S-Video carries standard definition video (typically at 480i or 576i resolution), but does not carry audio on the same cable.
4-pin connector:
Pin 1 GND Ground (Y)
Pin 2 GND Ground (C)
Pin 3 Y Intensity (Luminance)
Pin 4 C Color (Chrominance)
The 4-pin mini-DIN connector (shown at right) is the most common of several S-Video connector types.
The luminance (Y; gray-scale) signal and modulated chrominance (C; color) information are carried on separate, synchronised signal and ground pairs.
7-pin connector:
1 - S-Video Luminance Ground
2 - S-Video Chrominance Ground
3 - S-Video Luminance Signal
4 - S-Video Chrominance Signal
5 - Composite Video Ground
6 - (No Connection)
7 - Composite Video Signal
Nonstandard 7-pin mini-DIN connectors (variant is called "7P") are used on laptops and video cards.
A 7-pin socket accepts a 4-pin plug, but not vice versa. However, the pins and the rectangular plastic key on some 4-pin cables may bend when inserted on a 7-pin receptacle. The S-Video signals are available on the four matching pins as before.
Of the other three pins, one carries a composite video CVBS (Chroma, Video, Blanking and Sync) signal for non-S-Video displays. Therefore, you can use a s-video to RCA adapter send the sigal to a non-S-Video display.
The 7-pin plug has a longer locating lug, making it difficult (but not impossible) to insert it in a 4-pin socket. Damage to the plug and socket is inevitable if the plug is forced into the socket.
9-pin Video In/Video Out:
1 - Ground (all grounds are connected together)
2 - Ground
3 - Pr (YPbPr) or Red (RGB)
4 - Y (YPbPr) or Green (RGB) [There is no provision for a separate Sync signal]
5 - Ground
6 - Ground
7 - Pb (YPbPr) or Blue (RGB)
8 - Ground
9 - Ground
There are two different types of the 9-pin DIN connector are used by video cards with Video In/Video Out (VIVO) capability.
The pin-out is used in ATI cards (see above, first one)
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