Quicktime Update No Longer Plays Any of My MP4 or M4V Video Files!?

Hi there everyone. I am absolutely desperate to find a solution to my problem now, so I was hoping someone on here might be able to help me out. I have a G4 that I use as a media center via frontrow to play my huge collection of MP4 and M4V video files that are local and streamed from the library on my main intel mac. This has been working fine for some time and I haven't had any problems playing files.
However, when iTunes 9 came out, I ran software update and updated iTunes and Quicktime to 7.6.4, as well as updating the OS to 10.5.8. As soon as I did this, all the MP4 and M4V files that had worked fine up until that point stopped being playable by frontrow/itunes/quicktime. A lot of these are movies that I bought from the iTunes store, and it will not even play those now. It is definitely not a video format problem. When I try to play them in quicktime, I get the error "file is not a video file". This applies to all old files, plus new ones I have attempted to add. Also, frontrow WILL play video files streamed from my main computer, but not local ones (same files). I did the exact same updates on my main mac, and all the files will play perfectly fine on that machine, it is only this one that won't play.
I have tried everything I can think of, I have reinstalled both apps several times. I have also checked the System/Library/Quicktime components and they are all intact, exactly the same as on my other machine. Now it looks as though my only option is to start again from scratch and reinstall the operating system - a time consuming option as I do not back up this secondary machine..
Does anyone have any suggestions of what I can do to fix the Quicktime installation? Any help would be much appreciated.
Thank you

Ok well if you want to go about it down and dirty you can try this. Take a file that does copy over correctly, for my purposes I had a Rocky and Bullwinkle episode that if I changed the file extension to .m4v it would add correctly through iTunes. From Terminal search /Volumes/youripodname/iPod_Control/Music/ for any file with the m4v extension and take note of them. Now add the "supported" file through iTunes then after it finishes do another search from Terminal and see which file with an m4v extension wasn't there before. Now from Terminal copy the "unsupported" file over to the same location with the same name. Here's what mine looked like cp /Volumes/harddrivename/Video/MUTEMATH.mp4 /Volumes/youripodname/iPod_Control/Music/F12/SJXB.m4v Now in iTunes change the Info for that file with the "Get Info" menu and your set. Mine now plays a video file that it wouldn't let me add through iTunes after the 9.0 update.
I'm sure there's a better way and when I figure out a quick script to do this by directly modifying the itunes database I'll try and repost a solution.
Message was edited by: Eli Barb

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Quicktime Update No Longer Plays Any of My MP4 or M4V Video Files!?

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