ffmpeg\
        -thread_queue_size 32\
        -threads 1\
        -i udp://239.168.100.1:5000?fifo_size=1000000\
        -i udp://239.168.100.2:5000?fifo_size=1000000\
        -i udp://239.168.100.4:5000?fifo_size=1000000\
        -filter_complex "
                nullsrc=size=720x576[canvas0];[0:v][0:s]overlay[out0v];[canvas0][out0v]overlay=x=8[out0];
                nullsrc=size=720x576[canvas1];[1:v][1:s]overlay[out1v];[canvas1][out1v]overlay=x=8[out1];
                nullsrc=size=720x576[canvas2];[2:v][2:s]overlay[out2v];[canvas2][out2v]overlay=x=8[out2];
                [out0][out1][out2] hstack=inputs=3[strip1];
                [strip1]scale=w=iw/2:h=ih/2[final]
        "\
        -threads 1\
        -map [final]\
        -y\
        -c:v rawvideo -f /tmp/fifo1