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To ensure flawless operation of Serviio, additional codecs and libraries must be installed not available in current Debian distribution. The packages containing the additional codecs and libraries can be installed from http://deb-multimedia.org.
For instructions how to install packages from http://deb-multimedia.org follow the the next steps.
Create a file /etc/apt/sources.list.d/deb-multimedia.list and add one of the following lines according to your distribution:
testing
deb http://www.deb-multimedia.org testing main non-free
or
deb ftp://ftp.deb-multimedia.org testing main non-free
unstable
deb http://www.deb-multimedia.org unstablemain non-free
or
deb ftp://ftp.deb-multimedia.org unstablemain non-free
Next update your list of packages
apt-get update
and in first place install the deb-multimedia-keyring
apt-get install deb-multimedia-keyring
sudo apt-get install ffmpeg