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Iyellkhan t1_iu676ry wrote

Reply to comment by FredVIII-DFH 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

this was also an old technique with 16mm documentaries and, to a lesser extent, 8mm. There was briefly a period where you could get 16mm and 8mm film with magnetic sound strips that could survive the chemical bath that could hold sync, but that died out when home video took over.

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