app.py

import gradio as gr
import subprocess
import os
import zipfile
import shutil
import uuid

def video_to_frames(video, fps):
    uid = str(uuid.uuid4())
    out_dir = f"frames_{uid}"
    os.makedirs(out_dir, exist_ok=True)

    output_pattern = os.path.join(out_dir, "frame_%06d.png")

    if fps == 0:
        cmd = [
            "ffmpeg",
            "-i", video,
            "-vsync", "0",
            output_pattern
        ]
    else:
        cmd = [
            "ffmpeg",
            "-i", video,
            "-vf", f"fps={fps}",
            "-vsync", "0",
            output_pattern
        ]

    subprocess.run(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)

    zip_path = f"{out_dir}.zip"
    with zipfile.ZipFile(zip_path, 'w', zipfile.ZIP_DEFLATED) as zipf:
        for root, _, files in os.walk(out_dir):
            for file in files:
                zipf.write(os.path.join(root, file), arcname=file)

    shutil.rmtree(out_dir)
    return zip_path


with gr.Blocks() as demo:
    gr.Markdown("### video → image sequence (lossless)\nno quality loss.")

    video = gr.Video(label="upload video")
    fps = gr.Slider(0, 60, step=1, value=0, label="fps (0 = original fps)")
    out = gr.File(label="download frames (.zip)")

    btn = gr.Button("extract frames")
    btn.click(video_to_frames, inputs=[video, fps], outputs=out)

demo.launch()