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# AVVideoCompositionInstructionProtocol

A protocol that defines the interface for a video composition instruction.

```
protocol AVVideoCompositionInstructionProtocol : NSObjectProtocol, Sendable
```

## Overview

A video composition maintains an array of instructions that describe how to compose its content.

## Topics

### Getting track ID settings

[`passthroughTrackID`](/documentation/AVFoundation/AVVideoCompositionInstructionProtocol/passthroughTrackID)

An identifier of a source track to pass through without compositing.

[`requiredSourceTrackIDs`](/documentation/AVFoundation/AVVideoCompositionInstructionProtocol/requiredSourceTrackIDs)

The identifiers of the video tracks the instruction requires to compose frames.

[`requiredSourceSampleDataTrackIDs`](/documentation/AVFoundation/AVVideoCompositionInstructionProtocol/requiredSourceSampleDataTrackIDs)

The identifiers of the sample data tracks the instruction requires to compose frames.

### Getting tweening settings

[`containsTweening`](/documentation/AVFoundation/AVVideoCompositionInstructionProtocol/containsTweening)

A Boolean value that indicates whether the composition contains tweening.

### Getting post-processing status

[`enablePostProcessing`](/documentation/AVFoundation/AVVideoCompositionInstructionProtocol/enablePostProcessing)

A Boolean value that indicates whether the composition enables post-processing.

### Getting timing settings

[`timeRange`](/documentation/AVFoundation/AVVideoCompositionInstructionProtocol/timeRange)

The time range during which the instruction is effective.


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