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• How do I broadcast live audio in Node.js ?

  20 juin 2020, par Yousef Alaqra

  I'm trying stream live audio to a wide range of clients in a web browser.

  



  My current solution :

  



  Dotnet core 3.1 console application

  



  

  1. receive the audio data over UDP

  


  2. trimming the first 28 bytes of each received packet

  


  3. and send the processed packet over UDP.

  


  



  Node JS

  



  

  1. execute a Ffmepg as a child process to receive audio data packets
over UDP from the console app, and encode each packet to audio WAV
format

  


  2. Pipe out the result of the child process into a GET HTTP endpoint response

  


  



  Browser

  



  

  1. HTML audio element with source value equals to the node js GET
endpoint

  


  



  Problem :

  



  The solution is giving a good result, but only for one device(one to one), which is not what I want to achieve.

  



  I've tried many solutions to make it applicable to a wide range of devices, such as using working threads and forking a child process, but none of them changes the result.

  



  I believe that I've to make some changes to the node js implementation, so here I'll share it with you, hoping to get a clue to solve the problem.

  



  var express = require("express");
var app = express();
var children = require("child_process");

var port = 5001;
var host = "192.168.1.230";

app.listen(port, host, () => {
  console.log("Server running at http://" + host + ":" + port + "/");
});

app.get('/stream', (req, res) => {
  const ffmpegCommand = "ffmpeg";
  var ffmpegOptions =
    "-f s16le -ar 48000 -ac 2 -i udp://192.168.1.230:65535 -f wav -";

  var ffm = children.spawn(ffmpegCommand, ffmpegOptions.split(" "));

  res.writeHead(200, { "Content-Type": "audio/wav; codecs=PCM" });
  ffm.stdout.pipe(res);
});


  



  If someone interested to see the full implementation, please let me know.

  


• How to broadcast live audio in node js (1 to many)

  19 juin 2020, par Yousef Alaqra

  I'm trying stream live audio to a wide range of clients in a web browser.

  



  My current solution :

  



  Dotnet core 3.1 console application

  



  

  1. receive the audio data over UDP

  


  2. trimming the first 28 bytes of each received packet

  


  3. and send the processed packet over UDP.

  


  



  Node JS

  



  

  1. execute a Ffmepg as a child process to receive audio data packets
over UDP from the console app, and encode each packet to audio WAV
format

  


  2. Pipe out the result of the child process into a GET HTTP endpoint response

  


  



  Browser

  



  

  1. HTML audio element with source value equals to the node js GET
endpoint

  


  



  Problem :

  



  The solution is giving a good result, but only for one device(one to one), which is not what I want to achieve.

  



  I've tried many solutions to make it applicable to a wide range of devices, such as using working threads and forking a child process, but none of them changes the result.

  



  I believe that I've to make some changes to the node js implementation, so here I'll share it with you, hoping to get a clue to solve the problem.

  



  var express = require("express");
var app = express();
var children = require("child_process");

var port = 5001;
var host = "192.168.1.230";

app.listen(port, host, () => {
  console.log("Server running at http://" + host + ":" + port + "/");
});

app.get('/stream', (req, res) => {
  const ffmpegCommand = "ffmpeg";
  var ffmpegOptions =
    "-f s16le -ar 48000 -ac 2 -i udp://192.168.1.230:65535 -f wav -";

  var ffm = children.spawn(ffmpegCommand, ffmpegOptions.split(" "));

  res.writeHead(200, { "Content-Type": "audio/wav; codecs=PCM" });
  ffm.stdout.pipe(res);
});


  



  If someone interested to see the full implementation, please let me know.

  


• get specific metadata with ffprobe

  1er mai, par mikem

  I'm having a terrible time getting one single line of metadata from ffprobe.

  


  I'm running this command :

  


  


  ffprobe -show_entries 'stream_tags :
format_tags=com.apple.quicktime.creationdate' -loglevel error
IMG_9931.MOV

  


  


  And I get this output

  


  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Video

  


  TAG:encoder=H.264

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Audio

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Metadata

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Metadata

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Metadata

  


  [/STREAM]

  


  [FORMAT]

  


  TAG:com.apple.quicktime.creationdate=2022-05-14T16:24:55-0400

  


  [/FORMAT]

  


  


  But the only thing I want returned is

  


  


  com.apple.quicktime.creationdate=2022-05-14T16:24:55-0400

  


  


  I've searched and searched but I can't find any examples of pulling a single specific value of metadata.

  


  In actuality, I really just want the value of com.apple.quicktime.creationdate... ie "2022-05-14T16:24:55-0400"

  


  I know I can grep and awk my way through it, but it seems like there should be a way to do it with ffprobe alone given all of the options it has. I just can't figure out how.

  


  How can I do this ? Any help would be appreciated.