Zigzag distortion in video

I just purchased a video from ITMS and I am getting zig-zag distortion while playing it in iTunes. I can't tell if there is a problem with the video itself or with the playback, although I haven't experienced this before.
It sort of comes and goes and I haven't been able to capture it with a screenshot. But basically what it is is a big horizontal zigzag in the middle of the screen. It seems to happen uniformly when the camera is moving from side to side, which makes me think it might be a problem with the video file itself, but I don't really know.
Any ideas? I suppose I can just report this.

Well, unfortunately those solutions didn't help. Actually, they just made it worse. With the "GDI only" option, the video was very jagged, got like 2 FPS, even though I have a Core 2 Duo processor and a fast graphics card. With just the 3D video acceleration turned off, I got basically the same thing as the zigzag except up and down the entire screen instead of just in the middle.
I thought it might be because I had NTFS compression turned on for my media files, but the same thing is happening even after I turned it off.
I hate this. iTunes/QuickTime is the only program I know that can't even manage to play a simple video file correctly. If Windows Media Player, Real Player, DivX Player, etc can do it, why is Apple having such a hard time with this? Yet thanks to the DRM, I can't try to play this in other players.
It's this sort of behavior that is the reason I will never buy a Mac. I like my iPod, but it seems when you get to software that Apple manages to fail at doing the most basic things that other companies have mastered a long time ago.
Between that and the DRM (which unlike the music files you can't subvert by burning it to disc and ripping it back again), I'm gonna stick to DVD's and stop buying TV shows from ITMS.

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What is a CODEC... a Primer http://forums.adobe.com/thread/546811?tstart=0
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Zigzag distortion in video

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