Hi, we have studied your video-audio sync problem, and the following suggestions might help.
1. For the desktop screen recorder:
Try to enable accessible mode and use “Performance Priority” mode to do the recording. To know how to enable the accessible mode, please go to “Settings” -> “Options” -> “Recording” -> “Advanced video settings”, then you can check the “Enable accessible mode” box and select “Performance Priority”.
Or you can use the built-in Video Editor to adjust the audio sync after recording. To do it, you just need to right-click and open the video in video editor, then click “Edit” -> “Adjust”, then adjust the synchronize.
2. For the online screen recorder:
You can go to the settings and click “Recording”. After that, you can change the “Balance” mode in “Video settings” to “Performance Priority” before recording.