Actually, Lensman - it may have something to do with the way it's saved - I found this on google.
http://www.scala.com/discussions/mpe...help-1646.html on a forum - different problem but might be the reason for it :
Posted: Friday, 12/13/2002 -- by Vladimir Zecevic. Subject: Audio Demystified (Cinderella kind of explanation)
Long time a go, when multimedia has started on PC, not all of the machines ware capable of playing all video content. In order to allow to all people, watching great and widely available video content something has to be done. One could not allow that film which is 1 hour long last 2 hour on slow machine.
Then one day, someone proposed that if machine is not capable of drawing all video frames it should skip some of those frames (cheating? no that's flexibility). But if you drop some of the frames how you should know the duration of video clip?
Fortunately almost all machines ware capable of producing audio streams without a glitch. And decision was made; Audio will be "heart beat" for multimedia.
It was too complicated at that time to think about other possible "heart beats". After all that was the beginning of multimedia. Time ware tough and you ware unable to know when bad application will decide to take over whole PC. (Drivers ware good guys those days)
To be continued...
Copyright (c) 2002, Vladimir Zecevic, all rights reserved.
I am kidding of course, please do not be offended. However, "core components" of the story are OK. Your audio card is giving clock for video stream and it is probable that it does not do it properly.
If you have audio integrated on your motherboard (most likely), it is probable that it will do better job than your Creative card.
Regards,
Vladimir Zecevic
Ars Media