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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;

• Node.JS : FFmpeg piped video encoding no thumbnail created

  12 avril 2013, par Sascha Heim

  I want to pipe the video during upload to ffmpeg for realtime thumbnail creation.
  All went fine but no thumbnail.jpg was created and the ffmpeg stderr hangs after the libraries version display.

  Updated : Ive updated my code but it also doesnt create a valid thumbnail.

  var formidable = require('formidable'),
  
          http = require('http'),
  
          sys = require('sys'),
  
          spawn = require('child_process').spawn;
  
  
  
  function spawnFfmpeg(exitCallback) {
  
      var args = ['-i', 'pipe:0', '-c:v', 'mjpeg', '-ss', '00:00:13', '-vframes', '1', '-s', '100x80', 'thumbnail.jpg']
  
      var ffmpeg = spawn('ffmpeg', args);
  
      console.log('Spawning ffmpeg ' + args.join(' '));
  
  
  
      ffmpeg.on('exit', exitCallback);
  
      ffmpeg.stderr.on('data', function(data) {
  
          console.log('grep stderr: ' + data);
  
      });
  
      return ffmpeg;
  
  }
  
  
  
  http.createServer(function(req, res) {
  
      if (req.url == '/' && req.method.toLowerCase() == 'get') {
  
          // show a file upload form
  
          res.writeHead(200, {'content-type': 'text/html'});
  
          res.end
  
                  (&#39;<form action="/upload" enctype="multipart/form-data" method="post">&#39;
  
                          + &#39;<input type="text" /><br />&#39;
  
                          + &#39;<input type="file" multiple="multiple" /><br />&#39;
  
                          + &#39;<input type="submit" value="Upload" />&#39;
  
                          + &#39;</form>&#39;
  
                          );
  
      } else if (req.url == &#39;/upload&#39; &amp;&amp; req.method.toLowerCase() == &#39;post&#39;) {
  
          // parse a file upload
  
          var form = new formidable.IncomingForm();
  
          form.maxFieldsSize = 29 * 1024 * 1024;
  
          // Handle each part of the multi-part post
  
          var ffmpeg = spawnFfmpeg(function(code) {
  
              console.log(&#39;child process exited with code &#39; + code);
  
              res.end();
  
          });
  
  
  
          var form = new formidable.IncomingForm();
  
          // Handle each part of the multi-part post
  
          form.onPart = function(part) {
  
              // Handle each data chunk as data streams in
  
              part.addListener(&#39;data&#39;, function(data) {
  
                  ffmpeg.stdout.pipe(res);
  
                  res.pipe(ffmpeg.stdin);
  
                  // Write each chunk to disk
  
                  //savedFile.write(data);
  
              });
  
          };
  
  
  
          // Do it
  
          form.parse(req);
  
          return;
  
      }
  
  }).listen(80, "127.0.0.1");
  
  
  
  process.on(&#39;uncaughtException&#39;, function(err) {
  
  });

• Libtool library used but `LIBTOOL' is undefined ?

  29 décembre 2014, par Sam Healey

  Im trying to install ffmpeg on my server. Im unsing centos 5.

  When I try to install libfdk_aac I get the following error

  ` autoreconf: Entering directory `.'
  
  autoreconf: configure.ac: not using Gettext
  
  autoreconf: running: aclocal --force -I m4
  
  autoreconf: configure.ac: tracing
  
  autoreconf: configure.ac: not using Libtool
  
  autoreconf: running: /usr/bin/autoconf --force
  
  autoreconf: configure.ac: not using Autoheader
  
  autoreconf: running: automake --add-missing --copy --force-missing
  
  Makefile.am:31: Libtool library used but `LIBTOOL' is undefined
  
  Makefile.am:31:
  
  Makefile.am:31: The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL'
  
  Makefile.am:31: to `configure.ac' and run `aclocal' and `autoconf' again.
  
  Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
  
  autoreconf: automake failed with exit status: 1 ` 

  If i type which libtool I get /usr/bin/libtool, so i think libtool is installed.
  So im not sure why this error is happening.

  Thanks for any advice