Lip Sync
Matching a character's mouth movements to spoken audio so they appear to actually say the words. AI lip-sync models analyze speech phonemes and animate the mouth (and increasingly the whole face) to match. Combined with text-to-speech or voice cloning, it powers talking avatars, dubbed videos, and dialogue scenes — and models like Veo 3.1 and Sora 2 generate speech with matching lip movement natively. Quality checkpoints: watch for rubbery mouths and timing drift on long sentences. Keep dialogue lines short per shot for the cleanest sync.