[Flutter] Flutter webRtc unable to Record audio only file

tried to develop audio calling app using flutter webrtc , the call are working well but, need record audio call only, currently flutter webrtc not support record audio call only, if any one know any other idea please share.

void _startRecordingN() async {
try {
if (_localStream == null) throw Exception('Stream is not initialized');
if (Platform.isIOS) {
print('Recording is not available on iOS');
return;
}
// TODO(rostopira): request write storage permission
final storagePath = await getExternalStorageDirectory();
if (storagePath == null) throw Exception('Can\'t find storagePath');
final filePath = storagePath.path + '/webrtc_sample/test.mp3';
_mediaRecorder = MediaRecorder();
setState(() {});

//final videoTrack = _localStream!
// .getVideoTracks()
// .firstWhere((track) => track.kind == 'video');

await _mediaRecorder!.start(
filePath,
audioChannel: RecorderAudioChannel.INPUT,
//videoTrack: audioTrack,
);
} catch (e) {
print('exception::$e');
}
}


Error Log: E/MediaRecorderImpl( 5137): Video track is null D/FlutterWebRTCPlugin( 5137): startRecordToFile(): Audio-only recording not implemented yet I/flutter ( 5137): exception:latformException(startRecordToFile, startRecordToFile(): Audio-only recording not implemented yet, null, null)

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