ffmpeg -i 快乐大本营test0616.mp4  -filter_complex "nullsrc=s=1280x720,drawbox=x=50:y=50:w=200:h=200:color=#ffffff:t=fill:enable='between(t,0,100)'[mask],[0:v][mask]alphamerge,avgblur=sizeX=15:sizeY=15:enable='between(t,0,100)'[blur],[0:v][blur]overlay=enable='between(t,0,100)'" -s 1920x1080 -y -pix_fmt yuv420p -movflags faststart -c:v libx264 -preset ultrafast -r 25.000000 -x264opts force-cfr:scenecut=40 -crf 15 -y -sn -acodec aac -strict -2 -ac 2 -ar 48000 -ab 384k -cutoff 20000 -y output1.mp4

nullsrc=s=1280x720 这里的分辨率是指的输入文件的分辨率