#!/usr/bin/env bash while getopts af: flag do case "${flag}" in a) all="true";; f) fullname=${OPTARG};; *) echo ${OPTARG};; esac done echo $all # echo $2 if [ $all ]; then ffmpeg -framerate 1 -pattern_type glob -i '*.jpg' \ -vf 'scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1' \ -c:v libx264 -r 30 -pix_fmt yuv420p slideshow.mp4 fi