Taking video screencaps from dvd

Maybe my request wasn’t enough clear, that’s why I haven’t answer yet… So I do it again in other words if I can.

I have a dvd player on my computer.OK. I watch one dvd on my computer. OK. Now I want to capture some videos from this dvd on my computer.

Is there a way to do this ? And with what ?

Thanks in advance,

Your help would be very usefull ! :wink: