MainConcept and VSO sync issues

[marcopolo1]

I have a DivX 25fps Mp3 video that I just cannot get to sync correctly. Normally I can split the audio and video and join them using DVD author. I've tried the automated process of Mainconcept and VSO with little success. Anyone have any ideas. I've tried other AVIs and they're fine.

Thanks,

Mark

[mats.hogberg]

What's your target format? Still PAL?
Is it CBR or VBR MP3?
How doesn't it sync correctly?

/Mats

[marcopolo1]

I'm outputting as PAL, VBR.

The audio is out of synce with the video.

Mark

[guns1inger]

NSS

Is it out by the same amount all the way through, or does it drift out over time ? Or, does it start out in sync, remain in sync for a while, then jump out of sync ?

[mats.hogberg]

The audio is out of synce with the video.

Yes, I thought that much, but it can be out in many ways!

/Mats

[marcopolo1]

It's out of sync all the way through, seems to be quite alot.

[mats.hogberg]

How much is "alot"? Like 1 s? 30 minutes?
In that case, the AVI might have been interleaved "with skew", the audio doesn't start at the same point where the video start. When it's demuxed, this info is lost, and when reencoded and put back together again, you get the sync out. The solution (for me at least) is to add (if the audio is ahead of video) some silence at the start of the audio (after demuxing and decoding audio to wav) to compensate.

/Mats