problem with unknown audio codec

[skywalker9999]

i've been trying to convert a divx movie to svcd for some time now, but everytime i try to convert the audio, by using irtualdub, i get a message saying that the audio codec is unknown. i have both the ace codec pack & nimo codec pack installed. the video itself is encoded with divx 5.05. i've never had any problems converting divx to svcd in the past, until this one, and i've done others since then which have worked fine.
the audio actually plays fine when i'm watching with divx player 2.1, so it obviously recognises it, but perhaps virtualdub doesn't, so i guess what i'm asking is this - is there any other software available which will extract the audio?

[skywalker9999]

sorry, i just saw the sticky. can somebody move this string to the correct forum please?
thanks