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• (Ffmpeg) How to play live audio in the browser from received UDP packets using Ffmpeg ?

  26 octobre 2022, par Yousef Alaqra

  I have .NET Core console application which acts as UDP Server and UDP Client

  



  

  • UDP client by receiving audio packet.

  


  • UDP server, by sending each received packet.

  


  



  Here's a sample code of the console app :

  



  static UdpClient udpListener = new UdpClient();
    static IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("192.168.1.230"), 6980);
    static IAudioSender audioSender = new UdpAudioSender(new IPEndPoint(IPAddress.Parse("192.168.1.230"), 65535));

    static void Main(string[] args)
    {
        udpListener.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
        udpListener.Client.Bind(endPoint);

        try
        {
            udpListener.BeginReceive(new AsyncCallback(recv), null);
        }
        catch (Exception e)
        {
            throw e;
        }

        Console.WriteLine("Press enter to dispose the running service");
        Console.ReadLine();
    }

    private async static void recv(IAsyncResult res)
    {
        byte[] received = udpListener.EndReceive(res, ref endPoint);
        OnAudioCaptured(received);
        udpListener.BeginReceive(new AsyncCallback(recv), null);
    }


  



  On the other side, I have a node js API application, which supposes to execute an FFmpeg command as a child process and to do the following

  



  

  • receive the audio packet as an input from the console app UDP server.

  


  • convert the received bytes into WebM

  


  • pipe out the result into the response.

  


  



  Finally, in the client-side, I should have an audio element with source value equals to the http://localhost:3000

  



  For now, I can only execute this FFmpeg command :

  



  ffmpeg -f  s16le  -ar 48000 -ac 2 -i 'udp://192.168.1.230:65535' output.wav


  



  Which do the following

  



  

  • Receive UDP packet as an input

  


  • Convert the received bytes into the output.wav audio file.

  


  



  How would I execute a child process in the node js server which receives the UDP packets and pipe out the result into the response as Webm ?

  


• How to check when ffmpeg completes a task ?

  25 mai 2018, par Andrew

  I’m just learning how to use ffmpeg a few hours ago to generate video thumbnails.

  These are some results :

  

  

  I’d used the same size (width - height) to Youtube’s. Each image contains max 25 thumbnails (5x5) with the size 160x90.

  Everything looks good until :

  public async Task GetVideoThumbnailsAsync(string videoPath, string videoId)
  
  {
  
      byte thumbnailWidth = 160;
  
      byte thumbnailHeight = 90;
  
  
  
      string fps = "1/2";
  
  
  
      videoPath = Path.Combine(_environment.WebRootPath, videoPath);
  
  
  
      string videoThumbnailsPath = Path.Combine(_environment.WebRootPath, $"assets/images/video_thumbnails/{videoId}");
  
      string outputImagePath = Path.Combine(videoThumbnailsPath, "item_%d.jpg");
  
  
  
      Directory.CreateDirectory(videoThumbnailsPath);
  
  
  
      using (var ffmpeg = new Process())
  
      {
  
          ffmpeg.StartInfo.Arguments = $" -i {videoPath} -vf fps={fps} -s {thumbnailWidth}x{thumbnailHeight} {outputImagePath}";
  
          ffmpeg.StartInfo.FileName = Path.Combine(_environment.ContentRootPath, "FFmpeg/ffmpeg.exe");
  
          ffmpeg.Start();
  
      }
  
  
  
      await Task.Delay(3000);
  
  
  
      await GenerateThumbnailsAsync(videoThumbnailsPath, videoId);
  
  }

  I’m getting a trouble with the line :

  await Task.Delay(3000);

  When I learn the way to use ffmpeg, they didn’t mention about it. After some hours failed, I notice that :

  An mp4 video (1 min 31 sec - 1.93Mb) requires some delay time 1000ms. And other, an mp4 video (1 min 49 sec - 7.25Mb) requires some delay time 3000ms.

  If I don’t use Task.Delay and try to get all the files immediately, it would return 0 (there was no file in the directory).

  Plus, each file which has a difference length to the others requires a difference delay time. I don’t know how to calculate it.

  And my question is : How to check when the task has completed ?

  P/s : I don’t mean to relate to javascript, but in js, there is something called Promise :

  var promise = new Promise(function (done) {
  
      var todo = function () {
  
          done();
  
      };
  
  
  
      todo();
  
  });
  
  
  
  promise.then(function () {
  
      console.log('DONE...');
  
  });

  I want to edit the code like that.

  Thank you !

• ffmpeg add loop to this line of code i have

  5 juin 2020, par steve

  the code itself is working fine however the 2.mp3 finishes instead i will like it to just loop all the way keeping the current settings how it is as I am happy with it

  



  ffmpeg -i "C:\Users\test\Desktop\vidz\New folder (2)\target\vaastav song .mp4" -i "C:\Users\test\Desktop\vidz\New folder (2)\target\2.mp3" -filter_complex "[1:a]adelay=3000|60000[1a];[0:a][1a]amix" -vcodec copy -y "C:\Users\test\Desktop\vidz\New folder (2)\target\output1.mp4"