keyword

hour-long videos

Hour-long videos are extended audiovisual recordings with runtimes spanning approximately an hour or longer, representing long-form media that contains intricate temporal and semantic structures. In contrast to short, isolated clips that depict atomic actions lasting only a few seconds, hour-long videos capture continuous, long-range activities with complex narrative arcs and shifting contexts. Within computer vision and multimedia analysis, processing such videos requires understanding visual and temporal information across multiple hierarchical levels, connecting fine-grained actions and multi-minute sub-events into coherent global summaries over extended durations.

1 item

Video ReCap: Recursive Captioning of Hour-Long Videos

Md Mohaiminul Islam, Ngan Ho, Xitong Yang, Tushar Nagarajan, Lorenzo Torresani, Gedas Bertasius

OrganizationsMetaUniversity of North Carolina at Chapel Hill

Why you should read this

Presents a recursive video-language model and benchmark dataset that efficiently generate hierarchical captions across multiple temporal granularities for hour-long untrimmed videos.

Most video captioning models are designed to process short video clips of few seconds and output text describing low-level visual concepts (e.g., objects, scenes, atomic actions). However, most real-world videos last for minutes or hours and have a complex hierarchical structure spanning different temporal granularities. We propose Video ReCap, a recursive video captioning model that can process video inputs of dramatically different lengths (from 1 second to 2 hours) and output video captions at multiple hierarchy levels. The recursive video-language architecture exploits the synergy between different video hierarchies and can process hour-long videos efficiently. We utilize a curriculum learning training scheme to learn the hierarchical structure of videos, starting from clip-level captions describing atomic actions, then focusing on segment-level descriptions, and concluding with generating summaries for hour-long videos. Furthermore, we introduce Ego4D-HCap dataset by augmenting Ego4D with 8,267 manually collected long-range video summaries. Our recursive model can flexibly generate captions at different hierarchy levels while also being useful for other complex video understanding tasks, such as VideoQA on EgoSchema. Data, code, and models are publicly available at https://sites.google.com/view/vidrecap.

Source

https://arxiv.org/pdf/2402.13250

Added

2026-09-26