Flutter Agora startRecording() with RecorderStreamType.preview return error code -3

[DuyNguoiLinh]

Version of the agora_rtc_engine

6.3.2

Platforms affected

• Android
• iOS
• macOS
• Windows
• Web

Steps to reproduce

1. I want to record the local video stream from Agora, including audio, and save it to the device's gallery. However, I don't want to use Agora's Cloud Recording feature. Thanks in advance!
2. I have used createMediaRecorder function with type is RecorderStreamType.Preview and startRecording with streamType is streamTypeBoth

Expected results

I want to record both video and audio and save the recording to the gallery

Actual results

I have successfully saved the video to the gallery, but it does not include audio.

Code sample

Code sample

 Future<void> startMediaRecording() async {
    _mediaRecorder ??= await _engine.createMediaRecorder(
        const RecorderStreamInfo(type: RecorderStreamType.preview));

    await _mediaRecorder?.setMediaRecorderObserver(MediaRecorderObserver(
      onRecorderStateChanged: (String channelId, int uid, RecorderState state,
          RecorderReasonCode error) {
        print(
            'onRecorderStateChanged channelId: $channelId, uid: $uid state: $state, error: $error');
      },
      onRecorderInfoUpdated: (String channelId, int uid, RecorderInfo info) {
        file = info.fileName ?? '';
        if (file.isNotEmpty) {
          GallerySaver.saveVideo(file).then((value) {
            print("done");
          });}

        print(
            'onRecorderInfoUpdated channelId: $channelId, uid: $uid, info: ${info
                .toJson()}');
      },
    ));

    Directory appDocDir = Platform.isAndroid
        ? (await getExternalStorageDirectory())!
        : await getApplicationDocumentsDirectory();

    String p = path.join(appDocDir.path, '${DateTime
        .now()
        .microsecondsSinceEpoch}.mp4');
    await _mediaRecorder
        ?.startRecording(MediaRecorderConfiguration(storagePath: p,
        streamType: MediaRecorderStreamType.streamTypeBoth,
        containerFormat: MediaRecorderContainerFormat.formatMp4,
    ));

    _recordingFileStoragePath = p;
    _isStartedMediaRecording = true;
  }

Screenshots or Video

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[DuyNguoiLinh]

I met error at startRecoding function in MediaRecoderImpl class