Values range from 2 (cuts the framerate by 50%) to 20 (5%) but keep in mind that the higher this value is, the more frames have to be analysed before one is returned.

• 该值可从2（切割帧频率为50%25）-20（切割帧频率为5%25）范围变动，但应记住的是该数值越高，必须分析更多的帧。