Video storytelling is often constrained by available material, limiting creative expression and leaving undesired narrative gaps. Generative video offers a new way to address these limitations by augmenting captured media with tailored visuals. To explore this potential, we interviewed eight video creators to identify opportunities and challenges in integrating generative video into their workflows. Building on these insights and established filmmaking principles, we developed Vidmento, a tool for authoring hybrid video stories that combine captured and generated media through context-aware expansion. Vidmento surfaces opportunities for story development, generates clips that blend stylistically and narratively with surrounding media, and provides controls for refinement. In a study with 12 creators, Vidmento supported narrative development and exploration by systematically expanding initial materials with generative media, enabling expressive video storytelling aligned with creative intent. We highlight how creators bridge story gaps with generative content and where they find this blending capability most valuable.

翻译：视频叙事常常受限于可用素材，制约了创意表达并留下不期望的叙事空白。生成式视频通过定制化视觉内容增强已拍摄素材，为解决这些限制提供了新途径。为探索这一潜力，我们访谈了八位视频创作者，以识别将生成式视频整合到其工作流程中的机遇与挑战。基于这些洞见及既定的电影制作原则，我们开发了Vidmento——一款通过情境感知扩展来创作结合拍摄素材与生成媒体的混合视频故事的工具。Vidmento能发掘故事发展的可能性，生成在风格与叙事上与周边素材相融合的视频片段，并提供精细化控制功能。在一项涉及12位创作者的研究中，Vidmento通过生成式媒体系统性地扩展初始素材，支持了叙事发展与探索，实现了符合创作意图的表现性视频叙事。我们重点阐述了创作者如何用生成内容弥合故事间隙，以及他们在哪些场景中发现这种融合能力最具价值。