title: AVAudioRecorder recording m4a files that are very large
body: <p>I'm using AVAudioRecorder and recording m4a files but the files are 14mb for one second. If I were do record an hour the file size would be massive. Is there anyway to reduce the file size?</p>
  
  <pre><code>        var recordSettings = [
          AVFormatIDKey: kAudioFormatAppleLossless,
          AVEncoderAudioQualityKey : AVAudioQuality.Medium.rawValue,
          AVEncoderBitRateKey : 320000,
          AVNumberOfChannelsKey: 2,
          AVSampleRateKey : 44100.0
      ]
  </code></pre>