create gif

gif.cmd

ffmpeg -i a.mp4 -vf "fps=10,scale=1280:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif

normal
ffmpeg -i input.mov -r 10 -vf scale=640:-1 -f gif output.gif

mid
ffmpeg -i input.mov -filter_complex "[0:v] fps=10,scale=640:-1,split [a][b];[a] palettegen [p];[b][p] paletteuse" output-palette.gif

high
ffmpeg -i input.mov -filter_complex "[0:v] fps=10,scale=w=640:h=-1,split [a][b];[a] palettegen=stats_mode=single [p];[b][p] paletteuse=new=1" output-multiple-palette.gif