AUTHOR: Debbie Newman(debbien@microsoft.com)
  VERSION: 01/31/2001, v1
  MODULE: MediaClipping Module
  FEATURE: clipEnd
  FILE NAME: media_clipEnd_repeatDur.smil
  MEDIA COMPONENTS: videos/coffee.mpg (natural duration is 10.83 seconds)
  0-2 seconds: nothing
  2-7 seconds: the video plays from the beginning of the video
  7-12 seconds: the video repeats
  12-15 seconds: the video repeats partially.
  at 15 seconds: the video ends and is removed
<smil xmlns="http://www.w3.org/2001/SMIL20/Language">
      <root-layout width="640" height="480" backgroundColor="white"/>
      <region id="reg1" top="0px" left="0px"/>
  <body >
    <video region="reg1" src="../videos/coffee.mpg" clipEnd="5s" repeatDur="00:00:13" begin="2" />