Hi,
i have some unbranded chinese cameras with a MStar MC400L board inside (i even did a couple of firmware updates).
What's the best way to configure them in BlueIris ? With generic onvif i don't get the audio.
Given that it's an "off brand" camera I think you're going to end up having to try to find one on your own. You could try searching the board for the camera and see if there are any other threads about it. That best done from the address bar of your bowser, "site:ipcamtalk.com MC400L" for example but don't use the quotation marks.
I got Blue Iris to work with my EZVIZ doorbell camera including the audio.
You could try the different audio formats in the menu, but "RTSP alternate AAC decoder" worked for my doorbell camera.