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• Clips from a Live Video

  12 mai 2022, par Jorge Borreguero Sanmartin

  I am doing a program in Python that gets clips from a live video. To do so, with opencv I get the currrrent_frame_position and with the fps I get the start and final time to run this command :

  


  ffmpeg -i live_video.ts -ss 00:01:30 -to 00:02:00 -c:v copy output.ts

  


  To improve, I want to start dumping the live_video on the new file once I know the starting time, and finish once I get the final time. My intention is to make this process faster and get the result file sooner. It is not necessary to use ffmpeg but it is the tool that I have been using. How can I do this ?

  


• ffmpeg merge video and audio + fade out

  1er mai 2016, par jacky brown

  I have one video file and one audio file.
  I want to merge them together that the final output video will be in the length of the video and will contain the audio in the background.

  i did :

  ffmpeg -i output.avi -i bgmusic.mp3 -filter_complex " [1:0] apad " -shortest out.avi

  but the background audio is cut in the end of the final merge movie.
  i want it to fade out nicely.

  how can i do it ??

  but the background audio is cut in the end of the final merge movie.
  i want it to fade out nicely.

  how can i do it ??

  thanks.

• 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 !