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• ffmpeg native player started from spring application freezes

  21 mars 2018, par Jemo Mgebrishvili

  I have a spring-mvc project, from browser on button click I’m starting ffmpeg player (ffplay) for video/audio streaming, the problem is that, when player window is opened after the button click, it freezes and not responds, it shows one frame and stops frame updates but has audio voice, also I can’t move it and change player position, if I start the ffplay from cmd (outside from my app) it works fine.
  this is how I am starting the player

  Thread({
  
          val cmd = arrayOf("pathToTheffplay", "-loglevel", "verbose", "rtmp://localhost:portNum/streamName")
  
          val pb = ProcessBuilder(*cmd)
  
          pb.start()
  
          println("player started")
  
    }).start()

  what I am missing ? Any advice ?

• I want to convert relay server nodejs http->websocket code version to java netty to spring-websocket

  20 août 2019, par rura6502

  I want to rewrite this example(https://github.com/phoboslab/jsmpeg/blob/master/websocket-relay.js) to java using netty and spring-WebSocket.

  This nodejs example’s HTTP server get the media data from FFmpeg and relay to the WebSocket. And then javascript library draws on the HTML Canvas.

  But My problem is that when I use netty, spring-WebSocket, some data cannot read by the javascript library and there are many data loss.

  In the example, this nodejs code’s main part I think.

  http = require('http'),
  
  WebSocket = require('ws');
  
  // setting websocket server ..............
  
  var streamServer = http.createServer( function(request, response) {
  
    // ....................
  
      response.connection.setTimeout(0);
  
      request.on('data', function(data){
  
          socketServer.broadcast(data);
  
              // .....
  
      });
  
    // .................
  
  }).listen(STREAM_PORT);

  So I already tried to change this. I just used netty code in the official document(https://netty.io/wiki/user-guide-for-4.x.html) and changed sending a part for the Websocket

  // this code is in channelRead method
  
  ByteBuf buf = (ByteBuf) msg;
  
  try {
  
    while (buf.isReadable()) { // (1)
  
      byte[] bytes = new byte[buf.readableBytes()];
  
      buf.readBytes(bytes);
  
      WSHandler.wsSessions.stream().forEach(wsSession -> {
  
        try {
  
          wsSession.sendMessage(new BinaryMessage(bytes));
  
        } catch (IOException e) {
  
          e.printStackTrace();
  
        };  
  
      });
  
    }
  
  } finally {
  
    ReferenceCountUtil.release(msg); // (2)
  
  }

  Please tell me what I missed. help me. thanks.

• Video created from JPEG images in Spring Boot using FFmpegBuilder is extremely resource demanding

  1er avril 2020, par Igor Avramovic

  I have created small JAVA app which transforms a set of input JPEG images into video

  



  For that purpose i use 
net.bramp.ffmpeg.builder.FFmpegBuilder

  



      FFmpegBuilder builder = new FFmpegBuilder()
                .addInput(imagesSourceFolder)

                .addOutput(videoOutputPath)             
                .setFormat("mp4")
                .setVideoCodec("libx264")
                .setVideoResolution(1280, 720)
                .disableSubtitle() 
                .disableAudio()
                .setVideoFrameRate(FFmpeg.FPS_24)

                .done();



  



  Everything works just fine

  



  But the problem is that video created like this is very resource demanding
For instance, when i play it in VLC it slows my whole system
When i try to stream that video and open it in Browser, 
everything becomes unresponsive,
except for video that keeps running

  



  Any idea why videos created in this way are so resource demanding ?