Some fun facts of the day..
Regarding the clapperboard, slate or marker that you see before scenes in production.
Its job is to provide vital information about the scene at its very beginning. The clapperboard has the scene name, the take number, and any other vital information on it that would help identify particular video clips from all others. It also gives an audio synchronization point for the editor in post production (since they come into editing, seperately). 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. As most see, this is done at the very beginning of the scene so that it can be easily lined up, before being cut apart in the editing process.
When a movie's sound and picture are out of synchronization, they call it a lip flap.
Black and white stripes? Diagonal lines of black and white strips are there in order to ensure a clear visual of the clap in almost any lighting condition.
All more simple than you may think!
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