Some video files only display a blank black screen but plays audio

I am having a problem playing some of my videos in iTunes. After an update, some of my video files play and others do not. They are all in mpeg-4 video format so I don't know that is the difference except the videos that are not playing are larger files and different sizes than the ones playing. The shorter videos play fine and are 480x320 H.264 Codec but the larger files are 640x352, MPEG-4 Codec. Any ideas? My quicktime is up to date and I'm using iTunes 9.1 (79). Before updates I was able to view the videos without a problem and I cannot remember exactly which update caused the problem but I always update...so it is probably the last update.
I tried playing the video files in quicktime but now it says that quicktime maybe needs another component to play this video. It is strange because before updating I could watch the videos without a problem. Any ideas as to what has happened?

For the Quicktime issue try:
[Perian codecs for Quicktime|http://www.perian.org] - plugins to add functionality to Quicktime for playing additional audio and video formats
[Quicktime audio problems, Perian, VLC|http://discussions.apple.com/message.jspa?messageID=9013669] - read note about uninstalling prior DIVX support before installing Perian.
I'm not sure if this works with iTunes. I don't use itunes to watch video, I use [VLC media player|http://www.videolan.org/vlc> - general media player that plays just about anything.

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