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# AVPlayerItemOutputPullDelegate

Methods you can implement to respond to pixel buffer changes.

```
protocol AVPlayerItemOutputPullDelegate : NSObjectProtocol, Sendable
```

## Overview

The methods in this protocol are called by [`AVPlayerItemVideoOutput`](/documentation/AVFoundation/AVPlayerItemVideoOutput) objects.

## Topics

### Responding to pixel buffer changes

[`outputMediaDataWillChange(_:)`](/documentation/AVFoundation/AVPlayerItemOutputPullDelegate/outputMediaDataWillChange(_:))

Tells the delegate that new samples are about to arrive.

[`outputSequenceWasFlushed(_:)`](/documentation/AVFoundation/AVPlayerItemOutputPullDelegate/outputSequenceWasFlushed(_:))

Tells the delegate that a new sample sequence is commencing.


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