title: vlc-android: Audio filter audio normalization (normvol) is not working
body: <p>When trying to normalize the audio(mov file) using vlc-android, it seems to not work. Below is the command which was added to options:|</p>
  
  <p>options.add("--audio-filter=normvol") options.add("--norm-buff-size=20") options.add("--norm-max-level=4")</p>
  
  <p>After using the same we were not able to notice any difference. Some other filters also does not seem to work. </p>
  
  <p>Git link: <a href="https://github.com/videolan/vlc-android" rel="nofollow noreferrer">https://github.com/videolan/vlc-android</a>
  Usage link: <a href="https://wiki.videolan.org/Documentation:Advanced_Use_of_VLC/" rel="nofollow noreferrer">https://wiki.videolan.org/Documentation:Advanced_Use_of_VLC/</a></p>
  
  <p>Let us know in case we are missing something here. The above mentioned commands seems to work in the linux environment.</p>
  
  <p>Any help would be greatly appreciated</p>