编解码器直通Codec Passthrough

难度LEVELL2 · 进阶L2 · Intermediate 领域TOPIC交付

学习目标LEARNING OBJECTIVES

学完你能说清编解码器直通（Codec Passthrough）是什么、满足什么条件才会发生，并靠它显著缩短渲染时间。

概念说明CONCEPTS

编解码器直通（Codec Passthrough）是渲染时的"免检通道"——片段没做任何修改时，渲染器把原始视频数据直接复制进输出文件，跳过解码再重编码的整圈流程。

  • 不动才直通：片段上没有任何特效、转场、调色等修改，才具备直通资格；动过就老老实实重编码。
  • 格式有白名单：只有 Resolve 既能读取又能渲染、且矩阵直通列标 "Yes" 的格式才行——ProRes、DNxHD/DNxHR、GoPro CineForm、Grass Valley HQ/HQX、无压缩都在列。
  • 快是第一收益：跳过重编码，渲染时间大幅缩短，长片感受尤其明显。
  • 画质也沾光：不复压就没有代际损失（generation loss），输出数据与源素材一致。

操作步骤STEPS

  1. 在媒体页面选中源片段，从元数据面板记下它的 Video Codec元数据面板中的 Video Codec 信息
  2. 切到交付页面，Render Settings 选 Custom Export
  3. 把 Format 与 Codec 设为与源素材一致（如 QuickTime + Apple ProRes）Format 与 Codec 跟源素材保持一致
  4. 确认这些片段没有特效或调色，点 Add to Render Queue 再 Start Render

练习PRACTICE

  1. 用与源一致的格式渲染一条未修改的片段，记录耗时。
  2. 给同一片段加一个调色节点再渲染，对比两次耗时，体会"动过就重编码"。

常见问题FAQ

直通需要自己手动开启吗？

不用。格式在白名单、输出设置与源一致、片段未修改，三个条件齐了渲染器自动直通——你只管"别动片段、选对格式"。

H.264 素材想快速导出，能走直通吗？

不能。直通白名单是 ProRes、DNxHR、CineForm、无压缩这类中间格式；H.264/H.265 即使未修改也会完整重编码，想提速可看 GPU 加速编解码。

哪些格式支持直通，在哪查？

查官方编解码器支持矩阵的直通（Passthrough）列，标 "Yes" 即支持，详见 编解码器支持矩阵。

Learning Objectives学习目标

After this card you can explain what Codec Passthrough is and when it kicks in, and use it to cut render times dramatically.

Concepts概念说明

Codec Passthrough is the "express lane" of rendering — when a clip hasn't been modified at all, the renderer copies the original video data straight into the output file, skipping the whole decode-then-re-encode loop.

  • Unmodified only: a clip qualifies only with zero effects, transitions, or grades on it; touch it and it gets re-encoded honestly.
  • A format whitelist: passthrough works only for formats Resolve can both read and render, with a "Yes" in the matrix — ProRes, DNxHD/DNxHR, GoPro CineForm, Grass Valley HQ/HQX, and uncompressed are on it.
  • Speed is the headline: skipping re-encoding slashes render times, especially on long timelines.
  • Quality gains too: no re-compression means no generation loss — the output data matches the source.

Steps操作步骤

  1. On the media page, select a source clip and note its Video Codec in the Metadata panelThe Video Codec info in the Metadata panel
  2. Switch to the deliver page and choose Custom Export in Render Settings
  3. Set Format and Codec to match the source (e.g. QuickTime + Apple ProRes)Format and Codec matching the source media
  4. Confirm the clips carry no effects or grades, then click Add to Render Queue and Start Render

Practice练习

  1. Render an unmodified clip with a source-matching format and note how long it takes.
  2. Add one grade node to the same clip, render again, and compare — feel what "modified means re-encoded" costs.

FAQ常见问题

Do I need to turn passthrough on manually?

No. Whitelisted format, matching output settings, and an unmodified clip — when all three hold, the renderer passes through automatically. Your job is just "don't touch the clip, pick the right format."

Can H.264 media use passthrough for a fast export?

No. The whitelist covers intermediate formats like ProRes, DNxHR, CineForm, and uncompressed; H.264/H.265 get fully re-encoded even when untouched — see GPU Accelerated Codec for speed there.

Where do I check which formats support passthrough?

In the official codec support matrix's Passthrough column — "Yes" means supported. See Codec Support Matrix.

深度资料：编解码器直通 →Deep dive: 编解码器直通 →

本卡术语Terms in this card

时间线Timeline 编码器Codec 交付页Deliver page 导出Export H.264H.264 ProResProRes 渲染队列Render Queue 渲染Render 变速Speed 转场Transition 快速导出Quick Export Gain（亮部）Gain 调色Grade 元数据Metadata 节点Node