[SOLVED] Openhab Docker or not?

Hey, my openhab 3 is running in a docker container (managed by portainer). Now I wanted to use the ip camera binding where I need to install FFmpeg. I installed it on the rpi via “sudo apt install ffmpeg” but it seems not to work… I am not sure, but maybe the problem is that ffmpeg was installed outside the docket and not inside the oh3 docker? I am right? Sorry, I am not the specialist here…