DVD no sound

I had no problem with this in 8.1 or the XP side of the computer. So I would think hardware is not an issue. I can run the DVD titles in Xine, Kmplayer and they display fine, I just get no sound. All my KDe desktop sounds work, and I can play audio files from the dvd device. Can anyone suggest what might be the problem? messages suggest unsupported audio codec Thanks......... John