app.py

import gradio as gr
from gradio import utils
import os
import re
import requests
from concurrent.futures import ThreadPoolExecutor
import time
from yt_dlp import YoutubeDL
import subprocess
import shutil
from typing import List, Tuple
import pandas as pd

def sanitize_title(title):
    return re.sub(r'[\\/*?:"<>|]', "", title)

def format_time(seconds):
    return time.strftime('%H:%M:%S', time.gmtime(seconds))

def get_video_info(video_url):
    with YoutubeDL({'quiet': True, 'no_warnings': True}) as ydl:
        try:
            info = ydl.extract_info(video_url, download=False)
            formats = info.get('formats', [])
            
            # Function to safely get bitrate
            def get_bitrate(format_dict, key):
                return format_dict.get(key, 0) or 0
            
            # Prefer adaptive formats (separate video and audio)
            video_formats = [f for f in formats if f.get('vcodec') != 'none' and f.get('acodec') == 'none']
            audio_formats = [f for f in formats if f.get('acodec') != 'none' and f.get('vcodec') == 'none']
            
            if video_formats and audio_formats:
                video_format = max(video_formats, key=lambda f: get_bitrate(f, 'vbr'))
                audio_format = max(audio_formats, key=lambda f: get_bitrate(f, 'abr'))
                return info['title'], video_format['url'], audio_format['url']
            else:
                # Fallback to best combined format
                combined_formats = [f for f in formats if f.get('vcodec') != 'none' and f.get('acodec') != 'none']
                if combined_formats:
                    best_format = max(combined_formats, key=lambda f: get_bitrate(f, 'tbr'))
                    return info['title'], best_format['url'], None
                else:
                    raise Exception("No suitable video formats found")
        except Exception as e:
            raise Exception(f"Error extracting video info: {str(e)}")

def download_segment(url, start_time, end_time, output_path):
    command = [
        'ffmpeg',
        '-ss', format_time(start_time),
        '-i', url,
        '-t', format_time(end_time - start_time),
        '-c', 'copy',
        '-y',
        output_path
    ]
    process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
    
    while True:
        output = process.stderr.readline()
        if output == '' and process.poll() is not None:
            break
        if output:
            yield output.strip()
    
    rc = process.poll()
    return rc == 0

def combine_segments(video_segments, audio_segments, output_path):
    temp_video = 'temp_video.mp4'
    temp_audio = 'temp_audio.m4a'
    
    # Concatenate video segments
    with open('video_list.txt', 'w') as f:
        for segment in video_segments:
            f.write(f"file '{segment}'\n")
    
    subprocess.run(['ffmpeg', '-f', 'concat', '-safe', '0', '-i', 'video_list.txt', '-c', 'copy', temp_video])
    
    # Concatenate audio segments if they exist
    if audio_segments:
        with open('audio_list.txt', 'w') as f:
            for segment in audio_segments:
                f.write(f"file '{segment}'\n")
        subprocess.run(['ffmpeg', '-f', 'concat', '-safe', '0', '-i', 'audio_list.txt', '-c', 'copy', temp_audio])
        
        # Combine video and audio
        subprocess.run(['ffmpeg', '-i', temp_video, '-i', temp_audio, '-c', 'copy', output_path])
    else:
        shutil.move(temp_video, output_path)
    
    # Clean up temporary files
    os.remove('video_list.txt')
    if os.path.exists('audio_list.txt'):
        os.remove('audio_list.txt')
    if os.path.exists(temp_video):
        os.remove(temp_video)
    if os.path.exists(temp_audio):
        os.remove(temp_audio)

def add_segment(start_hours, start_minutes, start_seconds, end_hours, end_minutes, end_seconds, segments):
    start_time = f"{start_hours:02d}:{start_minutes:02d}:{start_seconds:02d}"
    end_time = f"{end_hours:02d}:{end_minutes:02d}:{end_seconds:02d}"
    new_segment = f"{start_time}-{end_time}"
    new_row = pd.DataFrame([new_segment], columns=["Segment"])
    return pd.concat([segments, new_row], ignore_index=True)

def remove_segment(segments, index):
    return segments.drop(index).reset_index(drop=True)

def move_segment(segments, old_index, new_index):
    if 0 <= old_index < len(segments) and 0 <= new_index < len(segments):
        segment = segments.iloc[old_index]
        segments = segments.drop(old_index).reset_index(drop=True)
        segments = pd.concat([segments.iloc[:new_index], pd.DataFrame([segment]), segments.iloc[new_index:]]).reset_index(drop=True)
    return segments

def parse_segments(segments: pd.DataFrame) -> List[Tuple[int, int]]:
    parsed_segments = []
    for segment in segments['Segment']:
        if not isinstance(segment, str) or '-' not in segment:
            continue
        try:
            start, end = segment.split('-')
            start_seconds = sum(int(i) * 60 ** j for j, i in enumerate(reversed(start.split(':'))) if i)
            end_seconds = sum(int(i) * 60 ** j for j, i in enumerate(reversed(end.split(':'))) if i)
            if start_seconds < end_seconds:
                parsed_segments.append((start_seconds, end_seconds))
        except ValueError:
            continue  # Skip invalid segments
    return parsed_segments

def process_video(video_url, segments, combine, progress=gr.Progress()):
    if not video_url.strip():
        return 0, "Error: Please provide a valid YouTube URL", None

