Keyframe
In short: A keyframe is a complete reference frame in compressed video that subsequent frames are built upon, relevant to lip sync because the mouth region changes rapidly and needs frequent keyframes.
About Keyframe
In video compression, keyframes (I-frames) store complete frame data, while intermediate frames (P-frames and B-frames) only store differences from nearby frames. For lip sync content, keyframe frequency matters because the rapidly changing mouth region during speech creates significant frame-to-frame differences that benefit from more frequent keyframes.
Too few keyframes can cause compression artifacts specifically in the mouth area during rapid speech. When encoding lip sync output, production workflows often increase keyframe frequency compared to standard video to ensure that the generated mouth movements maintain visual quality through the compression process.
How Keyframe Connects to Lip Sync
Keyframe relates to several other concepts in the AI lip sync pipeline: Codec , and Frame Rate .
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