Mplayer: change tempo and pitch of audio file

You may have a need to speed up / slow down and audio file, but would rather not be listening to chipmunks or very deep voices in the process. Also, you may wish to change the pitch of a file whilst maintaining the tempo.

Changing the tempo whilst retaining the same pitch:

this will speed up the playback of the file whilst retaining the same pitch

Changing the pitch whilst retaining the tempo:

On it’s own, this does nothing, a bit more work to do:

edit ~/.mplayer/input.conf and add the following:

and save. Now run the previous command and use the [ & ] keys to change the pitch up and down, by a musical semitone each time.

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