note: this is probably not a good idea if any of the media need transcoding.
another note: was able to install the open source verion of Emby called JellyFin, using Docker: https://hub.docker.com/r/jellyfin/jellyfin
https://www.mono-project.com/download/stable/#download-lin-debian
sudo apt install apt-transport-https dirmngr
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb https://download.mono-project.com/repo/debian stable-stretch main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update
sudo apt install mono-devel
https://software.opensuse.org/download.html?project=home%3Aemby&package=emby-server
sudo su
echo 'deb http://download.opensuse.org/repositories/home:/emby/Debian_9.0/ /' > /etc/apt/sources.list.d/home:emby.list
apt-get update
apt-get install emby-server
but this ended with failure:
The following packages have unmet dependencies:
emby-server : Depends: libembysqlite3-0 but it is not installable
Depends: embymagick but it is not installable
E: Unable to correct problems, you have held broken packages.
From https://hub.docker.com/r/emby/embyserver/
As root:
$ curl -sSL https://get.docker.com/ | sh
$ docker pull emby/embyserver:latest
and follwing the instructions ends in failure: standard_init_linux.go:190: exec user process caused "exec format error"
never got this to work. removed docker. trying out Plex.