Add ffmpeg dependency to Debian packages

debian/control

@@ -12,6 +12,6 @@ Replaces: mediabrowser, emby, emby-server-beta, jellyfin-dev, emby-server
 Breaks: mediabrowser, emby, emby-server-beta, jellyfin-dev, emby-server
 Conflicts: mediabrowser, emby, emby-server-beta, jellyfin-dev, emby-server
 Architecture: all
-Depends: ${shlibs:Depends}, ${misc:Depends}, at, libsqlite3-0, dotnet-runtime-2.1
+Depends: ${shlibs:Depends}, ${misc:Depends}, at, libsqlite3-0, dotnet-runtime-2.1, ffmpeg
 Description: Jellyfin is a home media server.
  It is built on top of other popular open source technologies such as Service Stack, jQuery, jQuery mobile, and Mono. It features a REST-based api with built-in documentation to facilitate client development. We also have client libraries for our api to enable rapid development.