saas-backend
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问题根因： 1. MediaKit 抽帧轮询参数过短（poll_interval=2s, max_poll_attempts=5，最多等 10s），大视频或排队场景下 MediaKit 尚未完成即放弃 2. 帧图片串行下载，每次新建 TCP 连接（httpx.get），5帧×15s 最坏 75s，加上 persist 再下载 30s，总耗时可达 105s 3. 前端传入的 video_url 可能是 OSS 私有桶裸 URL，MediaKit 无法访问导致抽帧失败 修复： - MediaKit 抽帧参数：poll_interval 2s→3s，max_poll_attempts 5→20（最多等 60s），max_retries 0→1 - 帧下载改用 httpx.Client 连接池复用，减少连接建立开销 - 新增 _sign_video_url_for_mediakit：自动检测自家 OSS URL 并重签 7 天有效期 - 路由层增加 try/except 包裹 generate_smart_cover，异常时返回 fallback 而非 502 - 增加关键路径日志 测试：新增 3 个单测（video_url 重签、外部 URL 透传、轮询参数校验），共 15 测试全过