codecalphademux
Extracts the CODEC (typically VP8/VP9) alpha stream stored as meta and exposes it as a stream. This element allow using single stream VP8/9 decoders in order to decode both streams.
Example launch line
 gst-launch-1.0 -v filesrc location=transparency.webm ! matroskademux ! 
     codecalphademux name=d
     d.video ! queue ! vp9dec ! autovideosink
     d.alpha ! queue ! vp9dec ! autovideosink
This pipeline splits and decode the video and the alpha stream, showing the result on seperate windows.
Hierarchy
GObject ╰──GInitiallyUnowned ╰──GstObject ╰──GstElement ╰──codecalphademux
Factory details
Authors: – Nicolas Dufresne 
Classification: – Codec/Demuxer
Rank – none
Plugin – codecalpha
Package – GStreamer Bad Plug-ins
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