app_lora.py

import os
import spaces
import torch
from diffusers import AutoencoderKLWan, WanImageToVideoPipeline, UniPCMultistepScheduler
from diffusers.utils import export_to_video
from transformers import CLIPVisionModel
import gradio as gr
import tempfile

from huggingface_hub import hf_hub_download
import numpy as np
from PIL import Image
import random

MODEL_ID = "Wan-AI/Wan2.1-I2V-14B-480P-Diffusers"

LORA_REPO_ID = "vrgamedevgirl84/Wan14BT2VFusioniX"
LORA_FILENAME = "FusionX_LoRa/Wan2.1_I2V_14B_FusionX_LoRA.safetensors"
#LORA_FILENAME = "Wan14Bi2vFusioniX_fp16.safetensors"

image_encoder = CLIPVisionModel.from_pretrained(MODEL_ID, subfolder="image_encoder", torch_dtype=torch.float32)
vae = AutoencoderKLWan.from_pretrained(MODEL_ID, subfolder="vae", torch_dtype=torch.float32)
pipe = WanImageToVideoPipeline.from_pretrained(
    MODEL_ID, vae=vae, image_encoder=image_encoder, torch_dtype=torch.bfloat16
)
pipe.scheduler = UniPCMultistepScheduler.from_config(pipe.scheduler.config, flow_shift=8.0)
pipe.to("cuda")

try:
    causvid_path = hf_hub_download(repo_id=LORA_REPO_ID, filename=LORA_FILENAME)
    print("✅ LoRA downloaded to:", causvid_path)

    pipe.load_lora_weights(causvid_path, adapter_name="causvid_lora")
    pipe.set_adapters(["causvid_lora"], adapter_weights=[0.75])
    pipe.fuse_lora()

except Exception as e:
    import traceback
    print("❌ Error during LoRA loading:")
    traceback.print_exc()

MOD_VALUE = 32
DEFAULT_H_SLIDER_VALUE = 640
DEFAULT_W_SLIDER_VALUE = 1024
NEW_FORMULA_MAX_AREA = 640.0 * 1024.0 

SLIDER_MIN_H, SLIDER_MAX_H = 128, 1024
SLIDER_MIN_W, SLIDER_MAX_W = 128, 1024
MAX_SEED = np.iinfo(np.int32).max

FIXED_FPS = 24
MIN_FRAMES_MODEL = 8
MAX_FRAMES_MODEL = 81 

default_prompt_i2v = "make this image come alive, cinematic motion, smooth animation"
default_negative_prompt = "Bright tones, overexposed, static, blurred details, subtitles, style, works, paintings, images, static, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, misshapen limbs, fused fingers, still picture, messy background, three legs, many people in the background, walking backwards, watermark, text, signature"


HF_MODEL = os.environ.get("HF_UPLOAD_REPO", "rahul7star/VideoExplain")
from huggingface_hub import HfApi, upload_file
import os
import uuid
import logging

import os
import uuid
import logging
from datetime import datetime
from huggingface_hub import HfApi, upload_file
import subprocess
import tempfile
import logging
import shutil
import os
from huggingface_hub import HfApi, upload_file
from datetime import datetime
import uuid

HF_MODEL = os.environ.get("HF_UPLOAD_REPO", "rahul7star/VideoExplain")

def upscale_and_upload_4k(input_video_path: str, summary_text: str) -> str:
    """
    Upscale a video to 4K and upload it to Hugging Face Hub without replacing the original file.

    Args:
        input_video_path (str): Path to the original video.
        summary_text (str): Text summary to upload alongside the video.

    Returns:
        str: Hugging Face folder path where the video and summary were uploaded.
    """
    logging.info(f"Upscaling video to 4K for upload: {input_video_path}")

    # Create a temporary file for the upscaled video
    with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as tmp_upscaled:
        upscaled_path = tmp_upscaled.name

    # FFmpeg upscale command
    cmd = [
        "ffmpeg",
        "-i", input_video_path,
        "-vf", "scale=3840:2160:flags=lanczos",
        "-c:v", "libx264",
        "-crf", "18",
        "-preset", "slow",
        "-y",
        upscaled_path,
    ]
    try:
        subprocess.run(cmd, check=True, capture_output=True)
        logging.info(f"✅ Upscaled video created at: {upscaled_path}")
    except subprocess.CalledProcessError as e:
        logging.error(f"FFmpeg failed:\n{e.stderr.decode()}")
        raise

    # Create a date-based folder on HF
    today_str = datetime.now().strftime("%Y-%m-%d")
    unique_subfolder = f"Upload-4K-{uuid.uuid4().hex[:8]}"
    hf_folder = f"{today_str}/{unique_subfolder}"

    # Upload video
    video_filename = os.path.basename(input_video_path)
    video_hf_path = f"{hf_folder}/{video_filename}"
    upload_file(
        path_or_fileobj=upscaled_path,
        path_in_repo=video_hf_path,
        repo_id=HF_MODEL,
        repo_type="model",
        token=os.environ.get("HUGGINGFACE_HUB_TOKEN"),
    )
    logging.info(f"✅ Uploaded 4K video to HF: {video_hf_path}")

