Why is it that the countdown at the beginning of old movies never reaches 1 and the movie instead starts on 3 ?

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Why is it that the countdown at the beginning of old movies never reaches 1 and the movie instead starts on 3 ?

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The leader marks where the film starts, but to avoid a jump they put up the title frame for the last 2 seconds. This is also when the sound starts to wind through the projector, so that it’s ready to start up when the movie starts.