vcodec=libvpx
 g=120
 rc_lookahead=25
 quality=good
 speed=0
 profile=0
 qmax=51
 qmin=11
 slices=4
 vb=2M
 
 #ignored unless using -pass 2
 maxrate=24M
 minrate=100k
 arnr_max_frames=7
 arnr_strength=5
 arnr_type=3