Demux VBR MP3

[yup]

Hi folk!
How demux from AVI (DiVx and VBR MP3) VBR MP3. I try VirtualDub and VirtualDubMod, both change time duration for audio.
With kind regards yup.

[yup]

To all thank You for reply :D :D :D
I searching on forum and find it. I use NanDub RC2 and all work. I get VBR MP3 file with right time length.
yup.