im doing a simple application that plays a video from an sql database from my computer..

HEADER
Qt Code: 
  1. #include <QMainWindow>
  2. #include <QtCore>
  3. #include <QtGui>
  4.  
  5. #include <phonon/MediaObject>
  6. #include <phonon/AudioOutput>
  7. #include <phonon/VideoWidget>
  8.  
  9. #include <QtSql>
  10.  
  11. namespace Ui {
  12.     class SQLtest;
  13. }
  14.  
  15. class SQLtest : public QMainWindow
  16. {
  17.     Q_OBJECT
  18.  
  19. public:
  20.     explicit SQLtest(QWidget *parent = 0);
  22.     ~SQLtest();
  23.  
  24. public slots:
  25.     void _DoParse();
  26.  
  27. private:
  28.     Ui::SQLtest *ui;
  29.     Phonon::MediaObject *mediaObject;
  30.     Phonon::AudioOutput *aio_audioOutput;
  31.     Phonon::VideoWidget *wid_videowidget;
  32. };
  33.  
  34. #endif // SQLTEST_H
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CPP FILE

Qt Code: 
  1. #include "sqltest.h"
  2. #include "ui_sqltest.h"
  3.  
  4. SQLtest::SQLtest(QWidget *parent) :
  5.     QMainWindow(parent),
  6.     ui(new Ui::SQLtest)
  7. {
  8.     ui->setupUi(this);
  9.  
  10.     QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL", "maindb");
  11.     db.setHostName("localhost");
  12.     db.setDatabaseName("data");
  13.     db.setUserName("root");
  14.     db.setPassword("MYPASS");
  15.  
  16.     QTimer::singleShot(0, this, SLOT(_DoParse()));
  17.  
  18.  
  19.     mediaObject = new Phonon::MediaObject(this);
  20.     metaInformationResolver = new Phonon::MediaObject(this);
  21.     wid_videowidget = new Phonon::VideoWidget(this);
  22.     aio_audioOutput = new Phonon::AudioOutput(Phonon::VideoCategory, this);
  23.  
  24.     // Make our Connections
  25.     Phonon::createPath(mediaObject, wid_videowidget); // to link the mediaobject withvideo widget
  26.     Phonon::createPath(mediaObject, aio_audioOutput); // to link the mediaobject with audo output
  27.     // Add our display settings
  28.     wid_videowidget->setGeometry(0, 0, 760, 360);
  29.     wid_videowidget->setAspectRatio(Phonon::VideoWidget::AspectRatioWidget);
  30.     wid_videowidget->setScaleMode(Phonon::VideoWidget::FitInView);
  31.     aio_audioOutput->setVolume(50);
  32.  
  33. }
  34.  
  35. void SQLtest::_DoParse()
  36. {
  37.     QSqlDatabase db = QSqlDatabase::database("maindb");
  38.     QSqlQuery query(db);
  39.  
  40.     if(db.open()){
  41.  
  42.            query.exec("SELECT `Movie` FROM `strings` WHERE Movie IS NOT NULL LIMIT 0 , 30");
  43.  
  44.            while (query.next()){
  45.                QString movie = query.value(0).toString();
  46.  
  47.                QString vidpath = QApplication::applicationDirPath();
  48.                vidpath = "/home/dev/ttm/moives/" + movie;
  49.                mediaObject->enqueue(Phonon::MediaSource(vidpath));
  50.  
  51.                mediaObject->play();
  52.  
  53. //               QMessageBox::critical(this,
  54. //                                     "String for Movie",
  55. //                                     movie,
  56. //                                     QMessageBox::Ok);
  57.  
  58.            }
  59.  
  60.  
  61.     }else if(!db.open()){
  62.         QMessageBox::critical(this,
  63.                               "DB NOT OPEN",
  64.                               "NOT Open",
  66.     }
  67. }
  68.  
  69. SQLtest::~SQLtest()
  70. {
  71.     delete ui;
  72. }
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error i get when first file is done playing

SQLtest(15297): couldn't create slave: "Unable to create io-slave:
klauncher said: Unknown protocol ''.
"