VideoSink frame to image does not work on android

I have a QML Module that decodes QR codes. I am using QtMultimedia for desktop and Android.

I am using a video sink for inspecting every frame from the camera like

QObject::connect(videoSink,&QVideoSink::videoFrameChanged,this,[=](const QVideoFrame & Vframe)
                     {

                         if(m_camera&&m_camera->isActive()&&Vframe.isValid()){
                             auto picture=Vframe.toImage();
                             WasmImageProvider::img=picture;
                             setid();
                             if(m_state)
                             {
                                 auto var = std::thread(&QRImageDecoder::decodePicture, this,picture);
                                 var.detach();
                             }
                         }
                     });

In Android, the camera preview is not shown, shows a black screen, and the qr can not be decoded.

It seems that `auto picture=Vframe.toImage();` return a black QImage. I have tried mapping the frame, setting RHS of the videosink to nullptr. However, I am not able to see the image from the camera on android.
The videosink and the `videoFrameChanged` signal work well on Linux.

The repo contains an example using the camera inside QtQrDec folder.

To build the example just set the CMake option BUILD_EXAMPLES=ON.
Then one can deploy the `qrcam` target to the Android device.