[MPlayer-users] no ifo - can i convert?

[techorix]

Hi,
i have the idx and sub file for a movie and it seems it wasnt released 
without an ifo -  using an ifo  from another movie works kind of but the 
timing is totally off, i read at the manpage there is a way to convert .sub 
to mpsub. But it seems to fail here, i did: 
mplayer moviename.avi -sub moviename.sub -dumpmpsub -vo xv -framedrop  
am I supposed to let the whole movie play to get an output? Nonetheless 
nothing happens here but playing an unsubbed movie.
Maybe you have an idea?
Michael