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• "Error opening filters !" when using fluent-ffmpeg with Node

  3 février 2015, par doremi

  I’m trying to get a basic example of html5 video streaming working in an express node app, but I keep running into ffmpeg errors that I’m unsure of how to resolve.

  The input file/stream is the sample.mp4 located here.

  Complete example :

  var ffmpeg = require('fluent-ffmpeg');
  
  var express    = require('express');
  
  var fs         = require('fs');
  
  var sampleApp  = express();
  
  var videoApp   = express();
  
  
  
  var SAMPLE_SERVER_PORT = 3000;
  
  var VIDEO_SERVER_PORT  = 5000;
  
  
  
  sampleApp.get('/:video', function (req, res) {
  
    var videoURL = 'http://localhost:' + VIDEO_SERVER_PORT + '/' + req.params.video;
  
    return res.end('<video controls="controls" src=" + videoURL +"></video>');
  
  });
  
  
  
  videoApp.get('/:video', function(req, res) {
  
  
  
    res.statusCode = 200;
  
    res.setHeader('content-type','video/mp4');
  
  
  
    var stream = fs.createReadStream('./samples/' + req.params.video);
  
  
  
    var proc = ffmpeg(stream)
  
  
  
      .format('mp4')
  
      .size('320x?')
  
      .videoBitrate('512k')
  
      .videoCodec('libx264')
  
      .fps(24)
  
      .audioBitrate('96k')
  
      .audioCodec('aac')
  
      .audioFrequency(22050)
  
      .audioChannels(2)
  
  
  
      .on('error', function(err) {
  
        console.log('an error happened: ' + err.message);
  
      })
  
  
  
      .pipe(res, { end:true });
  
  });
  
  
  
  var server = sampleApp.listen(SAMPLE_SERVER_PORT, function () {
  
    console.log('Example app listening at http://%s:%s', server.address().address, SAMPLE_SERVER_PORT);
  
  });
  
  
  
  
  
  var videoServer = videoApp.listen(VIDEO_SERVER_PORT, function () {
  
    console.log('Video Server listening at http://%s:%s', server.address().address, VIDEO_SERVER_PORT);
  
  });

  The error (via console) :

  an error happened: ffmpeg exited with code 1: Error opening filters!

  ffmpeg configuration :

  ./configure  --prefix=/usr/local --enable-gpl --enable-nonfree --enable-libass \                                                                         
  
  --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus \
  
  --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-libfaac --enable-libfdk-aac

  Any input would be greatly appreciated.

• Setting getChannelData causing socket.io to crash in web audio

  6 novembre 2014, par Brad.Smith

  I’m having an issue where whenever I transcode an audio file and send the audio buffer to the client via socket.io to be played by web audio my connection dies as soon as I perform

  source.buffer.getChannelData(0).set(audio);

  I’m assuming that this isn’t a Socket.IO problem and that I’m only seeing the Socket.IO issue as a result of the real problem. In the client I’m piping the audio file into stdin of ffmpeg and listening to stderr of ffmpeg to determine when it’s safe to send the buffer. The client is receiving the buffer and is doing everything properly until the line stated above. Here is some sample test code to reproduce the issue.

  Server side :

  var express = require('express');
  
  var http = require('http');
  
  var spawn = require('child_process').spawn;
  
  
  
  var app       = express();
  
  var webServer = http.createServer(app);
  
  var io        = require('socket.io').listen(webServer, {log: false});
  
  
  
  app.use(express.static(__dirname + '/public'));
  
  
  
  app.get('/', function(req, res){
  
      res.send(
  
      "<code class="echappe-js">&lt;script src='http://stackoverflow.com/socket.io/socket.io.js'&gt;&lt;/script&gt;
  \n"+
  
      "&lt;script&gt;var socket=io.connect('http://127.0.0.1:3000');&lt;/script&gt;\n"+
  
      "&lt;script src='http://stackoverflow.com/webaudio_file_cli.js'&gt;&lt;/script&gt;"
  
      ) ;
  
  ) ;
  
  webServer.listen(3000) ;
  io.sockets.on(’connection’, function(webSocket) 
  
      var disconnect = ’0’ ;
  
      var count = 0 ;
  
      var audBuf = new Buffer([]) ;
      if (disconnect == ’0’) 
  
          console.log(’new connection...’) ;
  
          var inputStream = spawn(’wget’, [’-O’,’-’,’http://www.noiseaddicts.com/samples/4353.mp3’]) ;
          var ffmpeg = spawn(’ffmpeg’, [
  
              ’-i’, ’pipe:0’, // Input on stdin
  
              ’-acodec’, ’pcm_s16le’, // PCM 16bits, little-endian
  
              ’-ar’, ’24000’, // Sampling rate
  
              ’-ac’, 1, // Mono
  
              ’-f’, ’wav’,
  
              ’pipe:1’ // Output on stdout
  
          ], stdio : [’pipe’,’pipe’,’pipe’]) ;
              inputStream.stdout.pipe(ffmpeg.stdin) ;
              ffmpeg.stdout.on(’data’, function(data) 
  
                  audBuf = Buffer.concat([audBuf,data]) ;
  
              ) ;
              ffmpeg.stderr.on(’data’, function(data) 
  
              var _line = data.toString(’utf8’) ;
  
              if (_line.substring(0,5) == ’size=’ && _line.indexOf(’headers :’) > -1) 
  
                  console.log(’completed...’) ;
  
                  webSocket.emit(’audio’,audBuf) ;
  
              
  
          ) ;
  
      
      webSocket.on(’disconnect’, function() 
  
          console.log(’disconnecting...’) ;
  
              disconnect=1 ;
  
      ) ;
  
  ) ;
  
  
  

  Client side (webaudio_file_cli.js) :

  window.AudioContext = window.AudioContext || window.webkitAudioContext;
  
  var context = new AudioContext();
  
  var source = context.createBufferSource();
  
  
  
  var audioStack = [], audio = [];
  
  
  
  socket.on('audio', function(data) {
  
      playAudio(data);
  
  });
  
  
  
  function playAudio(data) {
  
      // playback starting...
  
      audioStack = Int16Array(data);
  
      for (var i = 0; i < audioStack.length; i++) {
  
          audio[i] = (audioStack[i]>0)?audioStack[i]/32767:audioStack[i]/32768; // convert buffer to within the range -1.0 -> +1.0
  
      }
  
  
  
      var audioBuffer = context.createBuffer(1, audio.length, 24000);
  
      source.buffer.getChannelData(0).set(audio);
  
      source.buffer = audioBuffer;
  
      source.connect(context.destination);
  
      source.start(0);
  
  }

• Laravel FFMPEG, converting large video on smaller EC2 instances

  30 août 2019, par Jeremy Layson

  I’m using ffmpeg on a laravel project (uploaded on AWS Elastic Beanstalk using t3.micro for now). My problem is that my budget can only go for t3.small but sometimes, I’ll have to process large video files like 2GB or even 5GB.

  My current set-up can process smaller files like 30MB and convert them to M3U8 (HLS) so there’s no problem with the set-up. The problem arises when I’m trying to upload and convert a 2GB file as my EC2 instance only has 1GiB of memory.

  Is there a way for FFMPEG (pbmedia/laravel-ffmpeg) to "chunk" the conversion so that it uses less memory ? Doesn’t matter if it takes double the time to convert.