这是一款基于 LTX 2.3 Dev-Dare / Distilled 视频模型 + ImagePad 外扩画布 + KJ 尺寸适配 + IC-LoRA 视频引导 + Gemma API 提示词编码 + 色彩校正 + 视频拼接输出 的电影级视频外扩应用。用户上传一段原视频后，系统会先用 ImagePad 扩展画布，再通过 KJ Resize 统一尺寸，然后交给 LTX 2.3 生成外侧补全区域，最后把原视频与扩展画面拼接成更大画幅的视频。
这版相比上一版的优势是：外扩画布更直接，尺寸链路更清楚，适合做左右扩图、上下扩图和宽银幕重构。 它不是普通图片扩图，而是针对视频连续帧做外扩：原视频主体、动作和镜头节奏保留，画面外侧空间由 LTX 2.3 生成补全。适合把竖屏视频扩成横屏，把窄画幅扩成电影宽银幕，也适合补出背景建筑、天空、地面、舞台、山海场景、城市街景和广告空间。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）决定外扩空间风格，分段提示词（写每个时间段的动作变化）决定不同时间段的补景变化。
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