Warp-as-History: Generalizable Camera-Controlled Video Generation from One Training Video

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Summary

Warp-as-History proposes a novel interface that transforms camera-induced warps into pseudo-history representations, enabling a frozen video generation model to follow camera trajectories without training or test-time optimization. A lightweight LoRA fine-tuning on a single video further improves camera adherence and generalizes to unseen videos.

Camera-controlled video generation has made substantial progress, enabling generated videos to follow prescribed viewpoint trajectories. However, existing methods usually learn camera-specific conditioning through camera encoders, control branches, or attention and positional-encoding modifications, which often require post-training on large-scale camera-annotated videos. Training-free alternatives avoid such post-training, but often shift the cost to test-time optimization or extra denoising-time guidance. We propose Warp-as-History, a simple interface that turns camera-induced warps into camera-warped pseudo-history with target-frame positional alignment and visible-token selection. Given a target camera trajectory, we construct camera-warped pseudo-history from past observations and feed it through the model's visual-history pathway. Crucially, we align its positional encoding with the target frames being denoised and remove warped-history tokens without valid source observations. Without any training, architectural modification, or test-time optimization, this interface reveals a non-trivial zero-shot capability of a frozen video generation model to follow camera trajectories. Moreover, lightweight offline LoRA finetuning on only one camera-annotated video further improves this capability and generalizes to unseen videos, improving camera adherence, visual quality, and motion dynamics without test-time optimization or target-video adaptation. Extensive experiments on diverse datasets confirm the effectiveness of our method.
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Source: https://huggingface.co/papers/2605.15182

Abstract

A novel approach called Warp-as-History enables camera-controlled video generation by transforming camera-induced warps into pseudo-history representations, achieving zero-shot capability without training or test-time optimization.

Camera-controlledvideo generationhas made substantial progress, enabling generated videos to follow prescribed viewpoint trajectories. However, existing methods usually learn camera-specific conditioning through camera encoders, control branches, or attention and positional-encoding modifications, which often require post-training on large-scale camera-annotated videos. Training-free alternatives avoid such post-training, but often shift the cost to test-time optimization or extra denoising-time guidance. We propose Warp-as-History, a simple interface that turnscamera-induced warpsintocamera-warped pseudo-historywithtarget-frame positional alignmentandvisible-token selection. Given a target camera trajectory, we constructcamera-warped pseudo-historyfrom past observations and feed it through the model’svisual-history pathway. Crucially, we align itspositional encodingwith the target frames being denoised and remove warped-history tokens without valid source observations. Without any training, architectural modification, or test-time optimization, this interface reveals a non-trivialzero-shot capabilityof a frozenvideo generationmodel to follow camera trajectories. Moreover, lightweight offlineLoRA finetuningon only one camera-annotated video further improves this capability and generalizes to unseen videos, improving camera adherence, visual quality, and motion dynamics without test-time optimization or target-video adaptation. Extensive experiments on diverse datasets confirm the effectiveness of our method.

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