Converts GIF to MP4 optimized for Telegram

gif2mp4

#!/usr/bin/env bash

# Author: Rix
# Version: 0.0.1

set -eu -o errexit -o pipefail -o nounset

function print_usage {
    echo 'Usage: gif2mp4 [-c] <[-r] INPUT> ...'
    echo '  -c, --concat <OUTPUT> concat all inputs into single MP4'
    echo '  -r, --repeat <COUNT>  repeats count for following inputs'
}

function log {
    local LEVEL="$1"
    local MSG="$(date '+%D %T') [${LEVEL}] $2"
    case "${LEVEL}" in
        INFO*)      MSG="\x1B[94m${MSG}\e[0m";;
        WARNING*)   MSG="\x1B[93m${MSG}\e[0m";;
        ERROR*)     MSG="\x1B[91m${MSG}\e[0m";;
        *)
    esac
    echo -e "${MSG}"
}

function require {
    if [ ! -x "$(command -v "$1")" ]; then
        log "ERROR" "$1 is not found"'!' >&2
        exit 1
    fi
}

function join_by {
    local IFS="$1"; shift; echo "$*"
}

require ffmpeg

INPUTS=()
REPEAT=()
CONCAT=""

CURRENT_REPEAT=1

while [[ $# -gt 0 ]]; do
    OPT="$1"
    case $OPT in
        -c|--concat)
        CONCAT="$2"
        shift 2
        ;;
        -r|--repeat)
        CURRENT_REPEAT="$2"
        shift 2
        ;;
        -h|--help)
        print_usage
        exit 0
        ;;
        -*)
        print_usage
        exit 2
        ;;
        *)
        INPUTS+=("$1")
        REPEAT+=("${CURRENT_REPEAT}")
        shift
        ;;
    esac
done

INPUTS_LEN=${#INPUTS[@]}

if [[ ${INPUTS_LEN} -lt 1 ]]; then
    print_usage
    exit 2
fi

if [[ ${INPUTS_LEN} -eq 1 && -n "${CONCAT}" ]]; then
    log WARNING "Skip concat for single input!"
    CONCAT=""
fi

if [[ -n "${CONCAT}" ]]; then
    mkdir -p $(dirname "${CONCAT}")
fi

OUTPUTS=()

for i in ${!INPUTS[*]}; do 
    INPUT="${INPUTS[$i]}"
    if [[ -n "${CONCAT}" ]]; then
        OUTPUT="${INPUT%.*}.ts"
    else
        OUTPUT="${INPUT%.*}.mp4"
    fi
    CMD=(ffmpeg -i "${INPUT}" -ignore_loop 1 -filter_complex "loop=$((${REPEAT[$i]}-1)):32767:0,scale=trunc(iw/2)*2:trunc(ih/2)*2" -y -pix_fmt yuv420p -c:v libx264 -crf 20)
    if [[ -n "${CONCAT}" ]]; then
        CMD+=(-bsf:v h264_mp4toannexb -f mpegts)
    fi
    CMD+=("${OUTPUT}")
    "${CMD[@]}"
    OUTPUTS+=("${OUTPUT}")
done

if [[ -n "${CONCAT}" ]]; then
    ffmpeg -i "concat:$(join_by '|' "${OUTPUTS[@]}")" -y -pix_fmt yuv420p -c:v libx264 -crf 20 "${CONCAT}" 
fi