Hard stuttering occurring in H.264 renders out of AE CS5

Hi There,
This problem just started ocurring, and I'm not sure how to troubleshoot the problem. It may be related to some OSX upgrade, but it is incredibly annoying.
I have a 60 second animation with most of the source footage being Targa sequences that I exported out of my 3D graphics application. When I RAM preview my final composition in AE, everything looks great, syncing is fine, etc. However, when I render the composition with the H.264 codec, and play it back on Quicktime there is an extreme amount of stuttering all throughout the animation--during fast moving parts and slow moving parts. I've done some reading online here and at Creative Cow and most people say its related to the codec, but it just started ocurring. I've rendered out to H.264 without this issue. I'm wondering if there was a switch I set that is causing the problem? Has anybody ever experienced this with H.264? When I render out to Animation it's okay, but I simply cannot deliver that file to my client for review since it is so hefty.
Has anybody come across this issue? I'm running OSX Lion 10.7.3 with 8GB of RAM with a 2.66Ghz Intel Core i7.
Thank you for you time and help!

> When I RAM preview my final composition in AE, everything looks great, syncing is fine, etc. However, when I render the composition with the H.264 codec, and play it back on Quicktime there is an extreme amount of stuttering all throughout the animation--during fast moving parts and slow moving parts. <
RAM preview is not comressed to H.264 so of course it willplay perfectly.
H.264 is REALLY compressed but playing it back requires some beefy processor, especially if you're trying to do full 1080HD. As Dave says, go to Aniation and use AME to do the transcode. This has many benefits but mostly you're using a compressor applicaiton to do the compressing. And you have a completely perfect copy of the project form which you can create new copies in any codec or format. You cannot easily , for instance, use AME to move form the H.264 to WMV.
Brings up another question: why are you using H.264 at all? I'm asking because 90% of the answers we see to that question are incorrect from a technical point of view and inappropriate from a workflow POV.

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