For using open source transcoding with VIMP you have to install the necessary transcoding tools (MPlayer, mencoder, FFmpeg, etc).
Debian uses the packet manager "apt" to install software. We first have to add the needed sources (repositories):
(we recommend using "joe" to edit the file)
touch /etc/apt/sources.list.d/deb-multimedia.org.list joe /etc/apt/sources.list.d/deb-multimedia.org.list
We add the following lines to the file debian-multimedia.org.list:
# Debian Multimedia Repository
deb http://www.deb-multimedia.org jessie main non-free
deb ftp://ftp.deb-multimedia.org jessie main non-free
Then save the file (with joe, ctrl-k->ctrl-x) and install the keyring for the previously added repositories (if asked, enter "Y"):
apt-get update
apt-get install deb-multimedia-keyring
apt-get update
apt-get install libimage-exiftool-perl ffmpeg
apt-get install libimage-exiftool-perl
apt-get install mplayer mencoder
VIMP >=2.7 can use the included presets. If you use an older version, don´t forget to copy the FFmpeg presets to /usr/share/ffmpeg. You can download the presets here.
Note: Since VIMP 3.1.3 "Open Source HD transcoding" has been added to all VIMP editions. flvtool2 is not needed anymore.