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Originally Posted by patrick
sound is pretty important... i am pretty sure in most movies when they are shooting in noisy places (outside say), they would actually record the dialogue again with the actors and edit the new audio in (what do you say vidman?) and so they can add a certain amount of wind noise and stuff but not too much...
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Everything that is possible is done to make a quiet set (with a crew who is good) so that dialogue can be isolated for a good recording. For example if there is a shot with dialogue and you can't see below the actors knees, the floor would be covered with something soft, so you don't hear the actor's footsteps. The footsteps are added in later in post production by the foley artist.
While on location "presence" is also recorded, which is just the sound of the location. All of the actors and crew stand still for 60 seconds and the location sound recordist captures the sonic signature of each location of the movie. Presence is used later in post to, for example, help cover up sounds of airplanes flying overhead when there is no dialogue. A dialogue editor chooses all of the best bit spoken dialogue (whether it be sylables, words, or whole lines of dialogue) and mixes together a clean, seamless dialogue track.
If there is too much noise on a set to begin with that can't be taken away (such as rain or wind) then the dialogue is rerecorded later in post in a studio in what's called an ADR session. The actor listens to the recording of themselves during the shot and after listening to it many times they speak in sync with it. Care is taken to make the studio recording sound like the location recording (obviously without the noisy stuff).
