1. Generate palette

ffmpeg -y -i quad-landing.mp4 \
-vf "fps=10,scale=960:-1:flags=lanczos,palettegen" \
-frames:v 1 palette.png

2. Generate gif from palette

ffmpeg -i quad-landing.mp4 -i palette.png \
-filter_complex "fps=10,scale=960:-1:flags=lanczos,paletteuse=dither=bayer" \
output.gif