arXiv Computer Vision By Toya Oyama, Rainer Lienhart, Shin'ichi Satoh

SALI: Shot-Aware Late Interaction for Cross-Shot Relation Matching in Text-to-Video Retrieval using Film-Grammar Knowledge

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SALI (Shot-Aware Late Interaction) is a new method for text-to-video retrieval that addresses the loss of relational information when videos are represented by a single embedding. It extracts the subject and object from a query sentence and matches their text embeddings against each visual shot embedding of a video clip using a greedy max or optimal transport operator, with a film-grammar penalty added during fine‑tuning. Built on CLIP4Clip‑meanP, SALI maintains overall recall on Condensed Movies and ActivityNet while significantly improving R@1 for multi‑shot relation queries, achieving the largest gains among compared methods and modestly improving performance on MSR‑VTT.

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