> when distributing one video signal to more then one amplifier
> using hi-freq Operational Amplifier, do I need to distribute as
> well the inputs for all opamps or just connect them all together?

I think normally for video distribution you need to terminate
the video source with 50R or 75R then split it to the op amps,
which themselves will have 50R or 75R loads. Some circuits
I've seen have 27R as a series resistance before the initial
termination resistor

> same question for audio amplifiers...

That can be done by fanning out the signal through resistors,
eg 10k or so depending on the buffer/splitter gain. If you want
volume control for each path then you can add a pot after
each signal's buffer/splitter amp

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