DVD out of sync

[genak]

I have some Xvid TV episodes with VBR MP3 audio which I have converted to DVD (ac3 audio), yet they are out of sync.

Here is what I did:

For the video...
- Resize with Avisynth
- Encode with TMPGEnc

For the audio...
- Extract to uncompressed WAV with Vdub MPEG-2
- Compress to AC3 with ffmpeg

I then muxed the two together during authoring (using TDA), yet the output is out of sync. Incidentally, it is only like this for some of the episodes I have encoded. Some have turned out OK.

Can anyone help?

[guns1inger]

If they are out by a constant amount through the length of the video, then you need to add or subtract a delay factor to align them. look in the tools section for ac3 delay corrector.

If they start in sync then drift slowly further and further out, then the framerate of the video has been changed, but the audio hasn't been altered to match. Use something like goldwave to adjust the length of the audio before encoding to AC3

[johns0]

I found ffmpeg puts the audio out of sync if its 44.1khz audio to start with.Using goldwave to convert the audio to 48khz before feeding it to ffmpeg cured that.

[genak]

1) The audio on all the files is 48khz
2) It is always the same amount out of sync

Is there any software which can tell me how much I need to shift the audio stream? Or do I just have to play around with figures?