Hi MAG79! Thanks for your answer. I have added to mediasconfig.xml the following lines (and comment the old stuff concerning mkv out):
    <rule filetypes="mkv">
      <source filter="lavfsource" />
      <splitter filter="lavfsplitter" />
      <video filter="lavvideodec" />
      <audio filter="ffdaudiodec" />
      <extra>
        <extra filter="ac3filter" />
        <extra videoresolution="480|540|576|720|1080" filter="ffdraw" />
      </extra>
    </rule>
In filtersconfig.xml, I have added:
    <filter name="ffdraw" type="extra">
     <guid>{0B390488-D80F-4A68-8408-48DC199F0E97}</guid>
     <osdname>FFdshow RAW</osdname>
    </filter>
     <filter name="lavfsource" type="source">
     <path>LAVSplitter.ax</path>
     <guid>{B98D13E7-55DB-4385-A33D-09FD1BA26338}</guid>
     <osdname>LAV Splitter Source</osdname>
    </filter>
This does not work, SVP still does not recognize the video played. Funny thing is, all worked until I updated SVP.