xiaoxia/xiaoxia-saas
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xiaoxia-bot f83e7db13c fix: black + isort 格式化
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2026-07-14 10:29:29 +08:00
CI Bot 11a4d83cdb feat: 视频封面生成 + 视频倒放 + 贴纸叠加三个渲染能力 
- cover_generator.py: 三种封面生成模式（指定时间抽帧/智能封面/自定义上传）
  - 指定时间点抽帧，默认第1秒，支持时间钳制
  - 智能封面：均匀抽3帧，选最清晰的一帧
  - 自定义封面：自动调整尺寸到标准格式
  - 失败降级：不阻断主流程

- reverse_engine.py: 视频/音频倒放引擎
  - 基于 FFmpeg reverse + areverse 滤镜
  - 每个 clip 独立配置，支持只倒视频或只倒音频
  - 安全限制：超过120s自动跳过，防止内存溢出
  - 配置从 clip.config.reverse 读取，零侵入数据模型

- sticker_engine.py: 贴纸叠加引擎
  - 图片贴纸：位置/大小/透明度/时间范围/淡入淡出
  - 文字贴纸（花字）：字体/颜色/描边/阴影/动画
  - 9宫格预设 + 自由坐标（像素/百分比）
  - 多贴纸按 z_index 排序叠加
  - 5个预设贴纸分类
  - 降级：素材不存在自动跳过，不阻断渲染

- UnifiedRenderService 全链路接入
  - 倒放：Step 1 预处理（trim之后scale之前），filter_complex + 直通双路径
  - 贴纸：最终合成后字幕之前叠加，图片贴纸需额外输入
  - 有贴纸时禁用直通模式（需要filter_complex）
  - 音频倒放：render_audio 单clip + 多clip双路径接入

- 59个新增单测，覆盖核心场景 + 降级逻辑 + 集成测试
 2026-07-14 10:29:29 +08:00