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Stream the CLI/MCP audio export instead of buffering whole files

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维护者通常 1 天内回复

@auberginewly 已经在做这个了。

开始于 2026年10月28日。

评估

难度
5/5
预计耗时
一周以上
新手友好度
35/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
electron, typescript

调研方向

Start with src/cli/CliExportRunner.tsx and follow exportAudio and the MP4 voiceover mix through writeExportToPath and the existing render path. Then trace the render source and IPC write APIs to determine how chunked reads and streamed writes fit together. Done means audio exports avoid holding the full rendered video and audio buffers in the renderer; the issue proposes streamed IPC or main-process WAV writing as possible approaches.

由索引模型根据 Issue 内容生成。

描述

Follow-up from #1383 (review comment on src/cli/CliExportRunner.tsx).

The CLI/MCP audio export (exportAudio, openscreen export -o out.wav|out.m4a) and the MP4 voiceover mix both hold whole files in memory in the renderer: the rendered MP4 is fetched back as a Blob, the audio is extracted into an ArrayBuffer, and the result goes through writeExportToPath as one buffer over IPC. For a long project that means the full MP4 plus the full WAV live in the renderer at once, which can exhaust memory.

Proposal: stream instead of buffering. Read the render from disk in chunks (mediabunny StreamSource or a file-handle source), write the extracted audio through a streamed target, and add a write-stream IPC (open / append / close) rather than a single-buffer write. A WAV could also be written by the main process directly.

Out of scope for #1383, which keeps the existing buffer-based path the MP4 export already uses.

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环境准备

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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