on the Creative COW:
Dave's Stock Answer #1:
If the footage you imported into AE is any kind of the following -- footage in an HDV acquisition codec, MPEG1, MPEG2, AVCHD, mp4, mts, m2t, H.261 or H.264 -- you need to convert it to a different codec.
These kinds of footage use temporal, or interframe compression. They have keyframes at regular intervals, containing complete frame information. However, the frames in between do NOT have complete information. Interframe codecs toss out duplicated information.
In order to maintain peak rendering efficiency, AE needs complete information for each and every frame. But because these kinds of footage contain only partial information, AE freaks out, resulting in a wide variety of problems.
I'm a Mac guy, so I like to convert to Quicktime movies in the Animation or PNG codecs; both are lossless. I'll
I am updated on AE updates... What's the foundry website? I'm using Apple Pro Res HQ for my footage. What specifically about the settings? It's a 1920 X1080 project with 23.98 frame rate. Thanks so much for your help
I'm using Apple Pro Res HQ. Is there anything wrong with that codec? Thanks so much for your help.
Unfortunately, 8 gigs isn't exactly tons of RAM anymore. I have a dual quad-core Mac Pro with 8 gigs at work, and I don't even bother using multiprocessing.
It could also be that you're trying to use Open GL acceleration for rendering, which is something Adobe employees don't even use... and you shouldn't, either.
A final thing: DO NOT make your comp's frame rate 23.98! That's just Final Cut Pro-Speak for the actual frame rate, which is 23.976. Use 23.976 in AE and things will look good in FCP. Use 23.98 in AE and things will look screwy in FCP.
Oh, there's nothing wrong with ProRes HQ. It gives you fine-looking images.
You also get the added benefit of much larger file sizes for no increase in image quality over regular ProRes 422.
It's just that many people try using long-gop footage in AE 9, causing all sorts of problems.
Thanks for all your help. What's Open GL acceleration? How would I know if I'm doing that?
Thanks, I unsellected that, and nothing. I just tried rendering out the same project with my 4 year old Mac Book pro 2.4 Ghz intel core duo with 4 GB or Ram and the project rendered without issue. I have no idea what's going on with the IMac.
It could be an issue with AE 9 and Lion; I presume that's OS on your brand-new machine. AE 9 doesn't know about Lion.