Audio video sync

Hello
I am using OBS for recording A/V via blackmagic design 4K through HDMI connexion
everything works fine , I got .MP4 file I can play on VLC
but even if I use -950 ms for audio sync I am still out of sync
so what is the way to increase this -950ms value which is the maximum
Thanks for help
currently I have to use Magix pro for resync
 
Top