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# AVMutableVideoCompositionInstruction

A mutable video composition instruction subclass.

```
class AVMutableVideoCompositionInstruction
```

## Overview

An [`AVVideoComposition`](/documentation/AVFoundation/AVVideoComposition) object maintains an array of [`instructions`](/documentation/AVFoundation/AVVideoComposition/instructions) to perform its composition.

## Topics

### Creating an instruction

[`videoCompositionInstruction`](/documentation/AVFoundation/AVMutableVideoCompositionInstruction/videoCompositionInstruction)

Returns a new mutable video composition instruction.

### Configuring the instructions

[`backgroundColor`](/documentation/AVFoundation/AVMutableVideoCompositionInstruction/backgroundColor)

The background color of the composition.

[`layerInstructions`](/documentation/AVFoundation/AVMutableVideoCompositionInstruction/layerInstructions)

Instructions that specify how to layer and compose video frames from source tracks.

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

The time range to which the instruction applies.

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

A Boolean value that indicates whether the instruction requires post processing.

### Configuring source tracks

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

The track identifiers of source sample data that the compositor requires to compose frames for the instruction.


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