查看指令 ffmpeg -h encoder=libx264 ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developersīuilt with Apple LLVM version 10.0.0 (clang-1000.11.45.5)Ĭonfiguration: -prefix=/usr/local/Cellar/ffmpeg/4.1_1 -enable-shared -enable-pthreads -enable-version3 -enable-hardcoded-tables -enable-avresample -cc=clang -host-cflags= -host-ldflags= -enable-ffplay -enable-gpl -enable-libmp3lame -enable-libopus -enable-libsnappy -enable-libtheora -enable-libvorbis -enable-libvpx -enable-libx264 -enable-libx265 -enable-libxvid -enable-lzma -enable-opencl -enable-videotoolboxĮncoder libx264 :

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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