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
As people have said, the recordings are multi-track so you can isolate ambient from music from effects from dialog.
If you don’t have multi-track, you can often isolate the vocal track out by being clever. There are tools that work via essentially using noise cancellation to remove that band. You see it used here and there. Kind of like SAP where you can still hear a bit of the original in the background.
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