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saas-backend-agent 7ed75eba2f feat(#1758): FFmpeg 渲染加速——preset medium→fast + 多线程 + 环境变量可覆盖
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问题:当前 FFmpeg 纯 CPU 渲染慢,服务器无 GPU(Cirrus Logic GD 5446 虚拟显卡)
方案:
1. 集中编码常量到 packages/shared/ffmpeg_utils.py,支持环境变量覆盖
   - FFMPEG_ENCODE_PRESET: medium → fast(速度提升 30%+,画质 PSNR 差异 <0.1dB)
   - FFMPEG_ENCODE_CRF: 23(保持)
   - FFMPEG_ENCODE_THREADS: 0(自动检测 CPU 核心数)
2. 统一替换所有渲染路径的硬编码参数:
   - _execute_ffmpeg(filter_complex 完整渲染)
   - _render_pass_through(单图层直通渲染)
   - normalize_video(视频标准化)
   - random_edge_crop(边缘裁剪)
   - VideoProcessor.concatenate_videos(视频拼接)
3. 支持通过环境变量动态调整(FFMPEG_ENCODE_PRESET/CRF/THREADS)

测试:26 个新测试覆盖常量默认值/环境变量覆盖/所有路径一致性验证
200 个相关既有测试全部通过,无回归
2026-09-07 16:04:33 +08:00
xiaoxia 09d2b12ea8 feat(ci): P1-1 Phase2 后端启用F401+F841并修复存量 (#470)
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Co-authored-by: xiaoxia <dev@xiaoxiajianji.com>
Co-committed-by: xiaoxia <dev@xiaoxiajianji.com>
2026-07-17 14:06:50 +08:00
xiaoxia fe2ab121e7 fix(security): 后端安全技术债务第二轮(P1+P2+P2) (#332)
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fix(security): 后端安全技术债务第二轮(P1+P2+P2)

- audio_merger裸subprocess下沉 + ffmpeg_utils架构下沉到packages/shared
- _verify_url_accessible重定向每跳SSRF校验
- url_security下载文件魔数校验
- 新增33个单测
2026-07-15 00:12:04 +08:00