Install ffmpgeg within docker container - sudo password

3

It is also possible to execute a script to install it before openHAB is started as explained in the documentation.

Adding a /etc/cont-init.d/20-install-ffmpeg script like this might work:

#!/bin/bash

if ! which ffmpeg >/dev/null; then
    echo "Installing ffmpeg"
    apt-get update
    apt-get install -y ffmpeg
else
    echo "ffmpeg is already installed"
fi
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