saas-backend-agent
c2a510331e
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根因：render_audio.mix_audio 中 main_clips = [] 无条件丢弃主图层源视频 原声（PR #1249 "避免录入杂音"），导致走新路径 render_plan 生成的成片 没有原声，与预览不一致（用户反馈"音频没有"）。 修复： - mix_audio 保留 main/broll 原声，按 clip.config.volume 控制音量， 无音频流/静音(volume=0)的 clip 安全过滤 - concat_main_audio 单clip与多clip路径均应用 per-clip volume 滤镜 - 直通渲染(_render_pass_through)改为先 probe_has_audio 再决定是否编码 音频，并应用 per-clip volume；不再无条件假设 main 带音频 - stream copy 在音量非默认时回退重编码 - 新增 _clip_volume 辅助函数(render_audio + UnifiedRenderService) - 更新 test_unified_render_service 旧"丢弃原声"断言为新行为 - 新增 test_original_audio_retained.py 9 个回归测试 验证：161 个相关单测全部通过