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QVideoWidget vs QGraphicsVideoItem

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

    Hi and welcome to devnet,

    Basically, the architecture behind both are not the same.

    What kind of video are you trying to play ? Why would you need a QGraphicsView for that ?

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

    Z 1 Reply Last reply
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    • SGaistS SGaist

      Hi and welcome to devnet,

      Basically, the architecture behind both are not the same.

      What kind of video are you trying to play ? Why would you need a QGraphicsView for that ?

      Z Offline
      Z Offline
      zahi.mashael
      wrote on last edited by
      #3

      @SGaist
      The video is a test video downloaded from youtube. For example https://www.youtube.com/watch?v=qPTfXwPf_HM converted and downloaded by http://convert2mp3.net/. Using another video formats than mp4 doesn't change anything on this fact.

      I am trying to create a template as a multimedia widget in what user can compose different items like video, picture, graphics or animating texts for rendering on a screen. I have just startet to evaluate QGraphicsView for this purpose.

      Thanks

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

        Then I'd recommend taking a look at QtQuick for that kind of stuff.

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

        Z 1 Reply Last reply
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        • SGaistS SGaist

          Then I'd recommend taking a look at QtQuick for that kind of stuff.

          Z Offline
          Z Offline
          zahi.mashael
          wrote on last edited by
          #5

          @SGaist
          Hi,
          I looked at the examples qmlvideo and qmlvideofx from qt 5.9 which are implemented with QtQuick 2 and they have apparently the same problem. QVideoWidget have the best rendering behavior also compared to the QtQuick option in my opinion. With QVideoWidget there is no pixelization and no erratic playback. I don't know what the problem here.

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          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #6

            What are your platform and Qt version ?

            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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            • SGaistS SGaist

              What are your platform and Qt version ?

              Z Offline
              Z Offline
              zahi.mashael
              wrote on last edited by
              #7

              @SGaist
              I work with Windows 7 and 10. Qt Version is 5.9. I have also installed K-lite codec 13.3.3

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #8

                Which version of 5.9 ?

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

                Z 1 Reply Last reply
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                • SGaistS SGaist

                  Which version of 5.9 ?

                  Z Offline
                  Z Offline
                  zahi.mashael
                  wrote on last edited by
                  #9

                  @SGaist
                  I use Qt 5.9.1 MSVC 2015, 32 bit and MinGW32 bit - Open Source (LGPLv3).

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                  • K Offline
                    K Offline
                    kuzulis
                    Qt Champions 2020
                    wrote on last edited by
                    #10

                    QtMM has a lot of issues, it sucks. You can try to use libVLC, ffmpeg or to use DirectShow directly (of course, if a Windows is your main platform).

                    Z 1 Reply Last reply
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                    • K kuzulis

                      QtMM has a lot of issues, it sucks. You can try to use libVLC, ffmpeg or to use DirectShow directly (of course, if a Windows is your main platform).

                      Z Offline
                      Z Offline
                      zahi.mashael
                      wrote on last edited by
                      #11

                      @kuzulis
                      Thanks for response.
                      I have tried libVLC with QWidget and it works very well. But is there is a possibility to use it in QGraphicsScene?

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                      • K Offline
                        K Offline
                        kuzulis
                        Qt Champions 2020
                        wrote on last edited by
                        #12

                        @zahi.mashael said in QVideoWidget vs QGraphicsVideoItem:

                        But is there is a possibility to use it in QGraphicsScene?

                        I don't know.

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #13

                          The VLC-Qt project provides integration with Qt so you should be able to use QGraphicsWidgetProxy.

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

                          G 1 Reply Last reply
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                          • Z Offline
                            Z Offline
                            zahi.mashael
                            wrote on last edited by zahi.mashael
                            #14

                            I tried to use VLC-Qt with QGraphicsProxyWidget class, but just sound is played not the video. Another peaple have already posted a similar problem with QVideoWidget like here.

                            I found now a solution for me with QtAV that uses ffmpeg. QtAV contains the class GraphicsItemRenderer that is a sub class of QGraphicsObject. So objects of GraphicsItemRenderer can be added directly to QGraphicsScene. Here is some code that demonstrate this (QtAV must be firstly installed in Qt, see installation instruction):

                            #include <QApplication>
                            #include <QtAVWidgets>
                            #include <QtAV>
                            #include <QGraphicsView>
                            
                            using namespace QtAV;
                            
                            int main(int argc, char *argv[])
                            {
                               QApplication a(argc, argv);
                            
                               AVPlayer player;
                            
                               GraphicsItemRenderer *item = new GraphicsItemRenderer;
                               item->resizeRenderer(640, 360);
                               item->setOutAspectRatioMode(VideoRenderer::VideoAspectRatio);
                               player.setRenderer(item);
                               QGraphicsScene *scene = new QGraphicsScene;
                               scene->addItem(item);
                               QGraphicsView *view = new QGraphicsView(scene);
                               view->show();
                               player.play("C:/path/to/file.mp4");
                               return a.exec();
                            }
                            

                            QtAV also have a qml integration, so I have now the freedom to choose between QGraphicsView or QtQuick.

