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• Using ffmpeg with an audio input from System.IO.Stream

  17 juillet 2020, par kevingoos

  So I am creating a project where I need to convert audio comming from azure text to speech.
  
I wanted to use ffmpeg for this, but I am not an expert with all these parameters.
So far I alread got it working where I read from a $.wav file and convert it to an output System.IO.Stream comming from ffmpeg.

  


  But I want to change it that I don't always save a wav file to disk. Instead now I get a System.IO.Stream from azure text to speech, but I have no clue for the params and the documentation is not really clear for me...

  


  var azureAudio = await new AzureSpeechService().Speak(text);

var psi = new ProcessStartInfo
{
    FileName = @"C:\ffmpeg-20200715-a54b367-win64-static\bin\ffmpeg.exe",
    Arguments = "-i pipe:0 -ac 2 -f s16le -ar 48000 pipe:1",
    RedirectStandardOutput = true,
    UseShellExecute = false
};
var ffmpeg = Process.Start(psi);

var inputStream = ffmpeg.StandardInput.BaseStream;

azureAudio.CopyTo(inputStream);

inputStream.Flush();
inputStream.Close();

var outputStream = ffmpeg.StandardOutput.BaseStream;
await SendAudioAsync(client, outputStream);


  


• Assign output of subprocess to variable

  21 juillet 2016, par Bryan

  The purpose of this script is to read a file, extract the audio, and print out a transcript by running it through IBM Watson speech to text API. My problem is when I try to save the output from the subprocess into a variable and pass it into the open function, it reads as binary. What am I doing wrong ? Any help would be appreciated !

  import sys
  
  import re 
  
  import json
  
  import requests
  
  import subprocess 
  
  from subprocess import Popen, PIPE
  
  
  
  fullVideo = sys.argv[1]
  
  title = re.findall('^([^.]*).*', fullVideo)
  
  title = str(title[0])
  
  output = subprocess.Popen('ffmpeg -i ' + fullVideo + ' -vn -ab 128k ' + title + '.flac', shell = True, stdin=subprocess.PIPE).communicate()[0]
  
  
  
  sfile= open(output, "rb")
  
  response = requests.post("https://stream.watsonplatform.net/speech-to-text/api/v1/recognize",
  
           auth=("USERNAME", "PASSWORD"),
  
           headers = {"content-type": "audio/flac"},
  
           data=sfile
  
           )
  
  
  
  print (json.loads(response.text))

• NodeJS SpeechRecorder pipe to child process ffmpeg encoder - dest.on is not a function

  10 décembre 2022, par Matthew Swaringen

  Trying to make a utility to help me with recording words for something. Unfortunately getting stuck on the basics.

  


  The error I get when I hit s key and talk enough to fill the buffer is

  


  terminate called after throwing an instance of 'Napi::Error'
  what():  dest.on is not a function
[1]    2298218 IOT instruction (core dumped)  node record.js


  


  Code is below. I can write the wav file and then encode that but I'd rather not have to have an intermediate file unless there is no way around it, and I can't imagine that is the case.

  


  const { spawn } = require('child_process');
const { writeFileSync } = require('fs');
const readline = require('readline');
const { SpeechRecorder } = require('speech-recorder');
const { WaveFile } = require('wavefile');

let paused = true;

const ffmpeg = spawn('ffmpeg', [
 // '-f', 's16', // input format
  //'-sample_rate', '16000',
  '-i', '-', // input source
  '-c:a', 'libvorbis', // audio codec  
  'output.ogg', // output file  
  '-y'
]);

let buffer = [];
const recorder = new SpeechRecorder({
  onAudio: ({ audio, speech }) => {
    //if(speech) {

      for (let i = 0; i < audio.length; i++) {
        buffer.push(audio[i]);
      }

      if(buffer.length >= 16000 * 5) { 
        console.log('piping to ffmpeg for output');
        let wav = new WaveFile()
        wav.fromScratch(1,16000,"16",buffer);
        //writeFileSync('output.wav',wav.toBuffer());
        ffmpeg.stdin.pipe(buffer, {end: false});
      }
    //}
  }
});

// listen for keypress events
readline.emitKeypressEvents(process.stdin);
process.stdin.setRawMode(true);

process.stdin.on('keypress', (str, key) => {
  if (key.name === 's') {
    // pause or resume recording
    paused = !paused;
    if(paused) { recorder.stop(); } else { recorder.start(); }

   
  } else if (key.ctrl && key.name === 'c') {
    // exit program
    ffmpeg.kill('SIGINT');    
    process.exit();
  }
});