ffmpeg -ss 6 -i clip.mp4 -ignore_loop 0 -i b.gif -filter_complex "[0:v]crop=in_w-2*28:in_h-2*25[base];[base][1:v]overlay=15:H-h-25:shortest=1" -codec:v libx264 out.mp4

ffmpeg -i main.mp4 -vf "movie=bg.mp4:loop=200,hue=s=0[bg];[in]setpts=PTS/2,scale=iw/2:-1,pad=iw+20:ih+20:10:10:color=yellow[m];