# Container

`container` _string_

Text to Speech Request  Text to Speech Stream  English Only

The Container feature allows users to specify the desired file format wrapper for the output audio generated through text-to-speech synthesis.

Choosing the appropriate container format for the audio output is essential for compatibility with different playback devices and applications. Container formats wrap the audio data along with metadata, enabling efficient storage and transmission.

:::callout{intent="warning"}
The container format value must adhere to the [Audio Format Combinations table](/guides/media-output-settings-index#audio-format-combinations). Select a value based on the encoding type and your use case. Based on encoding `wav` or `ogg` are possible defaults.
:::

## Enable Feature

To enable the Container feature, include the `container` parameter in the query string with the desired container format value.

**`Text`**

```text Text
https://api.deepgram.com/v1/speak?encoding=linear16&container=wav
```

:::callout{intent="info"}
If you are using the [TTS Web Socket](/guides/self-hosted-deployments-2-reference-text-to-speech-speak-streaming) `container=none` can be used in your request but no other audio formats are currently supported.
:::

### CURL Example

You can use the following cURL command in a terminal or your favorite API client to synthesize text into speech with a specific container.

**WAV container format**:

**`cURL`**

```bash cURL
curl --request POST \
     --url "https://api.deepgram.com/v1/speak?model=aura-2-thalia-en&encoding=linear16&container=wav" \
     --header "Authorization: Token DEEPGRAM_API_KEY" \
     --header 'Content-Type: application/json' \
     --data '{"text": "Hello, how can I help you today?"}' \
     --output container_wav_output.wav \
     --write-out "Time-to-First-Byte: %{time_starttransfer}s Time-to-Last-Byte: %{time_total}s\n" \
     --fail-with-body \
     --silent || echo "Request failed"
```

:::callout{intent="warning"}
Replace `YOUR_DEEPGRAM_API_KEY` with your [Deepgram API Key](/guides/guides-docs-create-additional-api-keys).
:::

### Query Parameters

| Parameter   | Value                                                                                                                                                    | Type     | Description                                           |
| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- | ----------------------------------------------------- |
| `container` | See list of supported audio format combinations in the [Audio Format Combinations table](/guides/media-output-settings-index#audio-format-combinations). | `string` | The desired file format wrapper for the output audio. |

:::callout{intent="info"}
When using VoIP (Voice over Internet Protocol), we recommend adding `container=none` to your request to prevent request header information being misinterpreted as audio, which can result in static or click sounds.
:::

## Analyze Response

Upon successful processing of the request, you will receive an audio file containing the synthesized text-to-speech output, along with response headers providing additional information.

:::callout{intent="info"}
The audio file is streamed back to you, so you may begin playback as soon as the first byte arrives. Read the guide [Streaming Audio Outputs](/guides/results-processing-2-streaming-the-audio-output) to learn how to begin playing the stream immediately versus waiting for the entire file to arrive.
:::

### Response Headers Example

**`http`**

```text http
HTTP/1.1 200 OK
< content-type: audio/mpeg
< dg-model-name: aura-2-thalia-en
< dg-model-uuid: e4979ab0-8475-4901-9d66-0a562a4949bb
< dg-char-count: 32
< dg-request-id: bf6fc5c7-8f84-479f-b70a-602cf5bf18f3
< transfer-encoding: chunked
< date: Thu, 29 Feb 2024 19:20:48 GMT
```

:::callout{intent="info"}
To see these response headers when making a CURL request, add `-v` or `--verbose` to your request.
:::

This includes:

- `content-type`: Specifies the media type of the resource, in this case, `audio/mpeg`, indicating the format of the audio file returned.
- `dg-request-id`: A unique identifier for the request, useful for debugging and tracking purposes.
- `dg-model-uuid`: The unique identifier of the model that processed the request.
- `dg-char-count`: Indicates the number of characters that were in the input text for the text-to-speech process.
- `dg-model-name`: The name of the model used to process the request.
- `transfer-encoding`: Specifies the form of encoding used to safely transfer the payload to the recipient.
- `date`: The date and time the response was sent.

## Related pages

- [Amazon SageMaker](./amazon-sagemaker-index.md)
- [Aura](./aura-index.md)
- [Changelog](../changelog.md)
- [Custom Vocabulary](./custom-vocabulary-index.md)
- [Deepgram's Docs](../index.md)
- [Deployment](./deployment-index.md)
- [Docker/Podman](./docker-podman-index.md)
- [Features](./features-index.md)
- [Flux TTS](./flux-tts-index.md)
- [Formatting](./formatting-index.md)

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