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# VTOpticalFlowParameters

An object that describes frame-level optical flow parameters.

```
class VTOpticalFlowParameters
```

## Topics

### Creating a parameters object

[`-  initWithSourceFrame:nextFrame:submissionMode:destinationOpticalFlow:`](/documentation/VideoToolbox/VTOpticalFlowParameters/init(sourceFrame:nextFrame:submissionMode:destinationOpticalFlow:))

### Inspecting the parameters

[`sourceFrame`](/documentation/VideoToolbox/VTOpticalFlowParameters/sourceFrame)

The current source frame.

[`nextFrame`](/documentation/VideoToolbox/VTOpticalFlowParameters/nextFrame)

The next source frame in presentation time order.

[`destinationOpticalFlow`](/documentation/VideoToolbox/VTOpticalFlowParameters/destinationOpticalFlow)

A user allocated mutable optical flow that will receive the results.

[`submissionMode`](/documentation/VideoToolbox/VTOpticalFlowParameters/submissionMode-swift.property)

A value describing the processing request in a parameters submission object.

[`SubmissionMode`](/documentation/VideoToolbox/VTOpticalFlowParameters/SubmissionMode-swift.enum)

A value describing the processing request in a parameters submission object.

## Relationships

### Conforms To

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`VTFrameProcessorParameters`](/documentation/VideoToolbox/VTFrameProcessorParameters)

[`CVarArg`](/documentation/Swift/CVarArg)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Hashable`](/documentation/Swift/Hashable)

[`Equatable`](/documentation/Swift/Equatable)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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