If you do it yourself, make sure you use a VCR with S-Video output. The regular composite cables (red, white, yellow) combines the chroma (color) and luminance (brightness) into one signal. That means boundary with a high brightness contrast will bleed into the color (and vice versa) and you'll get marching ants. S-Video encodes these two signals separately and eliminates that particular problem. The biggest quality improvement I saw while encoding VHS and Hi-8 tapes myself came from switching to S-Video cables.
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