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• 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);

• FFmpeg synthesizes multiple videos, the final result is only sound, no picture display

  6 juillet 2023, par Halifax

  1、I first converted mp4 to ts：

  


  -i MyVideo.mp4 -vcodec copy -acodec aac -b:v 10000k MyVideo.ts


  


  2、Then scale the ts and fill the empty space：

  


  -i MyVideo.ts -vf pad=width=iw:height=ih:x=-1:y=0:color='White' -b:v 10000k MyVideo_transform.ts


  


  3、Finally use concat to merge into mp4 files：

  


  -i "concat:MyVideo_transform1.ts|MyVideo_transform2.ts" -acodec copy -vcodec copy -absf aac_adtstoasc -b:v 10000k $outputFilePath"


  


  Finally use concat to merge into mp4 files。

  


  I hope that the final merged result can see the video picture。

  


• avconv : split printing the final statistics into a separate function

  17 mars 2014, par Anton Khirnov

  avconv : split printing the final statistics into a separate function
  

  • [DBH] avconv.c