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MPEG files playback with wrong time. Please help

   
   
 

Posted: Friday, 12/13/2002 -- by Saber. Subject: MPEG files playback with wrong time. Please help

When I playback some of my mpeg files they will say that they are for example 45sec long. However I know that they are longer because when they get to the end the video stops but the audio continues.
Also when I skip forward using the scroll bar i am able to see most of the movie but it only play for a total of 45secs. It is very weird.

I have tried to use several different plays but that all say the same time. I have tried to re-encode it using different encoders but still no luck.

How can I tell the computer that the mpeg files is long then what it is detecting it as.

Many Thanks
Travis

Posted: Friday, 12/13/2002 -- by John Schilling. Subject: Most likely your Audio Device Driver is defective

This is generally an indication of a bad audio driver installation.

Find the current Microsoft WHQL-Certified device driver for your Audio device and follow its instructions for proper upgrade proceedure.


Regards,

--John Schilling, Scala, Inc.

Posted: Friday, 12/13/2002 -- by Saber. Subject: Audio device seems fine

I am running a sound blaster live 5.1 and I have got the correct drivers for windows xp.

Why does it only do it with a couple of mpeg files.
My audio dosen't seem to have any other problems with anything else

What does the audio driver have to do with defining the length of a mpeg file? shouldn't that be establised by the file itself. I know it is longer then the player is recognising it to be.


Thanks for the help.

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

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