.mp4 videos stuttering

Hello all, I did some searching and found no definitive answer..
I am shooting HD video with a Sanyo Xacti VPC-CS1 in 1080p. When I am done shooting, I upload it to my desktop and try to play it from there. It opens up Quicktime and starts to play but it is all choppy. Is there anything I can do to fix this issue? I have a new iMac with 4Gbs of RAM, running latest version of OS X.
Any help or tips would be most appreciated. Newb, sorry.
Thanks.

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Video stuttering on playback

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Intel HD Graphics 3000 512MB
I've tried both Quicktime and VLC. When I playback HDTV.x264 mp4 videos I get periodic stuttering / hesitation. They do seem to occur most often when there is a moving, wide shot (although not every time), but they occur at other times as well. It makes watching a show/movie tough.
80+% CPU idle, Memory is in good shape, disk activity is low, and the monitor is connected via an Apple Thunderbird/HDMI cable.
Any suggestions as to what I can do to fix this? Is there a different media player that would work better? Or a setting somewhere?

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Hi..
Switch 101: Migrate your Windows files or system to your Mac

I made a duplicate copy of an imovie HD project and when I updated the titles on the copy, the video stuttered . I'm using Snow Leopard OSX. The length of the movie increased unexpedtedly too.

I made a duplicate of an imovie HD project so I could have two different versions. I tried making the copies both by using File> Duplicate and the Save As command in imovie.
When I changed the title on the copy, the video stuttered when I played it back. Also the overall length of the movie increased by about 6 seconds throwing off some sync even though the replacement title was exactly the same length in seconds and frames as the one I replaced.
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*24 December 2009*
*Dear Mac Users:*
Hello. Thanks to AppleMan1958 for answering my question about how to edit an iMovie project
on another computer.
Here is a question related to the process of transferring the iMovie '09 project file from my friend's
computer to an external drive so that I can edit that project in iMovie '09 on my MacBook Pro:
How do I know if my Smart Disk FireLite portable external drive is formatted to MAC OS X Extended (journaled)? How I do format this Smart Disk FireLite USBFLB80C to MAC OS X Extended (journaled)?
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Corey

.mp4 videos stuttering

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