f=webm

acodec=vorbis
ab=128k

vcodec=libvpx
g=120
rc_lookahead=16
quality=good
speed=0
vprofile=0
qmax=51
qmin=11
slices=4
vb=2M
maxrate=24M
minrate=100k
arnr_max_frames=7
arnr_strength=5
arnr_type=3
auto-alt-ref=0
mlt_image_format=rgb24a
pix_fmt=yuva420p

meta.preset.name=alpha/WebM VP8 with alpha channel
meta.preset.extension=webm
meta.preset.note=VP8 video with Ogg Vorbis audio in Matroska container: "Don't be evil"
