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I have a video conferencing app and we are setting up AVAudioSession to videoChat so that we can get echo cancellation.

let options: AVAudioSession.CategoryOptions = [.mixWithOthers , .defaultToSpeaker, .allowBluetooth]
try session.setCategory(.playAndRecord, mode: .videoChat, options: options)

I also want to do local recording of audio samples using AVAssetWriter API. Setup of AssertWriter is as follows:

let audioAssetWriter = try AVAssetWriter(outputURL: fileURL, fileType: .m4a)
     
let settings: [String: Any] = [
AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
AVSampleRateKey: Int(audioParameters.samplingRate),
AVEncoderBitRateKey: Int(audioParameters.bitrate),
AVNumberOfChannelsKey: Int(audioParameters.channels),
AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue
]
       
let assetWriterAudioInput = AVAssetWriterInput(mediaType: .audio, outputSettings: settings)
assetWriterAudioInput.expectsMediaDataInRealTime = true
audioAssetWriter.add(assetWriterAudioInput)

I am seeing that on the iPhone 14 Pro,

assetWriterAudioInput.append()

is failing. Everything works fine on iPhone 13 and older devices.

Is anyone else seeing this issue on the iPhone 14 Pro.

Adeel Abbas
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  • Are you sure the `AVAssetWriterInput` `outputSettings` match the sample buffers you're appending? `AVAssetWriter.status` and `AVAssetWriter.error` should tell you something when append fails. What do they say? – Rhythmic Fistman Dec 01 '22 at 07:46
  • I also tried calling `AVCaptureAudioDataOutput.recommendedAudioSettingsForAssetWriter(writingTo: .m4a)` to get recommended settings and then feed those to the `AVAssetWriterInput` constructor - but that did not help – Adeel Abbas Dec 01 '22 at 19:37
  • AVAssetWriter.status is .failed AVAssetWriter.error code is -11800 (operation could not be completed) – Adeel Abbas Dec 01 '22 at 19:38
  • Was there any other text in that log? `-11800 = AVErrorUnknown` is the "outer" error. It usually wraps an "inner" error. – Rhythmic Fistman Dec 02 '22 at 17:22

0 Answers0