---
title: kVTCompressionPropertyKey_AspectRatio16x9
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtcompressionpropertykey_aspectratio16x9
---

# kVTCompressionPropertyKey_AspectRatio16x9

A Boolean value indicating whether the DV video stream should have the 16x9 flag set.

## Declaration

```swift
let kVTCompressionPropertyKey_AspectRatio16x9: CFString
```

## Discussion

Discussion This property is supported by the DV25/50 family of encoders. When false, the picture aspect ratio is 4:3. When true, the picture aspect ratio is 16:9. Either way, a fixed aspect ratio is used (the specific value depends on whether the format is NTSC or PAL).

## See Also

### Clean Aperture and Pixel Aspect Ratio

- [kVTCompressionPropertyKey_CleanAperture](videotoolbox/kvtcompressionpropertykey_cleanaperture.md)
- [kVTCompressionPropertyKey_FieldCount](videotoolbox/kvtcompressionpropertykey_fieldcount.md)
- [kVTCompressionPropertyKey_FieldDetail](videotoolbox/kvtcompressionpropertykey_fielddetail.md)
- [kVTCompressionPropertyKey_PixelAspectRatio](videotoolbox/kvtcompressionpropertykey_pixelaspectratio.md)
- [kVTCompressionPropertyKey_ProgressiveScan](videotoolbox/kvtcompressionpropertykey_progressivescan.md)