Never used arabic fonts myself, but to set a default sub font in mplayer, open "~/.mplayer/config" with your favorite editor and add a line like this:
Code:
font=path/to/your/font
Make sure it points to your actuall font and not just its map.
Mine looks like this:
Quote:
# Write your default config options here!
font=/usr/share/fonts/bitstream-vera/Vera.ttf
subfont-text-scale=3.2
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The "subfont-text-scale=" is to change the size (only works with true/freetype fonts).