---
title: "init(sourceFrame:nextFrame:submissionMode:destinationOpticalFlow:)"
framework: videotoolbox
role: symbol
role_heading: Initializer
path: "videotoolbox/vtopticalflowparameters/init(sourceframe:nextframe:submissionmode:destinationopticalflow:)"
---

# init(sourceFrame:nextFrame:submissionMode:destinationOpticalFlow:)

## Declaration

```swift
init?(sourceFrame: VTFrameProcessorFrame, nextFrame: VTFrameProcessorFrame, submissionMode: VTOpticalFlowParameters.SubmissionMode, destinationOpticalFlow: VTFrameProcessorOpticalFlow)
```

## Parameters

- `sourceFrame`: The current source frame. This must be a non-nil value.
- `nextFrame`: The next source frame in presentation time order. This value can be set to nil for the last frame.
- `submissionMode`: A value describing the processing request in a parameters submission object.
- `destinationOpticalFlow`: A user allocated mutable optical flow that will receive the results.