ELI5, movies were made with photos that played very quickly, but how was sound added to that when it did?
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A video projector has a certain speed to show images at so that they appear to be in real time.
A record player has a certain speed to turn in order to sound like it’s in real time.
Make a machine for each where the speed is the same, or alternatively take two normal machines and connect them with gears to make the speeds match.
Then start the two at the same time, and they’ll keep in sync.
They can even both be on the same reel of film to make it easy.
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