# Karaoke
URL: https://remocn.dev/docs/captions/components/caption-karaoke

Each word fills with colour left to right exactly as it is spoken, with the whole phrase readable before the voice reaches it

- Install: `npx shadcn@latest add @remocn/caption-karaoke`
- Vibe: social
- Natural length: transcript-driven

## Installation

```bash
npx shadcn@latest add @remocn/caption-karaoke
```

## Usage

`CaptionKaraoke` takes a timed transcript and renders only the text block, so
place it inside your own `AbsoluteFill`. See [Positioning](/docs/captions/getting-started/positioning)
for safe placements and [Get a transcript](/docs/captions/getting-started/get-a-transcript)
for producing `captions.json`.

```tsx
import { AbsoluteFill } from "remotion";
import { CaptionKaraoke } from "@/components/remocn/caption-karaoke";
import captions from "./captions.json";

export const MyScene = () => (
  <AbsoluteFill
    style={{
      justifyContent: "flex-end",
      alignItems: "center",
      paddingBottom: 108,
      paddingInline: 192,
    }}
  >
    <CaptionKaraoke captions={captions} />
  </AbsoluteFill>
);
```

## Props

| Prop | Type | Default | Description |
|---|---|---|---|
| `captions` | `Caption[]` | `—` | The timed transcript, in the `Caption` shape from `@remotion/captions`. Times are relative to the start of the surrounding `Sequence`. |
| `combineTokensWithinMilliseconds` | `number` | `1200` | How much speech one page may span before the next word starts a new page. Pages also break at the end of a sentence and on any pause of at least `holdMs` (300 ms minimum). |
| `holdMs` | `number` | `600` | How long a page stays after its last word when the next page is not already due. It fades out at the end of the hold instead of hanging through the pause. |
| `fontSize` | `number` | `64` | Font size in pixels. |
| `fontWeight` | `number` | `800` | Font weight. The font itself is inherited. |
| `color` | `string` | `"#ffffff"` | Colour of words the voice has not reached yet. |
| `activeColor` | `string` | `"#facc15"` | Colour that fills each word as it is spoken. |
| `shadow` | `boolean` | `true` | A tight text shadow that keeps the caption legible over bright footage. |
| `className` | `string` | `—` | Classes for the text block — width, font family, `uppercase`. |

## Use when
- A voiceover or talking head needs captions and the viewer should be able to read ahead — the full phrase is on screen, the fill only shows where the voice is.
- The pace of the speech is part of the point — a slow word fills slowly and a quick one snaps, so the captions carry the rhythm of the delivery.

## Don't use when
- There is no voiceover and the text is scripted — use `word-stream`, which paces phrases with its own timing.
- You want letters typed out on their own clock rather than following a recording — use `typewriter`.