app.py

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

os.system("chmod +x fdkaac")  # Ensure fdkaac is executable

accel = 'auto'
video_base_opts = ['-crf', '63', '-c:v', 'libx264', '-tune', 'zerolatency', '-movflags', '+faststart']

UPLOAD_FOLDER = 'uploads'
CONVERTED_FOLDER = 'converted'
os.makedirs(UPLOAD_FOLDER, exist_ok=True)
os.makedirs(CONVERTED_FOLDER, exist_ok=True)

async def run_subprocess(cmd, use_fdkaac=False):
    env = os.environ.copy()
    if use_fdkaac:
        env["LD_LIBRARY_PATH"] = os.path.abspath("./") + ":" + env.get("LD_LIBRARY_PATH", "")
    print(f"[DEBUG] Running command:\n{' '.join(cmd)}\n")
    process = await asyncio.create_subprocess_exec(
        *cmd,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
        env=env
    )
    stdout, stderr = await process.communicate()
    if process.returncode != 0:
        print(f"[ERROR] Command failed:\n{stderr.decode()}\n")
        raise subprocess.CalledProcessError(process.returncode, cmd, stderr.decode())
    print(f"[DEBUG] Command succeeded:\n{stdout.decode()}\n")
    return stdout.decode(), stderr.decode()

async def convert_video_task(input_path, downscale, faster, use_mp3, audio_only, custom_bitrate, video_bitrate, progress):
    if use_mp3:
        output_audio = os.path.join(CONVERTED_FOLDER, f"{uuid.uuid4()}.mp3")
        await progress(0.1, desc="Converting audio to MP3...")
        ffmpeg_audio_cmd = [
            'ffmpeg', '-y', '-i', input_path, '-vn',
            '-c:a', 'libmp3lame', '-b:a', '8k', '-ar', '24000', '-ac', '1',
            output_audio
        ]
        if audio_only:
            await run_subprocess(ffmpeg_audio_cmd)
            return output_audio, None
        else:
            output_video = os.path.join(CONVERTED_FOLDER, f"{uuid.uuid4()}.mp4")
            await progress(0.3, desc="Making the video quality lower...")
            ffmpeg_video_cmd = [
                'ffmpeg', '-y', '-hwaccel', accel, '-i', input_path
            ]
            if custom_bitrate:
                ffmpeg_video_cmd += ['-b:v', f"{int(video_bitrate)}k"]
            else:
                ffmpeg_video_cmd += video_base_opts
                if faster:
                    ffmpeg_video_cmd.extend(['-preset', 'ultrafast'])

            ffmpeg_video_cmd += [
                '-c:a', 'libmp3lame', '-b:a', '8k', '-ar', '24000', '-ac', '1',
                output_video
            ]
            await run_subprocess(ffmpeg_video_cmd)
            return None, output_video

    # AAC (fdkaac) path
    await progress(0.1, desc="Splitting Audio and Video...")
    audio_wav = os.path.join(CONVERTED_FOLDER, f"{uuid.uuid4()}.wav")
    audio_output = os.path.join(CONVERTED_FOLDER, f"{uuid.uuid4()}.m4a")
    video_output = os.path.join(CONVERTED_FOLDER, f"{uuid.uuid4()}.mp4")

    await run_subprocess([
        'ffmpeg', '-y', '-i', input_path, '-ac', '1', '-ar', '8000', audio_wav
    ])

    await progress(0.3, desc="Converting audio to AAC which is lower quality...")
    await run_subprocess([
        './fdkaac', '-b', '1k', '-C', '-f', '2', '-G', '1', '-w', '8000',
        '-o', audio_output, audio_wav
    ], use_fdkaac=True)

    await progress(0.6, desc="Making the video quality lower...")
    video_cmd = [
        'ffmpeg', '-y', '-hwaccel', accel, '-i', input_path
    ]
    if downscale:
        video_cmd += ['-vf', 'scale=-2:144']
    if custom_bitrate:
        video_cmd += ['-b:v', f"{int(video_bitrate)}k"]
    else:
        video_cmd += video_base_opts
        if faster:
            video_cmd.extend(['-preset', 'ultrafast'])
    video_cmd += ['-an', video_output]
    await run_subprocess(video_cmd)

