MarKey: Marginal Utility Guided Greedy Keyframe Selection for Long Video Understanding

Researchers propose MarKey, a method that picks keyframes for long-video question answering using a greedy strategy driven by marginal utility rather than dense encoding or uniform sampling. The approach targets multimodal large language models, where encoding every frame is costly and even sampling can overlook brief but important moments. The paper is an arXiv preprint and appears under a cross-listing.