2gif.bat

set filelink=%1
set filecolor=%1.png
ffmpeg -i %filelink% -r 24 -vf fps=24,scale=240:-1:flags=lanczos,palettegen -y %filecolor% && ffmpeg -v warning -i %filelink% -i %filecolor% -r 4 -lavfi fps=24,scale=240:-1:flags=lanczos[x];[x][1:v]paletteuse -y %filelink%.gif && del /F /S /Q %filecolor%
exit

README.md

参考

• http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html
• https://www.jianshu.com/p/11b6c4eb9e49