pitch – Dušan Mulac

Speeding up tempo of an mp3 (without pitch distortion)

If you want to permanently change the pitch in an (eg.) mp3 file, you can use sox – this command will make the audio file 1.5x faster:

sox input.mp3 output.mp3 tempo 1.5

Sound pitch fix with fast-forward in mplayer

Have you ever watched a video on Youtube using a faster play speed (1.25x, 1.5x,..) and the sound seemed “the same but faster”. Ever did the same (using [ and ] keys) in mplayer, and all the voices were higher (high-pitched), and hard to listen and understand? There’s a filter in mplayer that fixes that and it’s called scaletempo.

mplayer -af scaletempo /foo/video.mp4

Now you can change the playback speed without the annoying pitch changes!