[Tut] Python Video To Audio

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Python Video To Audio

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A good friend and his wife recently founded an AI startup in the lifestyle niche that uses machine learning to discover specific real-world patterns from videos.

For their business system, they need a pipeline that takes a video file, converts it to audio, and transcribes the audio to standard text that is then used for further processing. I couldn’t help but work on a basic solution to help fix their business problem.

Recommended: Large Audio to Text? Here’s My Speech Recognition Solution in Python

Mini Project Goal – Video to Audio in Python



In this short project tutorial, I’ll share my code solution to convert a video to audio, i.e., extracting a

Code:

.wav

file from a

Code:

.mp4

file.

Code:

Given: .mp4 video file Required: .wav audio file

Use Python to accomplish this programmatically!

Mini Project Solution – Video to Audio in Python



You can convert a video file to an audio file as follows. First, create a function that takes the location of your input video file as the

Code:

in_path

parameter and the location of your output audio file as the

Code:

out_path

parameter. Second, install and import the

Code:

moviepy

library to read the video file and write out the audio file in the

Code:

.wav

format.

Code:

import moviepy.editor as mp def video_to_audio(in_path, out_path): """Convert video file to audio file""" video = mp.VideoFileClip(in_path) video.audio.write_audiofile(out_path) # Video to audio video_to_audio('sample_video.mp4', 'sample_audio.wav')

Before this code runs without error, you first need to

Code:

pip install moviepy

in your environment. For instance, if you run Python 3.10, you’d probably have to run

Code:

pip3.10 install moviepy

. More here:

Recommended: How to Install a Python Library?

Alternative Using Subprocess

Using Python, you can convert a video file to an audio file by using the subprocess library. First, store the location of the input video file in the

Code:

in_path

variable, and the location of the output audio file in the

Code:

out_path

variable. Then, call the

Code:

subprocess.run()

method with the command line parameters to convert the video file to an audio file. The output audio file will be in the

Code:

.wav

format.

Code:

import subprocess in_path = 'sample_video.mp4' out_path = 'sample_audio.wav' subprocess.run(["ffmpeg", "-i", in_path, out_path])

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Thanks!

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