perf(worker): 封面抽帧三优化 — blackdetect黑屏规避+单次ffmpeg批量抽帧+并发上传+CJK字体兜底 #2091
Merged
auto-approve-bot
merged 4 commits from 2026-09-28 22:32:56 +08:00
fix/cover-blackdetect-batch-upload-fonts into develop
4 Commits
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 CI Bot
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b6c7308c40 |
style: auto-format with black + isort + ruff + prettier [skip ci-format-check]
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saas-backend-agent
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74a3bd51ab |
test(worker): 更新 thumbnail 单测适配新抽帧流程 + 新增 blackdetect 偏移逻辑纯逻辑测试
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saas-backend-agent
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f5cb0b13cf |
fix(ci): Dockerfile 字体安装步骤容错 — 不阻断镜像构建，fc-match 结果打日志
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3faa11fef0 |
perf(worker): 封面抽帧三优化 — blackdetect黑屏规避+单次ffmpeg批量抽帧+并发上传+CJK字体兜底
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1. 黑屏检测（blackdetect）：抽帧前先用 ffmpeg blackdetect(d=0.3,pic_th=0.98,pix_th=0.10) 扫描成片黑屏区间，
seek 点落在黑屏内时偏移到最近非黑屏位置；整段全黑则保留中点并打 warning 日志。避免封面/首帧落到黑屏。
2. 封面批量抽帧+并发上传：5次串行 ffmpeg -ss seek 改成单次 ffmpeg select between(t,...) 一次输出 5 帧；
5帧上传 OSS 用 ThreadPoolExecutor 并发（max_workers=min(8,N)）。目标封面阶段从 ~3.1s 压到 <1.5s。
单次 select 失败/命中不足自动回退到单帧 -ss seek 兜底，保证鲁棒性。
3. Worker Dockerfile 加 fonts-noto-cjk 安装与 fc-cache：
- 在 worker.Dockerfile apt-get install 显式加 fonts-noto-cjk + fontconfig（base 镜像漂移兜底）
- build 时 fc-cache -fv + fc-match 'Noto Sans CJK SC' 校验，确保 fc-match 能解析到 Noto，
不再依赖 PIL 直读 ttf 兜底路径。
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