AUTHOR: Debbie Newman(debbien@microsoft.com)
  VERSION: 01/31/2001, v1
  MODULE: MediaClipping Module
  FEATURE: clipBegin
  FILE NAME: media_clipBegin_repeatCount.smil
  MEDIA COMPONENTS: videos/coffee.mpg (natural duration is 10.83 seconds)
  0-2 seconds: nothing
  2-7.8 seconds: the video plays with clipBegin = 5 seconds.
  7.8-13.7 seconds: the video plays again with the same clipBegin
  at 13.7 seconds: the video ends and is removed
<smil xmlns="http://www.w3.org/2005/SMIL21/Language">
      <root-layout width="640" height="480" backgroundColor="white"/>
      <region id="reg1" top="0px" left="0px"/>
  <body >
    <video region="reg1" src="../videos/coffee.mpg" clipBegin="5" repeatCount="2" begin="2" />