这是一款基于 LTX 2.3 Dev-Dare / Distilled 视频模型 + IC-LoRA 视频引导 + Gemma API 提示词编码 + 视频外扩拼接 + 色彩校正 + 分块解码输出 的电影级视频外扩应用。用户上传一段原始视频后，系统会读取视频帧、帧率和音频信息，再根据提示词对画面外侧区域进行生成补全，最后把原视频与新生成的扩展区域拼接成更大画幅的视频。
这条流的核心优势是：原视频主体和动作保留，画面外侧空间由 LTX 2.3 生成补全。 它不是普通图片扩图，而是针对视频连续帧做外扩，适合把竖屏变横屏、把窄画幅扩成电影宽银幕、给视频补出左右环境、上下空间、背景建筑、天空、地面、舞台、场景氛围等内容。工作流里还保留了色彩校正、视频信息读取、音频传递和最终 mp4 合成结构，因此更适合做成正式 RunningHub 视频应用。使用时建议重点控制三项：输入视频决定主体和运动，全局提示词（用来写整体画面规则）决定外扩画面风格，分段提示词（写每个时间段的动作变化）决定视频中不同阶段的补全变化。
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