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VideoFrame.copyTo is manipulating JS objects in a background queue

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@Djuffin 已经在做这个了。

开始于 2026年10月6日。

  • #958 来自 @Djuffin —— 未关闭

评估

难度
5/5
预计耗时
一周以上
新手友好度
30/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
活跃
技术栈
javascript
领域
api

调研方向

Start with the WebCodecs specification's VideoFrame.copyTo algorithm and trace where the JS-visible destination is written and where RGB conversion occurs. Compare the four proposed API or specification directions, then define a chosen approach whose completion criteria cover safe destination mutation and the desired handling of RGB conversion.

由索引模型根据 Issue 内容生成。

描述

CR Blocking PR exists TPAC2026

As per https://w3c.github.io/webcodecs/#dom-videoframe-copyto, destination which is a JS visible object is written from a background queue task, which is an anti-pattern.
This creates problems (JS observability, destination mutating during the copyTo tasks).

There are various ways to fix this, for instance:

  1. make copyTo algorithm synchronous
  2. Expose a new asynchronous API that would transfer the destination buffer and provide the returned value as part of the promise value.
  3. Extend copyTo API surface to implement 2 within it.
  4. Change the spec to write destination asynchronously but in an event loop task with additional checks, even if UA may do it in a smarter way.

As a side note, copyTo algorithm is also synchronously converting to RGB.
It would be convenient to do this asynchronously, which is feasible by cloning the VideoFrame synchronously and using the cloned VideoFrame in the remainder of the algorithm.

主要语言
HTML
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21 小时 7 分钟
30 天内合并 PR
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环境准备

  • 没有 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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