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• ffmpeg low fps and high latency

  1er août 2018, par chrifdexter97

  i want to broadcast my webcam using ffmpeg to an rtmp nodejs server. i had a couple of issues : the fps is locked between 8-15 frame/s plus a high latency while playing the stream using ffplay.
  this is the server code :

   const { NodeMediaServer } = require('node-media-server');
  
  
  
   const config = {
  
   rtmp: {
  
   port: 1935,
  
   chunk_size: 60000,
  
   gop_cache: true,
  
   ping: 60,
  
   ping_timeout: 30
  
   },
  
   http: {
  
   port: 8000,
  
   allow_origin: '*'
  
   }
  
   };
  
  
  
   var nms = new NodeMediaServer(config)
  
   nms.run();

  the command line to start the webcam broadcast :

   ffmpeg -re -i /dev/video0 -c:v libx264 -preset superfast -tune zerolatency -f flv rtmp://localhost/live/STREAM_NAME

  the command line on the receiver end :

    ffplay http://localhost:8000/live/STREAM_NAME.flv

  the server process uses 0.7 % cpu and 2.8 % mem
  ffmpeg process uses 10-11 % cpu and 3.4 % mem

• How to read raw audio data using FFmpeg ?

  6 juin 2020, par Yousef Alaqra

  I'm trying to use this command to get the audio stream using UDP :

  



  ffmpeg -i udp://192.168.1.1:6980 -acodec copy


  



  I got an error when I execute it, which says :

  



  [udp @ 00000157a76b9a40] bind failed: Error number -10048 occurred
udp://192.168.1.1:6980: I/O error


  



  What's the meaning of this error ?

  



  Update :

  



  I was able to read raw audio data using FFmpeg and output into a wave file, using the following command :

  



  ffmpeg -f u16be -ar 44100 -ac 2 -i 'udp://127.0.0.1:1223' output.wav


  



  The problem now, Sine there is surrounding metadata in the network packets being received, it needs to be stripped out or it will result in noise.

  



  In C# I used Skip() to trim the first 28 bytes of the received packet, how would I achieve this using FFmpeg ?

  



  Update :

  



  I was able to read the raw bytes from UDP packets using by executing child process in node js :

  



  var http = require("http");
var port = 8888;
var host = "localhost";
var children = require("child_process");

http
  .createServer(function (req, res) {
    //ffmpeg -f s16le -ar 48000 -ac 2 -i 'udp://192.168.1.230:65535' -b:a 128k -f webm -
    var ffm = children.spawn(
      "ffmpeg",
      "-f s16le -ar 48000 -ac 2 -i udp://192.168.1.230:65535 -b:a 128k -f webm -".split(
        " "
      )
    );

    res.writeHead(200, { "Content-Type": "audio/webm" });
    ffm.stdout.on("data", (data) => {
      console.log(data);
      res.write(data);
    });
  })
  .listen(port, host);

console.log("Server running at http://" + host + ":" + port + "/");


  



  As you can see in the code sample above, I'm trying to pipe the output of the child process into the response, so I would be able to hear the audio in the browser.

  



  I'm receiving the data, after executing the child process, but the browser unable to play audio for some reason that I need to figure it out.

  



  Do you have an idea of what am I missing ?

  


• Macports, ffpmeg, mpv on High Sierra [on hold]

  21 novembre 2017, par chris

  Has anyone seen this error on macports ?

  I’ve already installed Xcode and agreed license.

  Checked the logs and appears there’s an issue with audiotoolbox :

  :info:configure ERROR: audiotoolbox requested but not found

  Best, Chris

  Chris-MacBookAir:apps chrisbridges$ sudo port install mpv
  
  Password:
  
  --->  Computing dependencies for mpv
  
  The following dependencies will be installed: 
  
   ffmpeg
  
   libcddb
  
   libcdio
  
   libcdio-paranoia
  
   libdvdcss
  
   libdvdnav
  
   libdvdread
  
   lua52
  
   popt
  
   rubberband
  
   youtube-dl
  
  Continue? [Y/n]: Y
  
  --->  Configuring ffmpeg
  
  Error: Failed to configure ffmpeg: configure failure: command execution failed
  
  Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_multimedia_ffmpeg/ffmpeg/main.log for details.
  
  Error: Follow https://guide.macports.org/#project.tickets to report a bug.
  
  Error: Processing of port mpv failed
  
  Chris-MacBookAir:apps chrisbridges$