Stuttering MPEG in quicktime

I've read the other posts on stuttering video files but none of them seem to address my specific situation. Quicktime works fine for me generally, it's just these several I've downloaded recently. I'm quite certain it's not just a corrupted file, but I'm trying to play mp4's that I downloaded recently and the video freezes every few seconds, like a streaming file would, rendering it unwatchable. The audio appears to be fine. These are encoded as H.264. Help?

Here are the spec for watching h.264:
QuickTime 7 System Requirements
QuickTime 7 for Mac OS X:
400 MHz Power PC G3 or faster Macintosh computer
At least 128MB of RAM
Mac OS X v10.3.9 or later
QuickTime 7 for Windows:
233 MHz Intel Pentium class or better processor
At least 128MB of RAM
Windows 2000 or XP
For 852x480 (480p) video at 24 frames per second:
QuickTime 7 for Mac OS X:
1.25 GHz PowerMac G4 or faster Macintosh computer
At least 128MB of RAM
64MB or greater video card
QuickTime 7 for Windows:
2.0 GHz Intel Pentium 4 or faster processor
At least 512MB of RAM
64MB or greater video card
Windows 2000 or XP
For 1280x720 (720p) video at 24-30 frames per second:
QuickTime 7 for Mac OS X:
1.8 GHz PowerMac G5 or faster Macintosh computer; 1.83 GHz Intel Core Duo or faster
At least 256MB of RAM
64 MB or greater video card
QuickTime 7 for Windows:
2.8 GHz Pentium 4 or faster processor
At least 512MB of RAM
64MB or greater video card
Windows 2000 or XP
For 1920x1080 (1080p) video at 24 frames per second:
QuickTime 7 for Mac OS X:
Dual 2.0 GHz PowerMac G5 or faster Macintosh computer; 2.0 GHz Intel Core Duo or faster
At least 512MB of RAM
128MB or greater video card
QuickTime 7 for Windows:
3.0 Ghz Intel Pentium D (dual-core) or faster processor
At least 1GB of RAM
64MB or greater video card
Windows 2000 or XP

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We have recently become aware of an audio compatibility issue revolving around Flip Video and the latest QuickTime 7.4.5 update running on the Mac OS X 10.4 Tiger operating system. Apple is aware of the issue and is investigating it with Flip Video.
This issue does not affect customers running the Mac OS X 10.5 Leopard operating system.
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We apologize for any inconvenience this may have caused. Please do not hesitate to contact us for further assistance.
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See also: http://aeroquartet.com/movierepair/quicktime-errors
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Always do a back-up of your movie before using Atom Inspector.
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Stuttering MPEG in quicktime

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