Displaying camera stream with qmlglsink crashes in gcoTEXTURE_GetMipMap() from gcnano stack

[OL'He.1]

We want to display a camera stream in a QML application on our STM32MP157C-based board. When we use the default QML widgets, the framerate is too low, under 10 fps.

We try to solve the problem by using GStreamer's qmlglsink with GstGLVideoItem: it works on PC, but on the STM32MP157C it crashes with a segmentation fault in the "gcoTEXTURE_GetMipMap()" function, provided by the GCnano firmware. The GCnano source code is not available.

How could we solve the crash?

Note: more complete description on https://community.st.com/s/question/0D53W00000Mh8kqSAB/hellowe-have-an-issue-with-qml-multimedia-to-display-camera-stream-the-result-is-not-smooth-while-with-qt-widgets-it-works-fine-gstreamer-pipeline-from-command-line-works-as-well

[Olivier GALLIEN]

Hi @OL'He.1​ ,

Sorry for late reply on this topic.

Some improvement have been done around QT integration in our latest delivery V2.1 and we have publish this wiki page :

https://wiki.st.com/stm32mpu/wiki/How_to_build_and_use_an_SDK_for_QT

Could you please have a look and make a try ?

Let us know then the status to resume investigation if needed.

Hope it help,

OIivier

[OL'He.1]

Thanks Olivier.

We'll try OpenSTLinux-2.1, if you think it is likely to solve the problem.

Regards,

Olivier

[Olivier GALLIEN]

Hi @OL'He.1​ ,

Not 100% sure to be honest .. but anyway an improved environment worth to switch on prior to investigate further.

Thanks for your understanding.

Olivier

[CCour.1]

So we've done a test, with Wayland and EGLFS environment (just to be sure). And we don't notice any improvements in this area.

Even with "-no-feature-raster-64bit" option as suggested, the fps number is around 8-10 fps according to "qmlvideofx" demo app from Qt. Camera with QML app is a lot slower than with Qt widgets app.

The new gcnano firmware does not fix our crash with "qmlglsink".