Does a yellow flashing signal indicate that the red signal is about to come on?

In the video you are driving along a wide street in town; traffic lights above the roadway show a flashing amber signal. The flashing amber signal does not mean that the red signal is about to come on. The answer is: no.

The Regulation on road signs and signals states that a flashing amber signal warns of a danger or an obstruction to traffic and requires you to exercise particular caution. Only a steady amber signal shown after green in the normal cycle of the traffic lights announces red - it means no entry beyond the traffic lights (unless you cannot stop without harsh braking) and tells you that red is about to come on. So a flashing signal and a steady signal are fundamentally different: steady amber requires you to stop, flashing amber allows you to drive on, but carefully and according to the signs. A driver who brakes harshly at flashing amber, expecting red, risks being hit from behind; a driver who treats flashing amber as "their" green may fail to give way to vehicles on the intersecting road. The correct way: you slow down, check the signs and give way to whoever you must - here the traffic lights warn of a pedestrian crossing, so you watch for pedestrians. At night and when traffic lights fail, this is an everyday situation in town.

Legal basis: § 98 para. 6 and § 95 para. 1 point 2 of the Regulation on road signs and signals