New Server/Web Hotfix Release: 10.8.13

[I-G-1-1]

... with this version, you are now unable to edit the FFmpeg binary path in the Jellyfin WebUI. This has been done for security reasons ...

can you please explain how to edit the FFmpeg path using the command line in Debian? 
I don't find any file containing jellyfin configuration in any of these directory: "/var/lib/jellyfin/" "/etc/jellyfin"
I found these lines in the file "/etc/default/jellyfin":

Code:

# ffmpeg binary paths, overriding the system values
JELLYFIN_FFMPEG_OPT="--ffmpeg=/usr/lib/jellyfin-ffmpeg/ffmpeg"

but it's not the path that my jellyfin installation is using at the moment.
any help would be appreciated, thanks