# init(postProcessingAsVideoLayers:in:) Composes the composited video frames with the Core Animation layer. ``` convenience init(postProcessingAsVideoLayers videoLayers: [CALayer], in animationLayer: CALayer) ``` ## Parameters `videoLayers` An array containing the video layers `animationLayer` The animation layer. ## Return Value A new `AVVideoCompositionCoreAnimationTool` instance with the composited video frames and the rendered animation layer. ## Discussion Duplicates the composited video frames in each videoLayer and renders animationLayer to produce the final frame. The `videoLayers` should be in `animationLayer`’s sublayer tree. The `animationLayer` should not come from, or be added to, another layer tree. > Note: > On iOS, a layer instance backing a usually have their content flipped, as defined by the method. It may be required to insert a instance with its property set to in the layer hierarchy to get the same result when attaching a layer to the receiver when the layer backs a . --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)