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• 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.

  


• 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.

• Skipping MP4 video

  4 avril 2017, par M.Yazdian

  I like to create the video player to show videos on my website. I made a video player in flash CS5 and actionscript3 to stream the videos on the website.

  My videos are often flv or mp4 format.
  In the flv files I use flvmdi app to inject the metadata to that ,and for skipping the flv file I use xmoov-php (video player can pass the keyframe number from flv metadat to xmoov-php to create the new flv file from passed keyframe to the last flv keyframe, and return the flv video file on the php header for flash video player to show the video ).

  but about mp4 format in Xmoov-php wiki it says :
  this file can’t support the mp4 format to skiping...!!!
  Now I need skiping the mp4 files in my video player (I like my viewers select a part of video before buffering all video on their browser and play it ).

  please give me a suggestion to skipping the mp4 file in the php or .net platform