Ha I hear ya Alfeo.
It just so happened that I had the necessary RCA to USB cable, but because there was no prep day or proper correspondence between production and camera department we didn't have the proper adapter to make it work. We needed a standard usb to mini usb adapter. If we had that, we wouldn't have had to fly blind the whole time.
So this is a word to the wise, next time you go to radio shack or Frys or Best Buy, stock up on all the cables/adapters for audio, video and digital inputs/outputs you can. You'll never know what your next production will throw at you. And insist on a PREP DAY.