I've scanned the DVR IP address and discovered that the usual RTSP port (554) was open. You can actually telnet to it, and it will prompt with the name and the pass.
Then, I went to the Dahua site and found that the URL should be like this:
rtsp://IPAddress:554/cam/realmonitor?channel=1&subtype=00&authbasic=YWRtaW46YWRtaW4=
(www.dahuasecurity.com/feedback_list.aspx?p=fwyxz&p_kind=4&c_kind=9&c_kind2=192&c_kind3=)
The only problem, as the message says, is that the login should be admin/admin.
I guess you can probably change the admin password, but I am not sure what the encryption algo is, perhaps MD5 (authbasic=). I could not experiment too long because as I said the DVR crashed twice while running the streaming RTSP video through VLC. I also managed to connect with Blue Iris, but I forgot to write down the way I passed the parameters -- it did work for about 5 min, in parallel with VLC. So, if the DVR would not crash, you could presumably configure it in Blue Iris the same way as you would the $600 Axis 241Q, as four separate IP cams, but for a lot cheaper.
Re. the Dahua 2.206 "General" firmware: is there the same 5 min interval cutoff for email delivery as in Q-See or you can pretty much disable the forced interval by setting it to zero as the manual alleges ?
