How can I Display a Progress Bar in mplayer?

Ok. I figured out that one can press o button to toggle OSD (On-Screen Display) and that shows video length/played length.

You can press P (that is, Shift+p) to temporarily display the progress bar and elapsed time/total time (it disappears after about 1 second).

You can also use command line switch -osdlevel <0-3>

or put it into ~/.mplayer/config:

[default]
osdlevel = 2