Variable sound drift when playing MP4 in VOD application

Wowza Streaming Engine
1

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

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