Stuttering/Choppy Playback of smallish .mov files

Hi all... I have been running QTPro 7.0.3 and before that 7.0.2 and both had severe problems running Quicktime movies off my hard drive without skipping, and stuttering.
These are files that are no more than 500MB and I've got 2GB of Apple RAM in my computer. My processor is a 1.25ghz, but this still shouldn't be happening. Right?
Please help -- it's really annoying!
-andrew

Same here. I have 3 solutions that work for me:
Use QuickTime Player 6.5.2 app (works fine with QT7.0.3)
Use MPlayer / ffmpeg
Use VLC player
My problem is not related to the audio settings, as 44,100 Hz is the only sample rate available in Audio/MIDI setup. It would be nice to have the QTP 7.0.3 Player work, since that's the default which opens when you double-click a movie.

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So, setting aside the irregularities in the reporting of file size, is there anything I should be aware of now that I DID transcode a full days worth of files using DVCPRO50 as a DV file?
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Thank you so much for your reply.
Yes, I have CUDA installed. I see the artifacts in the source monitor as well as the timeline monitor. I have tried exporting in several formats and the artifacts appear randomly in all outputs. I can get a clean export of the same files and projects from my laptop - HP Zbook.
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Stuttering, choppy playback? What gives?

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If I wanted this kind of performance I would have stayed with a Mac Mini.
What the heck? Help please before pack up the G5 and take it back to the store.

Sorry for my frustration showing, but with my post dropping to the second page of the forum I didn't want it getting lost in the shuffle. < </div>
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The clips in the browser are not rendered. < </div>
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I'm still on the learning curve of FCP so I don't know if I'm able to edit a clip in the timeline or how. < </div>
You cannot expect this forum to be a substitute for the 2000 pages of manuals you received with the applications. FCP is really complicated and deep and it takes a few months to get up to speed. That's m-o-n-t-h-s. We were all new to this application at one time or another. You've got a lot to learn and there is no shortcut. Start with the tutorials. They're very well done.
Rendered clips play fine on the Canvas but are still choppy and studder in the Viewer< </div>
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My clips are on an external drive with about 97 GB available. < </div>
Good start, at lest we don't have to cover the basic capture scratch information.
bogiesan

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See this article for some troubleshooting steps that can help with video playback in iTunes or Quicktime:
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http://support.apple.com/kb/ts1718
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