    # Upload summary.txt
    summary_file = tempfile.NamedTemporaryFile(delete=False, suffix=".txt").name
    with open(summary_file, "w", encoding="utf-8") as f:
        f.write(summary_text)

    summary_hf_path = f"{hf_folder}/summary.txt"
    upload_file(
        path_or_fileobj=summary_file,
        path_in_repo=summary_hf_path,
        repo_id=HF_MODEL,
        repo_type="model",
        token=os.environ.get("HUGGINGFACE_HUB_TOKEN"),
    )
    logging.info(f"✅ Uploaded summary to HF: {summary_hf_path}")

    # Cleanup temporary files
    os.remove(upscaled_path)
    os.remove(summary_file)

    return hf_folder

def upload_to_hf(video_path, summary_text):
    api = HfApi()
    
    # Create a date-based folder (YYYY-MM-DD)
    today_str = datetime.now().strftime("%Y-%m-%d")
    date_folder = today_str
    
    # Generate a unique subfolder for this upload
    unique_subfolder = f"Wan21-I2V-upload_{uuid.uuid4().hex[:8]}"
    hf_folder = f"{date_folder}/{unique_subfolder}"
    logging.info(f"Uploading files to HF folder: {hf_folder} in repo {HF_MODEL}")

    # Upload video
    video_filename = os.path.basename(video_path)
    video_hf_path = f"{hf_folder}/{video_filename}"
    upload_file(
        path_or_fileobj=video_path,
        path_in_repo=video_hf_path,
        repo_id=HF_MODEL,
        repo_type="model",
        token=os.environ.get("HUGGINGFACE_HUB_TOKEN"),
    )
    logging.info(f"✅ Uploaded video to HF: {video_hf_path}")

    # Upload summary.txt
    summary_file = "/tmp/summary.txt"
    with open(summary_file, "w", encoding="utf-8") as f:
        f.write(summary_text)

    summary_hf_path = f"{hf_folder}/summary.txt"
    upload_file(
        path_or_fileobj=summary_file,
        path_in_repo=summary_hf_path,
        repo_id=HF_MODEL,
        repo_type="model",
        token=os.environ.get("HUGGINGFACE_HUB_TOKEN"),
    )
    logging.info(f"✅ Uploaded summary to HF: {summary_hf_path}")

    return hf_folder


def _calculate_new_dimensions_wan(pil_image, mod_val, calculation_max_area,
                                 min_slider_h, max_slider_h,
                                 min_slider_w, max_slider_w,
                                 default_h, default_w):
    orig_w, orig_h = pil_image.size
    if orig_w <= 0 or orig_h <= 0:
        return default_h, default_w

    aspect_ratio = orig_h / orig_w
    
    calc_h = round(np.sqrt(calculation_max_area * aspect_ratio))
    calc_w = round(np.sqrt(calculation_max_area / aspect_ratio))

    calc_h = max(mod_val, (calc_h // mod_val) * mod_val)
    calc_w = max(mod_val, (calc_w // mod_val) * mod_val)
    
    new_h = int(np.clip(calc_h, min_slider_h, (max_slider_h // mod_val) * mod_val))
    new_w = int(np.clip(calc_w, min_slider_w, (max_slider_w // mod_val) * mod_val))
    
    return new_h, new_w

def handle_image_upload_for_dims_wan(uploaded_pil_image, current_h_val, current_w_val):
    if uploaded_pil_image is None:
        return gr.update(value=DEFAULT_H_SLIDER_VALUE), gr.update(value=DEFAULT_W_SLIDER_VALUE)
    try:
        new_h, new_w = _calculate_new_dimensions_wan(
            uploaded_pil_image, MOD_VALUE, NEW_FORMULA_MAX_AREA,
            SLIDER_MIN_H, SLIDER_MAX_H, SLIDER_MIN_W, SLIDER_MAX_W,
            DEFAULT_H_SLIDER_VALUE, DEFAULT_W_SLIDER_VALUE
        )
        return gr.update(value=new_h), gr.update(value=new_w)
    except Exception as e:
        gr.Warning("Error attempting to calculate new dimensions")
        return gr.update(value=DEFAULT_H_SLIDER_VALUE), gr.update(value=DEFAULT_W_SLIDER_VALUE)

def get_duration(input_image, prompt, height, width, 
                   negative_prompt, duration_seconds,
                   guidance_scale, steps,
                   seed, randomize_seed, 
                   progress):
    if steps > 4 and duration_seconds > 2:
        return 90
    elif steps > 4 or duration_seconds > 2:
        return 75
    else:
        return 60

@spaces.GPU(duration=get_duration)
def generate_video(input_image, prompt, height, width, 
                   negative_prompt=default_negative_prompt, duration_seconds = 2,
                   guidance_scale = 1, steps = 4,
                   seed = 42, randomize_seed = False, 
                   progress=gr.Progress(track_tqdm=True)):
    
    if input_image is None:
        raise gr.Error("Please upload an input image.")

