The Media Processing Service (MPS) supports callback notification methods based on message queues, cloud functions, and HTTP push.
What Do I Do If I Do Not Receive Callbacks?
If you successfully uploaded a file but did not receive a notification containing the file transcoding result after a certain amount of time, possible reasons include:
The workflow was not set up correctly. Please check the workflow settings.
If you initiated the transcoding task through an API and the call was successful, you can use the DescribeTaskDetail API to query the task progress.
Message backlog in the task queue can cause prolonged processing or other service exceptions. You can submit a ticket to query your queue status.