Suppose you’re shooting a movie. The actors do their work, and you also record their voices while they’re acting. Additional audio stuff like music and sound effects is added later.
But now suppose you want to dub the movie in another language. You can’t just slap music and stuff onto the project, but you (somehow) need to remove the voices of the original actors and then slap those of the new voice actors onto the film. Except if you cut that out, you’d also have to cut out all environmental noise, etc. And if you do that, you’d basically have to recreate every single sound required.
So how exactly does this work? Are movies shot with and without sound simultaneously? Or is there some technological means to separate the sound from the image?
In: Technology
The visual and audio streams are recorded simultaneously, but on different channels. A lot of the “ambient” sounds you hear are also added later.
You can also record music in different channels and mix them afterwards (that’s what happens with those “virtual choirs”).
The clapper board is used to align everything to the same starting point for each scene.
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