Video "sensing" Switch

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i ordered arduino mega 2560 (i haven't recieved yet) looking create circuit sense when composite, s-video, or component active.

i using chip switch video lines http://www.fairchildsemi.com/ds/fm/fms6501.pdf

i have read bit on video signals , seems (and may wrong) output 1 volt max normally, unsure of how check line without degrading signal.

the chip using (fms6501) has gain can set 6db, 7db, 8db , 9db. has bias , clamp, honest not 100% of for.

so splitting input on both fms6501 , arduino, afraid of degradation should use sort of ic or component split signal?
or since there variable gain, can split , check if high, if so, use i2c set correct register switch video...
does split test line need diode or resistor?

my goal keep video @ best quality possible, , check if video coming through. video input experience chime in, awesome.
thanks.

edit:
also, here simple diagram idea:


i know says picaxe, place holder programmable ic, attempting arduino first.



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