Cannot play MPEG-4 video... help please.

Hi. I'm running OSX 10.4.10, and QT 7.2, yet I cannot play mpeg-4 video files. I get an error message that reads "The movie could not be opened. The file is not a movie file."
.>; Last I read though, isn't mpeg-4 supported by the current versions of QT? Am I doing something wrong?

Microsoft didn't follow the industries standards and QuickTime has trouble with some of those files. Even though the extension may say .mp4 it could contain Microsoft codecs which would require third party software help.
http://flip4mac.com may be able to help.

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