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I'm trying to use the sample code associated to the talk Author fragmented MPEG-4 content with AVAssetWriter which can be found here. It works well when I run it on macOS, but after adapting it to run in iOS (basically moving the code in the main file to a view controller), it doesn't work. The problem is that the function: assetWriter(_:didOutputSegmentData:segmentType:segmentReport:) is never called for the last segment. In macOS, the last segment is reported after calling the function AVAssetWriter.finishWriting(completionHandler:), but before the completionHandler parameter block is invoked. In iOS, nothing happens at that point. Is there anything I could do from my side to fix this problem? Thanks in advance!