引用（剪辑）Reference

剪辑的时候，你实际上在改引用——时间线上每个片段只是一条记录：用哪个文件、入点出点（源文件第几帧）、时间线位置、元数据（速度、变换、不透明度、音频映射、调色）。

• 剪切 = 改这些数字：不是搬像素——只有导出 / 渲染才真正重算画面。
• 解释三件怪事：工程文件小（它只是一张表）；素材挪位置工程全红（路径失效）；交换工程用 XML / AAF / EDL（换的就是这张表）。
• 和调色的对照：剪辑改的是时间与索引，调色改的是数值映射（见 映射（调色））——两者都不动原始素材。

When you edit, what you are actually cutting is references — every clip on the timeline is a record: which file, in / out points (which frames of the source), timeline position, metadata (speed, transform, opacity, audio mapping, grade).

• Cutting = editing these numbers: pixels are never moved — only export / render truly recomputes the picture.
• It explains three oddities: project files are tiny (just a table); move the media and everything goes red (broken paths); exchanges travel as XML / AAF / EDL (the table itself).
• The grading counterpart: editing changes time and index, grading changes number mappings (see Mapping) — neither touches the original media.