Android: QVideoFrame::map succeeds, yet buffer contains only zero values

[cgudrian]

Hello!

I have created a simple QtQuick 2 application which displays a Camera preview using a VideoOutput with a filter attached to it. The VideoOutput shows the expected preview image.

Within the QVideoFilterRunnable::run() method I'm successfully calling the map() method on the provided QVideoFrame input parameter. However the buffer pointed to by QVideoFrame::bits() only contains zeros. This does not happen if the application runs in the Android simulator (which has OpenGL turned off).

Is there a known issue regarding the mapping of OpenGL video data?

Christian

[cgudrian]

Adding the Mali-T860 chipset to the blacklist solved the issue. Should I file a pull request?

[cgudrian]

Browsing through the Qt sources I've discovered, that certain GPU chipsets get a special treatment. Among others there are the chipsets Mali-T720 and Mali-T760. My device is equipped with a Mali-T860. I'll add that one to the blacklist as well and see where it gets me.

Christian

[cgudrian]

Adding the Mali-T860 chipset to the blacklist solved the issue. Should I file a pull request?

[SGaist]

Hi and welcome to devnet,

You can, but before doing it just check whether the 5.9 branch already contains it.

[SGaist]

Just in case, since you are talking about a pull request, the development is not done on GitHub you have to use Gerrit to get your patch reviewed an possibility integrated.

[cgudrian]

https://codereview.qt-project.org/#/c/187465/

[SGaist]

Thanks !