用 Helix DNA Prdcucer 10 来压，
ehq=65 时， Video Codec 是RealVidel 9
ehq=70或80时， Video Codec 是RealVidel 10
65 = Default : improved efficiency for high action
70 = High : same as 65 + better mode decisions, better representation of high motion
80 = Extra High: same as 70 + best possible mode decisions, very high accuracy motion representation
(65) same encoding time as before
(70) will take about 2X - 2.5X encoding time compared to default
(80) about 3X - 4X default
