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VDAct 2.0: Scaling Video-Grounded Dialogue for Event-driven Activity Understanding with LLM-Assisted Filtering

We present VDAct 2.0, an enhanced benchmark for video-grounded dialogue that builds upon the original VDAct by expanding dialogue coverage and introducing a scalable LLM-assisted filtering pipeline to ensure high-quality, grounded QA pairs. VDAct 2.0 comprises 6,356 human-annotated dialogues with a total of 63,958 turns, grounded in 2,975 household activity videos, with undesirable dialogue turns systematically identified and removed. To achieve this, we design a trigger-based quality framework and calibrate a panel of high-agreement LLMs through human-in-the-loop calibration, allowing scalable QA-turn-level filtering. We benchmark a wide range of pretrained and fine-tuned models, both open-source and proprietary, across standard text generation metrics and LLM-based evaluations. The results highlight both recent advances and remaining challenges in video-grounded dialogue modeling, positioning VDAct 2.0 as a high-fidelity testbed for evaluating and advancing multimodal reasoning in interactive settings.