xiaoxia
8e89717166
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问题根因： 1. OSS bucket 为私有，upload_to_oss 返回的公开 URL 返回 403 2. API 降级逻辑把视频 .mp4 的 signed URL 当作 thumbnail_url 返回 3. 浏览器 <img> 无法渲染 .mp4 文件，显示黑屏 修复： - ingest.py: 存储 storage_key 而非公开 URL，API 层统一签名 - assets.py: 移除 .mp4 降级，thumbnail_url 通过 get_download_url 签名 - AssetCard.tsx: 检测视频 URL 后缀 + onError 降级显示类型图标 - 新增 batch_generate_thumbnails Celery 任务，为 2587 个历史视频补生成缩略图 - 同时处理 242 条旧格式公开 URL → storage_key 迁移