[frank74]

I tested it and yes, after about 1 minute i've the same problem. I stopped it several time and start it (from the beginning and in the middle of the clip) and after 30sec-1min i got the offset from about 1sec

I'm not seeing any sync problem with that file. It's been playing for 42 minutes and audio sync still seems good.
I have MMAL/omxplayer disabled. Otherwise audio settings are default (HDMI output, no passthrough, no pll).

Do you have any non-default settings? E.g. PLL adjustment?    

Hi
i think no. but the settings are about 3-4 month old and I can remember.

So i reset audio and video settings via the menu to default.... nothing changes

Then I start from zero (delete my profile etc)... the same... after 20-30sec i have a audio offset..  ok video ofsett will be better, because the audio hears good but i think that i will see that the video will stutter. but the offset is fixed 1 sec.

At the moment I configured an aufio offset from 1sec and saved it as default. so the first 20-30sec i have the problem and then it is ok.
The only special thing is my raspberry pi 3b+ configuration... it's network booting without an sd card. No changes at the rasppi settings.. overclocking etc)

Frank