Hmm that's a bummer...

What I could recommend is a VGA to S-Video converter Box. The one I got from eBay is quite decent. Though the built-in splitter will weaken the signal, so don't use it...

I have one, but the capture device I use hates it. No matter whether I use Composite or S-Video, the video jitters from side to side non-stop, especially the top half of the screen. I also have color issues with my converter in S-Video as the picture has an excess amount of green in it. The only way the video works correctly on my capture device is if I run the S-Video output into my DVD recorder then run its S-Video output into my capture device. Doing this keeps the picture stable, but make the picture much blurrier and very dark.

The computer I want to use the STB Velocity 128 PCI ON only has a single stupid ATI 3D Rage IIC AGP graphics card built-in with only VGA output. I need a PCI graphics card with S-Video output on the same quality level as my ATI 3D Rage II+DVD which outputs REALLY good S-Video. I've actually been looking for another ATI 3D Rage II+DVD with TV out, but all those I find have only VGA output. I need the higher quality I can get out of the S-Video output built into graphics cards, but the card itself CANNOT cut off more than one pixel on either side of the picture. Two of my AGP graphics cards, the nVidia GeForce 2 MX and my ATI Radeon 7500 both cut off several pixels from the overall picture when using S-Video. The GeForce 2 MX cuts off several pixels to the right(and is very blurry and with a blue haze over everything) while the Radeon 7500 cuts off several pixels to the left. It's annoying, to say the least.

Hmm do you have another S-Video capture device to test?

The one I have is from Compro. It cost a little more than the cheap ones from eBay, but was the main product I found locally that had W7 64 bit drivers...

I do have another capture device, but that one tends to drop the video feed every now and then or lag so far behind the video practically stays stuck at a still image all while inducing a NASTY popping noise in the audio signal(sometimes, the noise happens even when the video feed is fine). It hasn't done this with the VGA to S-Video/Composite box, but the lower resolution makes the video blurrier and this capture device records at a lower framerate, so the video isn't as smooth. I'm all about quality, so I'd much rather use my new capture device as its S-Video quality is MILES ahead of the old capture device and it records at a higher resolution with a higher framerate. And a graphics card with built-in S-Video output as it's (for the most part) much sharper and more colorful than my VGA to S-Video/Composite box's S-Video output.

As for the STB Velocity 128, I wonder if the video encoder is damaged. The STB Velocity 128 uses an Analog Devices AD724JR RGB to Composite/S-Video encoder to produce Composite and S-Video. If the problem is not the encoder, what could have gone wrong instead?