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Creating and Managing Transcoding Jobs in AWS Elemental MediaConvert

[JavaScript code example that applies to Node.js execution]

This Node.js code example shows:

  • How to create transcoding jobs in AWS Elemental MediaConvert.
  • How to cancel a transcoding job.
  • How to retrieve the JSON for a completed transcoding job.
  • How to retrieve a JSON array for up to 20 of the most recently created jobs.

The Scenario

In this example, you use a Node.js module to call AWS Elemental MediaConvert to create and manage transcoding jobs. The code uses the SDK for JavaScript to do this by using these methods of the AWS Elemental MediaConvert client class:

Prerequisite Tasks

To set up and run this example, first complete these tasks:

  • Install Node.js. For more information, see the Node.js website.
  • Create a shared configurations file with your user credentials. For more information about providing a shared credentials file, see Loading Credentials in Node.js from the Shared Credentials File.
  • Create and configure Amazon S3 buckets that provide storage for job input files and output files. For details, see Create Storage for Files in the AWS Elemental MediaConvert User Guide.
  • Upload the input video to the Amazon S3 bucket you provisioned for input storage. For a list of supported input video codecs and containers, see Supported Input Codecs and Containers in the AWS Elemental MediaConvert User Guide.
  • Create an IAM role that gives AWS Elemental MediaConvert access to your input files and the Amazon S3 buckets where your output files are stored. For details, see Set Up IAM Permissions in the AWS Elemental MediaConvert User Guide.

Configuring the SDK

Configure the SDK for JavaScript by creating a global configuration object, and then setting the region for your code. In this example, the region is set to us-west-2. Because AWS Elemental MediaConvert uses custom endpoints for each account, you must also configure the AWS.MediaConvert client class to use your account-specific endpoint. To do this, set the endpoint parameter on AWS.config.mediaconvert.

// Load the SDK for JavaScript
var AWS = require('aws-sdk');
// Set the region 
AWS.config.update({region: 'us-west-2'});
// Set the custom endpoint for your acccount
AWS.config.mediaconvert({endpoint: 'ACCOUNT_ENDPOINT'});

Defining a Simple Transcoding Job

Create a Node.js module with the file name emc_createjob.js. Be sure to configure the SDK as previously shown. Create the JSON that defines the transcode job parameters.

These parameters are quite detailed. You can use the AWS Elemental MediaConvert console to generate the JSON job parameters by choosing your job settings in the console, and then choosing Show job JSONat the bottom of the Job section. This example shows the JSON for a simple job.

var params = {
  "Queue": "JOB_QUEUE_ARN",
  "UserMetadata": {
    "Customer": "Amazon"
  },
  "Role": "IAM_ROLE_ARN",
  "Settings": {
    "OutputGroups": [
      {
        "Name": "File Group",
        "OutputGroupSettings": {
          "Type": "FILE_GROUP_SETTINGS",
          "FileGroupSettings": {
            "Destination": "s3://OUTPUT_BUCKET_NAME/"
          }
        },
        "Outputs": [
          {
            "VideoDescription": {
              "ScalingBehavior": "DEFAULT",
              "TimecodeInsertion": "DISABLED",
              "AntiAlias": "ENABLED",
              "Sharpness": 50,
              "CodecSettings": {
                "Codec": "H_264",
                "H264Settings": {
                  "InterlaceMode": "PROGRESSIVE",
                  "NumberReferenceFrames": 3,
                  "Syntax": "DEFAULT",
                  "Softness": 0,
                  "GopClosedCadence": 1,
                  "GopSize": 90,
                  "Slices": 1,
                  "GopBReference": "DISABLED",
                  "SlowPal": "DISABLED",
                  "SpatialAdaptiveQuantization": "ENABLED",
                  "TemporalAdaptiveQuantization": "ENABLED",
                  "FlickerAdaptiveQuantization": "DISABLED",
                  "EntropyEncoding": "CABAC",
                  "Bitrate": 5000000,
                  "FramerateControl": "SPECIFIED",
                  "RateControlMode": "CBR",
                  "CodecProfile": "MAIN",
                  "Telecine": "NONE",
                  "MinIInterval": 0,
                  "AdaptiveQuantization": "HIGH",
                  "CodecLevel": "AUTO",
                  "FieldEncoding": "PAFF",
                  "SceneChangeDetect": "ENABLED",
                  "QualityTuningLevel": "SINGLE_PASS",
                  "FramerateConversionAlgorithm": "DUPLICATE_DROP",
                  "UnregisteredSeiTimecode": "DISABLED",
                  "GopSizeUnits": "FRAMES",
                  "ParControl": "SPECIFIED",
                  "NumberBFramesBetweenReferenceFrames": 2,
                  "RepeatPps": "DISABLED",
                  "FramerateNumerator": 30,
                  "FramerateDenominator": 1,
                  "ParNumerator": 1,
                  "ParDenominator": 1
                }
              },
              "AfdSignaling": "NONE",
              "DropFrameTimecode": "ENABLED",
              "RespondToAfd": "NONE",
              "ColorMetadata": "INSERT"
            },
            "AudioDescriptions": [
              {
                "AudioTypeControl": "FOLLOW_INPUT",
                "CodecSettings": {
                  "Codec": "AAC",
                  "AacSettings": {
                    "AudioDescriptionBroadcasterMix": "NORMAL",
                    "RateControlMode": "CBR",
                    "CodecProfile": "LC",
                    "CodingMode": "CODING_MODE_2_0",
                    "RawFormat": "NONE",
                    "SampleRate": 48000,
                    "Specification": "MPEG4",
                    "Bitrate": 64000
                  }
                },
                "LanguageCodeControl": "FOLLOW_INPUT",
                "AudioSourceName": "Audio Selector 1"
              }
            ],
            "ContainerSettings": {
              "Container": "MP4",
              "Mp4Settings": {
                "CslgAtom": "INCLUDE",
                "FreeSpaceBox": "EXCLUDE",
                "MoovPlacement": "PROGRESSIVE_DOWNLOAD"
              }
            },
            "NameModifier": "_1"
          }
        ]
      }
    ],
    "AdAvailOffset": 0,
    "Inputs": [
      {
        "AudioSelectors": {
          "Audio Selector 1": {
            "Offset": 0,
            "DefaultSelection": "NOT_DEFAULT",
            "ProgramSelection": 1,
            "SelectorType": "TRACK",
            "Tracks": [
              1
            ]
          }
        },
        "VideoSelector": {
          "ColorSpace": "FOLLOW"
        },
        "FilterEnable": "AUTO",
        "PsiControl": "USE_PSI",
        "FilterStrength": 0,
        "DeblockFilter": "DISABLED",
        "DenoiseFilter": "DISABLED",
        "TimecodeSource": "EMBEDDED",
        "FileInput": "s3://INPUT_BUCKET_AND_FILE_NAME"
      }
    ],
    "TimecodeConfig": {
      "Source": "EMBEDDED"
    }
  }
};

