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What the best command-line tool that runs on Windows to speed up MP3s? A tool that I give an mp3 (or wav) and that returns an mp3.

  • Do you want to play or edit+save them via command-line? – unor Sep 13 '14 at 13:28
  • @unor: Edit+save – Christian Sep 13 '14 at 13:55
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You can use SoX (Sound eXchange):

  • free
  • open source
  • Windows / Linux / Mac
  • CLI
  • can speed up MP3s: e.g. sox --show-progress in.mp3 out.mp3 speed 2. You may want to change the pitch as well, e.g. sox --show-progress in.mp3 out.mp3 speed 2 pitch -200. You can otherwise use stretch to change the rate of playback of an audio sample while preserving the pitch. For example to x2 speed a file: sox --show-progress in.mp3 out.mp3 stretch 0.5

FYI: SoX manual.

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  • I would prefer if the tool would automatically change the pitch to the correct value as well. Otherwise how do I know the correct pitch adjustment? – Christian Sep 14 '14 at 16:14
  • @Christian Answer edited, example with stretch added. – Franck Dernoncourt Sep 14 '14 at 17:06
1

You can use Paulstretch (a.k.a. Paul's Extreme Sound Stretch):

  • free
  • Open-Source (version 2 of the General Public License)
  • source code for Linux or the Windows binaries available
  • CPP and Python versions available. The Python version provides a CLI.

Description from the website:

  • It produces high quality extreme sound stretching. While most sound stretching software sounds bad when trying to stretch the sounds a lot, this one is optimized for extreme sound stretching. So, the stretch amount is unlimited.
  • You can play the stretched sound in real-time (including the possibility to "freeze" the sound) or you can render the whole sound or a part of it to audio files
  • It has many post-processing effects, like: filters, pitch/frequency shifters
  • Support for WAV, OGG VORBIS files and MP3 files

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