[Interest] Utilizing the GPU, how to start?

Giuseppe D'Angelo giuseppe.dangelo at kdab.com
Fri Jul 8 19:11:06 CEST 2016

Il 06/07/2016 18:19, Jason H ha scritto:

> What others have not said:
> I did extensive testing of Qt Quick1 with video playback.

This is a chapter on its own. (By the way, Qt Quick 1 is still 

In case of video playback, there's much more going on than using the GPU 
for displaying the video. You want to use the GPU also to decode the 
video stream (using whatever native APIs you have on your system) and, 
in order to display it, it's not guaranteed at all the using OpenGL is 
actually the best way.

Other overlaying solutions are usually much, much better 
performance-wise (e.g. VDPAU). But: they don't allow you to embed the 
video in arbitrary UI hierarchies. Media players usually have very 
complex setups in order to be able to switch between presentation 
backends when f.i. you set a videoplayer full screen rather than windowed.

Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (UK) Ltd., a KDAB Group company | Tel: UK +44-1625-809908
KDAB - The Qt Experts

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