[MPlayer-users] using mplayer to determine the running length of a VOB-file

[Julian Mayer]

hello
does anyone know of a way to use mplayer (or another opensource tool) 
to determine the running length of a VOB file?
i tried dividing the bitrate by the filesize but the bitrate values 
mplayer reports for VOB-files are utopical...
(1531.2 kbyte/s alone for the video stream of Mission Impossible 
2...that would be 10 GB and not 4GB for the running time of 118 
minutes..)
any help would be appreciated
thanks, julian