Definition
Lip sync (AI video)
AI-generated video where the character's mouth movements match generated audio. Native in Google Veo 3.1.
Lip sync in AI video means the character's mouth movements correspond to the audio in the clip. Veo 3.1 generates lip-synced dialogue natively — you describe what the character should say, and the model produces both the audio and the matching mouth movement. Other models can produce silent video that's then lip-synced to separate audio in post (via tools like Hedra or D-ID), but Veo's native lip sync is significantly more convenient.
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