---
license: apache-2.0
library_name: diffusers
pipeline_tag: image-to-video
tags:
  - wan
  - video-generation
  - image-to-video
  - diffusers
base_model: alibaba-pai/Wan2.1-Fun-V1.1-1.3B-InP
---

# Wan2.1-Fun-V1.1-1.3B-InP (Diffusers)

This is a diffusers-format conversion of [alibaba-pai/Wan2.1-Fun-V1.1-1.3B-InP](https://huggingface.co/alibaba-pai/Wan2.1-Fun-V1.1-1.3B-InP) (Wan-Fun Inpaint V1.1 1.3B) from VideoX-Fun format.

## Model Details

- **Architecture**: WanTransformer3DModel with `in_channels=36` (16 noise + 4 mask + 16 image latent)
- **Parameters**: 1.3B
- **Pipeline**: `WanImageToVideoPipeline` (standard diffusers, no patching required)
- **Resolution**: 480x832 (480p) recommended
- **Frames**: 49 frames at 16fps (~3 seconds)

This model has the same I2V architecture as the official [Wan2.1-I2V-14B-480P](https://huggingface.co/Wan-AI/Wan2.1-I2V-14B-480P-Diffusers) (`in_channels=36`), but at 1.3B scale.

## Usage

```python
import torch
from diffusers import WanImageToVideoPipeline
from PIL import Image

pipe = WanImageToVideoPipeline.from_pretrained(
    "engineerA314/Wan2.1-Fun-V1.1-1.3B-InP-Diffusers",
    torch_dtype=torch.bfloat16,
)
pipe.enable_sequential_cpu_offload()

image = Image.open("first_frame.png").convert("RGB")

output = pipe(
    image=image,
    prompt="A person is talking naturally",
    negative_prompt="static, blurred, low quality",
    height=480,
    width=832,
    num_frames=49,
    num_inference_steps=50,
    guidance_scale=5.0,
)

from diffusers.utils import export_to_video
export_to_video(output.frames[0], "output.mp4", fps=16)
```

## Conversion Details

Converted from VideoX-Fun format using 1:1 weight key mapping (983 keys). No architectural modifications were needed -- the standard `WanImageToVideoPipeline` handles `in_channels=36` natively.

### Components

| Component | Source |
|-----------|--------|
| Transformer | Converted from `alibaba-pai/Wan2.1-Fun-V1.1-1.3B-InP` |
| VAE | `Wan-AI/Wan2.1-T2V-1.3B-Diffusers` |
| Text Encoder | `Wan-AI/Wan2.1-T2V-1.3B-Diffusers` (UMT5-XXL) |
| Image Encoder | `Wan-AI/Wan2.1-I2V-14B-480P-Diffusers` (CLIP ViT-H-14) |
| Scheduler | UniPCMultistepScheduler (`flow_shift=3.0`) |

### Comparison with TI2V variant

| | This model (InP) | [TI2V](https://huggingface.co/engineerA314/Wan2.1-Fun-V1.1-1.3B-TI2V-Diffusers) |
|---|---|---|
| `in_channels` | 36 (noise + mask + image) | 32 (noise + image) |
| Pipeline patches | None needed | `prepare_latents` override required |
| Origin | Wan-Fun Inpaint | Wan-Fun Camera Control (adapter removed) |

## Acknowledgements

- [Alibaba PAI / VideoX-Fun](https://github.com/alibaba-pai/VideoX-Fun) for the original Wan-Fun models
- [Wan-Video](https://github.com/Wan-Video/Wan2.1) for the Wan 2.1 architecture