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• 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.

• How to resize yuv420sp using FFmpeg

  27 juin 2012, par newentry

  How to resize yuv420sp data into some other resolution.I tried using ffmpeg sws_scale but no success.I tried by converting yuv420sp to yuv420p and then tried to resize yuv420p into RGB24 via sws_scale but the things it works when both src and destination width and height are same, but for different resolution didn't get correct rgb24. Can anyboody guide me with example code using c or if possible through Java itself .The final resized data must be in yuv420p.
  In my case i am trying to downsize the yuv420sp for eg 640*480 to 320*240 or 176*144.

  thanks,

• how to recompile with -fPIC

  7 juillet 2016, par user1455085

  I was trying to reinstall my ffmpeg, following this guide, on my ARM Ubuntu machine.
  Unfortunatley, when I compile a program which uses this lib I get the following failure :

  /usr/bin/ld: /usr/local/lib/libavcodec.a(amrnbdec.o): relocation R_ARM_MOVW_ABS_NC against `a local symbol' can not be used when making a shared object; recompile with -fPIC
  
  /usr/local/lib/libavcodec.a: could not read symbols: Bad value
  
  collect2: ld returned 1 exit status

  Now I would like to recompile it with -fPIC like the compiler is suggesting but I have no idea how. Any help is appreciated.