I'm using an AMX signage system with an high level editor which generates XML code. I wish to insert timed bursts of video streams, e.g. Sky news live. My problem is to display the stream only when the stream is at the start of its two minute approx repeat sequence. Currently it displays the stream at random points in the clip. The stream is referenced in an ASX file,

Code:
<ASX version="3.0">
<ENTRY>
<REF HREF="mms://live1.wm.skynews.servecast.net/skynews_wmlz_live300k" />
</ENTRY>
</ASX>
This file in turn is referenced in an .SVG file shown at the end of this post. The last line is the reference to the ASX file with parameters to control how long to play (repeatDur), how often to repeat (repeatCount), InitialDisplay to overlay only when the stream is buffered and displayable etc. Is there any code arguement to add to the ASX file or any parameter to add the the SVG file which would achieve this. Would the MMS stream contain some type of marker to flag its start.

Code:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Generator: AMX InspiredSignage XPress -->
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" dur="media" height="100%" viewBox="0 0 1280 720" viewport-fill="black" width="100%" xml:id="svg">
 <spx:properties xmlns:spx="http://www.spinetix.com/namespace/1.0/spx">
  <spx:text name="Title" xlink:href="#title"/>
  <spx:text name="Description" xlink:href="#desc"/>
  <spx:choice choice-1="indefinite" choice-2="media" name="Duration" targetAttribute="dur" xlink:href="#svg"/>
  <spx:color name="Background Color" targetAttribute="viewport-fill" xlink:href="#svg"/>
  <spx:table defaultPage="yes" itemElement="g" name="Layers" tableElement="g" xlink:href="#layers">
   <spx:media xmlns:svg="http://www.w3.org/2000/svg" element="g" layer="locked" name="Layers" positionable="yes" svg:display-align="center" svg:font-family="Arial" svg:font-size="58.000000" svg:height="360" svg:preserveAspectRatio="xMidYMid" svg:repeatDur="indefinite" svg:text-align="center" svg:transform="translate(320,180)" svg:width="640" xml:id="media_1"/>
  </spx:table>
  <spx:group name="Document">
   <spx:text name="Canvas Size" targetAttribute="viewBox" xlink:href="#svg"/>
  </spx:group>
  <spx:group name="New Layer">
   <spx:text name="Default Width" targetAttribute="width" targetNamespace="http://www.w3.org/2000/svg" xlink:href="#media_1"/>
   <spx:text name="Default Height" targetAttribute="height" targetNamespace="http://www.w3.org/2000/svg" xlink:href="#media_1"/>
   <spx:text name="Default Position" targetAttribute="transform" targetNamespace="http://www.w3.org/2000/svg" xlink:href="#media_1"/>
   <spx:choice choice-01="none" choice-02="xMidYMid" name="Default Aspect Ratio" targetAttribute="svg:preserveAspectRatio" xlink:href="#media_1"/>
  </spx:group>
 </spx:properties>
 <title xml:id="title">New document 16:9
</title>
 <desc xml:id="desc">Multilayer 16:9 Template
</desc>
 <g xml:id="layers">
  <g>
   <g xml:id="id47980">
    <video xmlns:spx="http://www.spinetix.com/namespace/1.0/spx" xmlns:xlink="http://www.w3.org/1999/xlink" begin="0s" display-align="center" dur="" fill="remove" font-family="Arial" font-size="58.000000" height="720.0000" initialVisibility="whenStarted" preserveAspectRatio="xMidYMid" repeatCount="1.0000" repeatDur="60s" spx:preview-href=".preview.Sky%20News.asx.png" text-align="center" transform="matrix(1.0000, 0.0000, 0.0000, 1.0000, 0.0000, 0.0000)" width="1280.0000" xlink:href="Sky%20News.asx" xml:id="id68027"/>
   </g>
  </g>
 </g>
</svg>