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• WebM on the web

  23 mai 2010, par Basil Gohar — Software, Updates, flumotion, gstreamer, mpeg-la, ogg, vp8, webm, xiph

  News & developments about WebM are coming too fast to cover all of them, but it’s definitely encouraging to see that the free software world (as well as some other surprising, but welcome, players) has unequivocally embraced WebM as the … Read more (...)

• Combine two or more images that partially overlap

  24 décembre 2017, par Smeterlink

  Having two or more images that partially overlap, like in this screenshot, I want to combine/merge them into one :

  

  The coloured squares would be the source images, in lossless format, and no rotation is required.

  The result I want is like using the "Auto-Blend Layers" command from Adobe Photoshop, so auto-align and auto-blend is performed automatically :

  https://helpx.adobe.com/photoshop/using/combine-images-auto-blend-layers.html

• Realtime video conversion using nodejs and ffmpeg

  2 février 2015, par LadislavM

  I’m trying to create very simple server-side video conversion using ffmpeg and nodejs.
  So far, I have 2 UDP servers, one for converting video input and second one for listening for converted video and passing it to websocket.

  I’ve created one UDP server, where stream comes, converts the video input by calling ffmpeg. Then the second UDP server get the converted video and pass it to the websocket server to stream video to browser.

  The problem is probably with input into the ffmpeg. The error I get is

  _stream_readable.js:476
  
    dest.on('unpipe', onunpipe);
  
         ^
  
  TypeError: Object 

  The code looks like this :

  // Websocket Server
  
  var socketServer = new (require('ws').Server)({port: 8081});
  
  socketServer.on('connection', function(socket) {
  
      socket.on('close', function(code, message){
  
          console.log( 'Disconnected WebSocket ('+socketServer.clients.length+' total)' );
  
      });
  
  });
  
  
  
  socketServer.broadcast = function(data, opts) {
  
      for( var i in this.clients ) {
  
          this.clients[i].send(data, opts);
  
      }
  
  };
  
  
  
  // UDP Server
  
  var udpServer = require("dgram").createSocket("udp4");
  
  
  
  udpServer.on("message", function(msg, rinfo) {
  
      socketServer.broadcast(msg, {binary:true});
  
      console.log("server got: " + msg + " from " + rinfo.address + ":" + rinfo.port);
  
  });
  
  
  
  udpServer.on("listening", function() {
  
      var address = udpServer.address();
  
      console.log("server listening " + address.address + ":" + address.port);
  
  });
  
  udpServer.bind(8082);
  
  
  
  // UDP Server for stream conversion
  
  var udpServer2 = require("dgram").createSocket("udp4");
  
  
  
  udpServer2.on("message", function(msg, rinfo) {
  
      // **********  THIS IS WHERE ERROR OCCURS **************
  
      var ffmpeg = require('child_process')
  
              .spawn('ffmpeg',['-f','video4linux2','-i','-','-f','mpeg1video','udp://127.0.0.1:8082']);
  
      ffmpeg.stdin.pipe(msg);
  
  });
  
  
  
  udpServer2.on("listening", function() {
  
      var address = udpServer2.address();
  
      console.log("server listening " + address.address + ":" + address.port);
  
  });
  
  udpServer2.bind(8083);