How do I change the default configuration of MPlayer movie player?

[Steven Vollom]

> You can change the aspect ratio in Kaffeine to by pressing F5, F6, F7,
> F8 or F9 or from the menu, Player > Video > Aspect ratio (don't know
> the exact english translation).

When the aspect ratio opened, none of the choices were active.  I could not 
set aspect.  Additionally there was no choice for 16:9 which is what I 
prefer.

Thanks Jonas,
Steven