app.py

import streamlit as st
from pytube import YouTube
import os
import base64

# Function to download YouTube video and return the path of the downloaded file
def download_video(url, selected_quality):
    try:
        yt = YouTube(url)
        st.write("Video Title:", yt.title)
        st.write("Downloading...")
        stream = yt.streams.filter(progressive=True, file_extension='mp4').get_by_resolution(selected_quality)
        download_path = os.path.join(os.path.expanduser("~"), "Downloads")
        downloaded_file_path = stream.download(output_path=download_path)
        st.success("Download completed successfully!")
        return downloaded_file_path
    except Exception as e:
        st.error(f"An error occurred: {e}")
        return None

# Function to create a download link
def create_download_link(file_path):
    file_name = os.path.basename(file_path)
    with open(file_path, "rb") as f:
        bytes = f.read()
        b64 = base64.b64encode(bytes).decode()
        href = f'<a href="data:file/mp4;base64,{b64}" download="{file_name}">Download {file_name}</a>'
        return href

# Streamlit UI
st.title("YouTube Video Downloader")

url = st.text_input("Enter YouTube Video URL:", "")
quality_options = ["1080p", "720p", "480p", "360p"]
selected_quality = st.selectbox("Select Video Quality:", quality_options)

if st.button("Download"):
    if url.strip() == "":
        st.warning("Please enter a YouTube video URL.")
    else:
        downloaded_file_path = download_video(url, selected_quality)
        if downloaded_file_path:
            download_link = create_download_link(downloaded_file_path)
            st.markdown(download_link, unsafe_allow_html=True)