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Thread: Bad Strobe Playback performance nDVR Adaptive bitrate

  1. #1
    Join Date
    May 2012
    Posts
    2

    Default Bad Strobe Playback performance nDVR Adaptive bitrate

    Hi there,

    I am experiencing a strange difference between nDVR playback with HLS and HDS during live broadcast. The HLS DVR stream works fine. The HDS stream is stuttering / having small hickups every few seconds. The player is not buffering but you see that 'a movement' in the image is shortly interupted/freezes.

    I play the HDS DVR stream with StrobeMediaPlayback_1.6.328. I adjusted the buffer settings as discussed here: http://www.wowza.com/forums/content.php?392#recOSMF.

    Source Swf: file://localhost/Users/bauke/Downloads/StrobeMediaPlayback_1.6.328-full/Debug%20build%20for%20Flash%20Player%2010.1/StrobeMediaPlayback.swf
    width: 470 height: 320
    src: http://cdn.videodock.com:1935/mediac...nifest.f4m?DVR
    expandedBufferTime: 2
    dvrBufferTime: 5
    dvrDynamicStreamingBufferTime: 6
    liveBufferTime: 5
    liveDynamicStreamingBufferTime: 6

    I have C1.Large server in AWS ( with the standard startup package) that is doing transcoding from a 5 Mbit H264 5.1 MAIN that is live encoded with FMLE 3.2 and a keyframe interval of 2 seconds. The transcoder is configured to follow source keyframes and audio stream is passthrough. The server is doing 55% cpu.

    I configured c1.medium edges in the same region. I've tried with and without mediacache, but I do not see a difference there.

    I do not see anything in the error logs besides these lines every minute or so:

    On origin:
    DvrLiveRepeaterPlayer.play[live/_definst_/dvrstream_all.smil] : No playable DVR store:null

    On Edge:
    LiveMediaStreamReceiver.doWatchdog: streamTimeout: Resetting connection

    In the access logs on the edge there is:

    2012-06-27 09:16:34 UTC destroy stream INFO 200 rtmp://livestream.videodock.com:1935/live/_definst_/dvrstream_all.smil - _defaultVHost_ dvredge _definst_ 1075.09 46.137.121.83 1935 http://46.137.121.83:1935/dvredge/sm...ylist.m3u8?DVR 92.254.21.107 http (cupertino) - AppleCoreMedia/1.0.0.9B206 (iPad; U; CPU OS 5_1_1 like Mac OS X; nl_nl) 587742996 0 319614514 17 0 0 318145632 dvrstream_all.smil DVR - - - - http://46.137.121.83:1935/dvredge/sm...ylist.m3u8?DVR http://46.137.121.83:1935/dvredge/sm.../playlist.m3u8 DVR http://46.137.121.83:1935/dvredge/sm.../playlist.m3u8 DVR
    2012-06-27 09:16:34 UTC disconnect cupertino INFO 200 587742996 - _defaultVHost_ dvredge _definst_ 2981.799 46.137.121.83 1935 http://46.137.121.83:1935/dvredge/sm...ylist.m3u8?DVR 92.254.21.107 http (cupertino) - AppleCoreMedia/1.0.0.9B206 (iPad; U; CPU OS 5_1_1 like Mac OS X; nl_nl) 587742996 0 319614514 - 0 - - dvrstream_all.smil DVR - - - - http://46.137.121.83:1935/dvredge/sm...ylist.m3u8?DVR http://46.137.121.83:1935/dvredge/sm.../playlist.m3u8 DVR http://46.137.121.83:1935/dvredge/sm.../playlist.m3u8 DVR
    2012-06-27 09:16:38 UTC comment server WARN 200 - LiveMediaStreamReceiver.doWatchdog: streamTimeout: Resetting connection - - - 4743.524 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:16:38 UTC comment server INFO 200 - LiveMediaStreamReceiver.resetConnection: (SOCKET, R: livestream.videodock.com/46.137.177.149:1935, L: /10.227.186.127:49840, S: livestream.videodock.com/46.137.177.149:1935) - - - 4743.525 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:16:38 UTC comment server INFO 200 - LiveMediaStreamReceiver.sessionClosed: - - - 4743.526 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:16:38 UTC comment server INFO 200 - LiveMediaStreamReceiver.sessionClosed: reconnect: isCurrentSession:false tryConnect:true - - - 4743.526 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:16:51 UTC comment server WARN 200 - LiveMediaStreamReceiver.doWatchdog: streamTimeout: Resetting connection - - - 4756.037 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:16:51 UTC comment server INFO 200 - LiveMediaStreamReceiver.resetConnection: (SOCKET, R: livestream.videodock.com/46.137.177.149:1935, L: /10.227.186.127:49841, S: livestream.videodock.com/46.137.177.149:1935) - - - 4756.037 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:16:51 UTC comment server INFO 200 - LiveMediaStreamReceiver.sessionClosed: - - - 4756.038 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:16:51 UTC comment server INFO 200 - LiveMediaStreamReceiver.sessionClosed: reconnect: isCurrentSession:false tryConnect:true - - - 4756.038 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:17:00 UTC comment server INFO 200 - LiveMediaStreamReceiver.shutdown: [Lcom.wowza.wms.mediacaster.wowza.LiveMediaStreamURL;@6adda258 - - - 4765.045 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:17:00 UTC comment server INFO 200 - LiveMediaStreamReceiver.disconnect: (SOCKET, R: livestream.videodock.com/46.137.177.149:1935, L: /10.227.186.127:49842, S: livestream.videodock.com/46.137.177.149:1935) - - - 4765.045 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:17:00 UTC comment server INFO 200 - LiveMediaStreamReceiver.sessionClosed: - - - 4765.045 - - - - - - - - - - - - - - - - - - - - - - - - -
    2012-06-27 09:17:00 UTC destroy stream INFO 200 [dvrstreamingpacketizer|dvrstreamingrepeater]rtmp://livestream.videodock.com:1935/live/_definst_/dvrstream_all.smil - - - - 1685.68 - - - - - - - - - - 15 - 0 0 [dvrstreamingpacketizer|dvrstreamingrepeater]rtmp://livestream.videodock.com:1935/live/_definst_/dvrstream_all.smil - - - - - /[dvrstreamingpacketizer|dvrstreamingrepeater]rtmp://livestream.videodock.com:1935/live/_definst_/dvrstream_all.smil /[dvrstreamingpacketizer|dvrstreamingrepeater]rtmp://livestream.videodock.com:1935/live/_definst_/dvrstream_all.smil - - -
    2012-06-27 09:17:00 UTC comment server INFO 200 - LiveMediaStreamReceiver.sessionClosed: reconnect: isCurrentSession:false tryConnect:false - - - 4765.046 - - - - - - - - - - - - - - - - - - - - - - - - -


    What can be the source of this problem. Any help would be appreciated.

    Best,
    Bauke

  2. #2
    Join Date
    May 2011
    Posts
    456

    Default

    What version of Wowza Server are you running? There was a recent fix in 3.1.2 related to Flash HDS streaming. You can download the patch from here to upgrade from 3.0.x to 3.1.2. Releases notes are here.

    Is your origin and edge(s) each on a different server?

    -Lisa

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