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• Core : Exclude some keyboard keys to prevent revalidating the field

  24 février 2015, par Arkni

  Core : Exclude some keyboard keys to prevent revalidating the field
  Avoid revalidate the field when pressing one of the following keys
  
   in ’onkeyup’ method :
  
  	Shift       => 16
  
  	Alt         => 18
  
  	Caps lock   => 20
  
  	End         => 35
  
  	Home        => 36
  
  	Left arrow  => 37
  
  	Up arrow    => 38
  
  	Right arrow => 39
  
  	Down arrow  => 40
  
  	Insert      => 45
  
  	Num lock    => 144
  
  	AltGr key   => 225
  This helps especially with the remote method, which has a lot of
  
  overhead.
  Closes #1411
  

• ffmpeg : avoid scanf in keyboard command parsing

  3 août 2015, par Hendrik Leppkes

  ffmpeg : avoid scanf in keyboard command parsing
  Mixing stdio and low-level IO on stdin is not safe.
  

  • [DH] ffmpeg.c

• How to make QProcess stop by button or keyboard in GUI ?

  31 août 2015, par xiaowei

  Here I want to make a recorder by ffmpeg.exe.

  And, I found the commend line, succeed running and generate the video file. And I know press "Esc" or "q" on keyboard can terminal

  Now, I want to use GUI to control the recoder(ffmpeg.exe). I select Qt here, and my work environment is windows 7 sp1.

  I use QProcess to execute it, you will see following.

  But I have no idea for terminal the process.

  The code list :
  main.cpp is simple.

  #include "mainwindow.h"
  
  #include <qapplication>
  
  
  
  int main(int argc, char *argv[])
  
  {
  
      QApplication a(argc, argv);
  
      MainWindow w;
  
      w.show();
  
  
  
      return a.exec();
  
  }
  
  </qapplication>

  mainwindow.h

  #ifndef MAINWINDOW_H
  
  #define MAINWINDOW_H
  
  
  
  #include <qmainwindow>
  
  #include <qprocess>
  
  
  
  namespace Ui {
  
  class MainWindow;
  
  }
  
  
  
  class MainWindow : public QMainWindow
  
  {
  
      Q_OBJECT
  
  
  
  public:
  
      explicit MainWindow(QWidget *parent = 0);
  
      ~MainWindow();
  
  
  
  private:
  
      QProcess *pro;
  
      QString recorder;
  
      QString outputName;
  
      QString options;
  
  
  
  private slots:
  
      void startRecode();
  
      void stopRecode();
  
  };
  
  
  
  #endif // MAINWINDOW_H
  
  </qprocess></qmainwindow>

  mainwindow.cpp

  #include "mainwindow.h"
  
  
  
  #include <qprocess>
  
  #include <qtest>
  
  #include <qpushbutton>
  
  #include <qvboxlayout>
  
  
  
  MainWindow::MainWindow(QWidget *parent) :
  
      QMainWindow(parent),
  
      pro(new QProcess)
  
  {
  
      QDateTime current_date_time = QDateTime::currentDateTime();
  
      QString current_date = current_date_time.toString("yyyy-MM-dd-hh_mm_ss");
  
  
  
      recorder = "E:\\bin\\ffmpeg.exe";
  
      outputName = current_date + ".mp4";
  
      options = "-f gdigrab -framerate 6 -i desktop -vcodec libx264 -preset:v ultrafast -tune:v zerolatency -hide_banner -report";
  
      //-t 00:00:05"; this option can limit the process running time, and work well no GUI, but I don't want to use given time to stop recording.
  
  
  
      QWidget *centerWindow = new QWidget;
  
      setCentralWidget(centerWindow);
  
  
  
      QVBoxLayout *mainLayout = new QVBoxLayout;
  
      QPushButton *startButton = new QPushButton("start recording");
  
      QPushButton *stopButton = new QPushButton("stop recording");
  
      mainLayout->addWidget(startButton);
  
      mainLayout->addWidget(stopButton);
  
  
  
      centerWindow->setLayout(mainLayout);
  
  
  
      connect(startButton, SIGNAL(clicked()), this, SLOT(startRecode()));
  
      connect(stopButton, SIGNAL(clicked()), this, SLOT(stopRecode()));
  
  }
  
  
  
  MainWindow::~MainWindow()
  
  {
  
      delete pro;
  
  }
  
  
  
  void MainWindow::startRecode()
  
  {
  
      pro->execute(QString(recorder + " " +options +" " + outputName));
  
  }
  
  
  
  void MainWindow::stopRecode(){
  
      pro->terminate(); // not work
  
      //pro->close(); // not work, too
  
      //pro->kill(); // not work, T_T
  
  
  
      //how to terminate the process by pushbutton??
  
  }
  
  </qvboxlayout></qpushbutton></qtest></qprocess>

  There have some ideas for me ?

  or, have other solutions for my recorder ?