Drawing frames of video at various positions in time that are potentially overlapping requires special consideration in the pre-rendering steps.

视频的多个时间帧有潜在的重叠，因此在呈现前的步骤中需要特别注意。

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The method comprises the following steps:- defining a virtual structure made up of non overlapping macroblocks, called virtual base layer macroblocks;

所述方法包括以下步骤：定义由非交叠宏块组成的虚拟结构，称为虚拟基础层宏块；

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The method comprises the following steps:- defining a virtual structure made up of non overlapping macroblocks, called virtual base layer macroblocks;

所述方法包括以下步骤：定义由非交叠宏块组成的虚拟结构，称为虚拟基础层宏块；

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