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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 ?

  


• FFmpeg : How to convert vertical/horizontal video (any size) with black sides, to 1080x1350 vertical video with blurred background sides/bottom-top

  12 octobre 2023, par devweb

  i've been trying to make a ffmpeg 'filter_complex' code to make what i need but i can't, i've used some codes here on stack but non works for what i need, each is like for a different size/dimension.
I'm trying to make videos like Instagram posts (tallest allowed) : 1080 x 1350

  


  Bassically, horizontal videos with blurred sides or bottom-top.

  


  Any help will be awesome, thanks !

  


  This is the principal which i tried

  


  Something like this :

  


  Example 1
Example 2

  


  Here some codes i tried to worked with and changing stuff :
filter_complex='[0:v]scale=1080*2:1350*2,boxblur=luma_radius=min(h\\,w)/20:luma_power=1:chroma_radius=min(cw\\,ch)/20:chroma_power=1[bg];[0:v]scale=-1:1080[ov];[bg][ov]overlay=(W-w)/2:(H-h)/2,crop=w=1080:h=1350'

  


  filter_complex='[0:v]scale=ih*5/4:-1,crop=h=iw*4/5,gblur=sigma=20[blurred];[blurred][0:v]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2'

  


  filter_complex='[0:v]scale=1080:1350,setsar=1,gblur=sigma=20[blurred];[blurred][0:v]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2'

  


• How to add text to video frame/s using ffmpeg ?

  17 février 2017, par Pappu

  What I need is that I am looking for command that helps me add a text on video for few frames. For example, there is door with a empty name plate in a scene. I should be able to write name to it and it should move as the door moves. after door disappears, so should the text. Can I do it using ffmpeg or any other tool in linux. TIA