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Thread: Phonon performance slow down

  1. #1
    Join Date
    Mar 2013
    Posts
    24
    Qt products
    Qt4 Qt/Embedded
    Platforms
    Unix/X11

    Default Phonon performance slow down

    Hi,

    i've a problem using the phonon video player. I play a video on loop, but after some hours the application slow down. The memory usage is stable.

    I use it in that way:
    Qt Code:
    1. guiMain::guiMain(QWidget *parent) :
    2. QWidget(parent),
    3. ui(new Ui::guiMain)
    4. {
    5. ...
    6.  
    7. //video
    8. video=0;
    9. QString videoFileName;
    10. videoFileName.append(conf::Instance()->systemVideoPath);
    11. videoFileName.append(conf::Instance()->adsVideoFileName);
    12. QFile videoFile(videoFileName);
    13. videoRestartTime=new QTimer(this);
    14. if (videoFile.exists()){
    15. ui->videoPlayer->show();
    16. video = new Phonon::MediaSource(videoFileName);
    17. ui->videoPlayer->play(*video);
    18. connect(ui->videoPlayer->mediaObject(),SIGNAL(finished()), this,SLOT(videoRestart()));
    19. pictureEnable=false;
    20. videoEnable=true;
    21. }else{
    22. ui->videoPlayer->hide();
    23. ui->lblAds->show();
    24. pictureEnable=true;
    25. videoEnable=false;
    26. video=0;
    27. }
    28. }
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    Qt Code:
    1. void guiMain::videoRestart(){
    2. if(videoEnable){
    3. if (video!=0){
    4. ui->videoPlayer->stop();
    5. ui->videoPlayer->load(*video);
    6. ui->videoPlayer->play();
    7. }else
    8. pErrorMng->alarmPush(302,warning,tr("Main Gui"), tr("Ads video not found"));
    9. }
    10. }
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    the ui->videoPlayer is a Phonon::videoPlayer

    What is wrong?

    Thanks

  2. #2
    Join Date
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    Qt products
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    Wiki edits
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    Default Re: Phonon performance slow down

    When are you deleting the video object?
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  3. #3
    Join Date
    Mar 2013
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    Qt products
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    Platforms
    Unix/X11

    Default Re: Phonon performance slow down

    Never, I create it at the constructor and destroy at the exit.

    I pass always the same object to the videoPlayer, do I have to create and destroy the mediaObject and the videoPlayer every time?

    The strange thing is that the memory occupancy doesn't increase and if I disable the video(stop and clear) the application return back to the same performance.

  4. #4
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    Default Re: Phonon performance slow down

    Well... first of all you can create that object as a member variable so that you don't have to dereference it everytime you have to pass it to Phonon. Not that it is going to make your code significantly faster but then you didn't show us anything that could help pinpoint the problem so that's the only comment I can give looking at the code you posted.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  5. #5
    Join Date
    Mar 2013
    Posts
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    Qt products
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    Platforms
    Unix/X11

    Default Re: Phonon performance slow down

    thanks you for your help.

    I post all the class about the video so you can have a look:

    guiMain.h
    Qt Code:
    1. class guiMain : public QWidget
    2. {
    3. Q_OBJECT
    4.  
    5. public:
    6. explicit guiMain(QWidget *parent = 0);
    7. ~guiMain();
    8. ...
    9.  
    10. public slots:
    11.  
    12.  
    13. private slots:
    14.  
    15. ...
    16.  
    17. void updateAds();
    18. void videoRestart();
    19. void videoAutoRestart();
    20.  
    21. signals:
    22.  
    23. private:
    24.  
    25. ...
    26. //video
    27. Phonon::MediaSource video;
    28. QTimer * videoRestartTime;
    29. void startVideo();
    30. void stopVideo();
    31.  
    32. };
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    guiMain.cpp
    Qt Code:
    1. guiMain::guiMain(QWidget *parent) :
    2. QWidget(parent),
    3. ui(new Ui::guiMain)
    4. {
    5. ui->setupUi(this);
    6.  
    7. ...
    8. //video
    9. QString videoFileName;
    10. videoFileName.append(conf::Instance()->systemVideoPath);
    11. videoFileName.append(conf::Instance()->adsVideoFileName);
    12. QFile videoFile(videoFileName);
    13. videoRestartTime=new QTimer(this);
    14. if (videoFile.exists()){
    15. ui->videoPlayer->show();
    16. video=Phonon::MediaSource (videoFileName);
    17. ui->videoPlayer->load(video);
    18. ui->videoPlayer->play();
    19. connect(ui->videoPlayer->mediaObject(),SIGNAL(aboutToFinish()), this,SLOT(videoAutoRestart()));
    20. pictureEnable=false;
    21. videoEnable=true;
    22. }else{
    23. ui->videoPlayer->hide();
    24. ui->lblAds->show();
    25. pictureEnable=true;
    26. videoEnable=false;
    27. }
    28. ...
    29. }
    30.  
    31. void guiMain::videoRestart(){
    32. if(videoEnable && ui->stackedWidget->currentIndex()==nav["pMain"]){
    33. ui->lblAds->hide();
    34. ui->videoPlayer->show();
    35. ui->videoPlayer->load(video);
    36. ui->videoPlayer->play();
    37. }
    38. }
    39.  
    40. void guiMain::videoAutoRestart(){
    41. ui->videoPlayer->mediaObject()->enqueue(video);
    42. ui->videoPlayer->play();
    43. }
    44.  
    45. void guiMain::stopVideo(){
    46. ui->videoPlayer->mediaObject()->clearQueue();
    47. ui->videoPlayer->mediaObject()->clear();
    48. ui->videoPlayer->stop();
    49. }
    To copy to clipboard, switch view to plain text mode 

    The videoRestart is called when I get back to the main screen, the stopVideo is called when i get out of it.
    The videoAutoRestart is a slot connected to the aboutToFinish signal

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