Android: creating file but not recording

[haideraltahan]

Version of flutter_sound

1.2.4

flutter doctor

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.14.1 18B75, locale en-CA)
[✓] Android toolchain - develop for Android devices (Android SDK 28.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
[✓] Android Studio (version 3.2)
[✓] Connected device (1 available)
• No issues found!

Platforms you faced the error (IOS or Android or both?)

Android

Expected behavior

Record audio and save to the file.

Actual behavior

When startRecorder is called with or without a fileName, the audio is not saved on the file.
That is the file size is always 8.65KB.

Tested environment (Emulator? Real Device?)

Emulator

[haideraltahan]

After further investigation. It does record but with very poor quality... 8kHz is the max frequency. How do I increase the quality?

[hyochan]

@haideraltahan Hi. I think you are talking about ios am I right? I've recently decreased the recorded file in ios because of #26. Currently, you should change the value AVAudioQualityMin in ios to AVAudioQualityMax because this variable isn't exposed to dart. See the line.

I would be happy if you can give a nice PR that also manages android side.

[haideraltahan]

I was talking about Android as it was very bad quality for my use case.
I solved it by using those settings:

this.model.setMediaRecorder(new MediaRecorder());
this.model.getMediaRecorder().setAudioSource(MediaRecorder.AudioSource.MIC);
this.model.getMediaRecorder().setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
this.model.getMediaRecorder().setAudioEncoder(MediaRecorder.AudioEncoder.AAC_ELD);
this.model.getMediaRecorder().setAudioEncodingBitRate(256000);
this.model.getMediaRecorder().setAudioChannels(numChannels);
this.model.getMediaRecorder().setAudioSamplingRate(sampleRate);
this.model.getMediaRecorder().setOutputFile(path);

[hyochan]

@haideraltahan Thanks for confirming. I hope you to give us PR for this if you'd like to share your work.

[mike-gallego]

@haideraltahan Did you ever resolve this issue? I tried setting those settings in my project but it seemed there was no effect. I even put encoding bit rate 0 and numChannels to 0 and nothing change; same result.

[haideraltahan]

@mikeyyg96 try transferring the recording and listening to them. The recording file size alone is not enough to see if it's working.