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• webcam displyed on LAN not to the internet

  9 juin 2015, par Francois Baret

  OK, this is not due to a dumb mistake : I have forwarded the port and there is no firewall in between.
  I try to make the "live streaming" section of jsmpeg (https://github.com/phoboslab/jsmpeg) to work on the Internet. To get the webcam stream on my webpage I modify "stream-server.js"

  if( process.argv.length < 3 ) {
  
          console.log(
  
                  'Usage: \n' +
  
                  'node stream-server.js <secret> [ ]'
  
          );
  
          process.exit();
  
  }
  
  
  
  var STREAM_SECRET = process.argv[2],
  
          STREAM_PORT = process.argv[3] || 8082,
  
          WEBSOCKET_PORT = process.argv[4] || 8084,
  
          STREAM_MAGIC_BYTES = 'jsmp'; // Must be 4 bytes
  
  
  
  var width = 320,
  
          height = 240;
  
  
  
  // Websocket Server
  
  var socketServer = new (require('ws').Server)({port: WEBSOCKET_PORT});
  
  socketServer.on('connection', function(socket) {
  
          // Send magic bytes and video size to the newly connected socket
  
          // struct { char magic[4]; unsigned short width, height;}
  
          var streamHeader = new Buffer(8);
  
          streamHeader.write(STREAM_MAGIC_BYTES);
  
          streamHeader.writeUInt16BE(width, 4);
  
          streamHeader.writeUInt16BE(height, 6);
  
          socket.send(streamHeader, {binary:true});
  
  
  
          console.log( 'New WebSocket Connection ('+socketServer.clients.length+' total)' );
  
          
  
          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 ) {
  
                  if (this.clients[i].readyState == 1) {
  
                          this.clients[i].send(data, opts);
  
                  }
  
                  else {
  
                          console.log( 'Error: Client ('+i+') not connected.' );
  
                  }
  
          }
  
  };
  
  
  
  
  
  // HTTP Server to accept incomming MPEG Stream
  
  var streamServer = require('http').createServer( function(request, response) {
  
          var params = request.url.substr(1).split('/');
  
  
  
          if( params[0] == STREAM_SECRET ) {
  
                  width = (params[1] || 320)|0;
  
                  height = (params[2] || 240)|0;
  
                  
  
                  console.log(
  
                          'Stream Connected: ' + request.socket.remoteAddress + 
  
                          ':' + request.socket.remotePort + ' size: ' + width + 'x' + height
  
                  );
  
                  request.on('data', function(data){
  
                          socketServer.broadcast(data, {binary:true});
  
                  });
  
          }
  
          else {
  
                  console.log(
  
                          'Failed Stream Connection: '+ request.socket.remoteAddress + 
  
                          request.socket.remotePort + ' - wrong secret.'
  
                  );
  
                  response.end();
  
          }
  
  }).listen(STREAM_PORT);
  
  
  
  console.log('Listening for MPEG Stream on http://127.0.0.1:'+STREAM_PORT+'/<secret>/<width>/<height>');
  
  console.log('Awaiting WebSocket connections on ws://127.0.0.1:'+WEBSOCKET_PORT+'/');
  
  
  
  var servi = require('servi'),                // include the servi library
  
          app = new servi(false);                // servi instance
  
  
  
  // configure the server's behavior:
  
  app.port(8080);                                                // port number to run the server on
  
  app.serveFiles("public");                        // serve all static HTML files from /public
  
  app.start();        
  
  console.log("Listening for new clients on port 8080");</height></width></secret></secret>

          
  
          
  
          
  
  
  
  
  
  <h1>
  
   The Canvas size specified 
  
  </h1>
  
          
  
          <canvas width="640" height="480">
  
                  <p>
  
                          Please use a browser that supports the Canvas Element, like
  
                          <a href="http://www.google.com/chrome">Chrome</a>,
  
                          <a href="http://www.mozilla.com/firefox/">Firefox</a>,
  
                          <a href="http://www.apple.com/safari/">Safari</a> or Internet Explorer 10
  
                  </p>
  
          </canvas>
  
          <code class="echappe-js">&lt;script type=&quot;text/javascript&quot; src=&quot;http://stackoverflow.com/feeds/tag/jsmpg.js&quot;&gt;&lt;/script&gt;
  	
  &lt;script type=&quot;text/javascript&quot;&gt;<br />
  
                  // Show loading notice<br />
  
                  var canvas = document.getElementById('videoCanvas');<br />
  
                  var ctx = canvas.getContext('2d');<br />
  
                  ctx.fillStyle = '#444';<br />
  
                  ctx.fillText('Loading...', canvas.width/2-30, canvas.height/3);<br />
  
  <br />
  
                  // Setup the WebSocket connection and start the player<br />
  
                  var client = new WebSocket( 'ws://192.168.1.15:8084/' );<br />
  
                  var player = new jsmpeg(client, {canvas:canvas});<br />
  
          &lt;/script&gt;
  

  The "index.html" is included in a "public" folder.

  Then I start ffmpeg with :

  `ffmpeg -s 640x480 -f video4linux2 -i /dev/video0 -f mpeg1video -b:v 800k -r 30 http://192.168.1.15:8082/1693/640/480/`

  When I open, on any station of the lan, url 192.168.1.x:8080 I get the webcam streaming on my page "jsmpeg streaming webcam" ; but if use the public ip 41.142.x.y:8080 from outside the local network (using 3G) I get the page (with the h1 line "The Canvas size specified") but no video it just says in the frame "loading".
  I do not understand why it works locally and not globally. Why the page is streaming on the internet but not the webcam ?
  Thanks for your help !

• How to utilize hardware decode for audio ?

  20 mars 2014, par jAckOdE

  I have a buffer that contain packets read by ffmpeg from a video file encoded using H264/AAC
  According to Apple document, audio stream encoded in AAC can be decode with hardware support,

  how to decode the audio stream with hardware support ?

  UPDATE : I use Audio Queue Service to output the audio. Right now i decode AAC packet using ffmpeg and send LPCM audio to AQS. According to the Apple document, I can send directly AAC audio to AQ and it will take care of decoding task. Does it decode with hardware ? Do i need, and how to set Audio Queue's parameter to enable audio hardware decoding ?

• avfilter/drawtext : fix box sizing

  10 juillet 2018, par Gyan Doshi

  avfilter/drawtext : fix box sizing
  At present, box size is clipped to frame size before being drawn,
  
  which can lead to the box not fully covering animated text which is
  
  longer than one or both frame dimensions.
  Since ff_blend_rectangle correctly takes care of clipping, it is skipped
  
  here which results in correct box sizing
  

  • [DH] libavfilter/vf_drawtext.c