🚀 go-pugleaf

You could also try looking at Motorola's MC1378, a complete video
overlay synchronizer. I have put together the evaluation board, as
shown in the application notes, and found it to work quite well.
Some of the passive components in the circuit may be hard to find
(colour burst bandpass transformer, 200nS delay line). Even the chip
itself may be hard to get. (I got engineering samples from Motorola)
It does, however, provide genlock, RGB input, 36Mhz clock (10x colour
frequency), NTSC or PAL composite video input and overlay enable. Well
worth investigating!

/* these are, of course, only my own humble opinions */

	...!utzoo!dciem!king			sjk.