先用quicktime錄制，再用ffmpeg轉(zhuǎn)成gif（質(zhì)量不好）

ffmpeg -ss 00:00:00.000 -i pngen.mov -pix_fmt pal8 -r 10 -s 800x600 -t 00:00:10.000 output.gif
http://superuser.com/questions/556029/how-do-i-convert-a-video-to-gif-using-ffmpeg-with-reasonable-quality

質(zhì)量好的：

ffmpeg -i input -vf scale=${width}:-1:flags=lanczos,fps=10 frames/ffout%03d.png

convert -loop 0 frames/ffout*.png output.gif