In this tutorial, we will introduce how to change or modify the speed of an audio file using python. You will use python pysndfx library to implement it.
Preliminary
In order to use python pysndfx, we should install sox application firstly, you can view this tutorial to learn how to install.
A Step Guide to Install SoX (Sound eXchange) on Windows 10 – Python Tutorial
Then we can use pip to install pysndfx
pip install pysndfx
How to use python pysndfx to modify the speed of an audio file
In this section, we will introduce you how to do.
Step 1: we will load some libraries
import soundfile as sf from pysndfx import AudioEffectsChain
Step 2: we will read a wav audio file using soundfile
For example:
sound_path = 'test.wav' s, rate = sf.read(sound_path)
Here we will read the data of test.wav, which is a single channel audio.
Step 3: use AudioEffectsChain to change the speed of an audio file
For example:
fx = (AudioEffectsChain().speed(0.8)) s = fx(s, sample_in=rate)
In this example, we will change the speed to 0.8*speed.
Step 4: save modified audio
Finally, we will save audio data using soundfile
For example:
dst = 'test_1.2.wav' sf.write(dst, s, rate, 'PCM_16')
The audio file may look like:
