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

Properties for an audio-silence failover condition.

- Stability: [Experimental](/cdk/api/stability.html)
- Source: [`lib/input-attachment.ts`](https://github.com/aws/aws-cdk/blob/v2.275.0-alpha.0/packages/@aws-cdk/aws-medialive-alpha/lib/input-attachment.ts#L213)

## Example

```ts
declare const stack: Stack;
declare const primaryInput: medialive.IInput;
declare const secondaryInput: medialive.IInput;
declare const audioSelector: medialive.AudioSelector;
declare const video: medialive.EncodeConfiguration;
declare const audio: medialive.EncodeConfiguration;
declare const bucket: s3.IBucket;

new medialive.Channel(stack, 'Channel', {
  inputs: [{
    input: primaryInput,
    automaticInputFailover: {
      secondaryInput,
      inputPreference: medialive.InputPreference.PRIMARY_INPUT_PREFERRED,
      errorClearTime: Duration.seconds(3),
      failoverConditions: [
        medialive.FailoverCondition.inputLoss({ threshold: Duration.millis(1500) }),
        medialive.FailoverCondition.audioSilence({ audioSelector, threshold: Duration.seconds(2) }),
        medialive.FailoverCondition.videoBlack({ blackDetectThreshold: 0.1, threshold: Duration.seconds(1) }),
      ],
    },
  }, {
    // The secondary input must also be attached to the channel as its own input.
    input: secondaryInput,
  }],
  outputGroups: [
    medialive.OutputGroupConfiguration.hls({
      name: 'hls',
      destinations: [medialive.OutputDestination.toBucket(bucket, 'live/stream')],
      outputs: [{ encodes: [video, audio], outputName: 'hls_out' }],
    }),
  ],
});
```

## Properties

- `audioSelector`: [AudioSelector](/cdk/api/v2/docs/@aws-cdk_aws-medialive-alpha.AudioSelector.html) (required) — The audio selector (defined on the input attachment) that MediaLive monitors for silence.

  Pass the same `AudioSelector` instance you put in the attachment's
  `audioSelectors` — select your most important rendition.

- `threshold`: [Duration](/cdk/api/v2/docs/aws-cdk-lib.Duration.html) — How long the audio must be silent (audio loss, or quieter than -50 dBFS) before failover occurs.

  **Default:** MediaLive service default