Small GIFs with ffmpeg and bash

make-gif.sh

#!/usr/bin/env bash

function makeGIF {
    local input="$1"
    local framerate="$2"
    local width="$3"
    local basename="$4"
    local maxColors="$5"

    # GIFs of 60fps videos have to be 50fps
    if [[ $framerate == "60" ]]; then
        framerate=50
    fi

    if [[ $maxColors == "" ]]; then
        maxColors=256
    fi

    ffmpeg \
        -framerate $framerate \
        -i $input \
        -vf "fps=$framerate,scale=$width:-1:flags=lanczos,split[s0][s1];[s0]palettegen=max_colors=${maxColors}[p];[s1][p]paletteuse" \
        "$basename".gif
}