[Development] QtMultimedia && QML - hard performance regressions on Windows

[Massimo Callegari]

Hey Denis, welcome to the "QtMultimedia lovers" club :)

Good luck with your remarks, most likely nobody will care. 
It seems that the primary role of QtMultimedia is to capture input video. All the rest doesn't matter.

I've opened a number of tickets and none of them have been solved:
https://bugreports.qt.io/browse/QTBUG-37004  (Feb 2014)
https://bugreports.qt.io/browse/QTBUG-37005  (Feb 2014)
https://bugreports.qt.io/browse/QTBUG-37882  (Mar 2014)
https://bugreports.qt.io/browse/QTBUG-42034  (Oct 2014)
https://bugreports.qt.io/browse/QTBUG-47284  (Jul 2015)

3 on 5 marked as P2.

I would also add a recent discovery of how non-cross platform QtMultimedia is.
The use case is starting a video in fullscreen on a second monitor (QtWidget way).
In Linux and OSX you have to do
m_videoWidget->setGeometry(rect);
m_videoWidget->setFullScreen(true);and on Windows
m_videoWidget->setFullScreen(true);
m_videoWidget->setGeometry(rect);

I didn't even open a ticket for that, cause I got tired to waste my time on this topic.


________________________________
Da: Denis Shienkov <denis.shienkov at gmail.com>
A: "development at qt-project.org" <development at qt-project.org> 
Inviato: Mercoledì 27 Aprile 2016 11:37
Oggetto: [Development] QtMultimedia && QML - hard performance regressions on    Windows



Hi developers.

I faced with a big problem with the video playback performance, when I 
try to open the mp4 video file from any of QML video examples. I have a high CPU loading (~40%) and the video is freezing and jerks. But the C++ media player works satisfactory, more or less tolerably (on point 3 from the 1-5 points)...

It is impossible to use at all in QML, I face more and more with the surprises of QtMultimedia, and disappointed more and more...  

WTF ? What sense in QtMultimedia if it does not work as expected?

PS: I have created a bug: https://bugreports.qt.io/browse/QTBUG-53019

BR,
Denis


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