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结论：
fps_max 仅在低于你机器原本能够录制的fps时影响速度
fps_max
设置fps_max 0可以提高录制纯音频的速度 1.333x
fps_max 0
1.333x
x264参数Preset的值为fast 是最香的点
Preset
fast
提高max_gop有助于降低码率
max_gop
CRF最香的点有： 12, 15, 17, 19, 21.5
注：每个测试点一个样本可能不可信；其他的CRF值不知道能否得到同样的结论；不同的电脑配置情况可能也会不同
