Text to video with voiceover

One voice track, not one clip per scene

Narration is assembled into a single track laid over the scene sequence, and that track is the source of truth for timing, for the captions and for the length of the finished composition. It is not a set of clips each trapped inside its own scene. That distinction is what stops a video full of unnatural pauses where a line finished early and the cut had not arrived yet.

Dynamic stretches a little, calm stretches fully

The two pace settings resolve the clash differently. On dynamic, a scene grows by at most one and a half times to accommodate its line, and whatever is left of the line simply flows over the next cut, which is how ad editing actually works. On calm, the scene stretches to fit the whole line before cutting, which is what a tutorial needs because the viewer is following along on their own screen.

Per scene control once it exists

Every scene has its own narration text, its own language and voice, a delay in seconds before the voice starts, a playback speed of 0.85, 0.9, 1, 1.1 or 1.25 times, and a caption toggle. Regenerating narration grows the scene to fit the new audio and remembers the original duration as a base, so a shorter rewrite shrinks the scene back rather than leaving dead air at the end.

What the text does not control

Worth being clear. Your text becomes the script and the on-screen copy, but it does not choose the layouts, the colours, the transitions or the camera moves. Those come from the scene library and are deterministic. Which is why the same text run twice produces recognisably the same video rather than two different designs, and why editing the text afterwards does not rearrange the video around it.

How it works, in three steps

1. Step 1

   Paste the text as a brief

   Up to 8,000 characters. Write it as what you want said, not as a description of a video, and the director will divide it into scenes.

2. Step 2

   Pick the pace deliberately

   Dynamic for anything promotional, calm for anything instructional. It changes how narration and cuts negotiate, not just how it looks.

3. Step 3

   Fix the lines that run long

   Open the voice dialog on any scene that feels rushed, shorten the line or drop the speed to 0.9, and the scene retimes itself.

The full walkthrough with screenshots is in the guide Add voiceover, captions and music to a video.

Limits worth knowing

• Narration is synthesised text to speech. There is no emphasis markup, no pause tags and no per word control beyond delay and speed.
• Captions are derived from the narration text, so editing an on-screen caption does not change what the captions say.
• Each voiceover clip you generate in the builder spends one credit.
• The brief box takes 8,000 characters, which is a long script but not a document.

Questions people ask

Related pages