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我是学习服务器端广告插入概念的新手。它利用 ID3 定时元数据来唯一标识每个用户的视频会话。它如何唯一标识用户的视频会话？是因为 ID3 定时元数据在本质上是独一无二的吗？如果是，那么是什么参数使它独一无二？