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Reducing Switching Latency

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Reducing Switching Latency

The WMS Network Data Source plug-in does not allow the server to cue up a stream from a network source such as an encoder or a distribution server. Therefore, switching latencies occur when the server uses this plug-in and switches between streams in either of the two following cases.

  • The server switches from an on-demand source to a network source that is directly referenced in the playlist. 

    <?wsx version="1.0"?>
<smil>
<media src="c:\wmpub\wmroot\Ad_1.wmv"/>
<media src="https://encoder_1:8080"/>
</smil>

  • The server switches from one network source to another, and both sources are directly referenced in the playlist. 

    <?wsx version="1.0"?>
<smil>
<media src = "https://encoder_1:8080" dur = "5min"/>
<media src = "https://encoder_2:8080" dur = "5min"/>
</smil>

To reduce switching latency, you can associate each network source with a running broadcast publishing point. For example, if you create a publishing point named LiveSource, set its path to https://encoder_1:8080, and start it, the following playlist will switch seamlessly between the live feed from the publishing point and an on-demand stream.

<?wsx version="1.0"?>
<smil>
    <media src="c:\wmpub\wmroot\Ad_1.wmv" dur="5min"/>
    <media src="lpp://LiveSource" dur="5min"/>
</smil>
  • Note   In the preceding example, the lpp scheme type identifies a local publishing point named LiveSource. The encoder that is providing the live feed is not directly referenced. You must start the publishing point before your playlist can switch to it.

See Also

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