The following command tells the available commands for keyboard input.
switch_ratio
mplayer -input cmdlist
The keyboard shortcuts to mplayer are stored in two locations - /etc/mplayer/input.conf and ~/.mplayer
I prefer editing the /etc/mplayer/input.conf.
Assign shortcuts to aspect aspect ratio switching as follows
e.g.
a switch_ratio 1.3333 # 4:3
s switch_ratio 0 # switches back to original aspect ratio
b switch_ratio 1.7777 # 16:9 ratio
put his at the end of /etc/mplayer/input.conf.
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