Compile FFmpeg on the Odroid XU4 to get hardware acceleration

Originally published on November 28, 2019 at https://bruno.verachten.fr/2019/11/28/ffmpeg-for-xu4/ sudo apt-get build-dep ffmpeg sudo apt install debhelper libchromaprint-dev frei0r-plugins-dev libgnutls28-dev libx265-dev ladspa-sdk libaom-dev libserd-dev libsord-dev libsratom-dev libsndfile1-dev libiec61883-dev libavc1394-dev libavc1394-0 libass-dev libbluray-dev libbs2b-dev libcaca-dev mkdir ffmpeg_sources 36 cd ffmpeg_sources 37 wget http://deb.debian.org/debian/pool/main/f/ffmpeg/ffmpeg_4.1.