Towards an Automatic Parameter-Tuning Framework for Cost Optimization on Video Encoding Cloud

Table 1

PSNR versus CRF (foreman).

Foreman	crf = 20		crf = 23		crf = 26
	PSNR mean	Deviation (%)	PSNR mean	Deviation (%)	PSRN mean	Deviation (%)
B-frame	40.38	0.51	38.60	0.09	36.88	0.33
Ref	40.45	0.79	38.73	1.08	37.03	1.21
Subme	40.05	2.6	38.25	3.01	36.49	3.26
Trellis	40.22	0.73	38.46	0.71	36.74	0.77