Most MP4s play sound but no video after upgrade to 10.5

I just upgraded to 10.5.6 from 10.3.9, and now most -- but not all -- of my MP4s only play sound and don't show video (using Quicktime). I haven't been able to find what the files that do play properly have in common. Any ideas?
(Incidentally, I can open them in VLC, but I'd prefer to use Quicktime -- not to mention simply figure out the reason for the issue.)
Thanks --
Christine

Make sure you are using the latest version of Adobe Flash Player, Perian, Flip4Mac & VLC.
Disconnect all peripherals from your computer. Boot from your install disc & run _*Repair Disk*_ from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select *Disk Utility.*
Select the disk or volume in the list of disks and volumes, and then click *First Aid.*
Click _*Repair Disk.*_
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751
For the Final Pro issues, try their forums - http://discussions.apple.com/forum.jspa?forumID=939

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HT204291 Using Azul media player app on my ipad Apple tv will only display sound but not video from movies. Any ideas on a fix. I set mirroring to on but it still does not display video. It will display photos and video recorded from my iphone.

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Most MP4s play sound but no video after upgrade to 10.5

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