Are you sure it's input? Most of them are just output. You should see 2 SVid ports.
Anyway, you can make converters pretty easilly if it is input. Pick up a cheap svideo and RCA cable at some place like big lots and just tinker with different wire combinations. I can't reacall right off what works, but there is a certain combination that will give you video. You can also buy converters. I know MCM Electronics has one, but I can't recall the part number right off.