Memory leaks in QMediaPlayer and QVideoWidget

When using QMediaplayer and QVideoWidget to loop videos, memory usage increases and never get released. 

I attached a little QWidget based application which loops a small video with atwo second  gaps between the repeats.

Every repeat allocates memory via a QScopedPointer.

It is possible to activate QVideoWidget separatly to get a bigger leak.

Click Autoplay-checkbox to start.

Max shows the maximum memory consumption with the time it occurs and "Now" the current. 

I dicovered further, that even when if the QMediaplayer/QVideoWidget-Instances are created once and only videos changed it produces memory leaks.

Valgrind reports issues in gstreamer-libs and qtmultimedia-libs.

Reproduced under:
Kubuntu 16.04, 17.04 17.10
I got the same behavior with a QML (QQuickitem) based video player in Android.
Android 5.1.1 Android 6.0 Android 7.1
It seems, that every repeated allocation/deallocation of memory or even loading a file in QtMultimedia produced memory leaks.