Video · SoundNO.074 / 166

Watch: When no one is talking, a low layer of city sound is always running underneath: traffic, wind, distant voices. The waveform isn't high, but it never drops to zero.A line-art demo that only illustrates the technique, not finished footage.

Video · Sound

Ambience Bed环境底噪

A continuous bed of room tone that makes you believe the place really exists.

Category: Sound
Group: Basics
Medium: Video
Library: 074 / 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

Establishing indoor and outdoor spaces, cutaways, filling the silence around dialogue.

Prompt template

continuous ambience bed identifiable as the space, distant traffic, low hum, or birds, mixed low and steady, never masking dialogue.

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.

Continuous ambience: distant traffic, the low hum of air-conditioning units, an occasional bird, low and steady. A city rooftop at four in the morning: a man leans on the railing looking at the sky that hasn't brightened yet, steam rising from the coffee in his hand, and he doesn't say a word. 6 seconds, ambience only, no dialogue, no music, the bed must not cut out.

Common pitfalls

Ambience too loud, like a recording fault.
Ambience that doesn't match the location (waves indoors).

Parameter tips

Keep the level 15 to 20 dB below the dialogue.