Creating a Transcoding Job

After creating the job parameters JSON, call the createJob method by creating a promise for invoking an AWS.MediaConvert service object, passing the parameters. Then handle the response in the promise callback. The ID of the job created is returned in the response data.

// Create a promise on a MediaConvert object
var endpointPromise = new AWS.MediaConvert({apiVersion: '2017-08-29'}).createJob(params).promise();

// Handle promise's fulfilled/rejected status
endpointPromise.then(
  function(data) {
    console.log("Job created! ", data);
  },
  function(err) {
    console.log("Error", err);
  }
);

To run the example, type the following at the command line.

node emc_createjob.js

This sample code can be found here on GitHub.

Canceling a Transcoding Job

You can cancel jobs only while they are still in the queue. You can’t cancel jobs that have already started transcoding.

Create a Node.js module with the file name emc_canceljob.js. Be sure to configure the SDK as previously shown. Create the JSON that includes the ID of the job to cancel. Then call the cancelJob method by creating a promise for invoking an AWS.MediaConvert service object, passing the parameters. Handle the response in the promise callback.

// Load the AWS SDK for Node.js
var AWS = require('aws-sdk');
// Set the region 
AWS.config.update({region: 'us-west-2'});
// Set MediaConvert to customer endpoint
AWS.config.mediaconvert = {endpoint : 'ACCOUNT_ENDPOINT'};


var params = {
  Id: 'JOB_ID' /* required */
};


// Create a promise on a MediaConvert object
var endpointPromise = new AWS.MediaConvert({apiVersion: '2017-08-29'}).cancelJob(params).promise();

// Handle promise's fulfilled/rejected status
endpointPromise.then(
  function(data) {
    console.log("Job  " + params.Id + " is canceled", );
  },
  function(err) {
    console.log("Error", err);
  }
);

To run the example, type the following at the command line.

node ec2_canceljob.js

This sample code can be found here on GitHub.

Listing Recent Transcoding Jobs

Create a Node.js module with the file name emc_listjobs.js. Be sure to configure the SDK as previously shown.

Create the parameters JSON, including values to specify whether to sort the list in ASCENDING, or DESCENDING order, the ARN of the job queue to check, and the status of jobs to include. Then call the listJobs method by creating a promise for invoking an AWS.MediaConvert service object, passing the parameters. Handle the response in the promise callback.

// Load the AWS SDK for Node.js
var AWS = require('aws-sdk');
// Set the region 
AWS.config.update({region: 'us-west-2'});
// Set the customer endpoint
AWS.config.mediaconvert = {endpoint : 'ACCOUNT_ENDPOINT'};


var params = {
  MaxResults: 10,
  Order: 'ASCENDING',
  Queue: 'QUEUE_ARN',
  Status: 'SUBMITTED'
};

// Create a promise on a MediaConvert object
var endpointPromise = new AWS.MediaConvert({apiVersion: '2017-08-29'}).listJobs(params).promise();

// Handle promise's fulfilled/rejected status
endpointPromise.then(
  function(data) {
    console.log("Jobs: ", data);
  },
  function(err) {
    console.log("Error", err);
  }
);

To run the example, type the following at the command line.

node emc_listjobs.js

This sample code can be found here on GitHub.