Audio to video synchronization
Audio to video synchronization (also known as Audio video sync, Audio/video sync, AV-sync, lip sync – or lack of it: lip sync error, lip-flap) refers to the relative timing of audio (sound) and video (image) portions during creation, post-production (mixing), transmission, reception and play-back processing. When sound and video have a timing related cause and effect, AV-sync can be an issue in: television, videoconferencing, film, etc… Digital or analog audio video stream or video file usually contains some sort of explicit AV-sync timing, either in the form of interlaced video and audio data or by explicit relative time-stamping of data. The processing of data must respect the relative data timing by e.g. stretching between or interpolation of received data. If the processing does not respect the AV-sync error, it will increase whenever data gets lost, because of transmission errors or because of missing or mis-timed processing.
Related Questions
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- Audio to video synchronization
