QWERTY: Training-Free Motion Control via Query-Warped Video Diffusion Transformers

• URL: http://arxiv.org/abs/2607.01869v1
• Date: Thu, 02 Jul 2026 08:25:38 GMT
• Title: QWERTY: Training-Free Motion Control via Query-Warped Video Diffusion Transformers
• Abstract summary: Video diffusion transformers (DiTs) generate high-fidelity and temporally coherent videos, yet motion control remains implicit.<n>We introduce QWERTY, a training-free framework that enables flexible motion control in DiTs via user-defined object warping and optical flow.<n>We find that QWERTY achieves the most effective motion control among existing training-free approaches on a recent image-to-video DiT, with performance comparable to fine-tuning-based methods.
• Score: 12.871297586071364
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Video diffusion transformers (DiTs) generate high-fidelity and temporally coherent videos, yet motion control remains implicit, primarily relying on text prompts. As a result, achieving desired motion often requires extensive prompt engineering and repeated resampling. While fine-tuning models with additional spatial prompts (e.g., bounding boxes or point trajectories) enables explicit control, it demands substantial data curation and computation, and may compromise the generative capabilities of pretrained models. Consequently, training-free motion control using such spatial prompts has been explored in U-Net-based video diffusion models, but remains largely unexplored for DiTs. We introduce QWERTY, a training-free framework that enables flexible motion control in pretrained image-to-video DiTs via user-defined object warping and optical flow. We carefully manipulate the 3D full attention of DiTs by warping the frame-invariant semantic subspace of queries. We find that the noise predicted by the query-warped DiT naturally guides the diffusion trajectory toward the desired motion, and further show that leveraging this noise as self-guidance for latent optimization improves control stability and visual quality. Experiments show that QWERTY achieves the most effective motion control among existing training-free approaches on a recent image-to-video DiT, with performance comparable to fine-tuning-based methods.

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