Tips: To transpose song's key

To transpose song's key

If you know the original key

See https://github.com/suntong/ffcvt/issues/30

In summary, to transpose a .mp3 file:

ffcvt -force -t '' -ext _.mp3 -abr 72k -tkf X -tkt Y -f input.mp3
mpv --force-window input_.mp3

If you don't know the original key

See https://github.com/suntong/ffcvt/issues/32

# up 2 chromatic scale (A -> B)
ffcvt -force -t '' -ext _+2.mp3 -abr 72k -tkb +2 -f 440.wav

# down 5 chromatic scale (A -> E)
ffcvt -force -t '' -ext _-5.mp3 -abr 72k -tkb -5 -f 440.wav