I have the urge to record my games for videos and have an aux [R][Y][W] video capture device. I was wondering if theres any way to get rf coax to have an output of red, white, yellow aux.

I can always find boxes that turn aux into coax for older tvs. I need the inverted effect.

Any thoughts? + I would like to keep cost down as it is a hobby of a hobby on top of a hobby.