title: MediaCodec KEY_FRAME_RATE seems to be ignored
body: <p>I am trying to modify the source for screenrecord in android 4.4 and lower the captured frame rate, but no matter what value I put in: </p>
  
  <pre><code>format-&gt;setFloat("frame-rate", 5);
  </code></pre>
  
  <p>the result is always the same ( a very high frame rate ) </p>
  
  <p>Is the encoder ignoring this property ? 
  how can I control the frame rate ?</p>