Why is audio fine on export but video is white?

Hey all, I'm brand new to the forum but I need a little help.
I am doing some editing work from home for a website. The clips I am receiving are coming in mp4 compressed. The clips need to go into Avid Media Composer running on pc windowsXP in 720p project. The mp4s are around 800mb each full 1 hour shows compressed. When injested into Avid clips obviously look horrible. I was told to take into quicktime then export w/ DVCpro/NTSC codec which is the native codec to the pre-compressed clips. When I used the settings given I get fine audio but video is all WHITE. Export is fine w/ any other settings but DVCpro. I was told to try perian codecs download but I was having trouble finding a PC version.
Any thoughts, ideas? Any help would be very appreciated!

Hello,
I am having the same problem. Yesterday I could hear only audio without video picture but today, I can not watch videos even on apple page. It offers to open video with divix. I tried to unnistall quick time player by moving it to the trash, I know now that was bad idea. After that, I uploaded quick time player 7 but nothing happens. I appreciate any help.
Thanks

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