import torch
from diffusers.utils import export_to_video, load_image
from diffusers import AutoencoderKLWan, WanImageToVideoPipeline
from transformers import CLIPVisionModel
import numpy as np

model_id = "Wan-AI/Wan2.1-I2V-14B-720P-Diffusers"
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.to("cuda")

pipe.load_lora_weights("starsfriday/Wan2.1-Mecha-LoRA")

pipe.enable_model_cpu_offload() #for low-vram environments

prompt = "gangtiexia，背景保持不变，这个人开始变身红色机甲，变身过程中出现机甲面罩遮住脸部，变身完成之后这个人向前走."

image = load_image("https://huggingface.co/starsfriday/Wan2.1-Mecha-LoRA/blob/main/result/test.jpg")

max_area = 512 * 768
aspect_ratio = image.height / image.width
mod_value = pipe.vae_scale_factor_spatial * pipe.transformer.config.patch_size[1]
height = round(np.sqrt(max_area * aspect_ratio)) // mod_value * mod_value
width = round(np.sqrt(max_area / aspect_ratio)) // mod_value * mod_value
image = image.resize((width, height))

output = pipe(
    image=image,
    prompt=prompt,
    height=height,
    width=width,
    num_frames=81,
    guidance_scale=5.0,
    num_inference_steps=25
).frames[0]
export_to_video(output, "output.mp4", fps=16)

Recommended Settings

LoRA Strength: 1.0
Embedded Guidance Scale: 6.0
Flow Shift: 5.0

Trigger Words

The key trigger phrase is: gangtiexia

Prompt Template

For best results, use this prompt structure:

gangtiexia，背景保持不变，这个人开始变身[color]色机甲，变身过程中出现机甲面罩遮住脸部，变身完成之后这个人向前走

Simply replace [color] with whatever you want to let this person transform into the color of a mecha