I am trying to stream a video over tcp based on gstreamer daemon.
I have created a pipeline which streams video over tcp socket as below:
pipeline_create p videotestsrc is-live=true pattern="ball" ! x264enc ! queue ! mpegtsmux ! tcpserversink host=0.0.0.0 port=12345
Now I am designing a Video player application in Qt, which will receive the above video stream and play it.The code is as below
#include "dialog.h"
#include <QApplication>
#include<QMediaPlayer>
#include<QVideoWidget>
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);
QUrl *url=new QUrl("http://127.0.0.1:12345");
QMediaContent *mc=new QMediaContent(*url);
player->setMedia(*mc);
vw->setGeometry(100,100,300,400);
vw->show();
player->play();
qDebug()<<player->state();
return a.exec();
}
At first when I got the error code 0x80040266, I Installed K-lite codec and LAV Filters and after that only for the first time my video player was able to stream and play the video as shown.
But then, when I again try to play my video player, it shows below error
DirectShowPlayerService::doRender: Unresolved error code 0x80040266 (IDispatch error #102)
Can anyone guide me with this?
Download K-Lite Codec Pack and install on your system may be it will be solve your error
Related
I am currently having some trouble debugging a program that starts processes via QProcess.
Simply executing the binary without dbg works just fine but when I try to debug the executable with gdb I am getting a SIGTRAP when the process has started.
After that the stack always shows '??' instead of function names.
When continuing I get a SIGILL.
I found out that the trap is not caused when no breakpoint is set.
In my project I also get following output:
Probes-based dynamic linker interface failed.
I am not sure whether this is related to loaded plugins or libraries.
The problem can be reproduced (except from the " Probes-based dynamic linker interface failed." output) with the following code:
#include <QCoreApplication>
#include <QProcess>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QProcess proc;
QString exe = "echo";
QStringList arguments;
arguments << "Test";
proc.start(exe, arguments);
if (!proc.waitForFinished()) {
qDebug() << "failed to start" << proc.exitCode() << proc.errorString();
}
qDebug() << "process finished";
qDebug() << proc.readAllStandardOutput();
return a.exec();
}
My OS is arch linux (up to date)
Qt5: qt5-base 5.15.1-1
GDB: gdb 9.2-1
clang++: clang 10.0.1-1
Does anybody have an idea what is causing the SIGTRAP when debugging with dbg?
I am relatively new to Qt and was going through many tutorials. Everything was fine. All scripts compiled and ran.
Then, at some point, I am getting the error for even a new Qt widget application created with Qt Creator 4.3.1:
C:\ \Documents\111\main.cpp:-1: In function 'int qMain(int, char**)':
C:\ \Documents\111\main.cpp:6: error: variable 'QApplication a' has initializer but incomplete type
QApplication a(argc, argv);
^
C:\ \Documents\111\main.cpp:11: warning: control reaches end of non-void function [-Wreturn-type]
}
^
I am not sure what happened, yet seems like some setups were messed up.
QApplication is included, and not missing in the script.
111.pro
# Project created by QtCreator 2018-02-23T01:36:28
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = 111
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp \
mainwindow.cpp
HEADERS += \
mainwindow.h
FORMS += \
mainwindow.ui
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainview.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
It seems to me that this issue appeared after trying to run qt5.6_src.zip examples from https://en.ids-imaging.com/open-source.html.
Without completed code, I guess you need to add #include <QApplication> to main.cpp
The error message told you what is missing.
According to Qt's docs, the constructor's signature is QApplication(int &argc, char **argv).
Therefore, if you inherit from QApplication then the subclass's constructor must pass argc by reference. From your description, it appears that the constructor of your subclass is actually passing argc by value (i.e., int qMain(int, char**) ). That will cause some problems.
The issue is fixed by deleting the Qt folder and QtCreator folder in the <drive>:\Users\<username>\AppData\Roaming\QtProject and <drive>:\Users\<username>\AppData\Roaming\Qt. It stored incorrect settings, which I somehow setup by running open source scripts. For more information visit Where does QtCreator save its settings?.
I've tried to embed emacs in a Qt Application using QX11EmbedContainer, and works but with two important exception. First of all, here is the code:
#include <QX11EmbedWidget>
#include <QtGui>
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QX11EmbedContainer container;
container.show();
container.resize(500, 500);
QProcess* process = new QProcess(&container);
QString executable("emacsclient");
QStringList arguments;
arguments << "--parent-id" << QString::number(container.winId());
process->start(executable, arguments);
int status = app.exec();
process->close();
return status;
}
And the compilation and execution line (and the previous thrown of the emacs server):
$ emacs -q --daemon &
// filtered output
$ g++ test.cpp -lQtGui -lQtCore -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4
$ ./a.out
And finally, the result:
But, when or if I try to write something in the minibuffer, the size of the widget is collapsed, and the focus is also lost:
If I make click in the (now shorter) widget, I can continue working with emacs without problems, but I should resize the window in order to emacs is expanded other time as originally.
Where is the problem?
Try using a layout.
Here is the Qt5 documentation on layout management.
hi i'm just trying to compile an easy project in qt
#include <QApplication>
#include <QPushButton>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QPushButton bouton("Salut les Zéros, la forme ?");
bouton.show();
return app.exec();
}
but i have this error : /home/eid/test/easyprojet/main.cpp:1: error: QApplication: No such file or directory
can anyone help me ?
sorry for my english
In Qt5, it resides in , while in Qt4 it was .
In Qt5 you need to add QT += widgets to your .pro file.
It may be also because the project is not in the workspace of QT creator.
It happened with me before.
so,try to put the project in the workspace .
i want to test whether qt is supporting VNC or not. For that i have written a small layout program using Qt library.
the source code for the layout program is as follows:
layout.cpp
#include <QApplication>
#include <QHBoxLayout>
#include <QSlider>
#include <QSpinBox>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget *window = new QWidget;
window->setWindowTitle("Enter The Age of the person");
QSpinBox *spinBox = new QSpinBox;
QSlider *slider = new QSlider(Qt::Horizontal);
spinBox->setRange(0, 130);
slider->setRange(0, 130);
QObject::connect(spinBox, SIGNAL(valueChanged(int)),
slider, SLOT(setValue(int)));
QObject::connect(slider, SIGNAL(valueChanged(int)),
spinBox, SLOT(setValue(int)));
spinBox->setValue(35);
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window->setLayout(layout);
window->show();
return app.exec();
}
i want to run this as server application on my linux PC.For that what i configured Qt and installed like this.
./configure -qt-gfx-vnc
make
make install
The program is working fine. But if i run the application as VNC server application like
./layout -qws -display VNC:0
i am encountering an error.it says that
"_X11TransSocketINETConnect() can't get address for VNC:6000: Temporary failure in name resolution"..
pls help me what i need to do.
Thanks
You did not configure Qt to use QWS, which is what you wanted.
For this reason, it looks like your app is silently ignoring the -qws option, and the -display VNC:0 option is causing it to try to connect to the X11 display number 0 on host VNC, which doesn't exist.
You need to pass the -embedded option when configuring Qt if you want to use QWS.