GIF from video // Run with $ sh gif.bash -i=InputFile.mov -o=OutputFile

gif.bash

#!/bin/bash

# Run with $ sh gif.bash -i=InputFile.mov -o=OutputFile

for i in "$@"
do
case $i in
    -i=*|--input=*)
    INPUT_FILE="${i#*=}"
    ;;
    -o=*|--output=*)
    OUTPUT_FILE="${i#*=}"
    ;;
    *)
            # unknown option
    ;;
esac
done


PALETTE_FILE=palette.png

ffmpeg -y -i "${INPUT_FILE}" -vf fps=10,scale=320:-1:flags=lanczos,palettegen "${PALETTE_FILE}" 
ffmpeg -ss 0 -i "${INPUT_FILE}" -i "${PALETTE_FILE}" -filter_complex "fps=10,scale=320:-1:flags=lanczos[x];[x][1:v]paletteuse" "${OUTPUT_FILE}.gif"
rm "${PALETTE_FILE}"

Needs ffmpeg to be installed.

It uses palettegen for higher quality gifs.

Creates a 320 width GIF from given input video. Accepts all video formats like .mp4, .mov etc.