tce-load -i compiletc meson gst-plugins-base-dev ffmpeg-dev

https://gstreamer.freedesktop.org/src/gst-libav/gst-libav-1.16.2.tar.xz

cd gst-libav-1.16.2

mkdir build
cd build

CC="gcc -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe" CXX="g++ -march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -Os -pipe -fno-exceptions -fno-rtti" meson --prefix=/usr/local --localstatedir=/var --libexecdir=/usr/local/lib --buildtype=plain ../

[-fno-exceptions -fno-rtti fails]

ninja [0m 6.04s]
sudo ninja install