Similar to this this question,
I am having issues and my app is crashing in the same way. I would assume the same answer as on the other question: memory issue; except I am getting the crash during an AVAssetExportSession call.
guard let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality) else { return } exporter.outputFileType = AVFileTypeMPEG4 exporter.outputURL = url exporter.videoComposition = mainComposition print("done") exporter.exportAsynchronously(completionHandler: { DispatchQueue.main.async(execute: { self.exportDidFinish(exporter) print("removing AI") self.removeAI() print("removed AI") completion() }) }) func exportDidFinish(_ exporter:AVAssetExportSession) { if(exporter.status == AVAssetExportSessionStatus.completed) { print("cool") } else if(exporter.status == AVAssetExportSessionStatus.failed) { print(exporter.error as Any) } } It prints "done" but it never prints "removing AI". It also doesn't print "cool" or "(error)"; it crashes and says at the top of XCode "Lost connection to iPhone..." just as the other question states.
I would assume it is a memory issue, but there is nothing happening in between (to my knowledge of how this works) during the asynchronous exporting as I am just waiting for the completion handler to be called. But nothing gets called in between and I am unsure how to handle this. Any thoughts?
2 Answers
Answers 1
I think that AVAssetExportSession object may be deallocated while running async task. Consider put it as a class variable to make sure that async block can finish it's task. It will be something like:
class myClass { var exporter: AVAssetExportSession? func export() { exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality) guard exporter != nil else { return } exporter.outputFileType = AVFileTypeMPEG4 exporter.outputURL = url exporter.videoComposition = mainComposition print("done") exporter?.exportAsynchronously(completionHandler: { DispatchQueue.main.async { self.exportDidFinish(exporter) print("removing AI") self.removeAI() print("removed AI") completion() } } } } I'm really not sure why you also put everything on a main thread in completion block, but maybe you want to do something with UI later, so I leave it there.
But most import is - make your AVAssetExportSession not stored on method that may dealloc it. It's a memory issue that could cause this.
Answers 2
I had this issue before, it wasn't a memory issue for me. I don't know how exactly I got resolved, but I these are the things I did:
I deleted the app, hard reset the phone, cleaned build on Xcode, restarted Xcode, deleted derived data, and if I remember correctly changed the USB port until it got fixed.
I also had console and a VM open, I closed them as well.
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