Mixtape video with cover art background and audio spectrum visualization

mixtape-video-spectrum.sh

#!/usr/bin/env bash
set -e

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

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 "$file" | ellipsis 35)"
  artist="$(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)"
  ffmpeg -y \
    -i "$file" \
    -filter_complex "[0:v]scale=1280:-1,setsar=1,boxblur=20:20,crop=1280:720[bg];
    [0:v]scale=500:500,crop=w=500:h=500[cover]; \
    [0:a]aformat=channel_layouts=mono:sample_rates=16000,highpass=f=200,lowpass=f=4000,showfreqs=mode=line:ascale=cbrt:fscale=lin:win_size=1024:s=580x280:r=30:colors=white[sw]; \
    [0:a]aformat=channel_layouts=mono:sample_rates=16000,highpass=f=200,lowpass=f=4000,showfreqs=mode=line:ascale=cbrt:fscale=lin:win_size=1024:s=580x280:r=30:colors=black@0.4[sws]; \
    [bg]drawtext=fontsize=36:fontfile='$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='${year//:/\\:}':x=(W/2)-20:y=H-(2*(H/10))[cv]; \
    [cv]drawbox=x=((iw-w)/12)+1:y=((ih-h)/2)+2:w=500:h=500:color=black@0.2[box]; \
    [box][sws]overlay=((W/2)-20)+2:((H/2)-h)+2[boxsws]; \
    [boxsws][sw]overlay=(W/2)-20:(H/2)-h[boxsw]; \
    [boxsw][cover]overlay=(W-w)/12:(H-h)/2" \
    -s "1280x720" \
    -c:v libx264 -preset slow -crf 18 -profile:v high -level 4.0 \
    -bf 2 -coder 1 -pix_fmt yuv420p -b:v 10M -threads 4 -cpu-used 0 -r 30 \
    -movflags +faststart "${file}.mp4"
done

ffmpeg -y -safe 0 -f concat \
  -i <(for f in "$@"; do echo "file '$PWD/${f}.mp4'"; done) \
  -c:v copy -c:a aac -b:a 320k mixtape.mp4