Decoding a VP8 encoded AVI with alpha

[ABCThomas]

Hi,

I'm currently trying to use playbin and appsink to decode a VP8 encoded .avi
from file and copy the resulting frames to a DirectX texture. All this works
fine but I cannot seem to preserve the alpha channel of the video, it just
gets set to fully opaque.

I have a simple pipeline with playbin, videoconvert and appsink, I've tried
not applying a filter to videoconvert but I still get the same result.

Which leads to the question does the VP8 (or VP9) decoder in Gstreamer
support decoding of the alpha channel, if so does anyone know how to
preserve it when converting to an RGBA form ?

Cheers



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