title: Setting mp3 bitrate with xuggler
body: <p>I need to convert audio files to <code>mp3</code> format with a 192 kbps bitrate using xuggler.</p>
  
  <p>The method <code>addAudioStream</code>, which implements the <code>IWriter</code> interface, is writing the audio files at 64 kbps.</p>
  
  <p>How can I set the bit rate?</p>