Frame Rate Issue Exporting .mp4 using h.264 compression

I really like the h.264 codec, but I have to use Quicktime Conversion, instead of QT Movie, when I export. I get a 'Codec Error' when I try to export as a QT Movie. That is the first problem, but I work around it.
The frame rate issue comes up when I try to export at larger screen sizes like 640x480. I have no problems at 320x240, but when I move up to the larger screen sizes the resultant QT mp4 plays back at 1/2 the specified frame rate, no matter what frame rate I try. It is really bizarre.
I tried lowering the key frame number to reduce the processor load on playback, but this had no effect. This was a tip I picked up here.
I tried lowering the bit rate, too. The only thing that 'fixes' it is to go back to the lower screen size.
The problem is reproducible when the file is played on other (faster) computers.
Any ideas?
thx
mike
G4 500MHz Mac OS X (10.3.9) FCP 4.5 HD

Mike,
Try posting this in the Quicktime forum. Pehaps those smart folks can shed some light on your issue.
Good luck.
x

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aaronfronk wrote:
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http://en.wikipedia.org/wiki/QuickTime#Container_benefits
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