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rdLevel 介绍

1. rdLevel 参数控制 x265 编码器在进行模式和深度决策时执行的率失真优化（Rate Distortion Optimization，RDO）级别，rdLevel 决定编码器在 模式选择 和 量化过程 中的优化强度。

    /* A value between 1 and 6 (both inclusive) which determines the level of * rate distortion optimizations to perform during mode and depth decisions.* The more RDO the better the compression efficiency at a major cost of * performance. Default is 3 */int       rdLevel;

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