How to provide hardware accelerated media playback in Raspberry Pi
How we can use hardware accelerated video playback in Qt5.9
this depends on the backend used by QtMultimedia. Qt just receives the frame data, but where/how it was decoded is of no interest for Qt itself.
For example GStreamer 1.0 should support HW playback IIRC.
My Qt framework 5.9 is build ed with the support of Gstreamer1.0 backend. But installing gstreamer-omx is not giving me accelerated media playback .