[MPlayer-users] total playing time slave mode

Hello, I was wondering if I can in any way get the total playing time of a movie when mplayer is started in slave mode. I want to use it that way so I can make a seek bar in my program. But of course I need the total playing time. Anyone has a suggestion how to do this? I really can't find anything in the help docs :-s I hope this is possible or otherwise slave mode would be less interesting for external players I guess. thanx, Tom, ps I'm not subscribed to the mailing list so please include me in cc, thx!