How do you track when a VNVideoProcessor analysis is finished?

Question

Created Jan ’22

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I'm adopting and transitioning to VNVideoProcessor away from performing Vision requests on individual frames, since it more concisely does the same. However, I'm not sure how to detect when analysis of a video is finished. Previously when reading frames with AVFoundation I could check with

             // Get the next sample from the asset reader output.
            guard let sampleBuffer = readerOutput.copyNextSampleBuffer() else {
                // The asset reader output has no more samples to vend.
                isDone = true
                break
            }

What would be an equivalent when using VNVideoProcessor?

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Answer 1

Curiosity OP

Jan ’22

Oh I see, analyze(_:) returns when the video is finished processing.

0

	// Get the next sample from the asset reader output.
	guard let sampleBuffer = readerOutput.copyNextSampleBuffer() else {
	// The asset reader output has no more samples to vend.
	isDone = true
	break
	}