Amazon Elastic Transcoder
Developer Guide (API Version 2012-09-25)

Step 6: Monitor the Progress of Your Job

When you created a pipeline in Step 3: Create a Pipeline, you had the option to configure notifications, so Elastic Transcoder sends a message to an Amazon Simple Notification Service (Amazon SNS) topic when Elastic Transcoder begins processing a job and finishes processing a job. If you configured notifications and if you subscribed to the applicable Amazon SNS topic, you can monitor the progress of your job.