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.
You can use SoX (Sound eXchange):
- open source
- Windows / Linux / Mac
- 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
stretchto 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.
You can use Paulstretch (a.k.a. Paul's Extreme Sound Stretch):
- 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