/usr/bin/ffmpeg -i ori.mp4 -y -i 1.png -i 2.png -filter_complex "[0:v][1:v]overlay=20:20[bkg];[bkg][2:v]overlay=(main_w-overlay_w)-20:(main_h-overlay_h)-20" -codec:v libx264 -crf 18 -preset slow -pix_fmt yuv420p -c:a aac -strict -2 out.mp4