Video faster than audio

[lessthanbake]

For some reason my final mpeg that comes out of process of DVD-XVCD the video plays faster than the audio. Its not that the video is ahead, it runs faster and idk whats doing this. Any suggestions on how to fix this are appreciated. Thanks

[Jerry]

Hi,

I've got the same problem, anyone have any ideas?

Thanks, Jerry

[Ross]

Disclaimer: All of the facts may not be correct. These are only my thoughts on the subject, in fact, I may be showing my own ignorance. I invite any corrections and/or comments.

In discussing the sync issue with some of the top hacker in the mac community, qt mutator is not the correct way to fix the problem. At least for now, most of the tutorials include mutator.

Note: the length of the audio should be used as the baseline, and should never be changed. If the length of audio track is 60 mins (always use this as baseline), then the video was originally 60 min also. If the sync is off by 12 mins at the end, then [60-12=48 : 48/60=0.8 : 23.976/29.97=0.8] Another way to look at it is: if the original video was encoded at 23.976 fps it would be about 86313 frames [23.976 fps x 60 sec/min x 60 mins = 86313]. If you play those 86313 frames back at 29.97 fps it would only play for 48 minutes [86313 / 29.97 / 60 = 48]. Get the idea.

In general, there are four types of dvd. 1) made for video ntsc (29.97 fps), made for film (24.0 fps), converted film ntsc (23.976 fps), and pal video and converted film (25.0 fps). The trick is to pick the right one. Not much problem for video ntsc or native film, or even pal. Where it get tricky is the converted film to ntsc, which Hollywood uses allot. They take film (24.0), drop some frames to make space for the signals TV needs (23.976), then tell the dvd player to add frames to make it look like video (29.97). This process is call pulldown and there are settings in the encoders for this. But most decoders have trouble with it, because the info on the mpeg says it's 29.97.

There is more! If the producer includes animations or special effects, these could be at totally different frame rates, switching then switching back.

If there was a lead-in video clip that you did not rip or the
soundtrack starts before the video, the offset in mplex can be used. In this case QT Mutator offsets works great for mov.

At the present time, there is no decoder/encoder that gets it right all of the time, including apps for the PC. There are talented people working to solve the puzzle. But even the experts I have talked with only try a dvd title once or twice, then go buy it for $19.00 if they really want it.

This wasn't the answer you were hoping to get, but I hope it helps,
RNC