AutoCue: Multimodal LLM-Assisted Externalization of Implicit Inputs as Instructional Visual Cues in Screencast Tutorials

Tutorial videos are widely used for learning feature-rich software, yet following screencast tutorials often breaks down in practice. Through a survey and contextual inquiry, we found that learners frequently rewind or get stuck because critical input information, especially mouse actions and keyboard-modified operations, is often implicit or missing in tutorials without input metadata. To address this problem, we present AutoCue, a multimodal LLM-assisted, human-in-the-loop tutorial augmentation pipeline for externalizing implicit inputs as instructional visual cues. AutoCue integrates frame-to-frame visual changes, narration signals, and operation guidance from official software manuals to infer likely mouse and key-modifier actions, then produces aligned cue layers and editable artifacts for human refinement. Grounded in multimedia learning and cognitive load theory, we further develop a visual cue grammar for representing mouse, keyboard, and combined inputs in software-learning tutorials. We instantiate and evaluate AutoCue in Autodesk Maya, focusing automatic inference on selected UI-mediated interactions with observable visual or textual feedback while supporting more ambiguous state changes through editable authoring artifacts. In a between-subjects study with 24 participants, the AutoCue-augmented tutorial reduced task completion time and interaction breakdowns and showed improved learner-reported experience.