VideoMemBench: new benchmark exposes major gaps in MLLMs' in-context video memory

Zhengdong Hu · hf · 2026-11-05

VideoMemBench tests MLLMs on long multi-turn dialogues over a single video, where questions depend on earlier turns via Episodic Dependencies (what the model saw) and Answer Dependencies (what it said). Each dependency is verified for necessity and non-leakage, with an LLM planner/generator/judge pipeline plus human review. The benchmark spans 326 videos and 2,476 turns, 1,387 of which depend on earlier context, revealing substantial performance gaps in a capability prior video QA benchmarks never measured.

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