---
title: backwardFlow
framework: videotoolbox
role: symbol
role_heading: Instance Property
path: videotoolbox/vtframeprocessoropticalflow/backwardflow
---

# backwardFlow

The backward optical flow pixel buffer that was provided when the object was created.

## Declaration

```swift
var backwardFlow: CVPixelBuffer { get }
```

## See Also

### Inspecting the configuration

- [forwardFlow](videotoolbox/vtframeprocessoropticalflow/forwardflow.md)