720P 30 H.264 videos stutter when played back on Windows

720P 30 H.264 videos stutter when played back on Windows
I have an interesting problem that I am hoping someone can help me with.
I have several short videos (2-4 minutes) in 1080i HDV that I have edited in FCP. When output to 720P 30 H.264 in Compressor at either 10 or 6 MB they look just drop dead gorgeous when played back on either of my dual processor Macs.
However when played back on a Windows machine with QuickTime 7, they stutter to the point that playback locks up. This happens on 1.5 GHz to 3.2 GHz P4 class machines with 512 MB to 1 GB of RAM and 64 to 128 MB video cards. On the 3.2 GHz P4, the processor utilization peaks at 100%. The interesting thing is that all of these same Windows machines have no problem playing back 720p 24 trailers at 6 MB.
Thanks all.

First a correction. I am using the latest version of FCP – 5.
Regarding the encoding, I have tried going from native HDV MPEG-2 to H.264 at 720P from 10 to 4 MB at 24, 30 and 29.97. The Mac seems to play everything back very well, but most PCs (the latest IBM T 40 – 43 series laptops) a couple of Dell desk tops (2.6 GHZ with 64 and 128 MB graphic cards) and a 3.2 GHz Shuttle PC with a 128 MB graphic card (that we routinely use to decode four MPEG-4, 4CIF images simultaneously and display on a 42” ED Plasma) choke/stutter to varying degrees with processor utilization hitting 100%.
So, the real issue here is what is the difference between a 720p trailer that I can download from Apple and what I can output using Compressor 2 at a similar data rate – other than the frame rate?
And why does the Compressor output stutter on most PCs?

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First a correction. I am using the latest version of FCP – 5.
Regarding the encoding, I have tried going from native HDV MPEG-2 to H.264 at 720P from 10 to 4 MB at 24, 30 and 29.97. The Mac seems to play everything back very well, but most PCs (the latest IBM T 40 – 43 series laptops) a couple of Dell desk tops (2.6 GHZ with 64 and 128 MB graphic cards) and a 3.2 GHz Shuttle PC with a 128 MB graphic card (that we routinely use to decode four MPEG-4, 4CIF images simultaneously and display on a 42” ED Plasma) choke/stutter to varying degrees with processor utilization hitting 100%.
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And why does the Compressor output stutter on most PCs?

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720P 30 H.264 videos stutter when played back on Windows

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