quite a few..
My favorites (I use both) are Handbrake (free) and ******** Video Converter (not free). Try Handbrake first since it won't cost you anything. If you don't mind paying, ********'s Video Converter is awesome - fast and do-everything.
Note: the name of the video converter was blocked automatically - I didn't use the asterisks. I don't work for or profit from this comapny at all. It just happens to be a program I tried and then bought because it worked so well. If I'm not crossing line, the first four letters are xili and the last are soft.