Audiokit: RecorderDemo example error: exportAsynchronously(ios)

[masaldana2]

Hello,
I run the original example of RecorderDemo and It compiles with only one error for exportAsynchronously:

Export Failed Optional(Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSLocalizedFailureReason=An unknown error occurred (-12936), NSLocalizedDescription=The operation could not be completed, NSURL=/Users/miguelsaldana/Library/Developer/CoreSimulator/Devices/79E361A8-8DA9-4E2B-8264-0ED34E1EFCB7/data/Containers/Data/Application/BD8F35B0-2A75-4046-95CC-BF30709C52D3/tmp/DBAE1838-D059-422D-B66B-23454350F109.caf, NSUnderlyingError=0x60000024ebe0 {Error Domain=NSOSStatusErrorDomain Code=-12936 "(null)"}})

anyone got a solution?
It does work with .wav to m4a but I want to convert .caf to .m4a :)
Thank you

[aure]

I don't have a solution, but thanks for making the issue. Will keep it open until it can be addressed.

[tomw]

I have this too, in my own project and in that example. I can't seem to record and export, which is a pretty fundamental problem. Any workarounds until this is fixed?

[masaldana2]

I used AVAssetExportSession and make my own converter.
its easy couple lines.

[aure]

@masaldana2 Care to share your code?

[masaldana2]

yes, im sorry im still a noob getting around github
here

`
func convertAudiotoM4A(name:String, cafURL: URL) -> URL{
let url = NSURL.fileURL(withPath: cafURL.absoluteString)

    let audioURL = AVURLAsset(url: url)


    let exported = AVAssetExportSession(asset: audioURL, presetName: AVAssetExportPresetAppleM4A)
    exported?.outputFileType = AVFileTypeAppleM4A

    let cacheDir = NSTemporaryDirectory()
    let filePath:String = cacheDir + name + ".m4a"
    print(filePath)

    //delete prev recording m4a if there's already one
    let fileManager = FileManager.default
    do{
        try? fileManager.removeItem(atPath: filePath)
    }catch{
        print("couldnt delete old caf")
    }


    exported?.outputURL = NSURL(fileURLWithPath: filePath) as URL

    exported?.exportAsynchronously(completionHandler: {

        if exported?.error != nil{
            print(exported?.error)
        }else{
            print("success creating m4a")



        }


    })
   return NSURL(fileURLWithPath: filePath) as URL
}

`

[tomw]

I still get the same error after adding some code similar to that. It must be something wrong with the input in some way...

[masaldana2]

i did this before calling the func

`

    var fileURL:URL = (self.conductor.recorder.audioFile?.url)!

    //rename file http://www.techotopia.com/index.php/Working_with_Files_in_Swift_on_iOS_8
    let filemgr = FileManager.default
    var fileNewURL = String(describing: fileURL.deletingLastPathComponent()).appending((recordingName?.text)! + ".caf")

    //clear prev file
    let fileManager = FileManager.default
    do{
        try? fileManager.removeItem(atPath: fileNewURL)
    }catch{
        print("couldnt delete old caf")
    }

    do {
        try filemgr.copyItem(atPath: fileURL.absoluteString, toPath: fileNewURL)
        print("Copy successful")
    } catch let error {
        print("Error: \(error.localizedDescription)")

`

[tomw]

That looks like it's just copying the file, which I don't think would help with this error. I'm wondering if there's something wrong with the way the .caf file is created @aure

[tomw]

@aure, the usual export function appears to work fine with doing the following to create the audio file (with a .caf extension):

let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 44100, channels: 2, interleaved: false)
let audioFile = try AKAudioFile(forWriting: recordingUrl, settings: format.settings)

None of the copying or using AVAssetExportSession directly is needed in that case. Although I appear to have no effects in my recording, but I suspect that's a different problem.

[CharlesSieg]

I had the same issue as @masaldana2 above. Typical non-helpful error message from AVFoundation, specifically the -12936 code.

His solution is correct also. Line 390 of AKAudioFile+ProcessingAsynchronously.swift:

internalExportSession.outputURL = URL(fileURLWithPath: filePath)

should probably be replaced with

internalExportSession.outputURL = NSURL(fileURLWithPath: filePath) as URL

This issue is reproducible In the Recorder demo. This export call below will generate the error with -12396 code:

player?.audioFile.exportAsynchronously(name: "TempTestFile.m4a", baseDir: .documents, exportFormat: .m4a) {_, error in if error != nil { print("Export Failed \(error)") } else { print("Export succeeded") }

This can be fixed without modifying the AudioKit code directly by calling the function @masaldana2 designed above. See attached file.

convertAudioToM4A.txt

[tomw]

@CharlesSieg Line 390 is correct in Swift 3. The NS has been dropped (e.g. you have FileManager not NSFileManager in your code)

Yeah that code looks like it should work. I did something similar and got a different error, but I'll try again at some point. For now it's recording fine anyway with my other change, but I'm stuck with #749.

[EriFisher]

For me the code didn't work in the recorder example and I got the same error, but I just replaced it with this......... Mozel Tov!

let fileName = player?.audioFile.url.lastPathComponent

                do {

                    let nonExistentFile = try AKAudioFile(readFileName: fileName!,

                                                          baseDir: .temp)

                    try  nonExistentFile.exportAsynchronously(name: "exported.m4a", baseDir: .documents, exportFormat: .m4a) { exportedFile, error in

                        print("myExportCallBack has been triggered. It means that export ended")

                        if error == nil {

                            print("Export succeeded")

                        }

                        else {

                            print("Export failed\(error)")

                        }



                    }

                } catch let error as NSError {

                    print("There's an error: \(error)")

                }

[aure]

So, a lot has been said on this thread and it seems like the original poster and a few others are satisfied. Should this be closed? Anything that should change in AudioKit as a result of this?

[tomw]

I think one of the solutions does need building in to AudioKit. The sample project for recording from the microphone doesn't work as is.

[aure]

Who wants to be a hero and make a pull request? I can even do a screen share with whoever if its your first time making a pull request.

[tomw]

@aure There you go, hopefully that'll be ok

[aure]

Fixed by https://github.com/audiokit/AudioKit/pull/756

[terenzeyuen]

Still seeing this issue.