What is the best video codec for use in Keynote?

I need to play some videos in a Keynote presentation. They can be 320x480 if necessary. Is there a recommended codec to use that minimizes playback stutter, dropped frames, bad audio sync and crashing the program?

David,
I also am having trouble with video in Keynote. I tried MPEG-4 and H.264 at 640 x 480 x 29.97fps (the "Web Download - LAN" setting in Compressor), but I always get pretty bad stuttering on playback. Is there any magic compression setting I'm missing here?
I'm playing it back on various machines with the same results - 1Ghz G4 iMac / 1.3 Ghz iBook / Dual 1.42 Ghz PowerMac. None of them have super beefy memory (512 - 768MB) but I'd think the stuttering issue would be with the processor not being able to keep up, no? Or is this task handed over to the video card?
The luck I've currently had as been with the Motion JPEG video codec. IIRC, it is supposed to be very light on the processor during playback so the overhead of Keynote doesn't seem to affect it as much. The trade off is the video files are huge.
Thoughts?

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