When the Docker container is started, the command of the process is created by inspecting the Entrypoint and the Cmd metadata fields of the image. If you build the images will all defaults and you run

docker image inspect --format='{{.Config.Entrypoint}} - {{.Config.Cmd}}' coremedia/cae-live

You will get a response like this:

[./entrypoint.sh] - [application]

This is the entrypoint script chain that will be processed at startup.