www.kaa.org.ua

Usage: ./video2gif.sh -i INPUT_FILE -o OUTPUT_FILE [-t TIME_RANGE] [-s POSITION] [-f FPS] [-w WIDTH] [-h HEIGHT] [-c MAX_COLORS]
 -i input video file
 -o output gif file
 -s start position HH:MM:SS (example: 00:05:30, 05:30, 30)
 -t time range in seconds
 -f frames per second, by default 10
 -w width, by default 320 pixel
 -h height, by default respect aspect ratio
 -c max colors, by default 64
 

#!/usr/bin/env bash

fps='10'
height='-1'
loglevel='warning'
max_colors=64
start=
timeout=
width='320'

function args_usage
{
    echo "Usage: ${0} -i INPUT_FILE -o OUTPUT_FILE [-t TIME_RANGE] [-s POSITION] [-f FPS] [-w WIDTH] [-h HEIGHT] [-c MAX_COLORS]"
    echo ' -i input video file'
    echo ' -o output gif file'
    echo ' -s start position HH:MM:SS (example: 00:05:30, 05:30, 30)'
    echo ' -t time range in seconds'
    echo " -f frames per second, by default ${fps}"
    echo " -w width, by default ${width} pixel"
    echo ' -h height, by default respect aspect ratio'
    echo " -c max colors, by default ${max_colors}"

    exit 1
}

function args_parse
{
    while getopts 'i:o:s:t:f:w:h:c:' opt; do
        case $opt in
            i)
                input_file=${OPTARG};;
            o)
                output_file=${OPTARG};;
            s)
                start="-ss ${OPTARG}";;
            t)
                timeout="-t ${OPTARG}";;
            f)
                fps=${OPTARG};;
            w)
                width=${OPTARG};;
            h)
                height=${OPTARG};;
            h)
                max_colors=${OPTARG};;
            \?)
                args_usage;;
        esac
    done

    if [ -z ${input_file+x} ]; then
        echo 'Please, specify input file!'
        args_usage
    fi

    if [ -z ${output_file+x} ]; then
        echo 'Please, specify output file!'
        args_usage
    fi
}

args_parse "${@}"

palette_file=$(tempfile --suffix ".png")

ffmpeg -v "${loglevel}" ${start} ${timeout} \
    -i "${input_file}" \
    -vf "fps=${fps},scale=${width}:${height}:flags=lanczos,palettegen=max_colors=${max_colors}" \
    -y "${palette_file}" && \
ffmpeg -v "${loglevel}" ${start} ${timeout} \
    -i "${input_file}" -i "${palette_file}" \
    -lavfi "fps=${fps},scale=${width}:${height}:flags=lanczos [x]; [x][1:v] paletteuse" \
    -f gif \
    -y "${output_file}"

rc=${?}

if [ -e ${palette_file} ]; then
    rm ${palette_file}
fi

exit ${rc}