Support VP9 CodecPrivate in WebM
There is a spec here https://www.webmproject.org/docs/container/#vp9-codec-feature-metadata-codecprivate
It exists in MP4 and is needed to select the proper hardware acceleration in players.
There is a spec here https://www.webmproject.org/docs/container/#vp9-codec-feature-metadata-codecprivate
It exists in MP4 and is needed to select the proper hardware acceleration in players.