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# AVVideoCompositionCoreAnimationTool

An object used to incorporate Core Animation into a video composition.

```
class AVVideoCompositionCoreAnimationTool
```

## Overview

Any animations will be interpreted on the video’s timeline, not real-time, so you should:

1. Set animations’ <doc://com.apple.documentation/documentation/QuartzCore/CAMediaTiming/beginTime> property to [`AVCoreAnimationBeginTimeAtZero`](/documentation/AVFoundation/AVCoreAnimationBeginTimeAtZero) rather than `0` (which CoreAnimation replaces with <doc://com.apple.documentation/documentation/QuartzCore/CACurrentMediaTime()>);
2. Set <doc://com.apple.documentation/documentation/QuartzCore/CAAnimation/isRemovedOnCompletion> to <doc://com.apple.documentation/documentation/Swift/false> on animations so they are not automatically removed;
3. Avoid using layers that are associated with <doc://com.apple.documentation/documentation/UIKit/UIView> objects.

## Topics

### Creating a composition tool

[`init(additionalLayer:asTrackID:)`](/documentation/AVFoundation/AVVideoCompositionCoreAnimationTool/init(additionalLayer:asTrackID:))

Adds a Core Animation layer to the video composition.

[`init(postProcessingAsVideoLayer:in:)`](/documentation/AVFoundation/AVVideoCompositionCoreAnimationTool/init(postProcessingAsVideoLayer:in:))

Composes the composited video frame with a Core Animation layer.

[`init(postProcessingAsVideoLayers:in:)`](/documentation/AVFoundation/AVVideoCompositionCoreAnimationTool/init(postProcessingAsVideoLayers:in:))

Composes the composited video frames with the Core Animation layer.

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

Compose the composited video frames with the Core Animation layer.

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

Configurable properties for initializing a new AVVideoCompositionCoreAnimationTool instance.


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