# AVPlayerItemSampleBufferOutputDelegate Defines common delegate methods for objects participating in sample buffer output. ``` @protocol AVPlayerItemSampleBufferOutputDelegate ``` ## Topics ### Responding to output events [`- outputMediaDataAvailable:`](/documentation/AVFoundation/AVPlayerItemSampleBufferOutputDelegate/outputMediaDataAvailable:) Invoked when the output becomes ready to deliver a sample buffer. [`- outputSequenceWasRestarted:`](/documentation/AVFoundation/AVPlayerItemSampleBufferOutputDelegate/outputSequenceWasRestarted:) Invoked when the output is commencing a new sequence. ## Relationships ### Inherits From [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) --- Copyright © 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)