AVS Forum Special Member
Join Date: Mar 2007
Location: Long Beach, California
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As Sam said, S-Video uses 4 pins. A 7-pin DIN is very common for multi-function video adapters, but different manufacturers implement it differently.
The first issue is that your cable-box is outputting composite video, but you are using a component video adapter. With composite, two of the three coaxes carry analog audio. With component, all three carry video. So I wouldn't expect that adapter to work. I'm surprised you got as far as you did with it.
As far as video resolution, you may be confusing composite video with component video. Although composite can be digitized at 640x480, it isn't capable of displaying that much clarity. 320x240 is more appropriate for digitizing composite video. Component video, on the otherhand, can go as high as 1920x1080, depending on the source.
The 7-pin DIN systems I have used only supported S/PDIF (digital) audio, but your Pinnacle must also support analog audio, or you wouldn't be hearing anything at all. So it should be just a matter of getting the correct composite adapter.