Given that the 2 photos are the RCA adapter with 4 wires each, and each ends has a yellow connector with 2 wires each.

There are only 2 wires at the yellow connectors of both the RCA cables. Obviously, inner ring is video signal and outer ring is ground.

Whereas, in the 1st photo, there are 4 wires at the GREEN connector.
One is the input video signal.
One is ground.
And, what are the 2 remaining wires used for???
And, what's inside the black box junction???

On the contrary, the 2nd photo, there's no Black box junction. 3 wires coming out.
And what about the 4th wire?

I really need englighten on these 4 wires and it's really confusing me alot.
Please help.

 

You only gave us half the story. Half an answer would not be much use. The device adapts an RCA video connector to what?

 

Please watch this video

 

Please watch this video

That video is not available. A quick description is all we need.