Video stalls but audio plays on

Quicktime Player Pro 7.1.3. When ever I try to view a .mov, or mpeg, the viewer freezes on the first image, but the audio track continues to play. The movies play fine in VLC, and even on other computers using QTP and Safari. Funny thing, is that in Safari, the movies do not play, yet they play fine on other computers, using Safari (1.3.2). The videos play fine on my computer, though only in Firefox. They play fine in iTunes, also.
So, why is this happening? Quicktime app not playing movies, now Safari not playing movies from websites (movies I have made)? There has to be a connection.
I have set up another user, and the problem still exists. I have tried reinstalling Quicktime, but problem still exists.
Snowball iMac G4 Mac OS X (10.3.9)

If Safari is the only browser you are having problems with dealing with QT see if the following is of any help:
To fix a QT related problem w/Safari, quit Safari & look in the /Library/Internet Plug-Ins folder (this is the Library folder at the root level of your HD, not the one inside your Users/user name folder).
Try removing the VLC Plugin.plugin (if you have it) & QT Plugin.plugin files from this folder, & then relaunch Safari. If the problem isn’t fixed, a different plug-in may be to blame. Keep removing files from this folder (start with any third-party plug-ins that are present) until the problem disappears.
Replace the plug-ins that don’t cause any problems.
MacAddict Magazine...12/06

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I have tried everthing to configure Quicktime to play
videos with looking like a set of flashcards. I have
upgraded to all the latest versions. I unchecked the
"Enable direct3d video acceleration" in the Control
Paned Quicktime Preferences and have set it to safe
mode (GDI only) per the FAQ. But still I get halting
video from video files on my harddrive (not from
internet) while the audio plays just fine. Can
anyone expain this and tell me how to correct it. My
PC system is more than adequate so I do not
understand why this occurs. Flash Player video plays
just fine and only Quicktime video is a problem.
PLEASE HELP! I've paid for the whole first season
of "Heroes" on iTunes and am unable to watch it!
PC Windows XP
2GHz 1024 GB with Radeon 9000 128 MB video
card/driver
I am getting really SICK and TIRED of forums where pleas for help are ignored and are never receive a reply. Just like the player, your support STINKS! I cannot believe my problem has not occurred to hundreds of quicktime subscribers and that no one has a clue to this flashcard-like halting video problem.

Video stalls but audio plays on

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