What Is S-Video?
S-video technology transmits standard-definition video with 480 pixels or 576 pixels resolution. S-video cables have a variety of uses, including connecting computers, TVs, DVD players, video cameras, and VCRs. S-video is an improvement over composite video, which carries all the video data (including brightness and color information) in one signal over one wire. S-video carries brightness and color information as two separate signals over two wires. Because of this separation, video transferred by S-video is of higher quality than composite video.
S-Video Ports
S-video ports are round with multiple holes and a slightly flat bottom. The ports can have four, seven, or nine pins. Like composite video (the yellow wire in a three-plug setup), the S-video cable only carries the video signal, so composite audio cables (the red and white wires) are still required.
How S-Video Works
The S-video cable transmits video through two synchronized signal-and-ground pairs, named Y and C:
Y is the luma signal, which carries the luminance or the black-and-white elements of the video. It also includes horizontal and vertical synchronization pulses.C is the chroma signal, which carries the chrominance, the color portion of the picture. This signal includes both the saturation and hue elements of the video.
If both your output device (computer, DVD player, or game console) and your input device (television) have an S-video port, all you need is an S-video cable with the correct number of holes at each end.
S-Video vs HDMI
Newer video standards like HDMI transmit digital video signals in code. The main benefit of digital video is that the signal doesn’t degrade from source to destination. It’s also capable of transmitting higher video resolutions. If you’re using a device that requires an S-video cable, consider upgrading your electronics to models that can send and receive digital video. You’ll enhance your video and take full advantage of high-definition technology built into televisions and computer monitors.
How to Fix S-Video Not Finding a Signal
Both audiovisual devices must have S-video ports or jacks to connect using S-video. If you think you’ve connected everything correctly, yet your TV still can’t find the S-video signal, try the following troubleshooting steps: Correction 11/29/2022: Updated article with the correct reference for S-video.
