Actors may audition in front of one person or in front of a group of people. They may read a part they have practiced or read unfamiliar work. Narrators read voice-overs for movie and television scenes. They read from the script and speak into the microphone as the film is being projected. They often time their words to fit the on-screen action.
Extras perform in non-speaking roles.
They stand, walk, or sit in scenes as background for the stars' activities. Some extras perform special skills, such as dancing or riding. When in the background, extras often pretend to talk to other extras. Directors tell the actors and crew how to put the show together. They may select the cast members and conduct rehearsals.