python video extract audio code example

Example 1: extract audio from .mp4 python .mp3

#!/usr/bin/env python3
"""
video_to_mp3.py
 
Description:
Simple script to extract MP3 audio from videos using Python.
 
Requirements:
 - "lame"
 - "ffmpeg"
 
If the libraries are not installed just run the following command in your terminal:
- On Mac(OS X): brew install lame ffmpeg
- On Linux(Ubuntu): sudo apt-get install lame ffmpeg
 
How to use the script:
Just run the following command within your terminal replacing "NAME_OF_THE_VIDEO.mp4" by the name of your video file:
$ python video_to_mp3.py NAME_OF_THE_VIDEO.mp4
 
Note.- The video must be within the same directory of the python script, otherwise provide the full path.
"""
import sys
import os
import time
 
 
def video_to_mp3(file_name):
    """ Transforms video file into a MP3 file """
    try:
        file, extension = os.path.splitext(file_name)
        # Convert video into .wav file
        os.system('ffmpeg -i {file}{ext} {file}.wav'.format(file=file, ext=extension))
        # Convert .wav into final .mp3 file
        os.system('lame {file}.wav {file}.mp3'.format(file=file))
        os.remove('{}.wav'.format(file))  # Deletes the .wav file
        print('"{}" successfully converted into MP3!'.format(file_name))
    except OSError as err:
        print(err.reason)
        exit(1)
 
 
def main():
    # Confirm the script is called with the required params
    if len(sys.argv) != 2:
        print('Usage: python video_to_mp3.py FILE_NAME')
        exit(1)
 
    file_path = sys.argv[1]
    try:
        if not os.path.exists(file_path):
            print('file "{}" not found!'.format(file_path))
            exit(1)
 
    except OSError as err:
        print(err.reason)
        exit(1)
 
    video_to_mp3(file_path)
    time.sleep(1)
 
 
if __name__ == '__main__':
    main()

Example 2: record and store audio in pythn

import pyaudio
import wave

chunk = 1024  # Record in chunks of 1024 samples
sample_format = pyaudio.paInt16  # 16 bits per sample
channels = 2
fs = 44100  # Record at 44100 samples per second
seconds = 3
filename = "output.wav"

p = pyaudio.PyAudio()  # Create an interface to PortAudio

print('Recording')

stream = p.open(format=sample_format,
                channels=channels,
                rate=fs,
                frames_per_buffer=chunk,
                input=True)

frames = []  # Initialize array to store frames

# Store data in chunks for 3 seconds
for i in range(0, int(fs / chunk * seconds)):
    data = stream.read(chunk)
    frames.append(data)

# Stop and close the stream 
stream.stop_stream()
stream.close()
# Terminate the PortAudio interface
p.terminate()

print('Finished recording')

# Save the recorded data as a WAV file
wf = wave.open(filename, 'wb')
wf.setnchannels(channels)
wf.setsampwidth(p.get_sample_size(sample_format))
wf.setframerate(fs)
wf.writeframes(b''.join(frames))
wf.close()