Video without sound; sound without video - in Debian, KDE with SB Live
 

Distro: Knoppix 3.4 HD install.

I have my soundcard working perfectly with every audio program I use (xmms, kaffeine, xine, etc). Also, I have video working fine in every video program i [wish to] use (particularly MPlayer, but also kaffeine, xine, xmms).

Problem is, when I open a video in any of these apps I get absolutely no sound. If I then open an mp3, sound is fine again. This is the case with every codec I've tried (avi, real, mpeg).

Anyone had a similar problem? Is there something I'm doing wrong, maybe a module I'm missing or something?