---
title: kCVImageBufferFieldDetailTemporalBottomFirst
framework: corevideo
role: symbol
role_heading: Global Variable
path: corevideo/kcvimagebufferfielddetailtemporalbottomfirst
---

# kCVImageBufferFieldDetailTemporalBottomFirst

A key to the temporal bottom first detail field of the image buffer.

## Declaration

```swift
let kCVImageBufferFieldDetailTemporalBottomFirst: CFString
```

## Discussion

Discussion The temporal bottom first detail field value is of type CFString. The image buffer contains complete fields in alternating order. The bottom, even-numbered, fields contain image data captured at an earlier time than top, odd-numbered, fields.

## See Also

### Constants

- [kCVImageBufferFieldDetailTemporalTopFirst](corevideo/kcvimagebufferfielddetailtemporaltopfirst.md)
- [kCVImageBufferFieldDetailSpatialFirstLineEarly](corevideo/kcvimagebufferfielddetailspatialfirstlineearly.md)
- [kCVImageBufferFieldDetailSpatialFirstLineLate](corevideo/kcvimagebufferfielddetailspatialfirstlinelate.md)