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license: apache-2.0
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---
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license: apache-2.0
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---
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# β‘ FlashVSR
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**Towards Real-Time Diffusion-Based Streaming Video Super-Resolution**
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**Authors:** Junhao Zhuang, Shi Guo, Xin Cai, Xiaohui Li, Yihao Liu, Chun Yuan, Tianfan Xue
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<a href='http://zhuang2002.github.io/FlashVSR'><img src='https://img.shields.io/badge/Project-Page-Green'></a>
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<a href="https://github.com/OpenImagingLab/FlashVSR"><img src="https://img.shields.io/badge/GitHub-Repository-black?logo=github"></a>
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<a href="https://huggingface.co/JunhaoZhuang/FlashVSR"><img src="https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Model-blue"></a>
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<a href="https://huggingface.co/datasets/JunhaoZhuang/VSR-120K"><img src="https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Dataset-orange"></a>
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<a href="#"><img src="https://img.shields.io/badge/arXiv-TBD-b31b1b.svg"></a>
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**Your star means a lot for us to develop this project!** :star:
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<img src="https://raw.githubusercontent.com/OpenImagingLab/FlashVSR/main/examples/WanVSR/assert/teaser.png" />
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---
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### π Abstract
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Diffusion models have recently advanced video restoration, but applying them to real-world video super-resolution (VSR) remains challenging due to high latency, prohibitive computation, and poor generalization to ultra-high resolutions. Our goal in this work is to make diffusion-based VSR practical by achieving **efficiency, scalability, and real-time performance**. To this end, we propose **FlashVSR**, the first diffusion-based one-step streaming framework towards real-time VSR. **FlashVSR runs at βΌ17 FPS for 768 Γ 1408 videos on a single A100 GPU** by combining three complementary innovations: (i) a train-friendly three-stage distillation pipeline that enables streaming super-resolution, (ii) locality-constrained sparse attention that cuts redundant computation while bridging the trainβtest resolution gap, and (iii) a tiny conditional decoder that accelerates reconstruction without sacrificing quality. To support large-scale training, we also construct **VSR-120K**, a new dataset with 120k videos and 180k images. Extensive experiments show that FlashVSR scales reliably to ultra-high resolutions and achieves **state-of-the-art performance with up to βΌ12Γ speedup** over prior one-step diffusion VSR models.
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---
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### π° News
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- **Release Date:** October 2025 β Inference code and model weights are available now! π
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- **Coming Soon:** Dataset release (**VSR-120K**) for large-scale training.
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---
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### π TODO
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- β
Release inference code and model weights
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- β¬ Release dataset (VSR-120K)
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---
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### π Getting Started
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Follow these steps to set up and run **FlashVSR** on your local machine:
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#### 1οΈβ£ Clone the Repository
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```bash
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git clone https://github.com/OpenImagingLab/FlashVSR
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cd FlashVSR
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````
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#### 2οΈβ£ Set Up the Python Environment
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Create and activate the environment (**Python 3.11.13**):
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```bash
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conda create -n flashvsr python=3.11.13
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conda activate flashvsr
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```
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Install project dependencies:
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```bash
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pip install -e .
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pip install -r requirements.txt
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```
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#### 3οΈβ£ Install Block-Sparse Attention (Required)
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FlashVSR **requires** the **Block-Sparse Attention** backend for inference:
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```bash
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git clone https://github.com/mit-han-lab/Block-Sparse-Attention
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cd Block-Sparse-Attention
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pip install packaging
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pip install ninja
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python setup.py install
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```
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#### 4οΈβ£ Download Model Weights from Hugging Face
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Weights are hosted on **Hugging Face** via **Git LFS**. Please install Git LFS first:
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```bash
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# From the repo root
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cd examples/WanVSR
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# Install Git LFS (once per machine)
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git lfs install
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# Clone the model repository into examples/WanVSR
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git lfs clone https://huggingface.co/JunhaoZhuang/FlashVSR
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```
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After cloning, you should have:
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```
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./examples/WanVSR/FlashVSR/
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β
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βββ LQ_proj_in.ckpt
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βββ TCDecoder.ckpt
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βββ Wan2.1_VAE.pth
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βββ diffusion_pytorch_model_streaming_dmd.safetensors
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βββ README.md
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```
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> The inference scripts will load weights from `./examples/WanVSR/FlashVSR/` by default.
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#### 5οΈβ£ Run Inference
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```bash
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# From the repo root
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cd examples/WanVSR
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python infer_flashvsr_full.py # Full model
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# or
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python infer_flashvsr_tiny.py # Tiny model
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```
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---
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### π οΈ Method
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The overview of **FlashVSR**. This framework features:
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* **Three-Stage Distillation Pipeline** for streaming VSR training.
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* **Locality-Constrained Sparse Attention** to cut redundant computation and bridge the trainβtest resolution gap.
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* **Tiny Conditional Decoder** for efficient, high-quality reconstruction.
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* **VSR-120K Dataset** consisting of **120k videos** and **180k images**, supports joint training on both images and videos.
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<img src="https://raw.githubusercontent.com/OpenImagingLab/FlashVSR/main/examples/WanVSR/assert/flowchart.jpg" width="1000" />
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---
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### π€ Feedback & Support
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We welcome feedback and issues. Thank you for trying **FlashVSR**!
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---
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### π Acknowledgments
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We gratefully acknowledge the following open-source projects:
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* **DiffSynth Studio** β [https://github.com/modelscope/DiffSynth-Studio](https://github.com/modelscope/DiffSynth-Studio)
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* **Block-Sparse-Attention** β [https://github.com/mit-han-lab/Block-Sparse-Attention](https://github.com/mit-han-lab/Block-Sparse-Attention)
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* **taehv** β [https://github.com/madebyollin/taehv](https://github.com/madebyollin/taehv)
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---
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### π Contact
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* **Junhao Zhuang**
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Email: [zhuangjh23@mails.tsinghua.edu.cn](mailto:zhuangjh23@mails.tsinghua.edu.cn)
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---
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### π Citation
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```bibtex
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@misc{zhuang2025flashvsr,
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title={FLASHVSR: Towards Real-Time Diffusion-Based Streaming Video Super-Resolution},
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author={Junhao Zhuang and Shi Guo and Xin Cai and Xiaohui Li and Yihao Liu and Chun Yuan and Tianfan Xue},
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year={2025},
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archivePrefix={arXiv},
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primaryClass={cs.CV},
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note={},
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url={http://zhuang2002.github.io/FlashVSR}
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}
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```
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