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if((distance from previous keyframe) > keyint){
	set IDR-frame
} else if ( [1 - (bit size of P-frame) / (bit size of I-frame) ] < [(scenecut / 100) * (distance from previous keyframe) / keyint]){
	if ((distance from previous keyframe) >= minkeyint){
		set IDR-frame
	} else {
		set I-frame
	}
} else {
	set P-frame
}
encode frame for real.