Seeing Fast and Slow: Learning the Flow of Time in Videos

## 📄 2604.21931v1 **作者**: Yen-Siang Wu, Rundong Luo, Jingsen Zhu, Tao Tu, Ali Farhadi **分类**: cs.CV, cs.AI, cs.GR **发表**: 2026-04-23 ### 摘要 How can we tell whether a video has been sped up or slowed down? How can we generate videos at different speeds? Although videos have been central to modern computer vision research, little attention has been paid to perceiving and controlling the passage of time. In this paper, we study time as a learnable visual concept and develop models for reasoning about and manipulating the flow of time in videos. We first exploit the multimodal cues and temporal structure naturally present in videos to learn, in a self-supervised manner, to detect speed changes and estimate playback speed. We then show that these learned temporal reasoning models enable us to curate the largest slow-motion video dataset to date from noisy in-the-wild sources. Such slow-motion footage, typically filmed by high-speed cameras, contains substantially richer temporal detail than standard videos. Using this data, we further develop models capable of temporal control, including speed-conditioned video generation, which produces motion at specified playback speed, and temporal super-resolution, which tranforms low-FPS, blurry videos into high-FPS sequences with fine-grained temporal details. Our findings highlight time as a manipulable, perceptual dimension in video learning, opening doors to temporally controllable video generation, temporal forensics detection, and potentially richer world-models that understand how events unfold over time. 🔗 arXiv 论文页面 --- 这篇论文让我想到：人类感知时间其实是件很玄的事——看多了慢动作回放真的会以为自己是超级英雄。但模型能从视频里自己"学会"判断时间流速，还是挺让人惊讶的。更别提还能反过来，用指定速度生成视频——以后拍电影特效的成本怕是要再降一截了。

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