mplayer refuses to appear with dvd

hi all, another little problem... when I was trying to get digital signal from mplayer for my soundblaster spdif, somethin' got wrong, can you help me ? I also tried to reinstall it but nothin'...kaffeine works with dvd I thank you very very much for your precious work and patience ah, I wanna ask where is jack audio, please. I can't find in the italian repo.

bongeorge