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Thread: Reduce nDvr latency for live play back

  1. #1
    Join Date
    Jan 2011
    Posts
    18

    Default Reduce nDvr latency for live play back

    Hello,

    When I watch my live video being played using nDvr, the live feed is about 15 - 20 seconds behind what is really happening. Is there a way I can change this so it is only 5 -10 seconds behind? I realize there are settings in the player for dvr buffering but the majority of the delay is the way I have the ndvr config set up (I believe). My use case is sporting events so it's more important to have quick rewind in short intervals rather than being able to go back several hours to rewind a live feed.

    My dvr settings are:
    <DVR>
    	<Recorders>dvrrecorder</Recorders>
    	<Store>dvrfilestorage</Store>
    	<WindowDuration>600</WindowDuration>
    	<StorageDir>${com.wowza.wms.context.VHostConfigHome}/dvr</StorageDir>
    	<ArchiveStrategy>delete</ArchiveStrategy>
    	<Repeater>
    			ChunkOriginURL></ChunkOriginURL>
    	</Repeater>
    	<Properties>
    	</Properties>
    </DVR>
    Thanks,

    Greg

  2. #2
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    There are some general suggestions here:

    http://www.wowza.com/forums/content....re-to-playback

    nDVR is going to add latency.

    Richard

  3. #3

    Default

    nDVR uses HTTP streaming which by its nature has several chunks worth of latency. The nDVR chunking is based on video keyframe interval, so you can reduce nDVR latency by reducing the keyframe interval of the incoming stream.

    This will increase the number of chunks in a [playlist, which will increase playlist/manifest length as well as increase the number of chunk requests to the server. So its a trade-off.

    Scott

  4. #4
    Join Date
    Jan 2011
    Posts
    18

    Default

    Thanks Richard and Scott. I was able to make some minor improvements to the nDVR latency given your suggestions above.

    Greg

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