DVD captures

I am trying to capture short clips from a DVD onto my hard drive. I can assure you that I am not doing anything illegal with them; one of my hobbies is editing (non-profit) music videos from TV shows and movies, and since I can no longer get the footage from file-sharing programs, I have to switch to DVDs from my private library. My problem is this: How would I go about capturing scenes from a DVD onto my hard drive? Do I need a specific video editing program? I have three or four programs on my computer that I can use for viewing the DVDs, but none of them allow me to do any more than capture just one frame for a screen cap or just the sound.

I don't know if I've provided you with enough information to answer my question, so if you need more information, feel free to ask me. I'm not usually this computer illiterate. :)

Thank you very much in advance for any help you can provide!

Aarann