[Feature]: Add HEVC (H.265) export support

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Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
electron, typescript
领域
backend, desktop

调研方向

Start by locating the export dialog and the existing H.264 codec selection, then trace how export settings reach the encoder. The issue suggests adding HEVC as an option, preferring hardware encoding with software fallback, and keeping H.264 as the default. Done means HEVC exports work across supported platforms and the existing default remains H.264; the issue names no files or tests.

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描述

enhancement
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Is your feature request related to a problem?

Hi OpenScreen team,

Could you please add HEVC (H.265) as an export codec option alongside the current H.264?

Describe the solution you'd like

Why this would be useful

  • Significantly smaller file sizes at the same (or better) visual quality compared to H.264
  • Especially helpful for longer recordings, 4K/high-fps exports, and sharing
  • Modern hardware encoders (NVENC, AMF, Quick Sync, VideoToolbox) already support HEVC efficiently

Suggested implementation

  • Add “HEVC / H.265” as a selectable codec in the export dialog (next to H.264)
  • Prefer hardware encoding when available, with software fallback
  • Keep H.264 as the default for maximum compatibility

This would be a great addition for users who want better compression without sacrificing quality.

Thank you for the excellent work on OpenScreen!

Describe alternatives you've considered

No response

Additional context

No response

主要语言
TypeScript
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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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