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

Options for a Teletext caption source.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/caption-selector.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0-alpha.0/packages/@aws-cdk/aws-medialive-alpha/lib/caption-selector.ts#L179)

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import * as medialive_alpha from '@aws-cdk/aws-medialive-alpha';
const teletextCaptionSourceOptions: medialive_alpha.TeletextCaptionSourceOptions = {
  outputRectangle: {
    height: 123,
    leftOffset: 123,
    topOffset: 123,
    width: 123,
  },
  pageNumber: 'pageNumber',
};
```

## Properties

- `outputRectangle`: [CaptionRectangle](/cdk/api/v2/docs/@aws-cdk_aws-medialive-alpha.CaptionRectangle.html) — The caption rectangle to use when converting this source to EBU-TT-D or TTML.

  **Default:** no rectangle (service default)

- `pageNumber`: string — The Teletext page number to extract captions from, as a hexadecimal string with no `0x` prefix (range `100`–`8FF`).

  **Default:** MediaLive service default

  Unused for passthrough.