Video · SoundNO.073 / 166

Watch: As the mouth opens and closes, the waveform below rises and falls in sync: whoever is speaking on screen is where the sound comes from. Sync sound brings the characters to life.A line-art demo that only illustrates the technique, not finished footage.

Video · Sound

Sync Sound同期声

Dialogue and action sounds come from the scene itself, not added later.

Category: Sound
Group: Basics
Medium: Video
Library: 073 / 166

Want to merge it with other techniques (shot size, lighting, style…) into one full prompt? Click “Add to combo”, then pick one from each of the other terms.

Prompt templates are written from how generation models usually behave and have not yet been verified one by one with real generations. “Common pitfalls” are judgment from experience, not official limits.

When to use it

Dialogue, documentary, scenes that need credibility.

Prompt template

location sync sound, dialogue and action sound matching the image, ambience consistent with the visible space, no music bed.

Sample prompt · generate a video directly

The technique comes first, followed by the scene, action, performance and duration. Paste it straight into a video model and swap in your own characters and plot.

Sync sound, the dialogue and action sounds in sync, the ambience matching the space, no music over it. At an old shoe repair stall, the cobbler taps a heel with his hammer while chatting with a customer: “These shoes must be ten years old?” The customer laughs: “Twelve.” The hammer, the dialogue and the street traffic all come from the scene. 5 seconds, lips and sound strictly aligned.

Common pitfalls

Lips out of sync with the sound.
Music laid over the whole scene and the sync sound disappears.

Parameter tips

Decide first whether you want music; leave dialogue scenes clear.