app.py

import os
import subprocess
import uuid
import glob
import gradio as gr

# Set default acceleration and extra encoding options.
accel = 'auto'
extra = '-crf 63 -c:v libx264'  # default extra settings

# Fixed upload and conversion folders.
UPLOAD_FOLDER = 'uploads'
CONVERTED_FOLDER = 'converted'
os.makedirs(UPLOAD_FOLDER, exist_ok=True)
os.makedirs(CONVERTED_FOLDER, exist_ok=True)

# Helper function to configure audio options.
def configure_audio(cmd_list, use_mp3):
    if use_mp3:
        cmd_list.extend(['-c:a', 'libmp3lame', '-b:a', '8k', '-ar', '24k', '-ac', '1'])
    else:
        cmd_list.extend(['-c:a', 'aac', '-b:a', '1k', '-ar', '8k', '-ac', '1'])

def convert_video(use_youtube, youtube_url, video_file, downscale, faster, use_mp3, audio_only):
    """
    Converts a video either from a YouTube URL or an uploaded file.
    Returns a tuple (preview_file, download_file) with the output path.
    """
    # Determine output filename based on whether only audio is desired.
    if audio_only:
        output_filename = f"{uuid.uuid4()}.mp3" if use_mp3 else f"{uuid.uuid4()}.aac"
    else:
        output_filename = f"{uuid.uuid4()}.mp4"
    output_path = os.path.join(CONVERTED_FOLDER, output_filename)
    
    files_to_delete = []  # For temporary file cleanup.
    
    if use_youtube:
        if not youtube_url:
            return "Error: YouTube URL is required.", None

        # Determine quality based on whether downscale is ticked.
        if downscale:
            quality = 'worstaudio' if audio_only else 'worstvideo+worstaudio'
        else:
            quality = 'b'  # Use "-f b" for best quality if downscale is not ticked.
        
        yt_uuid = str(uuid.uuid4())
        yt_input_filename = yt_uuid + ".%(ext)s"
        yt_input_path = os.path.join(UPLOAD_FOLDER, yt_input_filename)
        yt_dlp_cmd = ['yt-dlp', '-o', yt_input_path, '-f', quality, youtube_url]
        try:
            subprocess.run(yt_dlp_cmd, check=True)
        except subprocess.CalledProcessError as e:
            return f"An error occurred during YouTube download: {e}", None

        # Locate the downloaded file (yt-dlp replaces %(ext)s with the actual extension).
        pattern = os.path.join(UPLOAD_FOLDER, yt_uuid + ".*")
        downloaded_files = glob.glob(pattern)
        if not downloaded_files:
            return "Failed to download YouTube video.", None
        yt_input_file = downloaded_files[0]
        files_to_delete.append(yt_input_file)
        
        # Build FFmpeg command using the downloaded file.
        ffmpeg_cmd = ['ffmpeg', '-hwaccel', accel, '-y', '-i', yt_input_file] + extra.split()
    else:
        # File upload branch.
        if not video_file:
            return "Error: No video file provided.", None
        # Gradio passes the file path as a string.
        ext = os.path.splitext(video_file)[1]
        input_filename = f"{uuid.uuid4()}{ext}"
        input_path = os.path.join(UPLOAD_FOLDER, input_filename)
        # Move the uploaded file to our upload folder.
        os.rename(video_file, input_path)
        files_to_delete.append(input_path)
        ffmpeg_cmd = ['ffmpeg', '-hwaccel', accel, '-y', '-i', input_path] + extra.split()
    
    # Apply downscale if requested.
    if downscale:
        ffmpeg_cmd.extend(['-vf', 'scale=144:-2'])
    # Apply faster conversion if selected.
    if faster:
        ffmpeg_cmd.extend(['-preset', 'ultrafast'])
    
    # Configure audio encoding.
    if audio_only:
        ffmpeg_cmd.extend(['-vn'])
        configure_audio(ffmpeg_cmd, use_mp3)
    else:
        configure_audio(ffmpeg_cmd, use_mp3)
    
    # Append output file path.
    ffmpeg_cmd.append(output_path)
    
    # Run FFmpeg.
    try:
        subprocess.run(ffmpeg_cmd, check=True)
    except subprocess.CalledProcessError as e:
        return f"An error occurred during conversion: {e}", None

    # (Optional: cleanup temporary files here if desired.)
    # Return output file path for preview and download.
    return output_path, output_path

# Create the Gradio interface.
with gr.Blocks() as demo:
    gr.Markdown("## Low Quality Video Inator")
    gr.Markdown("Upload a video or use a YouTube URL and adjust the options below.")
    
    with gr.Row():
        use_youtube = gr.Checkbox(label="Use YouTube URL", value=False)
        youtube_url = gr.Textbox(label="YouTube URL", placeholder="Enter YouTube URL here")
    video_file = gr.File(label="Upload Video")
    
    with gr.Row():
        downscale = gr.Checkbox(label="Downscale Video (144p)", value=False)
        faster = gr.Checkbox(label="Faster Conversion (more pixelated)", value=False)
    with gr.Row():
        use_mp3 = gr.Checkbox(label="Use MP3 (video audio compression)", value=False)
        audio_only = gr.Checkbox(label="Only Audio (no video)", value=False)
    
    convert_button = gr.Button("Convert Video")
    
    gr.Markdown("### Preview Converted Video")
    video_preview = gr.Video(label="Converted Video")
    gr.Markdown("### Download Converted Video")
    file_download = gr.File(label="Download Video")
    
    convert_button.click(
        convert_video, 
        inputs=[use_youtube, youtube_url, video_file, downscale, faster, use_mp3, audio_only],
        outputs=[video_preview, file_download]
    )

demo.launch()