> **Experimental**
>
> `@aws-cdk/aws-medialive-alpha` is an [**experimental**](/stability) (alpha) package: its API may change in any release, without a major version bump.
# CaptionEncodeProps

Properties for a caption encode configuration.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/encode-configuration.ts`](https://github.com/aws/aws-cdk/blob/v2.274.0-alpha.0/packages/@aws-cdk/aws-medialive-alpha/lib/encode-configuration.ts#L895)

## Example

```ts
// Define a caption selector on the input attachment (see Input Attachment Settings below)
const captionSelector = medialive.CaptionSelector.embedded('captions');

// WebVTT captions — packaged alongside the video encode in the same output
const webvtt = medialive.EncodeConfiguration.caption({
  name: 'eng_webvtt',
  captionSelectorName: captionSelector.name,
  languageCode: 'eng',
  languageDescription: 'English',
  destination: medialive.CaptionDestination.webvtt(),
});

// Burned-in captions — rendered into the video, styled via the burn-in options
const burnIn = medialive.EncodeConfiguration.caption({
  name: 'eng_burnin',
  captionSelectorName: captionSelector.name,
  destination: medialive.CaptionDestination.burnIn({
    alignment: medialive.CaptionAlignment.CENTERED,
    fontColor: medialive.CaptionFontColor.WHITE,
    outlineColor: medialive.CaptionOutlineColor.BLACK,
    fontSize: medialive.CaptionFontSize.AUTO,
  }),
});
```

## Properties

- `accessibility`: [CaptionAccessibility](/cdk/api/v2/docs/@aws-cdk_aws-medialive-alpha.CaptionAccessibility.html) = The captions do not implement accessibility features — Whether this caption track implements accessibility features.

  **Default:** The captions do not implement accessibility features

- `captionDashRoles`: [CaptionDashRole](/cdk/api/v2/docs/@aws-cdk_aws-medialive-alpha.CaptionDashRole.html)[] = no DASH roles — The DASH roles to assign to this captions output.

  Applies only when the output is configured
  for DVB DASH accessibility signaling.

- `captionSelectorName`: string (required) — The name of the caption selector in the input to use as the source.

- `destination`: [CaptionDestination](/cdk/api/v2/docs/@aws-cdk_aws-medialive-alpha.CaptionDestination.html) (required) — The output caption format.

  Use the `CaptionDestination` factory methods (e.g.
  `CaptionDestination.burnIn()`, `.webvtt()`, `.embedded()`).

- `dvbDashAccessibility`: [DvbDashAccessibility](/cdk/api/v2/docs/@aws-cdk_aws-medialive-alpha.DvbDashAccessibility.html) = no DVB DASH accessibility signaling — DVB DASH accessibility signaling for this captions output.

  **Default:** no DVB DASH accessibility signaling

- `languageCode`: string = no language code — The ISO 639-2 language code for the captions (e.g. 'eng', 'spa').

- `languageDescription`: string = no language description — Human-readable description of the captions (e.g. 'English', 'Spanish').

- `name`: string (required) — A unique name for this caption encode.