---
title: kVTCompressionPropertyKey_FieldCount
framework: videotoolbox
role: symbol
role_heading: Global Variable
path: videotoolbox/kvtcompressionpropertykey_fieldcount
---

# kVTCompressionPropertyKey_FieldCount

The field count indicating whether the frames should be encoded progressive (1) or interlaced (2).

## Declaration

```swift
let kVTCompressionPropertyKey_FieldCount: CFString
```

## Discussion

Discussion The field count is set on the format description for output samples, and may affect source frame scaling. NULL is a valid value for this property.

## See Also

### Clean Aperture and Pixel Aspect Ratio

- [kVTCompressionPropertyKey_AspectRatio16x9](videotoolbox/kvtcompressionpropertykey_aspectratio16x9.md)
- [kVTCompressionPropertyKey_CleanAperture](videotoolbox/kvtcompressionpropertykey_cleanaperture.md)
- [kVTCompressionPropertyKey_FieldDetail](videotoolbox/kvtcompressionpropertykey_fielddetail.md)
- [kVTCompressionPropertyKey_PixelAspectRatio](videotoolbox/kvtcompressionpropertykey_pixelaspectratio.md)
- [kVTCompressionPropertyKey_ProgressiveScan](videotoolbox/kvtcompressionpropertykey_progressivescan.md)