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insomaniac117 t1_iu4gwgn wrote

Reply to comment by nightfly19 in TIL, in film, a clapperboard’s purpose is ensuring proper synchronization of audio and video in post-production. It provides a distinct “clap” along with a visual event for the editor to reference at the start of a scene. by PianoCharged

While this isn't done on set, in post production we frequently use sync markers at the beginning and end of the program to help verify that the picture and sound are in sync and don't drift after converting between formats and frame rates.

These are typically a 1 frame beep/tone with a corresponding visual marker placed 2 seconds before program (the edited show or movie) starts and 2 seconds after it ends.

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