feat(#1758): FFmpeg 渲染加速——preset medium→fast + 多线程 + 环境变量可覆盖 #1757
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merged 2 commits from 2026-09-07 16:37:35 +08:00
feat/ffmpeg-hardware-acceleration into develop
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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 |