118 lines
4.3 KiB
Markdown
118 lines
4.3 KiB
Markdown
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# 透明图集路线
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仅当 Concept Contract 锁定 `background_owner: page`（主体确有透明复用需求），且
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`motion_budget.py` 返回 `delivery.selected=alpha-atlas` 时执行本流程。结果不是
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`alpha-atlas` 时停止阅读，改走 [chroma-video.md](chroma-video.md) 或
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[baked-video.md](baked-video.md)。
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本文档只覆盖图集路线专属的帧提取、清理、检测与打包。公共步骤各有唯一事实源：
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- 预算与路线选择：[delivery-selection.md](delivery-selection.md)
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- 关键帧、提示词与提交命令：[prompting.md](prompting.md)
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- 帧策略与图集压缩：[optimization.md](optimization.md)
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- 母版验收、抠图验收、Pilot 与帧链硬门：[qa.md](qa.md)
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- 运行时映射：[runtime.md](runtime.md)
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## 交付物
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```text
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motion-name/
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├── source/
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│ ├── first-frame.png
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│ ├── last-frame.png # 单向转场需要
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│ ├── prompt.txt
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│ ├── master.mp4
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│ └── master.job.json
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├── frames/
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│ ├── raw/
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│ ├── clean/ # 闭环或尾部清理后
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│ └── final/
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├── qa/
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│ ├── raw-analysis.json
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│ ├── raw-contact.jpg
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│ ├── final-analysis.json
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│ └── final-contact.jpg
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└── final/
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├── motion.webp
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├── motion.json
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└── implementation.*
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```
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## 1. 帧准备与离线抠色
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母版通过 [qa.md](qa.md) 的母版验收后再提取帧。色键在这一步离线去除，网页只加载已经透明的图集。
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`frame_policy=native` 时按源帧提取，`--key auto` 从画面边缘采样实际背景色：
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```bash
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python3 "$OIL_MOTION/scripts/motion_pipeline.py" extract \
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source/master.mp4 frames/raw \
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--key auto
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python3 "$OIL_MOTION/scripts/motion_pipeline.py" analyze frames/raw \
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--output qa/raw-analysis.json
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python3 "$OIL_MOTION/scripts/motion_pipeline.py" contact frames/raw \
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--output qa/raw-contact.jpg \
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--columns 8
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```
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`frame_policy=interpolate` 时改用 [optimization.md](optimization.md) 的插帧命令，它同时输出原始与插帧的接触表和对比报告。
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在白、黑和真实页面背景上查看接触表：残留色键、主体内部被误删或边缘溢色时，回到母版或关键帧返工，不靠调阈值掩盖。
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## 2. 闭环清理与可选稳定
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闭环动画：
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```bash
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python3 "$OIL_MOTION/scripts/loop_cleanup.py" \
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frames/raw frames/clean \
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--seam-window "$SEAM_WINDOW" \
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--duplicate-threshold "$DUPLICATE_THRESHOLD" \
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--report qa/loop-cleanup.json
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```
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该工具只做确定性选帧，不生成动作，也不对相邻帧做透明叠加。接缝选错时调整
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`--seam-window`，不要为了减少帧数盲目提高重复阈值。首尾不同的单向转场传入
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`--end-reference last-frame.png`，裁掉模型在尾帧上的多余停顿。
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固定主体存在轻微漂移时才稳定：
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```bash
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python3 "$OIL_MOTION/scripts/motion_pipeline.py" normalize \
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frames/clean frames/final \
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--anchor bottom \
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--max-scale-change 0.08
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```
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不需要清理或稳定的步骤直接跳过，把上一步合格的帧作为 `frames/final`。自由运动、镜头运动和真实透视变化禁止稳定。
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## 3. 最终门槛与图集打包
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```bash
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python3 "$OIL_MOTION/scripts/motion_pipeline.py" analyze frames/final \
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--output qa/final-analysis.json
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python3 "$OIL_MOTION/scripts/motion_pipeline.py" contact frames/final \
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--output qa/final-contact.jpg \
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--columns 8
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python3 "$OIL_MOTION/scripts/motion_pipeline.py" atlas frames/final \
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--output final/motion.webp \
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--manifest final/motion.json \
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--cell-width 360 \
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--cell-height 360 \
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--quality 88
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```
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打包前用最终帧数和单元格尺寸重新运行 [delivery-selection.md](delivery-selection.md)
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的预算。只有仍返回 `alpha-atlas` 且通过时才打包；结果变成 `chroma-video` 时停止打包，
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改走视频路线。需要压到目标体积时按 [optimization.md](optimization.md) 执行，不要手动
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反复猜 WebP 质量。
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## 4. 网页实现
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从 [assets/interactive-motion.ts](../assets/interactive-motion.ts) 的对应控制器开始，
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映射、阻尼、预加载和降级按 [runtime.md](runtime.md) 执行，验收和故障定位按
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[qa.md](qa.md) 执行。出现闪帧时按“母版 → 帧 → 图集 → 映射 → 解码”的顺序定位。
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