The fact that it has a RCA connector doesn't mean shit (well, the only thing that is for sure that it can't provide a balanced audio connection, but it's irrelevant here), if it's not a used with a coaxial cable. So you should use either a coaxial cable with RCA connectors, or an optic cable with TOSLINK connectors. Use any other cable and you risk sync problems and signal degradation. You can certainly try.
When you see a RCA connector on a video cable, it usually means it's made for consumer equipment (professional systems use BNC connectors).