---
title: revision
framework: videotoolbox
role: symbol
role_heading: Instance Property
path: videotoolbox/vtopticalflowconfiguration/revision-swift.property
---

# revision

The specific algorithm or configuration revision that is to be used to perform the request.

## Declaration

```swift
var revision: VTOpticalFlowConfiguration.Revision { get }
```

## See Also

### Inspecting revision information

- [defaultRevision](videotoolbox/vtopticalflowconfiguration/defaultrevision.md)
- [supportedRevisions](videotoolbox/vtopticalflowconfiguration/supportedrevisions.md)
- [VTOpticalFlowConfiguration.Revision](videotoolbox/vtopticalflowconfiguration/revision-swift.enum.md)