x265代码阅读：码率控制（二）

最新推荐文章于 2024-09-20 15:46:57 发布

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最新推荐文章于 2024-09-20 15:46:57 发布 · 3.5k 阅读

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本文探讨x265编码器中码率控制的关键参数，包括aqMode和aqStrength如何协同工作，增强低复杂度CTU的比特分配。同时，分析了复杂度模糊、模糊复杂度和CU树等时域RDO概念，这些在HM编码器中未见类似应用。

头文件x265.h中的码率控制参数：

    struct
    {
        /* Explicit mode of rate-control, necessary for API users. It must
         * be one of the X265_RC_METHODS enum values. */
        int       rateControlMode;

        /* Base QP to use for Constant QP rate control. Adaptive QP may alter
         * the QP used for each block. If a QP is specified on the command line
         * CQP rate control is implied. Default: 32 */
        int       qp;

        /* target bitrate for Average BitRate (ABR) rate control. If a non- zero
         * bitrate is specified on the command line, ABR is implied. Default 0 */
        int       bitrate;

        /* qComp sets the quantizer curve compression factor. It weights the frame
         * quantizer based on the complexity of residual (measured by lookahead).
         * Default value