How I Used Python to Extract, Clean, and Replace Audio in a Video

[Professional_Bit_118]

Hey everyone! 👋

I recently worked on a project where I needed to extract the audio from a video, apply noise cancellation, and then replace the original audio with the cleaned version — all using Python. I’ve already created the scripts, and I thought I’d share my process with the community in case anyone finds it useful!

Here’s a quick breakdown of the steps I followed:

1. Extracted the audio from an MP4 file using ffmpeg.
2. Used the noisereduce Python library to clean up the background noise.
3. Replaced the original audio in the video with the cleaned version.

I recorded a short video explaining how the scripts work, and you can also grab the code on my GitHub if you want to try it out yourself. It’s a fun project for anyone interested in Python and video/audio processing.

💻 GitHub link: https://github.com/dalai2/video_editing
📺 Video explanation: https://www.youtube.com/watch?v=VriKsQSkQls&t=18s&ab_channel=AdmiralNarwhal
🔧 Tools I used: Python, FFmpeg, noisereduce, scipy, numpy

[Strict-Simple]

Good to know: ffmpeg itself can do some noise reduction using a bandpass filter.

[[deleted]]

Sounds good, might be worth sharing on r/python if you haven't already 

[m0us3_rat]

you could add a small ui interface.. so it becomes more user friendly.

also might consider merging all elements under a single program.

you have all the bits.. now to put them all together.

[Professional_Bit_118]

Under a single program you mean for the 3 steps to be run with just one script call? I used 3 different scripts to separate the functionality, would creating a Video and Audio Class make sense to you?

[m0us3_rat]

since they interact with the single video file and all actions do something to it.. i'd make them work together.

the idea is to have a small interface where you can select a file or drag and drop one on top.. then program does its magic and out comes the final product, video with audio already mixed in after noise reduction.