    # Extract segments from the Dataframe
    parsed_segments = parse_segments(segments)
    if not parsed_segments:
        return 0, "Error: No valid segments provided", None

    output_dir = 'output'
    os.makedirs(output_dir, exist_ok=True)

    try:
        video_title, video_url, audio_url = get_video_info(video_url)
    except Exception as e:
        return 0, f"Error: {str(e)}", None

    video_segments = []
    audio_segments = []
    total_segments = len(parsed_segments)

    for i, (start_time, end_time) in enumerate(parsed_segments):
        video_output = os.path.join(output_dir, f"{sanitize_title(video_title)}_video_segment_{i+1}.mp4")
        for output in download_segment(video_url, start_time, end_time, video_output):
            progress((i / total_segments) + (1 / total_segments) * 0.5)
            yield i * 100 // total_segments, f"Downloading video segment {i+1}/{total_segments}: {output}", None
        video_segments.append(video_output)

        if audio_url:
            audio_output = os.path.join(output_dir, f"{sanitize_title(video_title)}_audio_segment_{i+1}.m4a")
            for output in download_segment(audio_url, start_time, end_time, audio_output):
                progress((i / total_segments) + (1 / total_segments) * 0.75)
                yield i * 100 // total_segments + 50, f"Downloading audio segment {i+1}/{total_segments}: {output}", None
            audio_segments.append(audio_output)

    if combine:
        output_path = os.path.join(output_dir, f"{sanitize_title(video_title)}_combined.mp4")
        combine_segments(video_segments, audio_segments, output_path)
        yield 100, f"Segments combined and saved as {output_path}", output_path
    else:
        # If not combining, return the first video segment (you might want to modify this behavior)
        output_path = video_segments[0] if video_segments else None
        yield 100, "All segments downloaded successfully", output_path

    # Clean up individual segments if combined
    if combine:
        for segment in video_segments + audio_segments:
            os.remove(segment)

# Disable Gradio analytics
utils.colab_check = lambda: True

with gr.Blocks(title="YouTube Segment Downloader", theme=gr.themes.Soft(primary_hue="indigo", secondary_hue="blue")) as iface:
    gr.Markdown(
        """
        # YouTube Segment Downloader
        Download specific segments of YouTube videos with ease.
        """
    )
    
    with gr.Row():
        video_url = gr.Textbox(label="YouTube URL", placeholder="Enter YouTube URL here")
    
    with gr.Row():
        with gr.Column(scale=1):
            with gr.Group():
                gr.Markdown("### Add Segment")
                with gr.Row():
                    start_hours = gr.Number(label="Start", minimum=0, maximum=23, step=1, value=0)
                    start_minutes = gr.Number(label="", minimum=0, maximum=59, step=1, value=0)
                    start_seconds = gr.Number(label="", minimum=0, maximum=59, step=1, value=0)
                with gr.Row():
                    end_hours = gr.Number(label="End", minimum=0, maximum=23, step=1, value=0)
                    end_minutes = gr.Number(label="", minimum=0, maximum=59, step=1, value=0)
                    end_seconds = gr.Number(label="", minimum=0, maximum=59, step=1, value=0)
                add_btn = gr.Button("Add Segment", variant="primary")
        
        with gr.Column(scale=2):
            segments = gr.Dataframe(
                headers=["Segment"],
                row_count=5,
                col_count=1,
                datatype=["str"],
                interactive=True,
                label="Segments to Download"
            )
    
    with gr.Row():
        with gr.Column(scale=1):
            combine = gr.Checkbox(label="Combine Segments", value=True)
        with gr.Column(scale=2):
            submit_btn = gr.Button("Download Segments", variant="primary", size="lg")
    
    with gr.Row():
        progress = gr.Slider(label="Progress", minimum=0, maximum=100, step=1, interactive=False)
    
    with gr.Row():
        status = gr.Textbox(label="Status", lines=3)
    
    with gr.Row():
        output_file = gr.File(label="Downloaded Video")

    with gr.Accordion("Advanced Options", open=False):
        with gr.Row():
            remove_index = gr.Number(label="Remove Segment Index", minimum=0, step=1, value=0)
            remove_btn = gr.Button("Remove Segment", variant="secondary")
        with gr.Row():
            old_index = gr.Number(label="Move From Index", minimum=0, step=1, value=0)
            new_index = gr.Number(label="Move To Index", minimum=0, step=1, value=0)
            move_btn = gr.Button("Move Segment", variant="secondary")

    add_btn.click(
        add_segment,
        inputs=[start_hours, start_minutes, start_seconds, end_hours, end_minutes, end_seconds, segments],
        outputs=[segments]
    )

    submit_btn.click(
        process_video,
        inputs=[video_url, segments, combine],
        outputs=[progress, status, output_file]
    )

    remove_btn.click(
        remove_segment,
        inputs=[segments, remove_index],
        outputs=[segments]
    )

    move_btn.click(
        move_segment,
        inputs=[segments, old_index, new_index],
        outputs=[segments]
    )

iface.launch()