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

Pad Templates

`alpha`

ANY

Presence – always

Direction – src

Object type – GstPad

`sink`

ANY

Presence – always

Direction – sink

Object type – GstPad

`src`

ANY

Presence – always

Direction – src

Object type – GstPad

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