DreamVideo-Omni: Omni-Motion Controlled Multi-Subject Video Customization with Latent Identity Reinforcement Learning

Yujie Wei¹, Xinyu Liu², Shiwei Zhang³, Hangjie Yuan⁴, Jinbo Xing³, Zhekai Chen⁵, Xiang Wang³, Haonan Qiu⁶, Rui Zhao⁷, Yutong Feng³, Ruihang Chu³, Yingya Zhang³, Yike Guo², Xihui Liu⁵, Hongming Shan¹

¹Fudan University   ²The Hong Kong University of Science and Technology   ³Tongyi Lab, Alibaba Group
⁴Zhejiang University   ⁵MMLab, The University of Hong Kong
⁶Nanyang Technological University   ⁷National University of Singapore

Abstract

While large-scale diffusion models have revolutionized video synthesis, achieving precise control over both multi-subject identity and multi-granularity motion remains a significant challenge. Recent attempts to bridge this gap often suffer from limited motion granularity, control ambiguity, and identity degradation, leading to suboptimal performance on identity preservation and motion control. In this work, we present DreamVideo-Omni, a unified framework enabling harmonious multi-subject customization with omni-motion control via a progressive two-stage training paradigm. In the first stage, we integrate comprehensive control signals for joint training, encompassing subject appearances, global motion, local dynamics, and camera movements. To ensure robust and precise controllability, we introduce a condition-aware 3D rotary positional embedding to coordinate heterogeneous inputs and a hierarchical motion injection strategy to enhance global motion guidance. Furthermore, to resolve multi-subject ambiguity, we introduce group and role embeddings to explicitly anchor motion signals to specific identities, effectively disentangling complex scenes into independent controllable instances. In the second stage, to mitigate identity degradation, we design a latent identity reward feedback learning paradigm by training a latent identity reward model upon a pre-trained video diffusion backbone. This provides motion-aware identity rewards in the latent space, prioritizing identity preservation aligned with human preferences. Supported by our curated large-scale dataset and the comprehensive DreamOmni Bench for multi-subject and omni-motion control evaluation, DreamVideo-Omni demonstrates superior performance in generating high-quality videos with precise controllability. Project page: https://dreamvideo-omni.github.io.

🔥 Updates

• [2026.05]: Release the inference code and SFT checkpoint.
• [2026.03]: Release the paper of DreamVideo-Omni.

⚙️ Preparation

1. Requirements & Installation

conda create -n dreamvideo-omni python=3.10 -y
conda activate dreamvideo-omni
pip install -e .

2. Download Weights

DreamVideo-Omni DiT (SFT) checkpoint

Download dreamvideo_omni_sft.safetensors (~2.8 GB) to:

checkpoints/dreamvideo_omni_sft.safetensors

Hugging Face

huggingface-cli download weilllllls/DreamVideo-Omni dreamvideo_omni_sft.safetensors \
  --local-dir ./checkpoints

ModelScope

modelscope download --model weilllllls/DreamVideo-Omni \
  dreamvideo_omni_sft.safetensors --local_dir ./checkpoints

Wan2.1-T2V-1.3B base weights

Required for text encoder, VAE, and tokenizer. If not pre-downloaded, they will be fetched automatically from ModelScope on the first inference run.

Hugging Face

huggingface-cli download Wan-AI/Wan2.1-T2V-1.3B \
  --local-dir ./models/Wan-AI/Wan2.1-T2V-1.3B

ModelScope

modelscope download --model Wan-AI/Wan2.1-T2V-1.3B \
  --local_dir ./models/Wan-AI/Wan2.1-T2V-1.3B

Use local weights without re-downloading

If you already have Wan base weights locally:

export LOCAL_MODEL_PATH=/path/to/pretrain_models_ckpt
export SKIP_DOWNLOAD=1

Then pass --skip_download to infer.py, or set SKIP_DOWNLOAD=1 when running the shell scripts.

💫 Inference

Video generation is performed via infer.py. Each example case under examples/ contains a metadata.json with caption, reference images, bounding boxes, and/or trajectories.

Three example cases

Case	Directory	Control type	Seed
0	examples/0	Multi-reference — two reference images, text prompt only (no tracks / bbox)	555362
1	examples/1	Motion — trajectory + per-frame frames_info bbox (no reference image)	42
2	examples/2	Identity + motion — one reference image + trajectory + per-frame bbox	45

Commands

Case 0 — multi-reference

CUDA_VISIBLE_DEVICES=0 python infer.py \
  --checkpoint ./checkpoints/dreamvideo_omni_sft.safetensors \
  --local_model_path ./models \
  --case_dir examples/0 \
  --output_path outputs/0.mp4 \
  --num_inference_steps 50 \
  --seed 555362 \
  --skip_download

Case 1 — motion (tracks + bbox)

CUDA_VISIBLE_DEVICES=1 python infer.py \
  --checkpoint ./checkpoints/dreamvideo_omni_sft.safetensors \
  --local_model_path ./models \
  --case_dir examples/1 \
  --output_path outputs/1.mp4 \
  --num_inference_steps 50 \
  --seed 42 \
  --skip_download

Case 2 — identity + motion (ref + tracks + bbox)

CUDA_VISIBLE_DEVICES=2 python infer.py \
  --checkpoint ./checkpoints/dreamvideo_omni_sft.safetensors \
  --local_model_path ./models \
  --case_dir examples/2 \
  --output_path outputs/2.mp4 \
  --num_inference_steps 50 \
  --seed 45 \
  --skip_download

Notes:

• Each case folder contains metadata.json (caption, paths to assets, optional frames_info).
• frames_info supplies per-frame bounding boxes; mask PNGs are optional via paths.masks.
• ref_imgs[].obj_id and bbox obj_id should use consistent sort order for multi-object setups.

Acknowledgements

This code is built on top of DiffSynth-Studio and Wan2.1. We thank the authors for their great work.

🌟 Citation

If you find this code useful for your research, please cite our paper:

@article{wei2026dreamvideo_omni,
  title={DreamVideo-Omni: Omni-Motion Controlled Multi-Subject Video Customization with Latent Identity Reinforcement Learning},
  author={Wei, Yujie and Liu, Xinyu and Zhang, Shiwei and Yuan, Hangjie and Xing, Jinbo and Chen, Zhekai and Wang, Xiang and Qiu, Haonan and Zhao, Rui and Feng, Yutong and Chu, Ruihang and Zhang, Yingya and Guo, Yike and Liu, Xihui and Shan, Hongming},
  journal={arXiv preprint arXiv:2603.12257},
  year={2026}
}