A short script to denoise the audio of a noisy video.

denoise.py

import soundfile as sf
import numpy as np
import librosa
import noisereduce as nr

# If you don't have the libraries above: 
# pip install noisereduce librosa numpy soundfile

# Run ffmpeg first to extract the sound from the video
# ffmpeg -i 'noisy_video.mp4' -vn -acodec copy 'noisy_signal.aac'



def denoise_noisy_sound_in_video(input_path, output_path):
    # sr is the sampling rate of the audio signal.
    y, sr = librosa.load(input_path, sr=None) 
    reduced_noise_audio = nr.reduce_noise(y=y, sr=sr)
    sf.write(output_path, reduced_noise_audio, sr)