playercorefactory.xml

<playercorefactory>
  <players>
    <player name="mplayer2" type="ExternalPlayer" audio="false" video="true">
      <filename>/usr/bin/mplayer</filename>
      <hidexbmc>true</hidexbmc>
    </player>
  </players>
  <rules action="prepend">
    <rule filetypes="mkv" filename=".*(\[Coalgirls\]|\[Commie\]|10bit|hi10p).*" player="mplayer2"/>
  </rules>
</playercorefactory>