Ebay ,Parts Express .
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I looked on Ebay and found used Sony Handycam CCD-TRV98s for sale used.
I would guess that it uses a three conductor 3.5mm jack not a four conductor. I would also guess that a standard stereo jack could be tested swapping them into the RCA for video to determine which chanel is video.
Three conductors jacks share a common ground.
If you only have two jacks coming out of mini jack just try flipping the connection and see if you get a picture and sound. If you have three coming out there are only 9 combinations shouldn't take long to figure out.
BTW the color of the connectors has nothing to do with the signal. If there are two jacks coming out of it that means there are only two signals to go into it.