I got a second hand Synology DS916+. I am interested in installing Jellyfin on it with hardware transcoding support. I have read over the debacle of Synology removing the codecs support, but am confused whether this just impacts the Synology installed apps (Video Station, etc) or if it would also impact Jellyfin running in Docker.

Do I need to downgrade the DSM or try to install the codecs for hardware transcoding to work in Jellyfin?