Finally got it working: The command should be:

_{Edit waltervl: made link readable}

I have a DVR connected now and i see no additional accounts as far as i can see. I am able to get a still image from the DVR via the same command but only for the first attached camera. If i change the channel to 2 or higher it still gives me only channel 1 (and without supplying a password!!).

I searched for the Onvif Device Manager but for MAC there is no installable. When i download the MAC version all i get is a directory with a bunch off DLL's (looks more like the Windows version)...

Yep, tried that. Same result unfortunately.

In my case just from a HTML-page. <img class="thumbnail-image" id="barn-Cam" src="http://<ip-address>/webcapture.jpg?command=snap&amp;channel=1" alt=""></img> The strange thing is that this works for several days, so even without a username or password. But after a week or so it stops. And if i do ...

I saw someone posting these command for getting a picture from a cheap chinese camera (with Onvif). http://ip/webcapture.jpg?command=snap&channel=0 http://ip/webcapture.jpg?command=snap&channel=1 This works but...... After several days it stops working. It states that the username/password have been ...