i've same problem, mplayer runs correctly if i start gui or mplayer from a root account. The problem ocurs when i run it from a non-root user, mplayer runs perfectly from shell, however if i run it from mplayer gui, it starts correctly but crashes when i want to start film.
How i said i think the problem is on permisions, i've change some /dev/ permisions but, it doesnt work.
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