Bash script to create gif from vide with ffmpeg

gif.sh

#!/bin/sh

global_palette="/tmp/global_palette.png"

filters="fps=$5,scale=$6:-1:flags=lanczos"

ffmpeg -v error -ss $1 -t $2 -i $3 -vf "$filters,palettegen" -y $global_palette
ffmpeg -v error -ss $1 -t $2 -i $3 -i $global_palette -lavfi "$filters [x]; [x][1:v] paletteuse" -y $4


# Example Usage:
#              start    duration       input file     output file    fps      gif scale
#              -----    --------       ----------     -----------    ---      ---------
#   ./gif.sh   00:30     10            input.mp4      output.gif      20        260