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feat: #1970 片段级 AI 标签 + 叙事加权匹配 - atom_clip_tagger.py: MediaKit 抽帧 + 豆包视觉 API 识别 - narrative_match.py: AI 标签加权匹配 (2.0 vs 1.0) - Celery 链式触发 + 批量回填脚本 - migration 081 加 ai_tags 列 - 42 新测试,全量 15796 passed
83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
"""素材原子片段(Atom Clip)领域实体 — #1970 智能剪辑流程重构。
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原子片段是素材的逻辑切分单元,不物理切割视频文件。
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每条记录指向某条素材的一段 [start_time, end_time] 区间。
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"""
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from __future__ import annotations
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import uuid
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from dataclasses import dataclass, field
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from datetime import UTC, datetime
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@dataclass
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class AssetAtomClip:
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"""素材原子片段。
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Attributes:
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id: 唯一标识。
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asset_id: 所属素材 ID。
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start_time: 片段起始时间(秒,浮点)。
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end_time: 片段结束时间(秒,浮点)。
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duration: 片段时长 = end_time - start_time(秒)。
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clip_index: 在同一素材内的顺序编号(从 0 开始)。
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tags: 继承自素材的标签,JSONB 存储,可为空列表。
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scene_change_at: 片段尾部是否对齐了 scdet 镜头切换点(存储该切点的精确时间),
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未对齐时为 None。
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is_fallback: 是否为兜底逻辑在内存中生成的临时片段(不入库)。
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created_at: 创建时间。
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"""
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id: str
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asset_id: str
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start_time: float
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end_time: float
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duration: float
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clip_index: int
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tags: list[str] = field(default_factory=list)
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ai_tags: dict | None = None
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scene_change_at: float | None = None
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is_fallback: bool = False
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created_at: datetime | None = None
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def __post_init__(self):
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if not self.id:
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self.id = str(uuid.uuid4())
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if self.duration <= 0:
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self.duration = round(self.end_time - self.start_time, 3)
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if self.duration < 0:
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raise ValueError(f"duration must be >= 0, got start={self.start_time}, end={self.end_time}")
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if self.start_time < 0:
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raise ValueError(f"start_time must be >= 0, got {self.start_time}")
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if self.end_time <= self.start_time:
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raise ValueError(f"end_time must be > start_time, got start={self.start_time}, end={self.end_time}")
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if self.clip_index < 0:
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raise ValueError(f"clip_index must be >= 0, got {self.clip_index}")
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if self.created_at is None:
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self.created_at = datetime.now(UTC)
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@classmethod
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def create(
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cls,
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asset_id: str,
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start_time: float,
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end_time: float,
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clip_index: int,
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tags: list[str] | None = None,
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scene_change_at: float | None = None,
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is_fallback: bool = False,
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) -> AssetAtomClip:
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"""工厂方法:创建一个新的原子片段。"""
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return cls(
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id="", # __post_init__ 会自动生成
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asset_id=asset_id,
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start_time=round(start_time, 3),
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end_time=round(end_time, 3),
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duration=round(end_time - start_time, 3),
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clip_index=clip_index,
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tags=tags or [],
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scene_change_at=scene_change_at,
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is_fallback=is_fallback,
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)
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