How to stream a video frame by frame from sys1 to a qt-application on sys2 and display it in real time, on linux

Pooja Bhusare

I want to implement GStreamer pipeline using UDP socket and display that video ion QT.
I am using QT 5.12.9 version.
I want to run server command in one terminal and client should be in Qt app so it will display video in widgets.
Server: $gst-launch-1.0 -v filesrc location =<file_path/>video_test.mp4 ! qtdemux ! video/x-h264 ! rtph264pay ! udpsink host=127.0.0.1 port=8000

client $@client: $gst-launch-1.0 -v udpsrc port=8000 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96" ! rtph264depay ! decodebin ! videoconvert ! filesink location=a.mp4

#include "dialog.h"
#include <QApplication>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QDebug>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //Dialog w;
    //w.show();
     QMediaPlayer* player =new QMediaPlayer;
     QVideoWidget* vw= new QVideoWidget;
     player->setVideoOutput(vw);
     player->setMedia(QUrl::fromLocalFile("/video_test.mp4"));
     vw->setGeometry(100,100,300,400);
     vw->show();
     player->play();
     qDebug() <<player->state();
     return a.exec();
}

``

please any one help me.

Pooja Bhusare

#include "dialog.h"
#include <QApplication>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QDebug>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //Dialog w;
    //w.show();
     QMediaPlayer* player =new QMediaPlayer;
     QVideoWidget* vw= new QVideoWidget;
     player->setVideoOutput(vw);
    player->setMedia(QUrl("gst-pipeline: videotestsrc ! autovideosink"));
     vw->setGeometry(100,100,300,400);
     vw->show();
     player->play();
     qDebug() <<player->state();
     return a.exec();
}

I am trying to integrate the :player->setMedia(QUrl("gst-pipeline: videotestsrc ! autovideosink")); in app but showing me follows error : Error: "No URI handler implemented for "gst-pipeline"."

SGaist

Hi,

Are you sure you are using the correct version of Qt to build and run your application ?

Pooja Bhusare

@SGaist yes QT 5.12.9 version and trying to integrate

player->setMedia(QUrl("gst-pipeline: videotestsrc ! autovideosink"));

SGaist

How are you running your application ?
From your error, it looks like you are using an older version of Qt.

Pooja Bhusare

@SGaist
I am building my application
@command line: $qmake
$make
$./video_play.
by following above sequence it shows me blank screen of Qt widgets.
** if launch Qt gui from path: $cd qt.5.12.9/Tools/QtCreator/bin
$ ./qtcreator
if i press build and run option its shows me error like :
QMediaPlayer::StoppedState
Error: "No URI handler implemented for "gst-pipeline"."

jsulm

@Pooja-Bhusare said in How to stream a video frame by frame from sys1 to a qt-application on sys2 and display it in real time, on linux:

qmake

Are you sure you're using the correct qmake here? Use absolute path to qmake from Qt installation you want to use.

Pooja Bhusare

@jsulm
$qmake -version
QMake version 3.1
Using Qt version 5.12.9 in /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib

SGaist

What do you get if you call ldd your_application_name ?

Pooja Bhusare

@SGaist linux-vdso.so.1 => (0x00007ffdebed9000)
libQt5MultimediaWidgets.so.5 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libQt5MultimediaWidgets.so.5 (0x00007f15c7fc9000)
libQt5Multimedia.so.5 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libQt5Multimedia.so.5 (0x00007f15c7cbc000)
libQt5Widgets.so.5 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libQt5Widgets.so.5 (0x00007f15c746d000)
libQt5Core.so.5 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libQt5Core.so.5 (0x00007f15c6cd2000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f15c6950000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f15c673a000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f15c6370000)
libQt5Gui.so.5 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libQt5Gui.so.5 (0x00007f15c5b21000)
libQt5Network.so.5 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libQt5Network.so.5 (0x00007f15c5779000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f15c555c000)
libpulse-mainloop-glib.so.0 => /usr/lib/x86_64-linux-gnu/libpulse-mainloop-glib.so.0 (0x00007f15c5357000)
libpulse.so.0 => /usr/lib/x86_64-linux-gnu/libpulse.so.0 (0x00007f15c5107000)
libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f15c4df6000)
libQt5OpenGL.so.5 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libQt5OpenGL.so.5 (0x00007f15c4b9f000)
libGL.so.1 => /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 (0x00007f15c492b000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f15c4622000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f15c4408000)
libicui18n.so.56 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libicui18n.so.56 (0x00007f15c3f6f000)
libicuuc.so.56 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libicuuc.so.56 (0x00007f15c3bb7000)
libicudata.so.56 => /<PATH>/QT_5_12_9/5.12.9/gcc_64/lib/libicudata.so.56 (0x00007f15c21d4000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f15c1fd0000)
libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f15c1dce000)
/lib64/ld-linux-x86-64.so.2 (0x00007f15c81e7000)
libpulsecommon-8.0.so => /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-8.0.so (0x00007f15c1b51000)
libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f15c1905000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f15c1695000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f15c146c000)
libxcb-dri3.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri3.so.0 (0x00007f15c1269000)
libxcb-present.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-present.so.0 (0x00007f15c1066000)
libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f15c0e5f000)
libxshmfence.so.1 => /usr/lib/x86_64-linux-gnu/libxshmfence.so.1 (0x00007f15c0c5c000)
libglapi.so.0 => /usr/lib/x86_64-linux-gnu/libglapi.so.0 (0x00007f15c0a2b000)
libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f15c0819000)
libXdamage.so.1 => /usr/lib/x86_64-linux-gnu/libXdamage.so.1 (0x00007f15c0616000)
libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f15c0410000)
libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f15c020e000)
libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f15bfed4000)
libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007f15bfcbb000)
libxcb-dri2.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0 (0x00007f15bfab6000)
libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f15bf894000)
libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007f15bf68e000)
libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 (0x00007f15bf47c000)
libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f15c834c000)
libwrap.so.0 => /lib/x86_64-linux-gnu/libwrap.so.0 (0x00007f15bf272000)
libsndfile.so.1 => /usr/lib/x86_64-linux-gnu/libsndfile.so.1 (0x00007f15bf008000)
libasyncns.so.0 => /usr/lib/x86_64-linux-gnu/libasyncns.so.0 (0x00007f15bee02000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f15bebfa000)
libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f15be9f6000)
libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f15be7f0000)
libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007f15be5ce000)
liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f15be3ac000)
libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f15be0cb000)
libnsl.so.1 => /lib/x86_64-linux-gnu/libnsl.so.1 (0x00007f15bdeb2000)
libFLAC.so.8 => /usr/lib/x86_64-linux-gnu/libFLAC.so.8 (0x00007f15bdc3d000)
libvorbisenc.so.2 => /usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 (0x00007f15bd994000)
libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007f15bd779000)
libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f15bd565000)
libogg.so.0 => /usr/lib/x86_64-linux-gnu/libogg.so.0 (0x00007f15bd35c000)
libvorbis.so.0 => /usr/lib/x86_64-linux-gnu/libvorbis.so.0 (0x00007f15bd131000)