trying to feed video into a 3.55 mm port on car dvd
I had this idea that if the one screen receives a video signal from the other player than I could bypass the DVD sending the signal and send a video signal from another device (my iphone 4) using the same method. I bought a Iphone 4 to rca audio and video cable to run the video feed out of the phone. THEN in theory I thought that an RCA to 3.55 male converter would allow me to run the video line out of the iphone into the DVD players screen. I would have to sacrfice one audio line (left or right, didn't matter) to plug the video into it BUT I thought in theory this wouldn't matter as audio/ video RCA seems to send video feed just fine.
NOW, I have it all in place but it doesn't work. Any ideas how I can make this 3.55 female line in on the DVD screen get a video signal from an iphone?
Thanks for any advice here.