S-Video to Composite video RCA

pinout

4 pin MINI-DIN male connector


Y-Ground >-----+

               +--- RCA Composite Ground

C-Ground >-----+



Y >------------+

               +--- RCA Composite Video

C >-----||-----+

      470pF Ceramic

Pin S-Video	Description	Pin RCA
1	Ground (Y)	Ground
2	Ground (C)	Ground
3	Y - Intensity (Luminance)	Signal
4	C - Color (Chrominance)	Signal through 470pF Ceramic Capacitor

Notes:
Larger capacitor values will also work, but cause picture to become "softer".

2 pin RCA jack connector

Source:www.pinouts.ru