MediaIn 节点MediaIn Node

难度LEVELL2 · 进阶L2 · Intermediate 领域TOPIC视觉特效

先学：Prerequisites: 节点编辑器

学习目标LEARNING OBJECTIVES

学完你能说清 MediaIn 节点的作用，把时间线片段引进合成，并从媒体池补进第二路素材。

概念说明CONCEPTS

MediaIn 节点把时间线上的片段引进 Fusion 合成——它是节点树的起点，源素材从这里流入管道。

  • 自动生成：播放头压着片段跳进 Fusion 页面时，该片段自动变成 MediaIn1 节点，分辨率跟随片段本身。
  • 可以有多路：从媒体池把别的片段直接拖进节点编辑器，就会新增一个 MediaIn——一个合成想要几路素材都行。
  • 先改名再干活：选中按 F2 改成有意义的名字（如 Plate），节点树长大了才知道谁是谁。
  • 行话 Plate：合成里被加工的底图素材叫 Plate（底片），这个说法从胶片时代沿用至今。

操作步骤STEPS

  1. 在编辑页面把播放头压到要做特效的片段上，按 Shift-5 跳进 Fusion——MediaIn1 已在节点编辑器就位跳进 Fusion 后自动生成的 MediaIn1 节点
  2. 选中 MediaIn1 按 F2，改名为 Plate
  3. 点左上角 Media Pool 打开媒体池，把另一段素材直接拖进节点编辑器，生成第二个 MediaIn 节点从媒体池拖素材生成新的 MediaIn 节点
  4. 右键节点区空白处选 Force Source Tile Pictures，让素材节点显示缩略图

练习PRACTICE

  1. 给时间线上的片段建一个合成，把 MediaIn1 改名为 Plate。
  2. 从媒体池再拖一段素材进节点编辑器，确认出现第二个 MediaIn 节点并给它改名。

常见问题FAQ

一个合成能有几路 MediaIn？

不限。时间线片段自动生成一路，其余随时从媒体池拖进来——每拖一段，多一个 MediaIn 节点。

缩略图开了还是不显示怎么办？

第一次生成时常见。把节点按 1 或 2 装进查看器、动一下播放头让画面载入，缩略图就出来了。

MediaIn 的分辨率和时间线不一致要紧吗？

先不用管。MediaIn 按片段自身分辨率创建；最终输出分辨率由 Merge 节点的背景输入决定（见 Merge 节点）。

Learning Objectives学习目标

After this card you can explain what a MediaIn node does, bring a timeline clip into a composition, and pull in a second source from the Media Pool.

Concepts概念说明

A MediaIn node brings a clip from the timeline into your Fusion composition — it's the starting point of the node tree, where source footage enters the flow.

  • Created automatically: jump to the Fusion page with the playhead on a clip and it becomes a MediaIn1 node, at the clip's own resolution.
  • More than one is fine: drag another clip from the Media Pool straight into the Node Editor and a new MediaIn appears — as many sources as your comp needs.
  • Rename before you work: select and press F2 for a meaningful name (like Plate), so a grown-up node tree stays readable.
  • Jargon: Plate: the base footage being worked on is called the plate — a term carried over from the film era.

Steps操作步骤

  1. On the edit page, park the playhead over the clip you want to work on and press Shift-5 — MediaIn1 already waits in the Node EditorMediaIn1 created automatically after jumping to Fusion
  2. Select MediaIn1, press F2, and rename it Plate
  3. Open the Media Pool at the top left and drag another clip straight into the Node Editor — a second MediaIn node appearsDragging a clip from the Media Pool to create a MediaIn node
  4. Right-click empty space and choose Force Source Tile Pictures so source nodes show thumbnails

Practice练习

  1. Build a composition from a timeline clip and rename its MediaIn1 to Plate.
  2. Drag one more clip in from the Media Pool, confirm the second MediaIn node appears, and rename it too.

FAQ常见问题

How many MediaIn nodes can one composition have?

No limit. The timeline clip creates one automatically; drag in more from the Media Pool anytime — one new MediaIn per clip.

Thumbnails still blank after I turned them on?

Common the first time. Load the node into a viewer with 1 or 2 and nudge the playhead — once the picture loads, the thumbnail shows up.

MediaIn resolution doesn't match the timeline — a problem?

Don't worry about it yet. MediaIn keeps the clip's native resolution; the output resolution is decided by the Merge node's background input (see Merge Node).

本卡术语Terms in this card

媒体池Media Pool 时间线Timeline 分辨率Resolution 编辑页Edit page 播放头Playhead 静帧Still 合成Compositing Fusion 合成Fusion 合并Merge 节点Node