<!--
{
  "availability" : [
    "iOS: 4.0.0 -",
    "iPadOS: 4.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.7.0 -",
    "tvOS: 9.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AVFoundation",
  "identifier" : "/documentation/AVFoundation/AVAssetImageGenerator/videoComposition",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "AVFoundation"
    ],
    "preciseIdentifier" : "c:objc(cs)AVAssetImageGenerator(py)videoComposition"
  },
  "title" : "videoComposition"
}
-->

# videoComposition

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

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

## 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`](/documentation/AVFoundation/AVAssetImageGenerator/appliesPreferredTrackTransform) property.

Setting a video composition with any of the following attributes generates an exception:

- A [`renderScale`](/documentation/AVFoundation/AVVideoComposition/renderScale) not equal to `1.0`.
- A [`renderSize`](/documentation/AVFoundation/AVVideoComposition/renderSize) with a width or height less than `0`.
- A [`frameDuration`](/documentation/AVFoundation/AVVideoComposition/frameDuration) that’s invalid, or less than or equal to <doc://com.apple.documentation/documentation/CoreMedia/CMTime/zero>.
- A [`sourceTrackIDForFrameTiming`](/documentation/AVFoundation/AVVideoComposition/sourceTrackIDForFrameTiming) less than <doc://com.apple.documentation/documentation/CoreMedia/CMTime/zero>.

---

Copyright &copy; 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)