@vicky_mac The old gstreamer versions have memory leaks. Which gstreamer version are you using? Try to upgrade to the latest gstreamer.
Your Qt is old as well. Upgrade your Qt to at least 5.15.2.

As I mentioned, I would like to play with any style, so I guess I'm not able to hardcode use of Material style.

I was just mentioning that's how the video demonstrated.

Thanks to you I have the files in my test project and they are the files from my actual app, now
compiling seems to be the issue.

I had a couple things to do to get it build able again but now I can at least compile my c++ classes. I have one test with one of my objects now so thanks.

Hi,
thank you very much for your good answer,
and for the hint with the repeater, i will look for a better way to display the Items.

I found a reason. Wrong is 2 lines from TestOpenGL.cpp file, need replace them with only one line:

indices[i] = i; // indices[i * 2] = i * 2; // indices[i * 2 + 1] = i * 2 + 1;

Hi,

AFAIK and as silly as it may sound: because it's an iOS platform feature/constaint.

It started with the Retina displays. iOS applications would have to provide these images if they wanted to support these displays.

You can find more information about scalability here.

Hope it helps