The Dolby.io Media Enhance API is designed to improve the sound of your media. Our algorithms analyze your media and make corrections to quickly improve and produce professional quality audio. By using this API you can automate typically labor intensive and specialized media processing tasks to improve:

Speech leveling
Noise reduction
Loudness correction
Speech isolation
Sibilance reduction
Plosive reduction
Dynamic equalization
Tone shaping

This tutorial will show you how to use the API to build a range of applications such as podcast tools, online learning platforms, interviews, or social video sharing.

⚠️
Not a Developer?
To get started without writing any code, you can use the Media Demo to upload a file and view the results.

Getting started

To get started you'll follow these steps.

Get your API token
Prepare your media
Make a Media Enhance request
Check the results
Review the output

👍
Prefer to watch a video?
We also have a video tutorial for getting started.

1. Get your API token

To use the Media Enhance API, you need an API token. To learn more about how to get an API token, see API Authentication.

2. Prepare your media

Make your media available for enhancing:

a. Use your own cloud storage provider
b. Use our Dolby Media Input API

a. Use your own cloud storage provider

You will want to consider this option when you move your applications into production. Our services are able to work with many popular cloud storage services such as AWS S3, Azure Blob Storage, GCP Cloud Storage, or your own services with HTTP(s) and basic authentication.

See the Media Input and Output guide for more detail on various storage options.

b. Use our Dolby Media Input API (optional)

The Media Input API was designed to give you a quick way to upload media while evaluating the Media APIs. We can securely store your media temporarily, any media you upload will be removed regularly so shouldn't be used for permanent storage.

Call Start Media Input to identify a shortcut url. It must begin with dlb:// but otherwise is your own personal unique identifier. Some valid examples:

dlb://example.mp4
dlb://input/your-favorite-podcast.mp4
dlb://usr/home/me/voice-memo.wav

You can think of this like an object key that is used to identify a file for your account. Once you call POST /media/input you'll be returned a new url in the response. This is a pre-signed URL to a cloud storage location you will use to upload the file. You do that by making a PUT request with your media.

import os
import requests

# Set or replace these values

file_path = os.environ["INPUT_MEDIA_LOCAL_PATH"]

# Declare your dlb:// location

url = "https://api.dolby.com/media/input"
headers = {
    "Authorization": "Bearer {0}".format(api_token),
    "Content-Type": "application/json",
    "Accept": "application/json"
}

body = {
    "url": "dlb://in/example.mp4",
}

response = requests.post(url, json=body, headers=headers)
response.raise_for_status()
data = response.json()
presigned_url = data["url"]

# Upload your media to the pre-signed url response

print("Uploading {0} to {1}".format(file_path, presigned_url))
with open(file_path, "rb") as input_file:
  requests.put(presigned_url, data=input_file)

// This example will read a file from your local computer
// and upload it to storage.  You'll need to install node, npm,
// and axios.

const fs = require("fs")
const axios = require("axios").default

// Set or replace these values

const file_path = process.env.INPUT_MEDIA_LOCAL_PATH

// Declare your dlb:// location

const config = {
  method: "post",
  url: "https://api.dolby.com/media/input",
  headers: {
    "Authorization": `Bearer ${api_token}`,
    "Content-Type": "application/json",
    "Accept": "application/json"
  },
  data: {
    url: "dlb://in/example.mp4",
  },
}

axios(config)
  .then(function(response) {
    // Upload your media to the pre-signed url response
    console.log(`Upload ${file_path} to ${response.data.url}`);

    const upload_config = {
      method: "put",
      url: response.data.url,
      data: fs.createReadStream(file_path),
      maxContentLength: Infinity,
      maxBodyLength: Infinity,
      headers: {
        "Content-Type": "application/octet-stream",
        "Content-Length": fs.statSync(file_path).size,
      },
    }
    axios(upload_config)
      .then(function() {
        console.log("File uploaded")
      })
      .catch(function(error) {
        console.log(error)
      })
  })
  .catch(function(error) {
    console.log(error)
  })

curl -X POST https://api.dolby.com/media/input \
    --header "Authorization: Bearer $API_TOKEN" \
    --header 'Content-Type: application/json' \
    --header 'Accept: application/json' \
    --data '{
      "url": "dlb://in/example.mp4"
   }'

# Use the result in a second command replacing `$PRE_SIGNED_URL` with the response from the previous command:

curl -X PUT $PRE_SIGNED_URL -T ./your-local-media.mp4

Once the upload is complete, you'll be able to refer to this media with the dlb://in/example.mp4 shortcut.

3. Make a Media Enhance request

The Media Enhance API requires both an input and an output parameter to begin enhancing your media. There are additional parameters that can be used to customize the results based on the type of content and preferences you might have beyond the basic example here.

Regardless of whether you chose to use your own cloud storage or he Dolby.io /media/input service, the Dolby.io API will need to be able to read the media. See the Media Input and Output guide for a more detailed explanation of various ways you can provide authentication details.

These are all valid input values:

dlb://in/example.mp4
s3://dolbyio/public/shelby/airplane.original.mp4
https://dolbyio.s3-us-west-1.amazonaws.com/public/shelby/indoors.original.mp4

Similarly, for output you can use any location which our APIs will be able to write to. As this is less common, specifying a dlb:// output location will create one on the fly.

