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Audio-to-video synchronization

Audio-to-video synchronization (AV synchronization, also known as lip sync, or by the lack of it: lip-sync error, lip flap) refers to the relative timing of audio (sound) and video (image) parts during creation, post-production (mixing), transmission, reception and play-back processing. AV synchronization is relevant in television, videoconferencing, or…

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Overview

Sources of error

Effect of no explicit AV-sync timing

Viewer experience of incorrectly synchronized AV-sync

Recommendations

SMPTE ST2064

Timestamps

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Audio-to-video synchronization

Nodes57
Edges56
Triples9
Avg. degree1.96
Density0.035088
Components1

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Important terminology

video audio television error errors synchronization lip-sync av-sync may sync delay processing digital industry signal sound timing systems lip also

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
ITU-R BT.1359-1instance ofstandards0.80text
and other references below.Digital or analog audio video streams or video files usually contain some sort of synchronization mechanisminstance ofstandards0.80text
either in the form of interleaved videoinstance ofstandards0.80text
audio data or by explicit relative timestamping of datainstance ofstandards0.80text
LCDinstance oftelevision broadcasting and pixelated television displays0.80text
DLPinstance oftelevision broadcasting and pixelated television displays0.80text
plasma displaysinstance oftelevision broadcasting and pixelated television displays0.80text
one delivered by the Network Time Protocol or Precision Time Protocolinstance ofA real-time clock0.80text
described in the Session Description Protocol associated with the media may be used to synchronize mediainstance ofA real-time clock0.80text

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