cq Set target quality level (0 to 51, 0 means automatic) for constant quality mode in VBR rate control (from 0 to 51) (default 0) -qpĬonstant quantization parameter rate control method (from -1 to INT_MAX) (default -1)Ĭonstant quantization parameter rate control method (from -1 to 51) (default -1) libx264 专有参数 -tune
crf d Select the quality for constant quality mode (from -1 to FLT_MAX) (default -1) 与crf、cq、qp、vbr、cbr相关的解析可以参考： Understanding Rate Control Modes (x264, x265, vpx) 和 CRF Guide (Constant Rate Factor in x264 and x265) preset faster 是做了如下设置 -no-mixed-refs -rc-lookahead 20 -ref 2 -subme 4 -weightp 1
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