5 channel sound conversion

[sergueiXXX]

I've downloaded a xvid movie.
I wanted to convert it to SVCD, but it comes out without sound.
How I can convert the sound to stereo, to create SVCD.
When I try to play it in VDUB it says "No audio decompressor could be found..."
In a file information window it says:
48000 Hz
5 channels

compression: Unknown(tag 2000)

[Baldrick]

it is ac3 audio

divx with ac3 to wav
https://www.videohelp.com/sefy/?id=wavextract2.html

[sergueiXXX]

Thanks Baldrick,
I already encoded AC3 couple of times, but here it says about 5 channels(not 2).
Anyway I am trying to encode it with HEADAC3 now (last time I used internal tmgenc encoder and as aresult now sound).
I hope that it will work now.