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With s-video the Y/C separation is done by the S-VCR not the capture card and sent separately so it doesn't cause interference with the luma information. Why would s-video not be recommended for VHS? My quick tests always looked much better using s-video but the Black Magic Intensity I was using doesn't have a great comb filter. I was capturing in uncompressed 10-bit 4:2:2. S-video is nice because you don't need a comb filter at all.
As I understand it, unless damaged, s-video is always better than composite.
"Analyze" is pretty vague.
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