Flumotion loop

    <component name="decoder"
               type="loop-producer"
               label="decoder"
               worker="localhost">
           <property name="location">/home/andoni/test.ogg</property>
      <property name="framerate">25/1</property>
      <property name="keyunits-interval">5000</property>
      <clock-master>false</clock-master>
     </component>

Found at http://lists.fluendo.com/pipermail/flumotion-commit/2011-September/008380.html
Docs http://www.flumotion.net/doc/flumotion/manual/en/trunk/html/component-loop-producer.html

What I'd try:
    <component name="producer-audio-video"
               type="loop-producer"
               label="decoder"
               worker="localhost">
           <property name="location">/home/andoni/test.ogg</property>
      <property name="framerate">25/1</property>
      <property name="height">576</property>
      <property name="width">792</property>
      <property name="keyunits-interval">5000</property>
      <clock-master>true</clock-master>
     </component>

This way you don't have to rename anything else, you do need an ogg video though.