---
title: sourceFrame
framework: videotoolbox
role: symbol
role_heading: Instance Property
path: videotoolbox/vtframerateconversionparameters/sourceframe
---

# sourceFrame

The current source frame.

## Declaration

```swift
var sourceFrame: VTFrameProcessorFrame { get }
```

## Discussion

Discussion This value must be non-nil.

## See Also

### Inspecting the parameters

- [nextFrame](videotoolbox/vtframerateconversionparameters/nextframe.md)
- [opticalFlow](videotoolbox/vtframerateconversionparameters/opticalflow.md)
- [interpolationPhase](videotoolbox/vtframerateconversionparameters/interpolationphase-2jky5.md)
- [submissionMode](videotoolbox/vtframerateconversionparameters/submissionmode-swift.property.md)
- [VTFrameRateConversionParameters.SubmissionMode](videotoolbox/vtframerateconversionparameters/submissionmode-swift.enum.md)