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# AVVideoCompositionLayerInstruction

An object used to modify the transform, cropping, and opacity ramps applied to a given track in a composition.

```
class AVVideoCompositionLayerInstruction
```

## Topics

### Creating a layer instruction

[`init(configuration:)`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/init(configuration:))

Initialize an AVVideoCompositionLayerInstruction with a configuration.

[`AVVideoCompositionLayerInstruction.Configuration`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/Configuration)

Configurable properties for initializing a new AVVideoCompositionLayerInstruction instance.

[`videoCompositionLayerInstructionWithLayerInstruction:`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/videoCompositionLayerInstructionWithLayerInstruction:)

Pass-through initializer, for internal use in AVFoundation only

### Getting the track ID

[`trackID`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/trackID)

The track identifier of the source track to which the compositor will apply the instruction.

### Getting opacity, transform, and cropping ramps

[`cropRectangleRamp(at:)`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/cropRectangleRamp(at:))

Obtains the crop rectangle ramp that includes the specified time.

[`AVVideoCompositionLayerInstruction.CropRectangleRamp`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/CropRectangleRamp)

[`getCropRectangleRamp(for:startCropRectangle:endCropRectangle:timeRange:)`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/getCropRectangleRamp(for:startCropRectangle:endCropRectangle:timeRange:))

Obtains the crop rectangle ramp that includes the specified time.

[`opacityRamp(at:)`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/opacityRamp(at:))

Obtains the opacity ramp that includes a specified time.

[`AVVideoCompositionLayerInstruction.OpacityRamp`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/OpacityRamp)

[`getOpacityRamp(for:startOpacity:endOpacity:timeRange:)`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/getOpacityRamp(for:startOpacity:endOpacity:timeRange:))

Obtains the opacity ramp that includes a specified time.

[`transformRamp(at:)`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/transformRamp(at:))

Obtains the transform ramp that includes a specified time.

[`AVVideoCompositionLayerInstruction.TransformRamp`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/TransformRamp)

[`getTransformRamp(for:start:end:timeRange:)`](/documentation/AVFoundation/AVVideoCompositionLayerInstruction/getTransformRamp(for:start:end:timeRange:))

Obtains the transform ramp that includes a specified time.


---

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