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，从而制约了创意表达并留下不理想的叙事空白。生成式视频通过用定制化视觉内容增强捕获的媒体，为解决这些限制提供了新途径。为探索这一潜力，我们采访了八位视频创作者，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——一款用于创作混合视频故事的工具，它通过上下文感知扩展将捕获媒体与生成媒体相结合。Vidmento揭示了故事发展的可能性，生成在风格和叙事上与周围媒体融合的片段，并提供精细化控制。在一项涉及12位创作者的研究中，Vidmento通过用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达性视频叙事。我们重点阐述了创作者如何用生成内容弥合故事空白，以及他们在哪些场景中发现这种融合能力最具价值。