#too much cpu
ffmpeg -fflags +genpts -f image2 -loop 1 -i /opt/config/background.png \
        -c:v rawvideo \
        -pix_fmt yuv420p \
        -f matroska \
        tcp://localhost:16000

# does one loop and starts spewing stuff aboiut wrong dts
ffmpeg -fflags +genpts -f lavfi i movie:/opt/config/bg.mkv:loop=0 \
        -c:v copy \
        -pix_fmt yuv420p \
        -f matroska \
        tcp://localhost:16000