The short answer is no. Video needs a 75ohm transmission line and termination to maximize lossless from point A to point B. Audio cables do not have a characteristic impedance and are high capacitance (read lossy) too. Look into twinax for video. Belden and others make very slinky video cables these days. Just remember, even though you've separated the Y & C channels, it's still video and requires the same bandwidth.

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