---
title: AVVideoCleanApertureKey
framework: avfoundation
role: symbol
role_heading: Global Variable
path: avfoundation/avvideocleanaperturekey
---

# AVVideoCleanApertureKey

A key that defines the region within the video dimension displayed during playback.

## Declaration

```swift
let AVVideoCleanApertureKey: String
```

## Discussion

Discussion The value for this key is an instance of NSDictionary containing one or more of the following keys: AVVideoCleanApertureWidthKey, AVVideoCleanApertureHeightKey, AVVideoCleanApertureHorizontalOffsetKey, or AVVideoCleanApertureVerticalOffsetKey. If no clean aperture region is specified, the playback displays the entire frame.

## See Also

### Clean aperture

- [AVVideoCleanApertureWidthKey](avfoundation/avvideocleanaperturewidthkey.md)
- [AVVideoCleanApertureHeightKey](avfoundation/avvideocleanapertureheightkey.md)
- [AVVideoCleanApertureVerticalOffsetKey](avfoundation/avvideocleanapertureverticaloffsetkey.md)
- [AVVideoCleanApertureHorizontalOffsetKey](avfoundation/avvideocleanaperturehorizontaloffsetkey.md)