No sound

[DXM31]

HELP!
I have no sound on playback
here is what VirtualDup says:
video stream:
Fram Size: 640x352,23.976 fps(41708 ps)
# of frames: 103593(1:12:00)
Decompressor: DivxMPEG-4 Low-motion
Number of key frames: 1131
Min/avg/max/total key frame size: 1107/10330/35055(11411k)
Min/avg/mas/total delta frame size: 112/4645/48411(464832k)
Audio stream:
sampling rate: 48000Hz
channels: 5(stereo)
sample precision: 0-bit
compression: Unknown(tag 2000)
Preload skew: 28000 samples(0.58s)
# of frames: 103583
Min/avg/max/total frame size: 28/2335/28000(236286k)

I see the compression says unknown but how do I find out what it should be?
I did a search but didn't find anthing
Thanks

[Batman]

You are in need of the AC3 audio codec, available in the TSUNAMI filter pack.

[DXM31]

thanks, I'll look for that