    if audio_only:
        return audio_output, None

    await progress(0.9, desc="Mixing audio and video together...")
    merged_output = os.path.join(CONVERTED_FOLDER, f"{uuid.uuid4()}.mp4")
    await run_subprocess([
        'ffmpeg', '-y', '-i', video_output, '-i', audio_output, '-c', 'copy', merged_output
    ])

    for f in [audio_wav, audio_output, video_output]:
        try:
            os.remove(f)
        except FileNotFoundError:
            pass

    await progress(1.0)
    return None, merged_output

async def process_conversion(use_youtube, youtube_url, video_file, downscale, faster, use_mp3, audio_only, custom_bitrate, video_bitrate, progress=gr.Progress()):
    try:
        if use_youtube:
            if not youtube_url:
                return "Error: YouTube URL required.", None
            yt_uuid = str(uuid.uuid4())
            yt_out = os.path.join(UPLOAD_FOLDER, yt_uuid + ".%(ext)s")
            await progress(0, desc="Downloading from YouTube...")
            yt_cmd = ['yt-dlp', '-o', yt_out, '-f', 'b', youtube_url]
            await run_subprocess(yt_cmd)
            pattern = os.path.join(UPLOAD_FOLDER, yt_uuid + ".*")
            files = glob.glob(pattern)
            if not files:
                return "Download failed.", None
            input_path = files[0]
        else:
            if not video_file:
                return "No video provided.", None
            ext = os.path.splitext(video_file.name)[1]
            input_path = os.path.join(UPLOAD_FOLDER, f"{uuid.uuid4()}{ext}")
            shutil.copy2(video_file.name, input_path)

        audio_out, video_out = await convert_video_task(
            input_path, downscale, faster, use_mp3, audio_only, custom_bitrate, video_bitrate, progress
        )

        if audio_only:
            return audio_out, audio_out
        return video_out, video_out
    except Exception as e:
        return f"Error: {str(e)}", None

# Gradio Interface
with gr.Blocks(theme=gr.themes.Default(primary_hue="rose")) as demo:
    gr.Markdown("""
    # **Low Quality Video Inator**
    Upload a video or paste a YouTube URL below, then tweak the settings to your liking.
    """)

    with gr.Group():
        with gr.Row():
            use_youtube = gr.Checkbox(label="🔗 Use YouTube URL (If ran locally, then it works.)", value=False)
            youtube_url = gr.Textbox(label="YouTube URL", placeholder="Paste YouTube URL here")
        video_file = gr.File(label="📁 Upload Video File")

    gr.Markdown("### ⚙️ **Conversion Settings**")
    with gr.Group():
        with gr.Row():
            downscale = gr.Checkbox(label="Downscale Video to 144p", value=False)
            faster = gr.Checkbox(label="Faster Video Compression (will result in pixelated artifacts)", value=False)
        with gr.Row():
            use_mp3 = gr.Checkbox(label="Use MP3 Audio (however AAC sounds lower quality)", value=False)
            audio_only = gr.Checkbox(label="Audio Only", value=False)
        with gr.Row():
            custom_bitrate = gr.Checkbox(label="Custom Video Bitrate", value=False)
            video_bitrate = gr.Number(label="Bitrate (kbps)", visible=False)

        custom_bitrate.change(
            lambda checked: gr.update(visible=checked),
            inputs=[custom_bitrate],
            outputs=[video_bitrate]
        )

    convert_button = gr.Button("Convert Now", variant="primary")

    gr.Markdown("### **Conversion Preview**")
    video_preview = gr.Video(label="Preview Output")

    gr.Markdown("### **Download Your Masterpiece**")
    file_download = gr.File(label="Download Result")

    convert_button.click(
        process_conversion,
        inputs=[
            use_youtube, youtube_url, video_file,
            downscale, faster, use_mp3, audio_only,
            custom_bitrate, video_bitrate
        ],
        outputs=[video_preview, file_download]
    )

demo.launch()