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• QtAV render in a widget crashes on application close

  23 novembre 2017, par user3606329

  I compiled FFmpeg statically + QtAV statically and QT statically.

  Once I add the QtAV player in a QWidget it crashes on application close. Did I miss any cleanup procdure ?

  MainWindow::MainWindow(QWidget *parent) :
  
      QMainWindow(parent),
  
      ui(new Ui::MainWindow)
  
  {
  
      ui->setupUi(this);
  
      QtAV::setLogLevel(QtAV::LogAll);
  
  
  
  
  
      AVPlayer *player = new AVPlayer();
  
      WidgetRenderer *renderer = new WidgetRenderer();
  
      renderer->show();
  
      player->addVideoRenderer(renderer);
  
      player->setFile("C:\\abc.mp4");
  
      ui->verticalLayout->addWidget(renderer->widget()); # will cause crash on exit. 
  
      player->play();
  
  
  
  }
  
  
  
  MainWindow::~MainWindow()
  
  {
  
    //  delete player; # I tried this and also the removal of the widget
  
   //   delete renderer; # It still does crash 
  
      delete ui;
  
  }

  The crash comes from

  WidgetRenderer *renderer = new WidgetRenderer();

  Once the renderer is embedded in a QWidget the application can’t exit gracefully somehow.

  I already tried to clean it up, remove the widget, delete the object, etc. but the crash still remains.

  The player works great and plays the videos ! It only gives a crash when the application is closed. (Doesn’t exit gracefully somehow).

  The QtAV log does not print anything about it.

• ffplay lose video stream from rtmp server sent by ffmpeg, only play audio stream

  1er mai 2020, par Константин Тюрин

  I run a stream like this

  



  C :\ffmpeg -rtbufsize 1000000K -re -f dshow -i video="HD Pro Webcam C920" -f dshow -i audio="Микрофон (HD Pro Webcam C920)" -s 320x240 -c:v libx264 -c:a aac -ar 44100 -ac 2 -f flv 
"rtmp ://37.143.12.233:1935/live1/stream"

  



  and play the stream like this

  



  C :\ffplay rtmp ://37.143.12.233:1935/live1/stream

  



  if I start the player first and then stream, then everything is fine, but if the stream first and then the player, then I can only hear the sound, sometimes first running is ok though, but rarely
If I send only video, everything is fine. I tryed to change audio codec settings, ffmpeg and ffplay version but it did not help. Then I tryed other players like VLC media player, and some web player https://hls-js.netlify.app/demo/ . With web player it was better, I did not lose the video, but in 9/10 cases I get eternal loading and need to click apply constantly. What I need to do so as not to lose the video stream in ffplay player and maybe problem in streaming command ? I appretiate any help.

  


• Third party Mediaplayer SDK

  22 avril 2015, par Amanda Fernandez

  I googled a lot and found that there is no way we can alter the buffer size of default media player. So, need to use custom player. I found 2 libraries :

  1. ffmeg
  
  2. gStreamer

  But both are under GNU licence.

  I have confusion on its licence.If I’m using these 2 libraries, then do I have to make my app source code open source.?
  Also, came across brightcove library. It’s native videoplayer NDK. Can It be sued for streaming audio.

  Is there any other 3 party libraries available for media player ?