[MEncoder-users] length of dvd title

[Tomáš Bažant]

Hi

my question: how do I get the length (in frames or sec or whatever) of 
DVD title using mplayer?
if I try to read the output of for instance 'mplayer -dvd-device 
/some/dir dvd://1 -v -framse 0' i cannot find this info

thanks