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Efficient raw video display

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  • JoeCFDJ Offline
    JoeCFDJ Offline
    JoeCFD
    wrote on last edited by JoeCFD
    #5

    https://doc.qt.io/qt-5/qvideowidget.html#details
    Try to use qvideowidget

    QImage img = QImage("images/qt-logo.png").convertToFormat(QImage::Format_ARGB32);
    QVideoSurfaceFormat format(img.size(), QVideoFrame::Format_ARGB32);
    videoWidget = new QVideoWidget;
    videoWidget->videoSurface()->start(format);
    videoWidget->videoSurface()->present(img);
    videoWidget->show();

    1 Reply Last reply
    0
    • SGaistS SGaist

      The idea of a buffer is that you put the data to draw directly there not do additional back and forth.

      C Offline
      C Offline
      cposse
      wrote on last edited by
      #6

      @SGaist thank you very much for a non-answer. I have been programming for a few decades now, and the idea of a buffer can be any, according to the purpose you want to give it. The idea of a QOpenGLBuffer however is not very clear to me, and I can't seem to find relevant examples, and that's where I needed help.

      Not only did you not answer my questions, but you also managed to provide a patronising comment. Not exactly what I expected from someone that is awarded a title for years of helping people and contributing for an awesome project.

      So yes, thank you very much for pointing me in the right direction. However, that should not be an excuse for thinking you know more than others. If you have out grown the community, maybe it's time you find something else to do.

      JonBJ jsulmJ artwawA 3 Replies Last reply
      0
      • C cposse

        @SGaist thank you very much for a non-answer. I have been programming for a few decades now, and the idea of a buffer can be any, according to the purpose you want to give it. The idea of a QOpenGLBuffer however is not very clear to me, and I can't seem to find relevant examples, and that's where I needed help.

        Not only did you not answer my questions, but you also managed to provide a patronising comment. Not exactly what I expected from someone that is awarded a title for years of helping people and contributing for an awesome project.

        So yes, thank you very much for pointing me in the right direction. However, that should not be an excuse for thinking you know more than others. If you have out grown the community, maybe it's time you find something else to do.

        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #7

        @cposse Wow!

        1 Reply Last reply
        1
        • C cposse

          @SGaist thank you very much for a non-answer. I have been programming for a few decades now, and the idea of a buffer can be any, according to the purpose you want to give it. The idea of a QOpenGLBuffer however is not very clear to me, and I can't seem to find relevant examples, and that's where I needed help.

          Not only did you not answer my questions, but you also managed to provide a patronising comment. Not exactly what I expected from someone that is awarded a title for years of helping people and contributing for an awesome project.

          So yes, thank you very much for pointing me in the right direction. However, that should not be an excuse for thinking you know more than others. If you have out grown the community, maybe it's time you find something else to do.

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #8

          @cposse Please read and follow https://forum.qt.io/topic/113070/qt-code-of-conduct
          No need to insult other people here (or anywhere)!

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          C 1 Reply Last reply
          0
          • jsulmJ jsulm

            @cposse Please read and follow https://forum.qt.io/topic/113070/qt-code-of-conduct
            No need to insult other people here (or anywhere)!

            C Offline
            C Offline
            cposse
            wrote on last edited by
            #9

            @jsulm I understand that my comment does not follow the code of conduct and I can only apologise for that. I could've just closed the topic and continue with my day. However, I did not insult anyone.

            I asked for help and in return received a patronising comment. I felt disrespected and called out the behaviour of someone that, according to its title, should be the face of the code of conduct.

            JonBJ 1 Reply Last reply
            0
            • C cposse

              @jsulm I understand that my comment does not follow the code of conduct and I can only apologise for that. I could've just closed the topic and continue with my day. However, I did not insult anyone.

              I asked for help and in return received a patronising comment. I felt disrespected and called out the behaviour of someone that, according to its title, should be the face of the code of conduct.

