The docs say "You may also override the default value by setting this property to a value between activeFormat.maxExposureDuration and activeFormat.minExposureDuration.". On the iPhone XS the maxExposureDuration is 1 sec. However, when setting activeMaxExposureDuration to e.g. 1s, 1/2s etc., the maximum exposure duration only changes from 1/17s to a maximum of 1/14s.
I am also setting activeVideoMaxFrameDuration to the same value.
Because it was mentioned in the docs, I also set AVCaptureDeviceInput's unifiedAutoExposureDefaultsEnabled property to YES, but that did not make a difference.
Exposure mode is continous auto-exposure.
Is there anything else that needs to be taken into consideration?