GstVaCodecAlphaDecodeBin 

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstBin
                    ╰──GstVaCodecAlphaDecodeBin

Base class for VA-API based decoder for alpha formats which come as a separate stream, typically found in VP8 and VP9.

Since : 1.24

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