Take a look at README-tips.rtf.
Quote:
Quality Slider
* Quality slider corresponds to ffmpeg -qmin. Center is QP=23, Best is QP=13, Least is QP=33. And qmax is QP=51, fixed value.
* On Constant Rate Factor-CRF Mode, the slider corresponds to ffmpeg -crf. Center is crf=23, Best is crf =13, Least is crf =33.
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When you don't move slider as default, QP23 or CRF23 are applied.