允许您删除内置蒙版跟踪器生成的“不必要的”关键帧。它将查看蒙版的跟踪器生成的每帧关键帧，并删除落入与其前任相似的阈值以下的那些帧。
执行两遍：移除和加固。
删除过程包括删除与上一个关键帧过于相似的关键帧。当两个顶点的移动均未超过指定的（移除）阈值时，两个关键帧被视为相似。
强化过程会分析其余关键帧的每个连续对。当顶点移动超过（增强）阈值时，将在两个关键帧的中间重新引入先前删除的关键帧。重复该阶段，直到每对都满足条件为止。关键帧减少的百分比将写入信息面板。
Allows you to remove ‘unnecessary’ keyframes generated by the built-in mask tracker. It will look at the mask’s tracker-generated every-frame keyframes and remove those frames that fall under a threshold of being similar to their predecessor.
Two passes are executed: removal and reinforcement.
The removal pass consists of removing keyframes that are too similar to the previous one. Two keyframes are considered similar when none of the vertices has moved more than the specified (removal) threshold.
The reinforcement pass analyzes every successive pair of the remaining keyframes. When a vertex has moved more than the (reinforcement) threshold, a previously removed keyframe is reintroduced in the middle of the two keyframes. This phase is repeated until every pair satisfies the condition. The percentage of keyframe reduction is written to the Info palette.
Win/Mac：After Effects 2020, CC 2019, CC 2018, CC 2017, CC 2015.3, CC 2015, CC 2014, CC, CS6
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