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

[Denis Shienkov]

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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