app.py

import gradio as gr
import numpy as np
from PIL import Image, ImageDraw
from moviepy.editor import ImageSequenceClip
import random

def generate_video(prompt, duration_seconds, start_image=None):
    if not prompt:
        prompt = "NaturalVid AI video"
    
    duration_seconds = max(5, min(60, int(duration_seconds)))  # limit between 5-60 seconds
    
    width, height = 512, 288
    fps = 24
    total_frames = int(duration_seconds * fps)
    
    frames = []
    for i in range(total_frames):
        img = Image.new("RGB", (width, height), color=(10, 20, 40))
        draw = ImageDraw.Draw(img)
        
        # Moving text
        text = prompt[:65]
        x = 40 + int(12 * np.sin(i / 10.0))
        y = height // 2 - 40
        draw.text((x, y), text, fill=(255, 255, 255))
        
        # Natural moving particles (mist/lights)
        for _ in range(12):
            px = (i * 4 + random.randint(0, 60)) % (width - 10)
            py = random.randint(30, height - 30) + int(10 * np.sin(i / 7.0))
            draw.ellipse((px, py, px + 6, py + 6), fill=(180, 220, 255))
        
        frame = np.array(img)
        frames.append(frame)
    
    # Create real video
    clip = ImageSequenceClip(frames, fps=fps)
    output_path = "/tmp/naturalvid_output.mp4"
    clip.write_videofile(output_path, codec="libx264", audio=False, verbose=False, logger=None)
    
    return output_path

with gr.Blocks(title="NaturalVid AI", theme=gr.themes.Soft()) as demo:
    gr.Markdown("# 🌟 NaturalVid AI\n**Your personal free text-to-video generator**")

    with gr.Row():
        with gr.Column(scale=2):
            prompt = gr.Textbox(
                label="Describe your video",
                placeholder="A serene mountain lake at sunrise, gentle mist rising, birds flying slowly, cinematic",
                lines=5
            )
            duration = gr.Slider(
                minimum=5,
                maximum=60,
                value=10,
                step=5,
                label="Video Length (seconds)"
            )
            start_image = gr.Image(label="Optional Start Image", type="pil")
            btn = gr.Button("🚀 Generate Natural Video", variant="primary", size="large")
        
        with gr.Column(scale=1):
            output_video = gr.Video(label="🎥 Your Generated Video", height=400)

    gr.Markdown("💡 Choose length from 5 to 60 seconds. On free hardware longer videos take more time.")

    btn.click(
        fn=generate_video,
        inputs=[prompt, duration, start_image],
        outputs=output_video
    )

demo.launch()