how to sync audio and video in playbin3

[cfd new]

It is not solved. decondebin in playbin has a default 2 second latency. How to set it to 0?
    On Tuesday, August 22, 2023, 09:39:05 a.m. EDT, cfd new <newcfd at yahoo.com> wrote:  
 
 the problem is solved by setting sync of sink to true. But its default value is true. Weird.
   On Monday, August 21, 2023, 06:35:41 p.m. EDT, cfd new via gstreamer-devel <gstreamer-devel at lists.freedesktop.org> wrote:  
 
 I use playbin3 to display rtsp streaming and noticed audio is slightly behind video in the display. How to sync audio and video? Thanks for your kind help.
   Joe
    
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