So I\'m using an AVAudioRecorder to record audio alongside an AVCaptureSession that is recording video (I know this is odd, but for my situation I need to record them sepera
I had this same problem - and the answer proved to be related to AVAudioSession. I needed to set the audio session category to PlayAndRecord. Other parts of my application were setting it to Ambient. This post https://stackoverflow.com/a/10287793/1009125 gave me the answer. Hope this helps someone, I lost a Sunday to this one.