download a youtube file as 720, 1080, or best (you can pass whatever exists tbh)

py-youtube-dl.py

import yt_dlp

def download_video(url, resolution="best"):
    try:
        # Set up yt-dlp options
        if resolution in ["720", "1080"]:
            # If the user specifies a resolution, prioritize that
            ydl_opts = {
                'format': f'bestvideo[height<={resolution}]+bestaudio/best',  # Download best video with audio at requested resolution
                'outtmpl': '%(title)s.%(ext)s',  # Output filename template (keeps original file extension)
                'noplaylist': True,  # Skip playlists
                'postprocessors': [],  # Avoid any post-processing (i.e., no re-encoding)
                'merge_output_format': 'mp4',  # Ensure the output is in MP4 format if merging streams
            }
        else:
            # If 'best' is specified, download the best available resolution
            ydl_opts = {
                'format': 'bestvideo+bestaudio/best',  # Download the best video and audio quality available
                'outtmpl': '%(title)s.%(ext)s',  # Output filename template (keeps original file extension)
                'noplaylist': True,  # Skip playlists
                'postprocessors': [],  # Avoid any post-processing (i.e., no re-encoding)
                'merge_output_format': 'mp4',  # Ensure the output is in MP4 format if merging streams
            }

        # Use yt-dlp to download the video
        with yt_dlp.YoutubeDL(ydl_opts) as ydl:
            print(f"Downloading video from {url} in {resolution}...")
            ydl.download([url])
            print("Download completed!")

    except Exception as e:
        print(f"Error: {e}")

if __name__ == "__main__":
    url = input("Enter the YouTube video URL: ")
    resolution = input("Enter desired resolution (720, 1080, or best): ")
    download_video(url, resolution)


# python3 py-youtube-dl.py
# Enter the YouTube video URL: https://www.youtube.com/watch?v=dQw4w9WgXcQ
# Enter desired resolution (720, 1080, or best): 1080
# Downloading video from https://www.youtube.com/watch?v=dQw4w9WgXcQ in 1080...
# [youtube] Extracting URL: https://www.youtube.com/watch?v=dQw4w9WgXcQ
# [youtube] dQw4w9WgXcQ: Downloading webpage
# [youtube] dQw4w9WgXcQ: Downloading tv client config
# [youtube] dQw4w9WgXcQ: Downloading tv player API JSON
# [youtube] dQw4w9WgXcQ: Downloading ios player API JSON
# [youtube] dQw4w9WgXcQ: Downloading m3u8 information
# [info] dQw4w9WgXcQ: Downloading 1 format(s): 616+251
# [hlsnative] Downloading m3u8 manifest
# [hlsnative] Total fragments: 39
# [download] Destination: XXXXXX (Official Music Video).f616.mp4
# [download] 100% of   94.86MiB in 00:00:09 at 10.26MiB/s
# [download] Destination: XXXXXX (Official Music Video).f251.webm
# [download] 100% of    3.28MiB in 00:00:01 at 2.93MiB/s
# [Merger] Merging formats into "XXXXXX (Official Music Video).mp4"
# Deleting original file XXXXXX (Official Music Video).f616.mp4 (pass -k to keep)
# Deleting original file XXXXXX (Official Music Video).f251.webm (pass -k to keep)
# Download completed!