title: Tee output for avconv missing
body: <p>I have two installations of avconv on ubuntu 14.04 machines. 
  I believe they have both been installed from standard repositories. 
  However, on one of them I have the tee output, but on the other I dont:</p>
  
  <pre><code># avconv -formats|grep tee 
   avconv version 9.18-6:9.18-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the  Libav developers
   built on Mar 16 2015 13:19:10 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
   E tee             Multiple muxer tee
  </code></pre>
  
  <p>But on the other only this:</p>
  
  <pre><code># avconv -formats|grep -i tee
  avconv version 9.18-6:9.18-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers
    built on Mar 16 2015 13:19:10 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  # 
  </code></pre>
  
  <p>I cant find what packet I am missing ? Any advise on how to get tee into avconv of the other machine are appreciated!</p>