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• Recording a website with PhantomJS and FFMpeg ?

  18 novembre 2016, par Rjaibi Mejdi

  I want to record a website using Phantomjs and use pipeline and FFMpeg to create a live video (Server or Stream URL)

  runner.js code :

  var page = require('webpage').create();
  
  page.viewportSize = { width: 640, height: 480 };
  
  
  
  page.open('http://www.goodboydigital.com/pixijs/examples/12-2/', function () {
  
    setInterval(function() {
  
      page.render('/dev/stdout', { format: "png" });
  
    }, 25);
  
  });

  Commande Line :

  $ phantomjs runner.js | ffmpeg -y -c:v png -f image2pipe -r 24 -i - -c:v libx264 -pix_fmt yuv420p -threads 10 -movflags +faststart -b:v 3500k -bufsize 1024k -f flv "rtmp://rtmp-api.facebook.com:80/rtmp/1734882043502131?ds=1&s_l=1&a=AaYJ7cQfH719X5Kl"

  The problem is that I get this error when I want to start a live stream in facebook :
   In the preview mode is working
  
   When I start the Live I got this message
  

• adaptive bitrate, Is it better to reduce the resolution of a video or just reduce it's bitrate ?

  29 janvier 2018, par loki

  I must provide my videos in adaptive bitrate (HLS). To do this I need to provide several videos at different bitrate. Using ffmpeg :

  1. I can make several variants of the video at the same resolution but at different bitrate.
  2. I can make several variants of the video at different resolutions resulting in different bitrate.

  So what is the way to go ? What settings does other services like youtube/instagram/facebook use ?

• Live video broadcasting in android using front and back facing cameras [on hold]

  1er décembre 2016, par Jun Kim

  This is my first time I am posting a question on Stack Overflow.

  I am currently developing an android application. My goal is to make an app that captures and records video and broadcasts it to other mobile devices as well as web browsers like facebook live.
  (Nowadays, famous apps like Youtube, Facebook, Twitch, Periscope has this function)

  Now, I am just researching what technologies and ways to develop this app.

  I have been researching and reading a lot of blogs and documentations for the past five weeks about FFMpeg, different types of streaming technologies, types of web servers etc. I decided to use MPEG-DASH for my app and nginx server (Nginx-rtmp-module).

  While searching further, I got stuck and confused about how I can possibly capture & record video using internal camera of Android mobile devices.

  I was thinking that I could use MediaRecorder to capture & record (I could hardly find an example using MediaRecorder to record video) and use FFMpeg
  to somehow encode with the certain video and audio codecs to make a container format and send it to nginx server to broadcast other devices.
  But then.... i am not sure if this is the right way to do it...

  My questions is... I would like to know the whole process (in detail if it possible) how I can possible record and broadcast to other devices.

  The whole process of recording video using internal camera that is in user’s mobile device and send the frame to the server to broadcast to other devices seems difficult to imagine for me... Can anyone elaborate ?

  Or any suggestion about how can I reach my goal ?
  Every help would be appreciated.