Mon ~/.mplayer/config :

# Write your default config options here!
vo=xv
ao=alsa
loop=0
fs=yes
ass=yes
ass-font-scale=2
font=Arial
utf8=yes
nortc=yes
nolirc=yes
nojoystick=yes
stop-xscreensaver=yes
#aspect: -aspect 4:3 or 16:9
#remove 18" from sub file: -subdelay 18
#modify subs framerate: -subfps 25 (or 23.976)
#toggle DVD subtitles : j