Generated clips are usually delivered silent or with weak accompanying audio, and what gets added afterward determines whether a sequence holds together. Sound compensates for continuity the image lacks.
Room tone establishes that shots share a space
Every location has a continuous background sound: air handling, distant traffic, the particular hum of a room. Editors call it room tone and it runs under everything.
When separately generated shots carry the same tone, a viewer accepts them as one place even where lighting, geometry and surface detail do not quite agree.
Removing it has the opposite effect. Silence between shots reads as a cut to somewhere else, which makes generated inconsistencies more noticeable rather than less.
Footsteps supply weight the picture does not
Generated figures frequently move without convincing contact with the ground, drifting slightly or landing without impact. The eye registers this as something being off before it identifies what.
Adding footsteps timed to the visible steps asserts contact. The viewer's perception of weight comes substantially from the sound, and the ambiguous motion is read as correct.
This is standard practice in conventional film for the same reason, which is why the technique transfers directly rather than needing to be invented.
Sound bridges cover the joins
A sound that begins before its shot and continues after it makes the cut feel motivated. The technique long predates generated footage and works especially well on it.
Where two clips do not match precisely at their boundary, an audio element carrying across the edit gives the viewer a continuous thread while the picture changes.
Attention follows the continuous element, which means it is not available to examine the discontinuous one.
Perspective in the mix implies camera position
Sounds recorded close and sounds recorded far are different, and mixing accordingly tells the audience where the camera is standing.
Generated shots often lack clear spatial cues, so a mix that places dialogue close and traffic distant supplies a camera position the image only implies.
When the mix contradicts the framing, the shot feels wrong in a way viewers rarely attribute to sound, because they are looking at the picture.
The audio work is where the time goes
Teams producing finished pieces from generated clips consistently report that generation is quick and sound design is not. The ratio surprises people budgeting the work.
Sourcing and placing effects, building ambience beds and mixing for consistency is craft labor that has not been shortened by the same tools that shortened the picture.
That imbalance is currently the practical limit on turning generated footage into something an audience will sit through.