- 
    Suggestion 
- 
    Resolution: Done
- 
    P2: Important 
- 
    5.0.0, 5.1.0 , 5.2.0, 5.3.0, 5.4.0, 5.8.0 RC
- 
    None
- 
    Linux, GStreamer, VAAPI 
libva based video codec take the advantage of hardware for video decode/encode, it uses customized gst buffer(GstVaBuffer). this GstVaBuffer can convert into Pixmap for rendering.
we need add support for this GstVaBuffer in Qt Multimedia.
Without this, Qt Multimedia cannot use HW-accelerated decoding even if available on the platform.
This is especially needed for embedded systems.