Mixtape video with video background

mixtape-video.sh

#!/usr/bin/env bash

font_file="~/Library/Fonts/GoNotoCurrent.ttf"

video_background="$1"
shift

function ellipsis (){
  awk -v len=$1 '{ if (length($0) > len) print substr($0, 1, len-3) "..."; else print; }'
}

for file in "$@"; do
  title="$(exiftool -Title -b "$file" | ellipsis 25)"
  artist="$(exiftool -Artist -b "$file" | ellipsis 60)"
  album="$(exiftool -Album -b "$file" | ellipsis 70)"
  year="$(exiftool -Date -b "$file" | cut -c1-4)"
  duration="$(printf '%.3f' $(ffprobe -i "$file" -show_entries format=duration -v quiet -of csv="p=0"))"
  half_duration="$(echo "$duration*.5" | bc)"
  if [ "$video_background" == "no" ]; then
    background_file="~/Pictures/mixtape.jpg"
  else
    background_file="$(mktemp).mp4"
    ffmpeg -y -ss 0 -t "$half_duration" -i "$video_background" -y -filter_complex "[0]split[b][c];[c]reverse[r];[b][r]concat" "$background_file"
  fi
  ffmpeg -y \
    -i "$background_file" \
    -i "$file" \
    -filter_complex "[1:v]scale=500:500,crop=w=500:h=500[ovrl]; \
    [0:V]drawtext=fontsize=36:fontfile='$font_file':fontcolor=white:shadowcolor=black@0.4:shadowx=2:shadowy=2:text='${title//:/\\:}':x=(W/2)-20:y=H-(3.5*(H/10))[f1]; \
    [f1]drawtext=fontsize=26:fontfile='$font_file':fontcolor=white:shadowcolor=black@0.4:shadowx=2:shadowy=2:text='${artist//:/\\:}':x=(W/2)-20:y=H-(4*(H/10))[f2]; \
    [f2]drawtext=fontsize=22:fontfile='$font_file':fontcolor=white:shadowcolor=black@0.4:shadowx=2:shadowy=2:text='${album//:/\\:}':x=(W/2)-20:y=H-(2.5*(H/10))[f3]; \
    [f3]drawtext=fontsize=15:fontfile='$font_file':fontcolor=white:shadowcolor=black@0.4:shadowx=2:shadowy=2:text='${year//:/\\:}':x=(W/2)-20:y=H-(2*(H/10))[bg]; \
    [bg]drawbox=x=((iw-w)/12)+1:y=((ih-h)/2)+2:w=500:h=500:color=black@0.2[box]; \
    [box][ovrl]overlay=(W-w)/12:(H-h)/2" \
    -s "1920x1080" \
    -c:v libx264 -preset slow -crf 18 -profile:v high -level 4.0 \
    -bf 2 -coder 1 -pix_fmt yuv420p -b:v 10M -threads 4 -cpu-used 0 -r 30 \
    -movflags +faststart "${file}.mp4"
done

ffmpeg -safe 0 -f concat \
  -i <(for f in "$@"; do echo "file '$PWD/${f}.mp4'"; done) \
  -c copy mixtape.mp4