Here is an example:

import os
import requests

# Set or replace these values
body = {
  "input" : "s3://dolbyio/public/shelby/airplane.original.mp4",
  "output" : "dlb://out/example-enhanced.mp4",
  "content" : {
      "type": "mobile_phone"
  }
}

url = "https://api.dolby.com/media/enhance"
headers = {
    "Authorization": "Bearer {0}".format(api_token),
    "Content-Type": "application/json",
    "Accept": "application/json"
}

response = requests.post(url, json=body, headers=headers)
response.raise_for_status()
print(response.json())

const axios = require("axios").default

const config = {
  method: "post",
  url: "https://api.dolby.com/media/enhance",
    "headers": {
       "Authorization": `Bearer ${api_token}`,
       "Content-Type": "application/json",
       "Accept": "application/json"
  },
  data: {
    input: "s3://dolbyio/public/shelby/airplane.original.mp4",
    output: "dlb://out/example-enhanced.mp4",
  },
}

axios(config)
  .then(function(response) {
    console.log(response.data.job_id)
  })
  .catch(function(error) {
    console.log(error)
  })

curl -X POST https://api.dolby.com/media/enhance \
      --header "Authorization: Bearer $API_TOKEN" \
      --header 'Content-Type: application/json' \
      --header 'Accept: application/json' \
      --data '{
         "input": "s3://dolbyio/public/shelby/airplane.original.mp4",
         "output": "dlb://out/example-enhanced.mp4"
      }'

Provide the type of content along with your input and output parameters to best enhance the audio quality for your media scenario. These common media scenarios include user-generated content from a mobile_phone or producing a podcast. See the How to Improve Quality by Content Type for more content types information.

The JSON response will include a unique job_id that you'll need to use to check on the status of media processing.

{"job_id":"b49955b4-9b64-4d8b-a4c6-2e3550472a33"}

You can explore the Enhance API Reference to learn more about other options to customize the behavior of the media processing.

4. Check the job status

It will take a few moments for the API to enhance your file. You'll need to check the status of the job. You can learn more about this in the How It Works section of the Introduction to learn more.

For this GET /media/enhance request you'll need to use the job id returned from the previous step. In these examples, it is specified as an environment variable that you'll need to set or replace in the code samples.

import os
import requests

url = "https://api.dolby.com/media/enhance"
headers = {
    "Authorization": "Bearer {0}".format(api_token),
    "Content-Type": "application/json",
    "Accept": "application/json"
}

# TODO: You must replace this value with the job ID returned from the previous step.

params = {
  "job_id": os.environ["DOLBYIO_JOB_ID"]
}

response = requests.get(url, params=params, headers=headers)
response.raise_for_status()
print(response.json())

const axios = require("axios").default

const config = {
  method: "get",
  url: "https://api.dolby.com/media/enhance",
    "headers": {
       "Authorization": `Bearer ${api_token}`,
       "Content-Type": "application/json",
       "Accept": "application/json"
  },
  
  //TODO: You must replace this value with the job ID returned from the previous step.
  
  params: {
    job_id: process.env.DOLBYIO_JOB_ID,
  },
}

axios(config)
  .then(function(response) {
    console.log(JSON.stringify(response.data, null, 4))
  })
  .catch(function(error) {
    console.log(error)
  })

curl -X GET "https://api.dolby.com/media/enhance?job_id=$DOLBYIO_JOB_ID" \
     --header "Authorization: Bearer $API_TOKEN" \
     
      # TODO: You must replace this value with the job ID returned from the previous step.

While the job is still in progress, you will be able to see the status and progress values returned.

{
  "path": "/media/enhance",
  "status": "Running",
  "progress": 42
}

If you re-run and call again after a period of time you'll see the status changes and the output you originally specified will be ready for downloading.

{
  "path": "/media/enhance",
  "progress": 100,
  "result": {},
  "status": "Success"
}

5. Review media

Once media processing is complete, the file will be PUT in the output location specified when the job was started. If you used the optional Dolby.io temporary storage, you will need to follow a couple steps to download your media. For more information, see the Dolby.io Media Temporary Cloud Storage guide.

import os
import shutil
import requests

output_path = os.environ["OUTPUT_MEDIA_LOCAL_PATH"]

url = "https://api.dolby.com/media/output"
headers = {
    "Authorization": "Bearer {0}".format(api_token),
    "Content-Type": "application/json",
    "Accept": "application/json"
}

args = {
    "url": "dlb://out/example-enhanced.mp4",
}

with requests.get(url, params=args, headers=headers, stream=True) as response:
    response.raise_for_status()
    response.raw.decode_content = True
    print("Downloading from {0} into {1}".format(response.url, output_path))
    with open(output_path, "wb") as output_file:
        shutil.copyfileobj(response.raw, output_file)

const fs = require("fs")
const axios = require("axios").default

const output_path = process.env.OUTPUT_MEDIA_LOCAL_PATH

const config = {
  method: "get",
  url: "https://api.dolby.com/media/output",
  headers: {
    "Authorization": `Bearer ${api_token}`,
    "Content-Type": "application/json",
    "Accept": "application/json"
  },
  responseType: "stream",
  params: {
    url: "dlb://out/example-enhanced.mp4",
  },
}

axios(config)
  .then(function(response) {
    response.data.pipe(fs.createWriteStream(output_path))
    response.data.on("error", function(error) {
      console.log(error)
    })
    response.data.on("end", function() {
      console.log("File downloaded!")
    })
  })
  .catch(function(error) {
    console.log(error)
  })

# You specify the `-L` because the service will redirect you to a cloud storage location. 
# You shouldn't try to retrieve directly from the cloud storage as the location may change, 
# so use **/media/output** with the shortcut instead. 
# The `-O` is to just output the file to your local system with the same filename.

curl  -X GET "https://api.dolby.com/media/output?url=dlb://out/example-enhanced.mp4" \
      -O -L \
     --header "Authorization: Bearer $API_TOKEN" \

Take a listen to the enhanced media.

Learn more

Continue to learn about all that this API can can do by reviewing the Enhance API Guide. Pricing and other details are available from the product page .