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 pytube import YouTube
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 the audio from a YouTube video and converts it to MP3 format.
    
    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.
    - Create a YouTube object from the provided URL and log the video title.
    - Filter to find the best available audio stream and log the search.
    - Download the audio and save it in the output_path, logging the completion of the download.
    - Define the MP3 file path based on the downloaded file.
    - Convert the downloaded audio to MP3 using pydub and log the conversion.
    - Remove the original audio file and log the removal.
    - Log the completion of the entire process.
    """
    try:
        logging.info("Starting download process...")
        
        # Download the video
        yt = YouTube(url)
        logging.info(f"Video title: {yt.title}")
        logging.info("Looking for the best available audio stream...")
        
        video = yt.streams.filter(only_audio=True).first()
        logging.info("Downloading audio...")
        
        downloaded_file = video.download(output_path=output_path)
        logging.info(f"Audio successfully downloaded: {downloaded_file}")

        # Define the output file path
        base, ext = os.path.splitext(downloaded_file)
        mp3_file = base + '.mp3'

        logging.info("Converting audio to MP3...")
        
        # Convert to MP3 using pydub
        audio = AudioSegment.from_file(downloaded_file)
        audio.export(mp3_file, format="mp3")
        logging.info(f"Conversion completed: {mp3_file}")

        # Remove the original video file
        os.remove(downloaded_file)
        logging.info("Original video file removed.")

        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")
    videos_folder = os.path.join(user_profile, "Videos")

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