cable from s-video connector to RCA plug

You may connect pin 4 to ground, pin 3 to rca center pin, extra 2 wires (ground and svideo aren't used), or use following scheme with capacitor:  

Y-ground------------------+
                          +---------- RCA/composite ground
C-ground------------------+

Y-------------------------+
                          +--------- RCA/composite video
C------------||-----------+
            470pF

This circuit works in practice quite well even though the circuit operation is not ideal. This means that impedances and signal levels not matched exactly right, but near enough to work accetably. The picture quality you get from this circuit is good, but not as good as with best possible composite video output circuitry.

Pin S-Video Description Pin RCA Color Coding

1

Ground (Y)

Ground

BLACK

2

Ground (C)

Ground

YELLOW

3

Y - Intensity (Luminance)

Signal

RED

4

C - Color (Chrominance)

Signal through 470pF Ceramic Capacitor (capacitor is optional)

WHITE

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

2 pin RCA plug connector layout
2 pin RCA plug connector
According to 30 reports in our database (28 positive and 1 negative) this pinout should be correct.

Is this pinout
S-Video to Composite video adapter visual pinout:
S-Video to Composite video adapter diagram
click to enlarge
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