4K timelapse from photos using ffmpeg

timelapse.sh

#!/bin/bash

if [[ -z "$1" || -z "$2" ]]; then
  echo "Usage: timelapse input/*.jpg output.mp4";
  exit;
fi

mkdir "./working"

output="${!#}"

files_length=$(($#-1));
files=${@:1:$files_length}
for f in $files; do
  base_f=`basename $f`;
  f_noext="${base_f%.*}"

  echo "Scaling $base_f"; 
  convert "$f" -resize "3840x2160^" -gravity center -crop "3840x2160+0+0" "./working/$f_noext.jpg";
done

ffmpeg -framerate 24 -pattern_type glob -i './working/*.jpg' -c:v libx264 -pix_fmt yuv420p "$output"

rm -r "./working"