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 !