Frame Rate Error playing back h.264 encoded files in QT

I originally posted this in the FCP HD forum, but was told that I might be able to get help here.
I really like the h.264 codec, but I have to use Quicktime Conversion, instead of QT Movie, when I export in FCP. 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

Open an H.264 video codec file on two machines (one of which is more powerful than your current one) and compare the data viewed in the Movie Info (Command-i) window.
QuickTime, by design, drops frames to insure playback. You'll see the same issue when viewing any HD movie trailers. I get poor frames rates from anything above 480.
Newer HD (1080i) videos may play at less than one tenth of the designated frame rate on older machines even though they use data rates that should (technically) supported.
Blame it on advances in computers. I remember 90X60 "videos" at 8 frames a second that would "stall" during playback. Now we all want HD movies.

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