/usr/local/ffmpeg/bin/ffmpeg -y -t 60 -i 10.mp4 -i tupian1.png -i tupian2.png
-filter_complex "overlay=x=if(lt(mod(t\,20)\,10)\,10\,NAN ):y=10,overlay=x=if(gt(mod(t\,20)\,10)\,W-w-10\,NAN ) :y=10" overlay.flv