No sound in vlc media player - FC 17 64

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http://forums.fedoraforum.org – I don't get any sound when I play a video DVD with vlc media player. This is on a FC 17 64 bit machine, Xfce spin. I have sound when I play Youtube videos in Firefox. I have sound when I play sound files from xmms. (Don't know what Mplayer would do. I find it's interface too mysterious.) Anyone know what problem would be peculiar to vlc ? (HowTos)