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Welcome aboard!
About the video inputs, the issue is more complex when the set have DC coupling between stages (eg. from video demod. to sync separator). This needs to be accounted for, the bias for next IC's. And the amplitude of the signals. Even a mundane IC from the late 70's normally outputs more than 2Vpp of signal, and the modern video is only 1Vpp... some sync separators don't like that.
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So many projects, so little time...
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