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• Meteor Spawn_Child_Process for FFMpeg [duplicate]

  2 mars 2013, par user2009114

  Hi I am trying to use Meteor and javascript (Node) to spawn an ffmpeg transcoding event and then stream it live through HTML5 video tags. However, though I can get it working with node.js it seems to hang on the Meteor server and not stream anything though it does seem to be transcoding okay. It appears that the transcoding thread hangs up the server, or is not even a different thread at all ? I am pasting the relevant server side code followed by the client code calling it. One JQuery function calls the transcoding process and the PollForPlaylist is called from the video tags by the hls/. Any help would be much appreciated in solving this. I am wondering if there is a meteor function which I can call to spawn a thread for the ffmpeg function ? Or maybe there is another way to push data to the video tag through jQuery ?

  var spawnNewProcess = function(file, playlistPath) {
  
      var outputUrlPrefix = '/segment/';
  
      var args = ['-i', file, '-async', '1', '-acodec', 'libmp3lame', '-b:a', 128 + 'k', '-vf', 'scale=min(' + targetWidth + '\\, iw):-1', '-b:v', videoBitrate + 'k', '-ar', '44100', '-ac', '2', '-vcodec', 'libx264', '-x264opts', 'level=3.0', '-profile:v', 'baseline', '-preset:v' ,'superfast', '-threads', '0', '-flags', '-global_header', '-map', '0', '-f', 'segment', '-segment_time', '10', '-segment_list', 'stream.m3u8', '-segment_format', 'mpegts', '-segment_list_flags', 'live', 'stream%05d.ts'];
  
  
  
      var encoderChild = childProcess.spawn(transcoderPath, args, {cwd: outputPath});
  
  
  
      console.log(transcoderPath + args);
  
  
  
      encoderProcesses[file] = encoderChild;
  
      currentFile = file;
  
  
  
      console.log('Spawned transcoder instance');
  
  
  
      if (debug) {
  
          encoderChild.stderr.on('data', function(data) {
  
              console.log(data.toString());
  
          });
  
      }
  
  
  
      encoderChild.on('exit', function(code) {
  
          console.log('Transcoder exited with code ' + code);
  
  
  
          delete encoderProcesses[file];
  
      });
  
  
  
      // Kill any "zombie" processes
  
      setTimeout(function() {
  
          if (encoderProcesses[file]) {
  
              console.log('Killing long running process');
  
  
  
              killProcess(encoderProcesses[file]);
  
          }
  
      }, processCleanupTimeout);
  
  };
  
  
  
  var pollForPlaylist = function(file, response) {
  
      var numTries = 0;
  
      console.log("IN POLL FOR PLAYLIST");
  
  
  
      var tryOpenFile = function() {
  
          if (numTries > 20) {
  
              console.log('Gave up trying to open m3u8 file');
  
              response.writeHead(500);
  
              response.end();
  
          }
  
          else {
  
              console.log("IN ELSE");
  
              fs.readFile(playlistPath, function (err, data) {
  
                  console.log("Trying to read file");
  
                  if (err || data.length === 0) {
  
                      numTries++;
  
                      setTimeout(tryOpenFile, 200);
  
                      console.log("ERROR, number of tries", numTries);
  
                  }
  
                  else {
  
                      if (!debug) {
  
                          response.setHeader('Content-Type', 'application/x-mpegURL');
  
                      }
  
                      console.log('response: ' + data);
  
                      response.write(data);
  
                      response.end();
  
                  }
  
              });
  
          }
  
      };
  
          console.log("Try open");
  
          tryOpenFile();
  
  };
  
  
  
  var killProcess = function(processToKill, callback) {
  
      processToKill.kill();
  
  
  
      setTimeout(function() {
  
          processToKill.kill('SIGKILL');
  
      }, 5000);
  
  
  
      processToKill.on('exit', function(code) {
  
          if (callback) callback();
  
      });
  
  }
  
  
  
  var handlePlaylistRequest = function(file, request, response) {
  
      if (!file) {
  
          request.writeHead(400);
  
          request.end();
  
      }
  
  
  
      if (lock) {
  
          console.log('Ongoing spawn process not finished, denying request');
  
          response.writeHead(503);
  
          response.end();
  
          return;
  
      }
  
  
  
      file = path.join('/', file); // Remove ".." etc
  
      file = path.join(rootPath, file);
  
  
  
      console.log("PLAYLIST PATH", playlistPath);
  
      if (currentFile != file) {
  
          lock = true;
  
  
  
          console.log('New file to encode chosen');
  
  
  
          // Make sure old one gets killed
  
          if (encoderProcesses[currentFile]) {
  
              killProcess(encoderProcesses[currentFile], function() {
  
                  fs.unlink(playlistPath, function (err) {
  
                      spawnNewProcess(file, playlistPath, outputPath);
  
                      lock = false;
  
                  });
  
              });
  
          }
  
          else {
  
              fs.unlink(playlistPath, function (err) {
  
                  spawnNewProcess(file, playlistPath, outputPath);
  
                  lock = false;
  
              });
  
          }
  
          currentFile = file;
  
      }
  
  };

  The Client side code which calls this is :

  var videoNode = document.querySelector('video');
  
  $.get('hls/?file='+file);
  
  videoNode.src = "hls/" + file;

• Save Gstreamer stream at Windows side [closed]

  18 février 2013, par user1336117

  I am streaming video from webcam from linux via gstreamer as below :

  gst-launch -v v4l2src device=/dev/video0 ! videorate  ! video/x-raw-yuv, width=320, height=240, framerate=5/1  ! videobalance saturation=0.0 ! jpegenc ! multipartmux ! tcpserversink host=192.168.10.24 port=5000

  I can see the stream via VLC

  tcp://192.168.10.67:5000

  As the next step I want to save it as a video file but I could not succeeded.
  I tried to setup gstreamer to windows but it did not worked.
  I tried to save the stream by using ffmpeg on windows side but it did not worked.

  ffmpeg -i tcp://192.168.10.67:5000 -map 0 deneme.flv

  What should I do to be able to save the stream on windows side ?

• What kind of stream GStreamer produce ?

  16 novembre 2014, par Max

  I use following 2 commands to stream video from Raspberry Pi

  RaPi

  raspivid -t 999999 -h 720 -w 1080 -fps 25 -hf -b 2000000 -o - | gst-launch-1.0 -v fdsrc ! h264parse !  rtph264pay config-interval=1 pt=96 ! gdppay ! tcpserversink host=$RA-IP-ADDR port=5000 

  Linux Box

  gst-launch-1.0 -v tcpclientsrc host=$RA-IP-ADDR port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false 

  But what kind of stream is it ? Can I read it with OpenCV ? or convert with avconv|ffmpeg nc $RA-IP-ADDR 5000 | avconv ? or watch with VLC ?