QT Creator ( Cannot retrieve debugging output.) hatası ve logları görememe sorunu

QT Creator ( Cannot retrieve debugging output.) hatası ve logları görememe sorunu  ;

Birden fazla Qt Creator acık oldugu için veriliyordur bu hata

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QtConcurrent Kullanımı

QtConcurrent  mutex,semaphore gibi primitive yapıları kullanmadan yüksek seviyeli uygulama yazmamıza olanak saglar 

QTConcurrent ile yazılmış uygulamalar uygun olan şekilde core otomatik ayarlanır 


.proya  QT += concurrent eklenir

// main. cpp 

#include <    QCoreApplication             >

#include <    QtConcurrent/QtConcurrent    >

#include <    QThread                      >

#ifndef QT_NO_CONCURRENT

void myRunFunction(QString name)

{

    for(int i=0;i<10 ;i++)

    {

        qDebug()<<  name << " from   "  << QThread::currentThread();

    }

}

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    QFuture<  void  > t1 = QtConcurrent::run(myRunFunction ,QString("A"));

    QFuture<  void  > t2 = QtConcurrent::run(myRunFunction ,QString("B"));

    QFuture<  void  > t3 = QtConcurrent::run(myRunFunction ,QString("C"));

    t1.waitForFinished();

    t2.waitForFinished();

    t3.waitForFinished();

    return a.exec();

}

#else

#include 

int main(int argc, char *argv[])

{

    QApplication app(argc,argv);

    QString text("QtConcurrent is not yet supported on this platform");

    QLabel *label =new QLabel(text);

    qDebug()<
    app.exec();
}
#endif

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arduino ile potansiyometre ve buzzer calıstırma

void setup()
{
  pinMode(A2,INPUT);
  pinMode(A3,OUTPUT);
  Serial.begin(9600);

}

void loop()
{
  int konum=analogRead(A2);
  konum=map(konum,0,1023,0,255);  // 1024 aralıgında ise 0 ,255 aralıgına düşürür
  Serial.println(konum);
  delay(50);
  analogWrite(A3,konum);
}

// BUTTON İLE LED YAKMA


void setup()
{
  pinMode(LED,OUTPUT);
  pinMode(BUTON,INPUT);

}

void loop()
{
  if(digitalRead(BUTON)==HIGH)
  {
    digitalWrite(LED,HIGH);
  }
  else
  {
    digitalWrite(LED,LOW);
  }
}

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Mutex with QT

*mutex kullanımı
//myhtread.h
#ifndef MYTHREAD_H

#define MYTHREAD_H

#include < QtCore >    

class MyThread:public QThread

{

public:

    MyThread();

    void run();

    QString name;

    bool Stop;

};

#endif // MYTHREAD_H

//main.cpp

#include < QCoreApplication >

#include "mythread.h"

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    MyThread m1;

    m1.name="first thread";

    MyThread m2;

    m2.name="second thread";

    MyThread m3;

    m3.name="third thread";

    m1.start(QThread::HighestPriority);

  //  m2.start(QThread::LowestPriority);

  //  m3.start();

    m1.Stop =true;

    return a.exec();

}

// thread.cp
#include "mythread.h"

#include < QtCore >  // UNUTULMAMALI CORE KULLANILACAK 

#include< QDebug >

#include < QThread >

MyThread::MyThread()

{

}

void MyThread::run()

{

    for(int i=0;i<10;i++)

    {

        QMutex mutex;

        if(this->Stop)

        {

            break;

        }

        mutex.unlock();

        this->sleep(1);

        qDebug() << "Runnning"<<name <<"   : "<< i;

    }

}

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Create Threate with QT

*Thread olusturma
1)ilk olarak bir proje olusturulur
2)yeni bir class eklenir
3)yeni olusturulan classa #include   eklenir  ve class ile :public QThread miras alınır 
4)public olarak run() fonksiyonu yaratılır
5)main cpp de ise #include    ve #include "mythread.h" ile class ana uygulamaya eklenir 
6)class source file kısmında(thread.cpp de )  run fonksiyonunda yapılmasını istedigimiz işleri yazarız
void MyThread::run()
{

    for(int i=0;i<10 i="" p="">    {
        qDebug() << "Runnning"<
    }
}
6) istedigimiz kadar threadi artık olusturup start ile baslatırız
    MyThread m1;
    m1.name="first thread";
m1.start();

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HOW TO FFMPEG

*open cmd and go /ffmpeg/bin

1)video information //ffmpeg -i video.mp4

2)convert video //ffmpeg -i video.mp4 video.avi 

3)if you want preserve quality : 

ffmpeg -i video.mp4 -qscale 0 video.avi

4) if you want to see supported formats 
// ffmpeg -formats

5)change resolution // 
ffmpeg -i input.mp4 -s 1280x720 -c:a copy output.mp4

6)compres audio files 
//ffmpeg -i input.mp3 -ab 128 output.mp3

7) Removing audio stream from a media file
ffmpeg -i a.mp4 -an no_voice.mp4

8)Removing from video from media file 
ffmpeg -i a.mp4 -vn no_video.mp4

9)extracting image from video file 
ffmpeg -i a.mp4 -r 1 -f image2 image-%2d.png

10) crop video
ffmpeg -i a.mp4 -croptop 100 -cropbottom 100
 -cropleft 300 -cropright 300 cropvideo.mp4

11)specific crop (minute/second)
ffmpeg -i a.mp4  -t 50 specific_crop.mp4  
(first 50 seconds)

12) set aspect ratio to video
ffmpeg -i a.mp4 -aspect 16:9 aspect.mp4

13)view video 
ffplay a.mp4

14)change speed video 
ffmpeg -i inputvideo.mp4 
-vf "setpts=0.5*PTS" outputvideo.mp4

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