This script allows you to download the audio from a YouTube video and convert it to MP3 format, saving the resulting file in the user's "Videos" folder on Windows. Dependencies include pytube, pydub, and ffmpeg.

download_yt_mp3.py

import logging
from yt_dlp import YoutubeDL
from pydub import AudioSegment
import os
import sys

# Logger configuration
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')

def download_youtube_video_as_mp3(url, output_path):
    """
    Downloads audio from a YouTube video and converts it to MP3 using yt-dlp.
    
    Parameters:
    url (str): The URL of the YouTube video to be downloaded.
    output_path (str): The path where the MP3 file will be saved.
    
    Steps:
    - Start the download process and log the initial message.
    - Use yt-dlp to find and download the best available audio stream.
    - Define output file name and convert audio to MP3 format.
    - Log the completion of the download and conversion.
    """
    try:
        logging.info("Starting download process...")

        # yt-dlp options for downloading best audio and converting to mp3
        ydl_opts = {
            'format': 'bestaudio/best',
            'outtmpl': os.path.join(output_path, '%(title)s.%(ext)s'),
            'postprocessors': [{
                'key': 'FFmpegExtractAudio',
                'preferredcodec': 'mp3',
                'preferredquality': '192',
            }],
        }

        # Using yt-dlp to download and convert audio to MP3
        with YoutubeDL(ydl_opts) as ydl:
            info = ydl.extract_info(url, download=True)
            mp3_file = ydl.prepare_filename(info).replace('.webm', '.mp3')
            logging.info(f"Download and conversion completed: {mp3_file}")

    except Exception as e:
        logging.error(f"An error occurred: {e}")

if __name__ == "__main__":
    if len(sys.argv) != 2:
        logging.error("Usage: python download_mp3.py <YouTube video URL>")
        sys.exit(1)

    # Get the user's "Videos" folder path
    user_profile = os.getenv("USERPROFILE") or os.path.expanduser("~")
    videos_folder = os.path.join(user_profile, "Videos")

    url = sys.argv[1]
    download_youtube_video_as_mp3(url, videos_folder)

I had some problems with pytube them I shift to yt_dlp.