generate-thumbnaillisted

# Generate Thumbnail / 缩略图 ## When to use / 何时使用 封面制作。一次产出多平台尺寸。 Thumbnail production; outputs multi-platform sizes. ## Inputs / 输入 - `workspace/final/master.mp4`. - `--headline` short text (≤ 18 chars EN / ≤ 10 zh). - `templates/thumbnail/<style>.html`. ## Output / 输出 - `workspace/youtube/thumbnail.png` (1280×720). - `workspace/bilibili/cover.jpg` (1146×717). ## Steps / 步骤 1. Sample 30 candidate frames; pick highest face score + sharpness. 2. Inject headline + brand into template; render via Hyperframes. 3. Resize for each target platform. ## Examples / 示例 ``` claude run generate-thumbnail --headline "RAG 是什么" ``` ## Failure recovery / 失败回退 - If no face frames, use the section's first frame. - If headline too long, ellipsize and warn.