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Get frames from qml videoOutput and send to TcpSocket.

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  • SGaistS SGaist

    Then what about using tools already made for that ?
    For example use GStreamer to stream your video and then your application just as a visualizer.

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    sharath
    wrote on last edited by sharath
    #5

    @SGaist I don't have knowledge on gstreamer. How can I use it in Qt? I have to make it possible in my application.

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

      Why is it constrained to your application only ?

      If you have a recent enough version of Qt, you might be able to use QMediaPlayer.

      Otherwise, you can also build the pipeline yourself use the GStreamer API.

      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

        Why is it constrained to your application only ?

        If you have a recent enough version of Qt, you might be able to use QMediaPlayer.

        Otherwise, you can also build the pipeline yourself use the GStreamer API.

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        sharath
        wrote on last edited by sharath
        #7

        @SGaist we have embedded device which has camera and GUI application and I want to view/control the liveview of that camera from my android/iOS application. So each video frames from my embedded device should transmit to mobile application.

        Qmediaplayer is only to play the media source if I'm not wrong.

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

          The link I provided shows you how to create a custom GStreamer pipeline where you can try to use a pipe so you can both show the stream on your device and have it streamed on the network.

          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

            The link I provided shows you how to create a custom GStreamer pipeline where you can try to use a pipe so you can both show the stream on your device and have it streamed on the network.

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            sharath
            wrote on last edited by sharath
            #9

            @SGaist thank you, I will look into it.

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            • SGaistS SGaist

              The link I provided shows you how to create a custom GStreamer pipeline where you can try to use a pipe so you can both show the stream on your device and have it streamed on the network.

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              sharath
              wrote on last edited by
              #10

              @SGaist gst-pipeline supports only after Qt5.12?

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

                Custom pipeline building in QMediaPlayer came in 5.12.2 like explained in the documentation.

                However nothing stops you from using other means to create the pipeline.

                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

                  Custom pipeline building in QMediaPlayer came in 5.12.2 like explained in the documentation.

                  However nothing stops you from using other means to create the pipeline.

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                  sharath
                  wrote on last edited by sharath
                  #12

                  @SGaist its very hard to understand GStreamer. How can i pass QML camera to Gstreamer? is there any example to stream live camera like sender and receiver? i know this is stupid question, but i'm not getting any input that from where to start.

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

                    As I already wrote, don't do that in that order.

                    Stream your camera using a dedicated software that will generate a real video stream.

                    Even if it's not simple, GStreamer allows you to show the feed locally and send it over the network at the same time.

                    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

                      As I already wrote, don't do that in that order.

                      Stream your camera using a dedicated software that will generate a real video stream.

                      Even if it's not simple, GStreamer allows you to show the feed locally and send it over the network at the same time.

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                      sharath
                      wrote on last edited by
                      #14

                      @SGaist If you provide some sample code that would really helpful.

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #15

                        Sample code of what ?

                        You do not even say what solution you want to implement.

                        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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                        • S sharath

                          @SGaist we have embedded device which has camera and GUI application and I want to view/control the liveview of that camera from my android/iOS application. So each video frames from my embedded device should transmit to mobile application.

                          Qmediaplayer is only to play the media source if I'm not wrong.

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                          sharath
                          wrote on last edited by
                          #16

                          @sharath said in Get frames from qml videoOutput and send to TcpSocket.:

                          we have embedded device which has camera and GUI application and I want to view/control the liveview of that camera from my android/iOS application. So each video frames from my embedded device should transmit to mobile application.

                          i want to use Gstreamer to stream the video over network(TCP). give some example code so that i can start.

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #17

                            Here you have an example using the command line to stream a video feed from a RaspberryPi. The streaming part will work the same on a computer.

                            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

                              Here you have an example using the command line to stream a video feed from a RaspberryPi. The streaming part will work the same on a computer.

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                              sharath
                              wrote on last edited by
                              #18

                              @SGaist Thank you. i will go through it

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                              • SGaistS SGaist

                                Here you have an example using the command line to stream a video feed from a RaspberryPi. The streaming part will work the same on a computer.

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                                sharath
                                wrote on last edited by
                                #19

                                Hello @SGaist, i just running the following commands to undertand Gstreamer on command line.
                                To send current screen to network:

                                gst-launch-1.0 -v ximagesrc use-damage=false xname=/usr/lib/torcs/torcs-bin ! videoconvert ! videoscale ! video/x-raw,format=I420,width=800,height=600,framerate=25/1 ! jpegenc ! rtpjpegpay ! udpsink host=127.0.0.1 port=5000
                                

                                To receive:

                                gst-launch-1.0 udpsrc port=5000 ! application/x-rtp,encoding-name=JPEG,payload=26 ! rtpjpegdepay ! jpegdec ! autovideosink
                                

                                here its sharing my current screen using ximagesrc to network.
                                So how can i send only current camera live view through Gstreamer. whats the command for that?

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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #20

                                  Did you even try to search for "GStreamer camera source" ?

                                  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

                                    Did you even try to search for "GStreamer camera source" ?

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                                    sharath
                                    wrote on last edited by sharath
                                    #21

                                    Thank you @SGaist,

                                    i tried below script on command line

                                    gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw-yuv,width=640,height=480' !  x264enc pass=qual quantizer=20 tune=zerolatency ! rtph264pay ! udpsink host=127.0.0.1 port=1234
                                    
                                    

                                    Got below error.

                                    (gst-launch-1.0:4420): GStreamer-WARNING **: 0.10-style raw video caps are being created. Should be video/x-raw,format=(string).. now.
                                    WARNING: erroneous pipeline: could not link v4l2src0 to x264enc0
                                    
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                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #22

                                      @sharath said in Get frames from qml videoOutput and send to TcpSocket.:

                                      WARNING: erroneous pipeline: could not link v4l2src0 to x264enc0

                                      The first hit for that search on DuckDuckGo gives several example pipelines to test with your own setup.

                                      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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