AVI (with 44.100 kHz audio) to DVD is always out-of-sync. Fix?

[Mildew]

I've got a series of AVIs, some which have 48.000 kHz MP3 for audio and others which have 44.100 kHz MP3. I'm converting them to DVD. The AVIs with 44.100 kHz audio are always out of sync (constant, not progressive) by roughly half a second. The AVIs with 48.000 kHz audio are always perfectly in sync when encoded to DVD.

1) Anyone know why the 44.100 kHz causes the resulting mpeg-2 to be out of sync?
2) Is there a way to fix it?

I tried using ffmpegX's audio sync offset feature but it didn't change a thing. I tried to delay the video by 500ms but there was no discernible difference. I don't think it's working or I'm doing it wrong (I entered "+500" in the sync box).

Let me add that the AVIs play just fine, with no audio sync issues.

[Case]

a/ Which preset did you use; DVD mpeg2enc or DVD ffmpeg?
b/ From your post it's not clear if you encode the audio to 48 kHz sampling frequency, which you should, as DVD does not support 44.1 kHz, and that could cause all kinds of playback problems, depending on the player.
c/ Did you use the audio sync offset in the Tools-Mux tab or in the Options tab (mpeg2enc only)? The first only works when muxing 'manually', the latter should do while encoding. And if the latter fails, you could try the former.

[Mildew]

a/ Which preset did you use; DVD mpeg2enc or DVD ffmpeg?
b/ From your post it's not clear if you encode the audio to 48 kHz sampling frequency, which you should, as DVD does not support 44.1 kHz, and that could cause all kinds of playback problems, depending on the player.
c/ Did you use the audio sync offset in the Tools-Mux tab or in the Options tab (mpeg2enc only)? The first only works when muxing 'manually', the latter should do while encoding. And if the latter fails, you could try the former.

I tried both presets. I also tried encoding just the audio to 48 kHz and then muxed it with the video. The audio sync offset doesn't seem to be working, either when muxing or during encoding. I tried delaying the audio by 500 ms and 1000 ms. There was no noticeable difference in either resulting mpeg.

BTW, If I want to delay the video by half a second, do I enter "+500ms" or "+500"? Major's help pages don't give an example of the proper syntax.

[Mildew]

Okay, I've done a bit more reading. Apparently, 44.1 kHz audio is the sample rate for CDs and 48 kHz audio is the sample rate for DVD. The 44.1 kHz audio needs to be resampled to 48 kHz when converting to DVD. Neither ffmpegX nor VisualHub can correctly resample the audio in order to keep it in sync with the video. Furthermore, Toast 7 properly resamples the audio and syncs it with the video.

So my question now is why does ffmpegX fail at this task? And is there a workaround? Yes, I can use Toast, but Toast's video compression is poor compared to ffmpegX's.

[Mildew]

Nearly 200 views and no one has an answer? C'mon, please, someone. Or at least direct me to an audio/visual forum where someone would know.