func errorAndCode(code: AVError.Code) -> (Int, String) {
    return (code.rawValue, describeAVError(code: code))
}

func describeAVError(code: AVError.Code) -> String {
    switch code {
    case .unknown: return "unknown"
    case .outOfMemory: return "outOfMemory"
    case .sessionNotRunning: return "sessionNotRunning"
    case .deviceAlreadyUsedByAnotherSession: return "deviceAlreadyUsedByAnotherSession"
    case .noDataCaptured: return "noDataCaptured"
    case .sessionConfigurationChanged: return "sessionConfigurationChanged"
    case .diskFull: return "diskFull"
    case .deviceWasDisconnected: return "deviceWasDisconnected"
    case .mediaChanged: return "mediaChanged"
    case .maximumDurationReached: return "maximumDurationReached"
    case .maximumFileSizeReached: return "maximumFileSizeReached"
    case .mediaDiscontinuity: return "mediaDiscontinuity"
    case .maximumNumberOfSamplesForFileFormatReached: return "maximumNumberOfSamplesForFileFormatReached"
    case .deviceNotConnected: return "deviceNotConnected"
    case .deviceInUseByAnotherApplication: return "deviceInUseByAnotherApplication"
    case .deviceLockedForConfigurationByAnotherProcess: return "deviceLockedForConfigurationByAnotherProcess"
    case .sessionWasInterrupted: return "sessionWasInterrupted"
    case .mediaServicesWereReset: return "mediaServicesWereReset"
    case .exportFailed: return "exportFailed"
    case .decodeFailed: return "decodeFailed" // userInfo may contain AVErrorMediaTypeKey, AVErrorMediaSubTypeKey & AVErrorPresentationTimeStampKey, if available
    case .invalidSourceMedia: return "invalidSourceMedia"
    case .fileAlreadyExists: return "fileAlreadyExists"
    case .compositionTrackSegmentsNotContiguous: return "compositionTrackSegmentsNotContiguous"
    case .invalidCompositionTrackSegmentDuration: return "invalidCompositionTrackSegmentDuration"
    case .invalidCompositionTrackSegmentSourceStartTime: return "invalidCompositionTrackSegmentSourceStartTime"
    case .invalidCompositionTrackSegmentSourceDuration: return "invalidCompositionTrackSegmentSourceDuration"
    case .fileFormatNotRecognized: return "fileFormatNotRecognized"
    case .fileFailedToParse: return "fileFailedToParse"
    case .maximumStillImageCaptureRequestsExceeded: return "maximumStillImageCaptureRequestsExceeded"
    case .contentIsProtected: return "contentIsProtected"
    case .noImageAtTime: return "noImageAtTime"
    case .decoderNotFound: return "decoderNotFound" // userInfo may contain AVErrorMediaTypeKey & AVErrorMediaSubTypeKey, if available
    case .encoderNotFound: return "encoderNotFound" // userInfo may contain AVErrorMediaTypeKey & AVErrorMediaSubTypeKey, if available
    case .contentIsNotAuthorized: return "contentIsNotAuthorized"
    case .applicationIsNotAuthorized: return "applicationIsNotAuthorized"
    case .operationNotSupportedForAsset: return "operationNotSupportedForAsset"
    case .decoderTemporarilyUnavailable: return "decoderTemporarilyUnavailable" // userInfo may contain AVErrorMediaTypeKey & AVErrorMediaSubTypeKey, if available
    case .encoderTemporarilyUnavailable: return "encoderTemporarilyUnavailable" // userInfo may contain AVErrorMediaTypeKey & AVErrorMediaSubTypeKey, if available
    case .invalidVideoComposition: return "invalidVideoComposition"
    case .referenceForbiddenByReferencePolicy: return "referenceForbiddenByReferencePolicy"
    case .invalidOutputURLPathExtension: return "invalidOutputURLPathExtension"
    case .screenCaptureFailed: return "screenCaptureFailed"
    case .displayWasDisabled: return "displayWasDisabled"
    case .torchLevelUnavailable: return "torchLevelUnavailable"
    case .operationInterrupted: return "operationInterrupted"
    case .incompatibleAsset: return "incompatibleAsset"
    case .failedToLoadMediaData: return "failedToLoadMediaData"
    case .serverIncorrectlyConfigured: return "serverIncorrectlyConfigured"
    case .applicationIsNotAuthorizedToUseDevice: return "applicationIsNotAuthorizedToUseDevice"
    case .failedToParse: return "failedToParse"
    case .fileTypeDoesNotSupportSampleReferences: return "fileTypeDoesNotSupportSampleReferences" // userInfo contains AVErrorFileTypeKey
    case .undecodableMediaData: return "undecodableMediaData"
    case .airPlayControllerRequiresInternet: return "airPlayControllerRequiresInternet"
    case .airPlayReceiverRequiresInternet: return "airPlayReceiverRequiresInternet"
    case .videoCompositorFailed: return "videoCompositorFailed"
    case .recordingAlreadyInProgress: return "recordingAlreadyInProgress" // on iOS, AVCaptureMovieFileOutput only supports one recording at a time

    default:
        if #available(iOS 11.2, *) {
            switch code {
            case .noSourceTrack: return "noSourceTrack"
            default: return "Unknown"
            }
        }
        else if #available(iOS 11.0, *) {
            switch code {
            case .contentIsUnavailable: return "contentIsUnavailable"
            case .formatUnsupported: return "formatUnsupported"
            case .malformedDepth: return "malformedDepth"
            case .contentNotUpdated: return "contentNotUpdated"
            case .noLongerPlayable: return "noLongerPlayable"
            case .noCompatibleAlternatesForExternalDisplay: return "noCompatibleAlternatesForExternalDisplay"
            default: return "Unknown"
            }
        }
        else if #available(iOS 10.0, *) {
            switch code {
            case .unsupportedOutputSettings: return "unsupportedOutputSettings"
            case .operationNotAllowed: return "operationNotAllowed"
            default: return "Unknown"
            }
        }
        return "Unknown"
    }
}