I didn't have any stock Dahua models, but I just got hold of a Dahua 8MP Zoom camera ( DH-IPC-HFW4631H-ZSA, running firmware "2.460.0000000.16.R, Build Date: 2017-09-04") and tested it out in my setup. It turns out that:
The Dahua, with original Dahua firmware, works somewhat better, in that it...