note that your input sources must be genlocked to achieve this !
A videomixer such a Panasonic mx10 has a TBC build in.
read up here: Questions regarding using multiple Cadet III’s
(my reply there was based on the assumption that no TBC was used)
So, as a simple setup:
1x Cadet Sync generator
1x Cadet RGB encoder (modded for B&W- see here: topic )
2x Cadet Video input
2x Cadet Processor (for inverting)
1x Cadet Fader (for crossfading)
2x Cadet Hardkey (for keying each channel)
If you want to do wipes, a Cadet Ramps is handy.
and a Time base corrector or camera’s with Genlock