<NME> vp9
<BEF> ADDFILE
<MSG> Add avformat presets for VP8 and VP9 with alpha channel.

<DFF> @@ -0,0 +1,29 @@
+f=webm
+
+acodec=libopus
+ar=48000
+ab=128k
+
+vcodec=libvpx-vp9
+vb=2M
+g=120
+bf=2
+threads=0
+rc_lookahead=16
+quality=good
+speed=3
+vprofile=0
+qmax=51
+qmin=4
+slices=4
+tile-columns=6
+frame-parallel=1
+lag-in-frames=25
+row-mt=1
+auto-alt-ref=0
+mlt_image_format=rgb24a
+pix_fmt=yuva420p
+
+meta.preset.name=alpha/WebM VP9 with alpha channel
+meta.preset.extension=webm
+meta.preset.note=VP9 video with Opus audio in Matroska container: "Don't be evil"

{'addition_count': 29, 'commit_subject': 'Add avformat presets for VP8 and VP9 with alpha channel.', 'deletion_count': 0, 'file_extension': '', 'lang': 'vp9', 'license': 'lgpl-2.1', 'repo_name': 'mltframework/mlt'}