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The Advanced Stream Redirector (ASX) format is a type of XML metafile designed to store a playlist of Windows Media files for a multimedia presentation.

It is used frequently on streaming video servers where multiple ASF files are to be played in succession. Both RTSP and MMS streaming protocols are supported, as well as HTTP.

ASX files have MIME type video/x-ms-asf (as do ASF files).

With the introduction of the WMA and WMV container formats in late 1990s, WAX and WVX extensions have also been introduced by Microsoft respectively.

<asx version="3.0">
  <title>Example.com Live Stream</title>
 
  <entry>
    <title>Short Announcement to Play Before Main Stream</title>
    <ref href="http://example.com/announcement.wma" />
    <param name="aParameterName" value="aParameterValue" />
  </entry>
   
  <entry>
    <title>Example radio</title>
    <ref href="http://example.com:8080" />
    <author>Example.com</author>
    <copyright>Copyright © 2005 Example.com</copyright>
  </entry>
</asx>

ASX can be used to print playlists done with Windows Media Player. To print a playlist, there are two main steps for those people that are familiar with Windows command lines and XSLT:

• Install an XSLT processor
• Export the playlist from the Windows Media Player with: Menu File -> Save current playlist

Other playlist file formats

• M3U – The most common playlist format
• PLS – SHOUTcast
• XSPF – Xiph.Org Foundation
• WPL – Windows Media Player

• MS Docs Simple ASX, 2020
• MS Docs ASX Elements Reference, 2020
• MS Docs Adding Windows Media to Web Pages (For Webmasters), 2020
• Creating Customized Web Experiences with Windows Media Player 9 Series
• A survey of playlist formats, 2003
• RTL Live Stream
• http://edutechwiki.unige.ch/en/Advanced_Stream_Redirector

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