<!--
{
  "documentType" : "article",
  "framework" : "CoreMedia",
  "identifier" : "/documentation/CoreMedia/timebase-notifications",
  "metadataVersion" : "0.1.0",
  "role" : "collectionGroup",
  "title" : "Timebase Notifications"
}
-->

# Timebase Notifications

Keys that represent timebase notifications.

## Topics

### Constants

[`let kCMTimebaseNotification_EffectiveRateChanged: CFString`](/documentation/CoreMedia/kCMTimebaseNotification_EffectiveRateChanged)

A notification that posts by a timebase after a change in effective rate.

[`let kCMTimebaseNotification_TimeJumped: CFString`](/documentation/CoreMedia/kCMTimebaseNotification_TimeJumped)

A notification that posts by a timebase after a discontinuous time jump.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)