Many integrated circuits have undocumented features or abilities. This is one of them. The TLC555 output (pin 3) can sink a 100mA load to 1.28V. The open drain transistor reset (pin 7) can sink 100mA ...
I know, I know—discussing the subject of a relay-based sequence switch in the age of omnipresent microprocessors seems to be a waste of time. After all, relays have been in use for many years. Is it ...
Use an LM1881 sync stripper to trigger a 555 timer set up as a one shot, make the time period longer then one video line (~65uS), and use the output of the 555 to control the relay.
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