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    CMS API Notifications

    In this topic, you will learn about CMS API notifications. The CMS API provides notifications of changes to the videos in your account, whether made by an account user or the Video Cloud system.


    You can receive notifications when video-change events occur in your video library. Notifications will be sent to the URL you specify, which should point to an application capable of handling HTTP POST requests.


    Like all requests to the CMS API, requests to set up or list notification subscriptions must be authenticated using an access token. The client credentials used to get the access token must have permissions for video-cloud/notifications/all (CMS->Notifications if you use the Studio UI to create the credentials.)


    You can specify up to 10 endpoints to receive notifications by making a POST request to{account_id}/subscriptions and including JSON in the request body like this:


    Notifications are sent in JSON format. Here's an example:


    Notification fields

    Item Description
    timestamp time when the event occurred in Epoch milliseconds
    account_id the Video Cloud account id
    event the type of event - currently this will always be video-change
    video the video ID
    version the version of the video - each set of change events increments the video version - for example, creation of a new set of renditions would constitute a set of change events

    Requests to create a subscription will receive an HTTP 422 error response for the following conditions:

    • The endpoint or events field is missing from the request body
    • The events field value is not a list (array)
    • The subscription defined already exists
    • You already have 10 subscriptions to this event

    Notification failures

    The notification system treats any 4xx or 5xx return from the customer server as a retry-able failure. Failing callbacks will be retried up to 20 times, with an exponentially increasing delay between subsequent callbacks. The first few retries will happen within minutes of the initial callback attempt. If the callback continues failing, and we get all the way out to the 20th retry, the retry delay will be a few days.


    In case your organization has a strict policy regarding sources of incoming traffic through your firewall, we allow the AWS us-east-1/Virginia IPs. This is subject to change, so all AWS IPs should be whitelisted. See for more information.

    Endpoint for notification subscriptions


    Create a new subscription

    To create a new subscription, submit a POST request with a request body including the endpoint that you want notifications delivered to and video-change as the single item in an events array:

            { "endpoint": "", "events": [ "video-change" ] }

    Get a list of your subscriptions

    To get a list of all your subscriptions, send a GET request to the subscriptions endpoint.

    Get or Delete a single subscription

    Use the following endpoint to get or delete a single subscription:



    A GET request will retrieve the subscription. A DELETE request will delete the subscription. You cannot update a subscription at this time. If you want to modify a subscription, you will need to delete it and create a new one.

    What triggers notifications?

    video-change events are triggered by any change in the video metadata. This includes any change to the video made in Studio or through a CMS API write method. There are also system events that will trigger video-change events.

    Changes that will trigger an event include:

    • A video is created
    • Ingestion of video or asset file starts
    • Ingestion of video or asset file is completed
    • Encoding of a new rendition finishes
    • A poster image is created
    • A thumbnail image is created
    • A video is activated or deactivated
    • A video is deleted
    • Video metadata is changed (by the system or a user)


    Retranscoding a video will not trigger a video-change event unless the resulting rendition set is different.

    There are system events that occur after a video is deleted, so you will receive notifications about a video after deleting it.

    What will not trigger a video-change event is a change to a video asset that does not change the video metadata. For example, if you replace a remote text track file or image, but the URL recorded in the video metadata remains the same, no video-change event will occur, and no notification will be sent.

    Page last updated on 27 Oct 2021