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Thread: Video and Audio out of sync.

  1. #1
    Join Date
    Mar 2010
    Posts
    9

    Default Video and Audio out of sync.

    Hi ,

    I have a delay between video and audio when I try to playback a live stream on IOS devices. The delay is about 2-3 seconds.

    I tried, without succes, to apply the changes on thoses threads :

    http://www.wowza.com/forums/content....reaming-issues

    http://www.wowza.com/forums/content....ters-%28iOS%29

    http://www.wowza.com/forums/showthre...M-%28tuning%29

    [install-dir]/bin/setenv.sh (Linux, Mac OSX and Solaris)

    JAVA_OPTS="-Xmx3000M"

    [install-dir]/bin/setenv.bat (Windows)

    set JAVA_OPTS=-Xmx3000M

    [install-dir]/bin/WowzaMediaServer-Service.conf (Windows)

    wrapper.java.additional.1=-Xmx3000M

    I tested with two different versions 3.0.3 and 2.2.0 .

    The encoder details are :

    Video format : H.264 Baseline Level 3.0, and ékeyframe frequency 2secondes.

    Audio Format : AAC Stereo 44100 bitrate 40Kbps.

    Do you have any suggestion or solution to fix that issue.

    Regards.

    Mahmoud

  2. #2
    Join Date
    Jun 2011
    Posts
    1,037

    Default

    Would you provide more information regarding your encoder, the type of encoding you are doing, and if possible sample encoded stream and HLS stream. Please also provide zipped versions of conf/ and logs/ folders. Send all to support@wowza.com and reference this post.

    best regards,
    - Daren

  3. #3
    Join Date
    Nov 2011
    Posts
    1

    Default

    I have the same issue. I'm using 3.0 and have tuned the server. On my iPad with a wifi connection, audio and video get farther and farther out of sync as the live stream plays. After 2 or 3 minutes, audio will be behind video approximately 3 to 4 seconds. Over my LAN, flash audio and video are in sync just fine. On my Android smartphone (Motorola Bionic) with a 4G connection, flash audio and video are out of sync about 15 frames, but the gap doesn't appear to increase no matter how long the stream plays. I'm using a Newtek Tricaster to push the stream to our in-house server, and network speed isn't an issue (80mbps+ wired, 20mbps+ wireless). Right now, the Tricaster is pushing an RTMP stream at 15fps, 240x180, 288kbps H.264. Thanks for any help.

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

    Default

    This is usually an encoder issue. You can use this Property setting to see audio/video alignment in the logs:

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

    Richard

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