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Hi, dimskyI got the same error and finally fixed it.The detail of error is:[00:02:09.377] MovieHeaderMakerCopyMovieHeaderAsBlockBuffer signalled err=-16345 (kMovieHeaderMakerError_InvalidFileExtension) (file format and file extension of destination URL doesn't match) at /BuildRoot/Library/Caches/com.apple.xbs/Sources/EmbeddedCoreMedia/EmbeddedCoreMedia-2479.1.3/Prototypes/FormatHandlers/Movie/MovieHeaderMaker.c:1463PS. I found the error info from Console.app with iOS 13 beta device log.So the solution is obvious:* Check AVFileType, which was set to AVAssetWriter, make sure it matches destinationURL extension. e.g. AVFileType.mp4 should match the file extension ".mp4".I tried AVFileType.mov with ".mp4" file extension on iOS 12, it worked fine. But it failed on iOS 13.Hope this help 🙂