title: how to replace audio track in mkv file (on Ubuntu 11.10)
body: <p>I have</p>
  
  <ul>
  <li>a mkv file with webm video and ogg audio</li>
  <li>an ogg audio file</li>
  </ul>
  
  <p>I want to replace the audio in the mkv file with the audio from the ogg file.
  How can I do that on Ubuntu 11.10 with programs available from default repositories?</p>
  
  <p>The resulting file may also have another format (e.g. avi), but I would prefer mkv.
  Btw. doesn't ffmpeg have an mkv muxer? My test with param <em>-f mkv</em> resulted in error <em>Requested output format 'mkv' is not a suitable output format</em></p>