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• Why is the audio recording on Chrome missing duration

  16 août 2019, par Ivan Sedelkin

  I’m sending some user created audio to a server which later passes it to googles speech to text api for transcription. Everything works perfectly on firefox but when I try it on Chrome it doesn’t work. I then installed FFmpeg to check if the metadata somehow changed for the file on chrome and noticed that the duration on the file is tagged "N/A". This does not happen on firefox.

  This is the audio recorded from Chrome

  Input #0, matroska,webm, from 'PATH_TO_FILE':
  
    Metadata:
  
      encoder         : Chrome
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)

  This is the audio recorded from Firefox

  Input #0, ogg, from 'PATH_TO_FILE':
  
    Duration: 00:00:01.26, start: 0.000000, bitrate: 53 kb/s
  
      Stream #0:0: Audio: opus, 48000 Hz, mono, fltp
  
      Metadata:
  
        ENCODER         : Mozilla68.0

  The audio itself is recorded using the mediarecorder-api where the blob is later converted to base64-url and sent to my server.

  This is the code that I use to record the audio :

  navigator.mediaDevices
  
      .getUserMedia(
  
        // constraints - only audio needed for this app
  
        {
  
          audio: true
  
        }
  
      )
  
  
  
      // Success callback
  
      .then(function(stream) {
  
        console.log(navigator.mediaDevices.getSupportedConstraints());
  
        var mediaRecorder = new MediaRecorder(stream, { sampleRate: 44100 });
  
        var chunks = [];
  
        $(".rec-button")
  
          .mousedown(function() {
  
            console.log("rec start");
  
            $(".rec-button i").addClass("recStart");
  
            mediaRecorder.start();
  
            console.log(mediaRecorder.state);
  
            console.log("recorder started");
  
          })
  
          .mouseup(function() {
  
            console.log("rec end");
  
            $(".rec-button i").removeClass("recStart");
  
            mediaRecorder.stop();
  
            mediaRecorder.ondataavailable = function(e) {
  
              chunks.push(e.data);
  
              var blob = new Blob(chunks, { type: "audio/ogg; codecs=opus" });
  
              var player = document.getElementById("player");
  
              player.src = URL.createObjectURL(blob);
  
              chunks = [];
  
              var reader = new window.FileReader();
  
              reader.readAsDataURL(blob);
  
              reader.onloadend = function() {
  
                var base64 = reader.result;
  
                var audioArr = {
  
                  audio: base64
  
                };
  
                $.ajax({
  
                  url: "http://localhost:4242/api/1.0/post",
  
                  type: "POST",
  
                  contentType: "application/json",
  
                  dataType: "json",
  
                  data: JSON.stringify(audioArr),
  
                  success: function(response) {
  
                    console.log(response);
  
                  },
  
                  error: function(err) {
  
                    console.log(err);
  
                  }
  
                });
  
              };
  
              console.log(mediaRecorder.state);
  
              console.log("recorder stopped");
  
            };
  
          });
  
      })
  
  
  
      // Error callback
  
      .catch(function(err) {
  
        console.log("The following getUserMedia error occured: " + err);
  
      });

  My goal is that the audio file recorded from chrome has a duration so that the google api can transcribe it. If you guys have any way of overcoming this problem I would be grateful

• HTTP Live video streaming using ffmpeg using NODEJS via Socket.IO

  4 avril 2024, par dintel

  I can't transmit the webcam to the server and to the website. Before, I was able to transmit the webcam (I don't remember how), but I only see frames continuously sent in cmd and don't see anything at localhost:3000 or 127.0.0.1:3000.
I installed socket.io, ffmpeg and nodejs path
And when i try this one, everything fine on udp, but to server and website is impossible.
ffplay udp ://127.0.0.1:23000
ffmpeg -f dshow -framerate 30 -video_size 640x480 -i video="Integrated Camera" -vcodec mpeg4 -f mpegts udp ://127.0.0.1:23000

  


  My server.js code :

  


  
const http = require('http');
const fs = require('fs');
const server = http.createServer((req, res) => {
  res.writeHead(200, {'Content-Type': 'text/html'});
  fs.readFile(__dirname + '/index.html', (err, data) => {
    if (err) {
      res.writeHead(404);
      res.end(JSON.stringify(err));
      return;
    }
    res.writeHead(200);
    res.end(data);
  });
});
const io = require('socket.io')(server);

io.on('connection', (socket) => {
  console.log('A user connected');

  socket.on('disconnect', () => {
    console.log('User disconnected');
  });
});

server.listen(3000, () => {
  console.log('Server is running on http://localhost:3000');
});

const spawn = require('child_process').spawn;

const ffmpeg = spawn('ffmpeg', [
  '-f', 'dshow',
  '-i', 'video="Integrated Camera"', // i'm sure this is my webcam window
  '-vcodec', 'libx264',
  '-preset', 'veryfast',
  '-tune', 'zerolatency',
  '-f', 'hls',
  '-hls_time', '2',
  '-hls_list_size', '6',
  '-hls_flags', 'delete_segments',
  '-hls_segment_filename', 'public/hls/stream%03d.ts',
  'public/hls/index.m3u8'
]);

ffmpeg.stderr.on('data', (data) => {
  console.error(`ffmpeg error: ${data}`);
});
`


  


  My index.html :

  


  &#xA;&#xA;&#xA;  &#xA;  &#xA;  &#xA;&#xA;&#xA;  <video width="640" height="480" controls="controls"></video>&#xA;  <code class="echappe-js">&lt;script src='http://stackoverflow.com/socket.io/socket.io.js'&gt;&lt;/script&gt;&#xA;  &lt;script&gt;&amp;#xA;    const socket = io();&amp;#xA;&amp;#xA;    const video = document.getElementById(&amp;#x27;videoPlayer&amp;#x27;);&amp;#xA;    const stream = new MediaStream();&amp;#xA;&amp;#xA;    video.srcObject = stream;&amp;#xA;    video.play();&amp;#xA;&amp;#xA;    socket.on(&amp;#x27;stream&amp;#x27;, (data) =&gt; {&amp;#xA;      const byteArray = new Uint8Array(data);&amp;#xA;      const blob = new Blob([byteArray], { type: &amp;#x27;video/mp4&amp;#x27; });&amp;#xA;      const url = window.URL.createObjectURL(blob);&amp;#xA;&amp;#xA;      const reader = new FileReader();&amp;#xA;      reader.readAsDataURL(blob);&amp;#xA;      reader.onloadend = () =&gt; {&amp;#xA;        video.src = reader.result;&amp;#xA;      };&amp;#xA;    });&amp;#xA;  &lt;/script&gt;&#xA;&#xA;&#xA;`&#xA; `&#xA;

  


• Raspberry Pi : Playing multiple video files in mkfifo pipe

  19 janvier 2017, par user3246167

  I have 2 files, test.mp4 and test2.mp4 that I want to play concurrently with no noticeable break in the middle. Currently I’m using

  mkfifo test
  
  cat test.mp4 > test &
  
  cat test2.mp4 > test &
  
  omxplayer test

  However, when I do this, omxplayer just returns data and doesn’t play the file. But if I just put a single file into the pipe, omxplayer shows it normally. I’ve also tried using the copy command in ffmpeg, and that also just returns data, doesn’t play the file.

  I understand that I can just concatenate the 2 files together, but that will not work for my purposes, because I will need to be able to feed files to the pipe while omxplayer is running