Color Footage Of Berlin 1945

Vintage Everyday posted this short film featuring color footage of Berlin in 1945.  The giant poster of Stalin and the Russian language street signs suggest at least some of this footage came from the Russian-controlled sector of the city.  The video does have sound, but I wonder if it was added later, because despite hearing the background noises of trams, cars, bicycles, etc; you never hear anyone speaking, despite the large number of people in many shots.  This could be because the subjects were wary of talking while being filmed, but I would have expected to hear human speech in the background noise.