The clapperboard, an iconic image of golden age Hollywood, still can be useful in today's digital video filmmaking
The clapperboard originally had two main functions for the film production. The first thing it did was provide vital information about the scene at its very beginning. The clapperboard would have the scene name, the take number, and any other vital information on it that would help identify this particular video clip from all the others. The second function it had was to give an audio synchronization point for the editor. If the audio and the video were not matched up perfectly you could clap together the two-hinged pieces of the board, and then the editor could line up the clap sound with the actual motion. This was done at the very beginning of the scene so that it could be easily lined up before being cut apart in the classic linear editing process.
When using a clapperboard there is standard information that should be on it. It should always include the scene name and number, the precise take number, the director’s name, the day number, and the location. The rest of the information is up to you, and many director’s include other crew on there as well as production notes for the scene. This would come in handy if you were doing several sets of takes each for a different approach to the same scene.