参考网站：
https://blog.csdn.net/harrison2010/article/details/107338579/
https://blog.csdn.net/weixin_33721427/article/details/94219057

高斯模糊：https://blog.csdn.net/yu540135101/article/details/109643028
绘制文字：https://blog.csdn.net/toopoo/article/details/105603154

合成指令：
./ffmpeg.exe -y -i “mubu.png” -i “test.mp4” -i “test1.png” -i “test2.png” -i “test3.png” -i “test4.png” -filter_complex “[1:v]scale=720:1280/3[v1];[0:v][v1]overlay=0:(H-h)/1[outv1];[2:v]scale=720:1280/3+1280/3/2[img1];[outv1][img1]overlay=0:(H-h)/2-((H-h)/6):enable=‘between(t,0,2)’[outv2];[3:v]scale=720:1280/3+1280/3/2[img2];[outv2][img2]overlay=0:(H-h)/2-((H-h)/6):enable=‘between(t,2,4)’[outv3];[4:v]scale=720:1280/3+1280/3/2[img3];[outv3][img3]overlay=0:(H-h)/2-((H-h)/6):enable=‘between(t,4,6)’[outv4];[5:v]scale=720:1280/3+1280/3/2[img4];[outv4][img4]overlay=0:(H-h)/2-((H-h)/6):enable=‘between(t,6,10)’[outv5];[1:v]crop=(ih/16*9):ih,scale=iw/10:-2,gblur=sigma=5,scale=720:1280/3/2[vbg];[outv5][vbg]overlay=0:1,drawtext=fontfile=‘msyhbd.ttc’:text=‘测试seeFM’:fontsize=60:fontcolor=white:shadowy=2:x=(w-text_w)/2:y=(1280/3/2-text_h)/2” 720x1280_single.mp4