@Solla-topee
Thank you for your reponse. I know the RTSP stream of this camera and I also found out how to take a screenshot using ffmpeg. This works on a Raspberry Pi, for example. But in my case that is not a solution. I use a German smart home system called Homematic. Ffmpeg and RTSP do not work on the Homematic central device called CCU3.
I have 3 INSTAR cameras outside. These cameras can be accessed via the command: http://192.168.XXX.XXX/tmpfs/snap.jpg?usr=USER&pwd=PASSWORD
The CCU3 executes this command, for example when motion is detected outside, and can send me the image from the camera via pushover.
The command to save the image in the CCU3 is:
dom.GetObject ("CUxD.CUX2801001: 1.CMD_EXEC"). State ("wget -O /tmp/Door.jpg 'http://192.168.XXX.XXX/tmpfs/snap.jpg?usr=USER&pwd=PASSWORD' ");
In the German Homematic Forum there are many posts with problems with RTSP. We all need snapshots from the cameras !! :-)
Please tell your developers. PLEASE !!!