mplayer

# Always use X11 display
# This is helpful if you are logging in remotely through a shell, but watching it on a screen
display=:0
 
# This will also use "mplayer.conf" in current working directory
use-filedir-conf=1
 
# Cache 25 MB of the file before playing
# This is helpful on older hardware or ones that just need a second to start up
# Could try cache-min x% instead
cache=24576
 
# Always fullscreen
fs=1
 
# Use Dolby Digital / DTS passthrough to audio receiver
# Make sure to unmute "IEC598 1" in alsamixer
ao=alsa:device=hdmi
ac=hwac3,hwdts,

Force pan & scan

[panscan]
panscan=1
aspect=4:3

Use SPDIF hardware for output

[spdif]
ao=alsa:device=spdif
ac=hwac3,hwdts,

Specific entries for extensions

[extension.mkv]
demuxer=lavf

[extension.mpg]
demuxer=lavf

# .mov files can be HD trailers
[extension.mov]
vo=vdpau,xv

# .mp4 files can be HD trailers
[extension.mp4]
vo=vdpau,xv

# You can assume this is BD content
[extension.m2ts]
vo=vdpau,xv

It used to be that MPlayer would need these passed specifically

[vo.vdpau]
vo=vdpau
vc=ffmpeg12vdpau,ffwmv3vdpau,ffvc1vdpau,ffh264vdpau,ffodivxvdpau,