No picture but audio?

Hi all,
I have downloaded a video in mp4 format which I get each week. When playing the video I'm getting audio play back but no picture! I'm running os x 10.6.3 with latest version of ituens. Have tried re-downloading the file but no joy my friend has tried downloading the file & it plays ok so I'm guessing it's not a file issue.
Any help would be awesome!

I recently discovered this very annoying issue after buying a new computer that came with 7.6.6. To my dismay a number of .mp4 clips of mine don't playback video in QT7 so I can't edit them any more.
What worked for me was to download the 7.6.4 version of Quicktime for Leopard here:
http://community.avid.com/forums/t/79244.aspx
Right-click the package, open package contents. Look for archive.pax.gz and copy it out to the desktop and double-click. It will unarchive a bunch of folders. You need the H264 component from the system/library folder and you need the Quicktime 7.6.4 application and if you want pro features, the system/library/preferencepanes file.
Right-click the broken 7.6.6 player and compress it then delete it - it crashes trying to use the working H264 component. In case Apple get round to fixing it, you can just unzip it.
Drop the 7.6.4 Quicktime app in your utilities folder or if you prefer, in the applications folder where it deserves to be.
Then drop the H264 component into /Library/Quicktime. Don't put it in your /System/Library/Quicktime. The /Library folder will override the system one and should you need to revert back to the broken H264 component, you just remove the one from /Library. You may need the mpeg4 component too.
Drop the prefpane into /Library/PreferencePanes to let you register QTPro.
Now my .mp4s playback fine with video and audio. Honestly, it's bad enough that Apple neutered QT Pro and tried moving people to QTX but to break such an important aspect of the playback on shipped machines is very poor.
Others have noted the issue as far back as 5 months ago and no fix from Apple:
http://discussions.apple.com/thread.jspa?threadID=2383580&start=0&tstart=0
It seems they regard Quicktime Pro as a legacy app and I wouldn't mind it if they added the same features in QTX but they haven't. We just have to hope they don't drop the app altogether like they did with a certain other pro application they nuked in favour of a less functional app.

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