---
title: videoComposition
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avassetimagegenerator/videocomposition
---

# videoComposition

A video composition to use when extracting images from assets with multiple video tracks.

## Declaration

```swift
@NSCopying var videoComposition: AVVideoComposition? { get set }
```

## Discussion

Discussion If you don’t specify a video composition, the generator only uses the first enabled video track. If specify a video composition, the image generator ignores the value of the appliesPreferredTrackTransform property. Setting a video composition with any of the following attributes generates an exception: A renderScale not equal to 1.0. A renderSize with a width or height less than 0. A frameDuration that’s invalid, or less than or equal to zero. A sourceTrackIDForFrameTiming less than zero.

## See Also

### Configuring compositing

- [customVideoCompositor](avfoundation/avassetimagegenerator/customvideocompositor.md)