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Thread: HLS nDVR stream will not sync for a long time playing

  1. #1
    Join Date
    Jan 2013
    Posts
    14

    Default HLS nDVR stream will not sync for a long time playing

    Hi:
    We found that when we use HDS(manifest.f4m) to play a nDVR stream(http://.../manifest.f4m?DVR) using flash object(OSMF), the video will stop for a second to wait the audio , and then synchronized.
    But when we play the same HLS nDVR stream(http://.../playlist.m3u8?DVR) for a long time(about 1 hour), the now-playing point is lag behind several minutes ago, not the live point, and the video and audio is not sync anymore. But HDS will not. And for the live stream(http://.../playlist.m3u8) will also not act so.
    What is the problem for this.
    The wowza version is 3.5.2

    Thank you.

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

    Default

    This is usually a problem with the live stream source. Some players are able to sync and some can't. You can debug audio timecodes in the source following this guide:

    http://www.wowza.com/forums/content....-packetization

    Richard

  3. #3
    Join Date
    Jan 2013
    Posts
    14

    Default

    Hi:
    I've debug audio timecodes. The result is as follows.
    The TC difference is 0 or 1, but the iOS safari is already out of sync.
    We've tried to set the key frame interval as 50, and 25fps, and set the cupertinoChunkDurationTarget as 10000.
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    tc[1]: 85517333:85517334:44100
    tc[1]: 85517333:85517334:44100
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    tc[0]: 85517775:85517775:44100
    Quote Originally Posted by rrlanham View Post
    This is usually a problem with the live stream source. Some players are able to sync and some can't. You can debug audio timecodes in the source following this guide:

    http://www.wowza.com/forums/content....-packetization

    Richard

  4. #4
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    scratched
    Last edited by rrlanham; 06-16-2013 at 05:23 PM.

  5. #5
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    Actually, scratch previous, for nDVR add dvrPacketSortTime Property in the Application.xml /DVR Properties container.

    <Properties>
         <Property>
              <Name>dvrPacketSortTime</Name>
              <Value>0</Value>
              <Type>Integer</Type>
         </Property>
    </Properties>
    More info in the DVR Advanced Configuration guide

    Richard

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