A 2-pop is a small ‘blip’ sound (usually a 1kHz frequency) that lasts 1 frame, and placed 2 seconds before a film starts. It is used to help sync audio and video together.

In a professional audio/video post-production environment, every audio session or sound reel will have a 2-pop on it, and the film will also contain a visual reference that is meant to be synced to that blip.

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