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• FFmpeg live streaming webm video to multiple http clients over Nodejs

  11 octobre 2017, par Léo Martin

  I am trying to share a live stream of my screen over an ExpressJS server.
  I cannot save ffmpeg output to a file or start more than one ffmpeg instance for performance reason.
  My current solution is to pipe ffmpeg’s stdout and stream it to each connected client.

  index.js

  const express = require('express');
  
  const app = express();
  
  const request = require('request');
  
  const FFmpeg = require('./FFmpeg');
  
  
  
  const APP_PORT = 3500;
  
  
  
  app.get('/stream', function (req, res) {
  
    const recorder = FFmpeg.getInstance();
  
  
  
    res.writeHead(200, {
  
      "content-type": "video/webm",
  
    });
  
    recorder.stdout.on('data', res.write);
  
    req.on('close', FFmpeg.killInstance);
  
  });
  
  
  
  app.listen(APP_PORT, function () {
  
    console.log(`App is listening on port ${APP_PORT}!`)
  
  });

  FFmpeg.js

  const spawn = require('child_process').spawn;
  
  const ffmpegPath = 'ffmpeg';
  
  const ffmpegOptions = [
  
    '-loglevel', 'panic',
  
    '-y',
  
    '-f',
  
    'alsa',
  
    '-ac',
  
    '2',
  
    '-i',
  
    'pulse',
  
    '-f',
  
    'x11grab',
  
    '-r',
  
    '25',
  
    '-i',
  
    ':0.0+0,0',
  
    '-acodec',
  
    'libvorbis',
  
    '-preset',
  
    'ultrafast',
  
    '-vf',
  
    'scale=320:-1',
  
    "-vcodec", "libvpx-vp9",
  
    '-f', 'webm',
  
    'pipe:1',
  
  ];
  
  
  
  module.exports = {
  
    start,
  
    getInstance,
  
    killInstance,
  
  };
  
  
  
  let instance = null;
  
  let connections = 0;
  
  
  
  function killInstance() {
  
    connections -= 1;
  
    if (connections < 1) {
  
      instance.kill();
  
      instance = null;
  
    }
  
  };
  
  
  
  function getInstance() {
  
    connections += 1;
  
    if (!instance) instance = start();
  
    return instance;
  
  };
  
  
  
  function start() {
  
    return spawn(ffmpegPath, ffmpegOptions);
  
  };

  It is working well for one client, but I cannot manage to stream to several clients at the same time (might be related to missing keyframes).

• Streaming live video from webcam and displaying in VLC

  17 septembre 2017, par Robert

  I have webcam connected to the computer. This camera is detected by ffmpeg.
  This command works correctly :

  ffmpeg -f dshow -i video="Integrated Webcam" out6.mp4

  I can display out6.mp4 file in VLC. But I want to display video in VLC directly from webcam using ffmpeg. So I’ve invoke such a command :

  ffmpeg -f dshow -i video="Integrated Webcam" -preset ultrafast -vcodec libx264 -tune zerolatency -b 900k -f mpegts udp://192.168.0.11:1234/

  and in VLC I enter address udp ://192.168.0.11:1234/ in Open streaming network but the video doesn’t display. I only see traffic bollard.
  In cmd I see that everythink works correctly :

  frame= 1753 fps= 20 q=35.0 size=    7257kB time=00:01:26.63 bitrate= 686.2kbits/
  
  frame= 1766 fps= 20 q=35.0 size=    7305kB time=00:01:27.13 bitrate= 686.8kbits/
  
  frame= 1778 fps= 20 q=35.0 size=    7354kB time=00:01:27.63 bitrate= 687.5kbits/
  
  frame= 1790 fps= 20 q=32.0 size=    7392kB time=00:01:28.13 bitrate= 687.1kbits/
  
  frame= 1793 fps= 20 q=32.0 size=    7402kB time=00:01:28.63 bitrate= 684.2kbits/
  
  frame= 1796 fps= 20 q=33.0 size=    7411kB time=00:01:29.09 bitrate= 681.3kbits/
  
  frame= 1796 fps= 20 q=33.0 Lsize=    7411kB time=00:01:29.09 bitrate= 681.3kbits
  
  /s speed=0.999x

  How can I debug what is wrong ?

• How to setup HLS Live Video Streaming from iOS Device

  9 septembre 2017, par Sean

  Good day everyone !

  So, as the title suggests, i am developing an app with similar functionality to that off Periscope and Facebook Live video streaming. Here is what the end goal is :

  • A Broadcasting device [user]
  • EC2 Instance [Hosting an ffmpeg transcoder]
  • Cloudfront Distrubution [CDN]
  • 1 to n viewers of the live feed

  I’ve been doing a lot of googling and what I cant seem to figure out is :

  As you send chunks of video to the server from the Broadcaster, how do
  you create an
  .m3u8 playlist when you don’t have all the chunks of video yet (e.g. the
  device sends its first 5second chunk of video) ?

  It seems a .m3u8 file is created from a .mp4 file that is already complete, then broken down into chunks... But i’m sending chunks of the video to the server, how can it generate the .m3u8 file when more chunks are still coming from the Broadcaster, so the watchers / clients can continuously stitch together the video chunks ?

  I’ll be happy to clarify this question further. Thanks !