---
title: "processFrame(fromImageBuffer:completionHandler:)"
framework: MediaExtension
role: symbol
role_heading: Instance Method
platforms: [macOS 15.0+]
path: "mediaextension/merawprocessor/processframe(fromimagebuffer:completionhandler:)"
---

# processFrame(fromImageBuffer:completionHandler:)

Requests the processor to process a video frame.

## Declaration

```swift
func processFrame(fromImageBuffer inputFrame: CVPixelBuffer, completionHandler: @escaping @Sendable (CVPixelBuffer?, (any Error)?) -> Void)
```

```swift
func processFrame(fromImageBuffer inputFrame: CVPixelBuffer) async throws -> CVPixelBuffer
```

## Parameters

- `inputFrame`: A CVPixelBuffer that contains a video frame to process.
- `completionHandler`: The handler is invoked when a frame processes and is ready to be sent back to the caller. This block does not need to be called in the order in which frames were submitted.

## Discussion

Discussion The completionHandler block must be called for every processFrame(fromImageBuffer:completionHandler:) call when processing is complete. The completion handler block should return either a processed pixel buffer or an error.