ffmpeg -y -f lavfi -i "color=c=gray:s=1920x1080:d=300:r=25,format=rgba,\
drawbox=x=0:y=0:w=50:h=50:[email protected]:t=fill,\
drawbox=x=200:y=100:w=50:h=50:[email protected]:t=fill,\
drawbox=x=350:y=200:w=50:h=50:[email protected]:t=fill,\
drawbox=x=580:y=300:w=50:h=50:[email protected]:t=fill,\
drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf:\
text='F\: %{frame_num} T\: %{eif\:t\:d.2}s':\
x=(w-tw)/2:y=h-th-50:fontsize=40:fontcolor=white:\
box=1:[email protected]:boxborderw=5" \
-c:v libx264 -preset medium -pix_fmt yuv420p test_checksum_video.mp4