app.py

import gradio as gr
from loadimg import load_img
import spaces
from transformers import AutoModelForImageSegmentation
import torch
from torchvision import transforms
import moviepy.editor as mp
from pydub import AudioSegment
from PIL import Image
import numpy as np
import os
import tempfile
import uuid

torch.set_float32_matmul_precision(["high", "highest"][0])

birefnet = AutoModelForImageSegmentation.from_pretrained(
    "ZhengPeng7/BiRefNet", trust_remote_code=True
)
birefnet.to("cuda")
transform_image = transforms.Compose(
    [
        transforms.Resize((1024, 1024)),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]),
    ]
)


@spaces.GPU
def fn(vid, bg_type="Color", bg_image=None, bg_video=None, color="#00FF00", fps=0, video_handling="slow_down"):
    try:
        # Load the video using moviepy
        video = mp.VideoFileClip(vid)

        # Load original fps if fps value is equal to 0
        if fps == 0:
            fps = video.fps

        # Extract audio from the video
        audio = video.audio

        # Extract frames at the specified FPS
        frames = video.iter_frames(fps=fps)

        # Process each frame for background removal
        processed_frames = []
        yield gr.update(visible=True), gr.update(visible=False)

        if bg_type == "Video":
            background_video = mp.VideoFileClip(bg_video)
            if background_video.duration < video.duration:
                if video_handling == "slow_down":
                    background_video = background_video.fx(mp.vfx.speedx, factor=video.duration / background_video.duration)
                else:  # video_handling == "loop"
                    background_video = mp.concatenate_videoclips([background_video] * int(video.duration / background_video.duration + 1))
            background_frames = background_video.iter_frames(fps=fps)
        else:
            background_frames = None

        for i, frame in enumerate(frames):
            pil_image = Image.fromarray(frame)
            if bg_type == "Color":
                processed_image = process(pil_image, color)
            elif bg_type == "Image":
                processed_image = process(pil_image, bg_image)
            elif bg_type == "Video":
                try:
                    background_frame = next(background_frames)
                    background_image = Image.fromarray(background_frame)
                    processed_image = process(pil_image, background_image)
                except StopIteration:
                    # Handle case where background video is shorter than input video
                    processed_image = process(pil_image, "#000000")  # Default to black background
            else:
                processed_image = pil_image  # Default to original image if no background is selected

            processed_frames.append(np.array(processed_image))
            yield processed_image, None

        # Create a new video from the processed frames
        processed_video = mp.ImageSequenceClip(processed_frames, fps=fps)

        # Add the original audio back to the processed video
        processed_video = processed_video.set_audio(audio)

        # Save the processed video to a temporary file
        temp_dir = "temp"
        os.makedirs(temp_dir, exist_ok=True)
        unique_filename = str(uuid.uuid4()) + ".mp4"
        temp_filepath = os.path.join(temp_dir, unique_filename)
        processed_video.write_videofile(temp_filepath, codec="libx264")

        yield gr.update(visible=False), gr.update(visible=True)
        # Return the path to the temporary file
        yield processed_image, temp_filepath

    except Exception as e:
        print(f"Error: {e}")
        yield gr.update(visible=False), gr.update(visible=True)
        yield None, f"Error processing video: {e}"



def process(image, bg):
    image_size = image.size
    input_images = transform_image(image).unsqueeze(0).to("cuda")
    # Prediction
    with torch.no_grad():
        preds = birefnet(input_images)[-1].sigmoid().cpu()
    pred = preds[0].squeeze()
    pred_pil = transforms.ToPILImage()(pred)
    mask = pred_pil.resize(image_size)

    if isinstance(bg, str) and bg.startswith("#"):
        color_rgb = tuple(int(bg[i:i+2], 16) for i in (1, 3, 5))
        background = Image.new("RGBA", image_size, color_rgb + (255,))
    elif isinstance(bg, Image.Image):
        background = bg.convert("RGBA").resize(image_size)
    else:
        background = Image.new("RGBA", image_size, (0, 0, 0, 255))  # Default to black background

    # Composite the image onto the background using the mask
    image = Image.composite(image, background, mask)

    return image


with gr.Blocks(theme=gr.themes.Ocean()) as demo:
    with gr.Row():
        in_video = gr.Video(label="Input Video")
        stream_image = gr.Image(label="Streaming Output", visible=False)
        out_video = gr.Video(label="Final Output Video")
    submit_button = gr.Button("Change Background")
    with gr.Row():
        fps_slider = gr.Slider(
            minimum=0,
            maximum=60,
            step=1,
            value=0,
            label="Output FPS (0 will inherit the original fps value)",
        )
        bg_type = gr.Radio(["Color", "Image", "Video"], label="Background Type", value="Color")
        color_picker = gr.ColorPicker(label="Background Color", value="#00FF00", visible=True)
        bg_image = gr.Image(label="Background Image", type="filepath", visible=False)
        bg_video = gr.Video(label="Background Video", visible=False)
        with gr.Column(visible=False) as video_handling_options:
            video_handling_radio = gr.Radio(["slow_down", "loop"], label="Video Handling", value="slow_down")

    def update_visibility(bg_type):
        if bg_type == "Color":
            return gr.update(visible=True), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False)
        elif bg_type == "Image":
            return gr.update(visible=False), gr.update(visible=True), gr.update(visible=False), gr.update(visible=False)
        elif bg_type == "Video":
            return gr.update(visible=False), gr.update(visible=False), gr.update(visible=True), gr.update(visible=True)
        else:
            return gr.update(visible=False), gr.update(visible=False), gr.update(visible=False), gr.update(visible=False)


    bg_type.change(update_visibility, inputs=bg_type, outputs=[color_picker, bg_image, bg_video, video_handling_options])


    examples = gr.Examples(
        [
            ["rickroll-2sec.mp4", "Image", "images.webp", None],
            ["rickroll-2sec.mp4", "Color", None, None],
            ["rickroll-2sec.mp4", "Video", None, "background.mp4"] 
        ],
        inputs=[in_video, bg_type, bg_image, bg_video],
        outputs=[stream_image, out_video],
        fn=fn,
        cache_examples=True,
        cache_mode="eager",
    )


    submit_button.click(
        fn,
        inputs=[in_video, bg_type, bg_image, bg_video, color_picker, fps_slider, video_handling_radio],
        outputs=[stream_image, out_video],
    )

if __name__ == "__main__":
    demo.launch(show_error=True)