# Get MP3 length in seconds
mp3info -p "%S"

# Play an audio on macos from terminal

afplay file.wav

# Volume normalization
ffmpeg -i a.wav -af loudnorm=I=-23:LRA=1 -ar 44100 b.wav

# Compression
ffmpeg -i a.wav  -filter_complex \
  "compand=attacks=0:points=-30/-900|-20/-20|0/0|20/20" \
  d.wav

# Stronger compression and gain
ffmpeg -i a.wav -filter_complex \
"compand=attacks=0:points=-80/-900|-45/-15|-27/-9|0/-7|20/-7:gain=5" e.wav

# Create a waveform graphic of an audio file
ffmpeg -i e.wav -filter_complex ""aformat=channel_layouts=mono,showwavespic=s=1000x200"" -frames:v 1 e.png