                            I would like to thanks all very much for the tips. It was a great help.

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                            • SGaistS SGaist

                              The VLC-Qt project provides integration with Qt so you should be able to use QGraphicsWidgetProxy.

                              G Offline
                              G Offline
                              goldstar2154
                              wrote on last edited by
                              #15

                              @SGaist said in QVideoWidget vs QGraphicsVideoItem:

                              The VLC-Qt project provides integration with Qt so you should be able to use QGraphicsWidgetProxy.

                              Unfortunatelly Qt-vlc does not support embedding into QGraphicsScene by issue
                              https://github.com/vlc-qt/vlc-qt/issues/129

                              @zahi-mashael , is QtAv good solution? can you pls say about performance during playing fullHD(1920x1080x60fps) video?
                              I have a big troubles with QVideoWidget when it using like background video-player into QGraphicsScene, fps less than 5, it's horrible)

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                              • G goldstar2154

                                @SGaist said in QVideoWidget vs QGraphicsVideoItem:

                                The VLC-Qt project provides integration with Qt so you should be able to use QGraphicsWidgetProxy.

                                Unfortunatelly Qt-vlc does not support embedding into QGraphicsScene by issue
                                https://github.com/vlc-qt/vlc-qt/issues/129

                                @zahi-mashael , is QtAv good solution? can you pls say about performance during playing fullHD(1920x1080x60fps) video?
                                I have a big troubles with QVideoWidget when it using like background video-player into QGraphicsScene, fps less than 5, it's horrible)

                                Z Offline
                                Z Offline
                                zahi.mashael
                                wrote on last edited by zahi.mashael
                                #16

                                @goldstar2154 Yes, it seems so. I played a mp4 file in Full HD, a file about 64 MB big with 2.5 minutes length, and it worked.

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                                • G goldstar2154

                                  @SGaist said in QVideoWidget vs QGraphicsVideoItem:

                                  The VLC-Qt project provides integration with Qt so you should be able to use QGraphicsWidgetProxy.

                                  Unfortunatelly Qt-vlc does not support embedding into QGraphicsScene by issue
                                  https://github.com/vlc-qt/vlc-qt/issues/129

                                  @zahi-mashael , is QtAv good solution? can you pls say about performance during playing fullHD(1920x1080x60fps) video?
                                  I have a big troubles with QVideoWidget when it using like background video-player into QGraphicsScene, fps less than 5, it's horrible)

                                  Z Offline
                                  Z Offline
                                  zahi.mashael
                                  wrote on last edited by
                                  #17

                                  @goldstar2154 OK, I compared QtAV to vlc with many videos, and vlc always plays videos even better than QtAV. QtAV plays full HD videos especially in qml or as an QGraphicsItem (GraphicsItemRenderer) choppy. In vlc playing video is perfectly smooth.
                                  I am not an expert in ffmpeg and QtAV, and there are certainly some options that can be set to improve the performance and quality of the rendering.
                                  I am trying now to use vlc in qtquick...

                                  G 1 Reply Last reply
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                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #18

                                    Again, the VLC-Qt project might interest you, They provide QML components.

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

                                    Z 1 Reply Last reply
                                    0
                                    • SGaistS SGaist

                                      Again, the VLC-Qt project might interest you, They provide QML components.

                                      Z Offline
                                      Z Offline
                                      zahi.mashael
                                      wrote on last edited by
                                      #19

                                      @SGaist Yes. I am now working with it.

                                      1 Reply Last reply
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                                      • Z zahi.mashael

                                        @goldstar2154 OK, I compared QtAV to vlc with many videos, and vlc always plays videos even better than QtAV. QtAV plays full HD videos especially in qml or as an QGraphicsItem (GraphicsItemRenderer) choppy. In vlc playing video is perfectly smooth.
                                        I am not an expert in ffmpeg and QtAV, and there are certainly some options that can be set to improve the performance and quality of the rendering.
                                        I am trying now to use vlc in qtquick...

                                        G Offline
                                        G Offline
                                        goldstar2154
                                        wrote on last edited by
                                        #20

                                        @zahi.mashael Qt-Av provide qml components too, if you have time can you please compare Qt-av & Qt-vlc qml components? it will be interesting.

                                        Z 1 Reply Last reply
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                                        • G goldstar2154

                                          @zahi.mashael Qt-Av provide qml components too, if you have time can you please compare Qt-av & Qt-vlc qml components? it will be interesting.

                                          Z Offline
                                          Z Offline
                                          zahi.mashael
                                          wrote on last edited by zahi.mashael
                                          #21

                                          @goldstar2154 I have already compared the two components and VLC-Qt qml is in my opinion better. I tested with a video that was created in adobe (1920x1080x30fps) with some move animations and movements""stutter" more with QtAV than with VLC-Qt.

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