title: RPScreenRecorder startCaptureWithHandler: not returning microphone sound in sample handler
body: <p>I am trying to use RPScreenRecorder startCaptureWithHandler:completionHandler: api on my iPad with iOS 11.4 to grab audio and video directly. It works well with the app screen, app audio and the camera, but when I turn on the microphone using microphoneEnabled = YES, I never get any audio sample for the mic in the callback.</p>
  
  <p>I added the microphone privacy usage key in the info.plist but that did not help.</p>
  
  <p>I am not sure what I can do next to try to resolve this issue.</p>
  
  <p>Thanks.</p>