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# processFrame(fromImageBuffer:completionHandler:)

Requests the processor to process a video frame.

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

## 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

The completionHandler block must be called for every [`processFrame(fromImageBuffer:completionHandler:)`](/documentation/MediaExtension/MERAWProcessor/processFrame(fromImageBuffer:completionHandler:)) call when processing is complete. The completion handler block should return either a processed pixel buffer or an error.

---

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