Some below-the-line film and television film crews operate in pre-production, production, or post-production stages of filmmaking. For example, the film editor may work solely in the post-production stage of filming but they might also work throughout the production, editing the film as it is shot and advising the director if and when additional shots or scenes are needed. The boom operator, on the other hand, is mostly on set during filming because they have to pick up the dialogue of the actors as well as ambient noise when the scene is being recorded.