    target_h = max(MOD_VALUE, (int(height) // MOD_VALUE) * MOD_VALUE)
    target_w = max(MOD_VALUE, (int(width) // MOD_VALUE) * MOD_VALUE)
    
    num_frames = np.clip(int(round(duration_seconds * FIXED_FPS)), MIN_FRAMES_MODEL, MAX_FRAMES_MODEL)
    
    current_seed = random.randint(0, MAX_SEED) if randomize_seed else int(seed)

    resized_image = input_image.resize((target_w, target_h))

    with torch.inference_mode():
        output_frames_list = pipe(
            image=resized_image, prompt=prompt, negative_prompt=negative_prompt,
            height=target_h, width=target_w, num_frames=num_frames,
            guidance_scale=float(guidance_scale), num_inference_steps=int(steps),
            generator=torch.Generator(device="cuda").manual_seed(current_seed)
        ).frames[0]

    with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as tmpfile:
        video_path = tmpfile.name
    export_to_video(output_frames_list, video_path, fps=FIXED_FPS)
    upscale_and_upload_4k(video_path, prompt)
    return video_path, current_seed

with gr.Blocks() as demo:
    gr.Markdown("# Fast 4 steps Wan 2.1 I2V (14B) fusionx-lora")
    #gr.Markdown("[CausVid](https://github.com/tianweiy/CausVid) is a distilled version of Wan 2.1 to run faster in just 4-8 steps, [extracted as LoRA by Kijai](https://huggingface.co/Kijai/WanVideo_comfy/blob/main/Wan21_CausVid_14B_T2V_lora_rank32.safetensors) and is compatible with 🧨 diffusers")
    with gr.Row():
        with gr.Column():
            input_image_component = gr.Image(type="pil", label="Input Image (auto-resized to target H/W)")
            prompt_input = gr.Textbox(label="Prompt", value=default_prompt_i2v)
            duration_seconds_input = gr.Slider(minimum=round(MIN_FRAMES_MODEL/FIXED_FPS,1), maximum=round(MAX_FRAMES_MODEL/FIXED_FPS,1), step=0.1, value=2, label="Duration (seconds)", info=f"Clamped to model's {MIN_FRAMES_MODEL}-{MAX_FRAMES_MODEL} frames at {FIXED_FPS}fps.")
            
            with gr.Accordion("Advanced Settings", open=False):
                negative_prompt_input = gr.Textbox(label="Negative Prompt", value=default_negative_prompt, lines=3)
                seed_input = gr.Slider(label="Seed", minimum=0, maximum=MAX_SEED, step=1, value=42, interactive=True)
                randomize_seed_checkbox = gr.Checkbox(label="Randomize seed", value=True, interactive=True)
                with gr.Row():
                    height_input = gr.Slider(minimum=SLIDER_MIN_H, maximum=SLIDER_MAX_H, step=MOD_VALUE, value=DEFAULT_H_SLIDER_VALUE, label=f"Output Height (multiple of {MOD_VALUE})")
                    width_input = gr.Slider(minimum=SLIDER_MIN_W, maximum=SLIDER_MAX_W, step=MOD_VALUE, value=DEFAULT_W_SLIDER_VALUE, label=f"Output Width (multiple of {MOD_VALUE})")
                steps_slider = gr.Slider(minimum=1, maximum=30, step=1, value=4, label="Inference Steps") 
                guidance_scale_input = gr.Slider(minimum=0.0, maximum=20.0, step=0.5, value=1.0, label="Guidance Scale", visible=False)

            generate_button = gr.Button("Generate Video", variant="primary")
        with gr.Column():
            video_output = gr.Video(label="Generated Video", autoplay=True, interactive=False)

    input_image_component.upload(
        fn=handle_image_upload_for_dims_wan,
        inputs=[input_image_component, height_input, width_input],
        outputs=[height_input, width_input]
    )
    
    input_image_component.clear( 
        fn=handle_image_upload_for_dims_wan,
        inputs=[input_image_component, height_input, width_input],
        outputs=[height_input, width_input]
    )
    
    ui_inputs = [
        input_image_component, prompt_input, height_input, width_input,
        negative_prompt_input, duration_seconds_input,
        guidance_scale_input, steps_slider, seed_input, randomize_seed_checkbox
    ]
    generate_button.click(fn=generate_video, inputs=ui_inputs, outputs=[video_output, seed_input])

    gr.Examples(
        examples=[ 
            ["peng.png", "a penguin playfully dancing in the snow, Antarctica", 896, 512],
            ["forg.jpg", "the frog jumps around", 448, 832],
        ],
        inputs=[input_image_component, prompt_input, height_input, width_input], outputs=[video_output, seed_input], fn=generate_video, cache_examples="lazy"
    )

if __name__ == "__main__":
    demo.queue().launch()