Techniques & Methods
Native Audio Generation (Video) in plain English.
Also known as: video with sound,synchronised audio,audio-video generation
The one-sentence version
A video model producing the soundtrack, from dialogue to ambient sound and effects, in the same pass as the picture, synchronised to what is on screen.
Until 2025, AI video was silent; sound was added afterwards with a separate tool and rarely matched the picture. Native audio generation trains the model to produce audio and video together, so footsteps land on steps, lip movement matches speech, and ambience fits the scene. Google's Veo 3 made it mainstream; by autumn 2026 it is table stakes, with Seedance 2.5 producing 30 seconds of synchronised audio and video, MiniMax H3 and LTX-2.5 generating native stereo, and Kling 4.0 shipping 4K with stereo sound. The quality varies: ambience and effects are generally convincing, music is serviceable, and dialogue is the hardest, with accents, timing, and voice consistency still imperfect. Creators who need a specific voice still generate speech separately with a voice model such as Eleven v4 and lip-sync it, and anyone publishing commercially should check the licence terms for generated music. The practical benefit is speed: a first cut with sound in one generation instead of three tools.