Thank you for your answers!
I have tested all agents and documents modes, everytime the same result -> black screen/no video
But I have found a way to show the picture: The camera is accessed via a dyndns. If I run the camera by the dyndns-address (e.g. camera32.dyndns.org) I get the error shown in the picture (black screen and blinking connecting text).
Now I have used the directly IPv6 address then I'll be redirected to the URL camera32.dyndns.org/index_mjpg.html instead of index.html
Why?
index_mjpg.html works and on the right side I can select:
Stream 1 - Snapshot
Stream 2 - MJPEG (disabled and I can't activate it)
Stream 3 - Snapshot
And below that: *Non-Internet Explorer(IE) Browser cannot display H.264 and MPEG4 video stream.
Is that right?