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Camera/Video Without OpenGL (Quick Renderer)

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #2

    Hi,

    What are the specs of the camera ?
    How fast is it supposed to be ?

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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    • K Offline
      K Offline
      kengineer
      wrote on last edited by
      #3

      720x480 SD, 30 fps - this is a pretty low quality camera, nothing super fancy. I can already utilize the camera in my system sans QT (using gstreamer or other tools) but want to integrate a live camera view into my UI application in certain cases.

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #4

        You can maybe use QtGStreamer for example.

        Is that a USB camera ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • K Offline
          K Offline
          kengineer
          wrote on last edited by
          #5

          No it's an embedded interface. That shouldn't matter though as it just appears as a standard V4L2 device (/dev/video)

          "Finally, when drawing on QtQuick2 (Qt5), the only way is to use qtquick2videosink."

          "If you are using QtQuick (either QtQuick1 with Qt4 or Qt5, or QtQuick2 with Qt5), there is also a "VideoItem" element available when you import "QtGStreamer 1.0". See the qmlplayer and qmlplayer2 examples for details."

          So does that mean I can still utilize the VideoItem element as long as I setup gstreamer to feed qtquick2videosink?

          K 1 Reply Last reply
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          • K kengineer

            No it's an embedded interface. That shouldn't matter though as it just appears as a standard V4L2 device (/dev/video)

            "Finally, when drawing on QtQuick2 (Qt5), the only way is to use qtquick2videosink."

            "If you are using QtQuick (either QtQuick1 with Qt4 or Qt5, or QtQuick2 with Qt5), there is also a "VideoItem" element available when you import "QtGStreamer 1.0". See the qmlplayer and qmlplayer2 examples for details."

            So does that mean I can still utilize the VideoItem element as long as I setup gstreamer to feed qtquick2videosink?

            K Offline
            K Offline
            kengineer
            wrote on last edited by
            #6

            Also since it says:
            "qtglvideosink and qtquick2videosink use OpenGL/OpenGLES and support hardware colorspace conversion and color balance."

            Wouldn't I have the same problem? OpenGL doesn't work well on my system.

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #7

              What system do you have ?

              What format is the image you receive ?

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • K Offline
                K Offline
                kengineer
                wrote on last edited by
                #8

                @SGaist said in Camera/Video Without OpenGL (Quick Renderer):

                do you have ?
                What format is the image

                It's a Cortex A5 based system with no GPU. The camera format is ITU601 - but ultimately, I just need to be able to display any old /dev/video device in my QML application window. Like I mentioned, I have already verified the interface as I can use gstreamer to output it to my display. I am just wondering if there are any alternatives to VideoOutput as this is directly reliant on OpenGL which I can't practically use on this system.

                That link seems to be saying that QtGstreamer still uses OpenGL correct? If it can only use OpenGL, then I would still have the same problem.

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #9

                  They also have widget sink.

                  In any case, this stack overflow answer might be an interesting starting point to push images to QtQuick from C++.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • K Offline
                    K Offline
                    kengineer
                    wrote on last edited by
                    #10

                    @SGaist said in Camera/Video Without OpenGL (Quick Renderer):

                    dget si

                    Well the widget sink would require the use of QWidgets correct? Not Quick/QML... I was wondering if there was any other way to implement video in QML but doesn't sound like there is.

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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #11

                      Sorry, I don't have deep enough knowledge of the Qt Quick Renderer to give you hints about how to implement a video item for it.

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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