MPlayer Startup Volume and Postion

I like to set the volume of mplayer to 28% of the volume instead of the 100% which is too large for me. And I also want mplayer to put to video window on the left top of the screen.

This is the method:

Add these lines to the ~/.mplayer/config file:

For setting the startup default volume:

volume=28

For setting the startup position to (0,0) (top left):

geometry=0:0