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• FFMPEG stream .mpg to windows pipe and display video in C#

  25 septembre 2018, par Przemysław

  i’ve got problem with streaming mpg video to windows pipe. I wang decode video with command ffmpeg.exe to windows pipe and connect to that pipe with c# and display video on winform. I’ve tried many commands but none of them worked.

  FFmpeg command :

  ffmpeg -i Day Flight.mpg -f image2pipe pipe:1 > //./pipe/ffpipe

  C# code :

  using System;
  
  using System.Drawing;
  
  using System.Windows.Forms;
  
  using System.IO;
  
  using System.IO.Pipes;
  
  using System.Threading;
  
  using System.Runtime.InteropServices;
  
  using System.Text;
  
  
  
  namespace WindowsFormsApplication1
  
  {
  
  
  
  public partial class Form1 : Form
  
  {
  
  
  
      String readLine_;
  
      private void readThread()
  
      {
  
  
  
          while (true)
  
          {
  
              readLine_ = reader_.ReadLine();
  
              if (readLine_ != null)
  
              {
  
  
  
                  byte[] bytes = Encoding.Unicode.GetBytes(readLine_);
  
                  //Console.WriteLine(readLine_);
  
                  //Console.ReadLine();
  
                  var ms = new MemoryStream(bytes);
  
                  // Bitmap bm = new Bitmap(ms);
  
                  Image im = (Bitmap)((new ImageConverter()).ConvertFrom(bytes));
  
              }
  
              else
  
                  Console.WriteLine("empty string");
  
  
  
              //
  
  
  
  
  
  
  
          }
  
      }
  
      private NamedPipeServerStream server_;
  
      StreamReader reader_;
  
  
  
  
  
      public Form1()
  
      {
  
          InitializeComponent();
  
      }
  
  
  
      private void Form1_Load(object sender, EventArgs e)
  
      {
  
          AllocConsole();
  
          server_ = new NamedPipeServerStream("ffpipe", PipeDirection.In, 1, PipeTransmissionMode.Byte);
  
          server_.WaitForConnection();
  
          reader_ = new StreamReader(server_);
  
          Thread t = new Thread(readThread);
  
          t.Start();
  
  
  
  
  
      }
  
  
  
  
  
      [DllImport("kernel32.dll", SetLastError = true)]
  
      [return: MarshalAs(UnmanagedType.Bool)]
  
      static extern bool AllocConsole();
  
  }

  }

  I can’t get image in C#, my program crashes in line
  Image im = (Bitmap)((new ImageConverter()).ConvertFrom(bytes)) ;

  And I don’t know where I make a mistake - in ffmpeg piping or in C# program
  https://image.ibb.co/eGDymp/Przechwytywanie.png
  https://image.ibb.co/hWpM6p/Przechwytywanie.png

  Example video :
  http://samples.ffmpeg.org/MPEG2/mpegts-klv/Day%20Flight.mpg

• How to remove noise from audio .wav file in python3 like Audacity app works [on hold]

  9 février 2019, par Manohar Sonwan

  I have been working on an audio file to remove noise by using python3, I have tried "ffmpeg" (highpass and lowpass) filter option but I am not getting the correct result which I want. Then I found Audacity application which noise reduction technique is very good and it gives very good clear sound. Please suggest me any effective library in python3

  Consider I have been recording a tennis player and I want to listen collision sound of tennis racquet and the ball only but there is also some other noise like people, bird, car etc.

  ffmpeg -i  IMG_2016_FFMPEG.WAV -af "highpass =f=800,lowpass =f=100"
  
  IMG_2016_FFMPEG_lp_100_hp_800.wav

  It not giving output as Audacity application

• How to insert an image in between a video ?

  10 février 2019, par robinson george

  I want to make an android app in which user can insert a images in a video. I tried drawing video over the photo(selected by user) with replacing green colour in video using ffmpeg library. But the results are not very satisfying and it’s take around 4-5 seconds to encode a video of around 15 seconds. There are already many apps present in play store but i was wondering how they achieved this effect in so much lesser time(like < 1 sec to encode 15 sec video).
  For reference - https://play.google.com/store/apps/details?id=com.yy.biu
  https://play.google.com/store/apps/details?id=com.newbiz.mvmaster

  You can have a look at the result output file here- http://www.yourfilelink.com/get.php?fid=1881360