              JonBJ Offline
              JonBJ Offline
              JonB
              wrote on last edited by
              #10

              @cposse
              I/we just don't see @SGaist's answers as having any "patronising" comments in them.

              One thing I would say: you are a new user, when we answer we have no idea what standard/background/knowledge posters have. If you look around you will see anything from full-blown experts to people who do not know the absolute basics of programming --- and I do mean basics. Please bear that in mind, it can be very difficult to know where to pitch one's answers, one person's "too simple" is another person's "too complex".

              C 1 Reply Last reply
              0
              • C cposse

                @SGaist thank you very much for a non-answer. I have been programming for a few decades now, and the idea of a buffer can be any, according to the purpose you want to give it. The idea of a QOpenGLBuffer however is not very clear to me, and I can't seem to find relevant examples, and that's where I needed help.

                Not only did you not answer my questions, but you also managed to provide a patronising comment. Not exactly what I expected from someone that is awarded a title for years of helping people and contributing for an awesome project.

                So yes, thank you very much for pointing me in the right direction. However, that should not be an excuse for thinking you know more than others. If you have out grown the community, maybe it's time you find something else to do.

                artwawA Offline
                artwawA Offline
                artwaw
                wrote on last edited by
                #11

                @cposse said in Efficient raw video display:

                I have been programming for a few decades now

                Please share where, I would not like to work with someone who possesses such self-entitlement level.

                Your profile gives literally nothing away as to what level of experience you have, nor do your posts such as they are and what's of them. And then you are offended. It is brilliant, in a fashion.

                For more information please re-read.

                Kind Regards,
                Artur

                1 Reply Last reply
                0
                • JonBJ JonB

                  @cposse
                  I/we just don't see @SGaist's answers as having any "patronising" comments in them.

                  One thing I would say: you are a new user, when we answer we have no idea what standard/background/knowledge posters have. If you look around you will see anything from full-blown experts to people who do not know the absolute basics of programming --- and I do mean basics. Please bear that in mind, it can be very difficult to know where to pitch one's answers, one person's "too simple" is another person's "too complex".

                  C Offline
                  C Offline
                  cposse
                  wrote on last edited by
                  #12

                  @JonB I can understand your point of view and acknowledge I am in the wrong and should've handled this way better. My analysis of @SGaist 's response as patronising is fully based on my experience/knowledge, and I failed to analyse it from a more general perspective.

                  I apologise to the whole community for my behaviour, especially @SGaist, and will do better in the future. Thank you all for the help.

                  1 Reply Last reply
                  3
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    @cposse apologies accepted (note that I don't make assumption on any level of knowledge of anybody here).

                    As we are talking about OpenGL specifically (which is one hell of a subject in itself), my answer was just geared toward that subject directly, though, I agree, it could have been more verbose. The original intent was for you to avoid creating an OpenGL buffer, putting the data there, grabbing it back, and then create a QImage to load again to the OpenGL context to finally show it.

                    The short way I suggest is, if possible, to do most if not all the tasks required directly on the GPU side. Performance wise it is where you will have most gains.

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

                    C 1 Reply Last reply
                    0
                    • SGaistS SGaist

                      @cposse apologies accepted (note that I don't make assumption on any level of knowledge of anybody here).

                      As we are talking about OpenGL specifically (which is one hell of a subject in itself), my answer was just geared toward that subject directly, though, I agree, it could have been more verbose. The original intent was for you to avoid creating an OpenGL buffer, putting the data there, grabbing it back, and then create a QImage to load again to the OpenGL context to finally show it.

                      The short way I suggest is, if possible, to do most if not all the tasks required directly on the GPU side. Performance wise it is where you will have most gains.

                      C Offline
                      C Offline
                      cposse
                      wrote on last edited by
                      #14

                      @SGaist Thank you for detailing the subject even after this discussion, and for all the contributions you have made. That will be the approach I'm going with.

                      1 Reply Last reply
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