drngr said:

Trying to do the same trick with an LD would be like averaging YCS-100 capture 1 with VP-100 capture 1; they won't cancel out.

As long as there's at least one analog->digital->analog conversion in the chain, then the phase-inversion trick is possible.

poita has tested this with many LD captures and has verified it to work.

The key thing to realize is that the video-DAC in the device determines the phase; not the source.

Extron YCS-100: composite=>([A->D]->[digital processing]->[D->A])=>s-video