# Add music and voiceover

Motion makes silent videos by default. Ask for a voiceover or music in your prompt to add sound.

Source: https://infinall.ai/docs/motion/music-and-voice
Last checked: 2026-10-26

## What it is

A plain Motion prompt makes a silent video. If your prompt asks for a voiceover or for music, Motion adds it. The music is a track from a built-in library, chosen to fit the style and cut to the length of your video.

## Who can use it

Everyone. Free and Pro both get voiceover and music through the prompt.

## Cost

Uses credits. A voiceover is extra AI work on top of the video, so the video uses more. Motion is charged on what the video uses. Music from the built-in library adds no generation cost of its own. See [Price before you confirm](/docs/credits/price-before-you-confirm).

## Where to find it

There is no separate sound control. Write it in the prompt box in a **Studio** project with **Motion** chosen in **What to make**.

## Buttons and controls

![The Motion prompt box with a prompt that asks for a voiceover and music.](/docs/screens/motion/music-and-voice.webp)

<!-- shot: motion/music-and-voice -->

| # | Name in the app | What it does | Plan |
| --- | --- | --- | --- |
| 1 | Scenes, on-screen text, transitions, length and aspect (e.g. 15 s, 9:16, 4 text scenes plus logo end card) | The prompt box. Ask for sound here. | Both |
| 2 | Voice typing | Speak your prompt instead of typing it. | Both |
| 3 | Generate motion video | Starts the video with the sound you asked for. | Both |

## How to add a voiceover

1. Open the Motion box.
2. Write your prompt and add that it needs a voiceover. For example: "20 s, 16:9 product reveal with a voiceover."
3. Optional: write the exact lines for each scene in the prompt. They are used as the voiceover.
4. Click **Generate motion video**.
5. In the activity card, look for the **Recording the voiceover** row. Open it to read the lines.

## How to add music

1. Write your prompt and add that it needs music. For example: "15 s promo with upbeat music."
2. Click **Generate motion video**.
3. Look for **Composing music** in the activity card. Open it to see the direction used.
4. When the soundtrack is ready, **Mixing voice, music and effects** finishes.

## How to keep it silent

Say "no music", "no voiceover" or "silent" in the prompt. A prompt that does not mention sound is silent.

## Options explained

**Words that ask for a voiceover.** Voiceover, voice over, narration, narrator, spoken, voice.

**Words that ask for music.** Music, soundtrack, background music, beat, tune, track, score.

**What the music is.** A free track from the built-in library. Its mood is matched to your prompt, for example calm, upbeat, cinematic or playful. It is faded and fitted to the length of the video.

**What the voiceover is.** Spoken lines placed on your scenes. Their length can change how long each scene runs.

## Limits

- One music track runs under the whole video.
- Voiceover and music are only added when your prompt asks for them.
- There is no voice or track picker in the Motion box.

## When something goes wrong

| Message in the app | What it means | What to do |
| --- | --- | --- |
| Music could not be generated | A row in the activity feed. The music step failed. The video still finishes. | Try again, or leave music out. |
| Couldn't make that motion video. | The video failed. If you asked for a voiceover and the voice service was down, the video does not start. | Try again in a moment. If it keeps failing, leave the voiceover out. |
| Picked music. | Your message was only a music request, so no video was made. | Describe the whole video and ask for music inside that prompt. |

## Questions

### Can I choose the voice?

Not in the Motion box. Use the Audio mode when you need a chosen voice.

### Can I choose the music track?

Not in the Motion box. The track is picked to fit your prompt.

### Can I use my own music?

There is no attach button in the Motion box today, so you cannot add your own track.

### Why is my video silent?

A prompt with no words about sound makes a silent video. Add "with a voiceover" or "add music".

### Do I pay extra for sound?

A voiceover is more AI work, so the video uses more credits. The built-in music has no generation cost of its own.