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Thread: Variable sound drift when playing MP4 in VOD application

  1. #1

    Question Variable sound drift when playing MP4 in VOD application

    I have a .mp4 file which reads perfectly with chrome's builtin player through http (including instant seeking).

    When I play it with vlc through rtmp, the sound is about 1 sec early. When I use wowza's builtin player, the sound is about 3 sec late (rtmp or hds).

    The file has been processed with MP4Box, and I also tested with qt-faststart.

    Is there a way to have the sound in sync when using wowza?

    TIA

    greg

  2. #2

    Default

    Hello Greg.

    Try adding the following property to the Streams/Properties in [install-dir]/conf/[application]/Application.xml (be sure to get the correct properties container - there are several in Application.xml):
    <Property>
            <Name>audioLag</Name>
            <Value>250</Value>
            <Type>Integer</Type>
    </Property>
    You can increase/decrease 250 as needed to get the audio synced up.

    I hope this helps.

    Kind regards,

    Salvadore

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