Lower bitrate of an mp3 file

bitrate.sh

# Command to lower the bitrate of an mp3 using FFMPEG

# Options:
#   Low: 96k
#   Medium (Radio quality): 128k
#   Medium-High (CD quality): 192k
#   High: 320k

# "Converting an MP3 to a higher bit rate does not add any more
#  audio information to the file, so the sound quality does not
#  increase. Converting an MP3 to a lower bit rate reduces its
#  file size, but may also introduce audio artifacts, as the
#  encoder is compressing an already compressed file."
# —https://itstillworks.com/12582454/what-is-a-normal-mp3-bit-rate

ffmpeg -i input.mp3 -codec:a libmp3lame -b:a 128k output.mp3