QT 5.4.0 Camera not working on BeagleBone Black



  • Hi all,

    I'm trying to get a camera application running on the BeagleBone Black with Qt 5.4.0 and gstreamer-0.10.36. I have done some troubleshooting and I have isolated the error down to Qt identifying the available cameras on the board.

    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
    foreach (const QCameraInfo &cameraInfo, cameras)
        qDebug() << cameraInfo.deviceName();
    

    When I run this I get the following error:

    beaglebone:~# ./demo-camera -platform linuxfb
    ** (demo-camera:279): CRITICAL **: gst_photography_set_focus_mode: assertion 'photo != NULL' failed
    

    Now I have validated that the camera works with gstreamer and I can setup a pipeline to the screen to see a good video feed:

    beaglebone:~# gst-launch-0.10 -e v4l2src ! video/x-raw-yuv,width=320,height=240 ! fbdevsink
    

    Anyone have any ideas on what could be causing this gst_photography_set_focus_mode error?

    Thanks



  • Hi
    last year I encountered the same problem.
    Can you verify on which /dev your camera is?
    I assume that it is /dev/video1.

    In the source of multimedia backends gstreamer you can see that the programmed it fix to /dev/video0.
    This is one of the deepest and darkest places of the qt code. :-)
    It is Nokia legacy code which finally was rewritten to support gstreamer 1.x with Qt5.5

    Maybe you can test it with Qt5.5 alpha and gstreamer 1.x

    Best regards

    Juergen


Log in to reply
 

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.