My problem was, that I cannot use ffmpeg camera and motion sensor at the same time.
So I searched the web and tried motion (apt-get install…edit conf but no luck) and others. But for whatever reason it didnt work…
At the end I configured my Hassbian like here: Rasbperry Pi - FFmpeg Install and Stream to Web and:
camera:
- platform: ffmpeg
name: wallpanel
input: http://192.168.2.31:8090/test.mjpg
binary_sensor:
- platform: ffmpeg_motion
name: wallpanel_motion
input: http://192.168.2.31:8090/test.mjpg
…perhaps someone has the same problem