XBMC external video player setting

playercorefactory.xml

<playercorefactory>
 <players>
   <player name="mplayer-vaapi" type="ExternalPlayer" audio="false" video="true">
     <filename>/home/user/launch_mplayer.py</filename>
     <args>"$PPID" "{1}"</args>
     <hidexbmc>false</hidexbmc>
     <hideconsole>false</hideconsole>
     <warpcursor>none</warpcursor>
   </player>
 </players>
 <rules action="prepend">
   <rule video="true" player="mplayer-vaapi"/>
 </rules>
</playercorefactory>

you might need to set <hidexbmc>true</hidexbmc> if XBMC ends on top of mplayer