[MPlayer-users] newbie question: jpg from a video

[eqmorales at ono.com]

Hi,

I've already read how to grab a cap from a movie with the command:

mplayer -frames 1 -ss 30 -vo jpeg -nosound video.wmv

or better -frames 5 to be able to choose the best cap for that time (30sec), but my question is: what should I do to grab a frame every 30 secs or every minute along the movie?

Thanks
Ezequiel