Set MP3 Metadata with FFMPEG

make_test_metadata_mp3.sh

#!/bin/sh

# https://id3.org/id3v2.4.0-frames
# https://id3.org/id3v2.4.0-structure

Title="The Song Title"
TrackArtist="The Track Artist"
AlbumArtist="The Album Artists"
AlbumTitle="The Album Title"
Genre="(60)Top 40"
TrackNum="7/12"
DiskNum="2/3"
ReleaseDate="2000-07-15"
Publisher="The Publisher"
Copyright="The Copyright Holder"

ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -frames 2 -q:a 9 -acodec libmp3lame \
  -metadata TIT2="$Title" \
  -metadata TPE1="$TrackArtist" \
  -metadata TPE2="$AlbumArtist" \
  -metadata TALB="$AlbumTitle" \
  -metadata TCON="$Genre" \
  -metadata TRCK="$TrackNum" \
  -metadata TPOS="$DiskNum" \
  -metadata TDRC="$ReleaseDate" \
  -metadata TPUB="$Publisher" \
  -metadata TCOP="$Copyright" \
  -y test_metadata.mp3