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• Streaming Video from RTMP to EMGUCV

  22 juillet 2017, par Isuru

  I’m trying to stream a webcam using RTMP to an EMGUCV project in order to process the video. I have set up a private RTMP server in a linux box using this tutorial,
  https://obsproject.com/forum/resources/how-to-set-up-your-own-private-rtmp-server-using-nginx.50/

  I’m testing the webcam stream using ffmpeg with the following commands,

  • Write to the rtmp server using,

    ffmpeg -y -f vfwcap -framerate 25 -video_size 640x480 -i 0 -an -f flv rtmp://rtmp-server:1935/live/stream

  • Read from the rtmp server using,
    ffplay -fflags nobuffer rtmp ://rtmp-server:1935/live/stream -loglevel verbose

  I’m able to write a simple OpenCV C++ application to read the stream and display it. Code below,

      cv::VideoCapture vcap;
  
      cv::Mat image;
  
      const std::string videoStreamAddress = "rtmp://rtmp-server:1935/live/stream";
  
      if(!vcap.open(videoStreamAddress)) {
  
          printf("Error opening video stream or file");
  
          return -1;
  
      }
  
  
  
      cv::namedWindow("Output Window");
  
      cv::Mat edges;
  
      for(;;) {
  
          if(!vcap.read(image)) {
  
              printf("No frame");
  
              cv::waitKey();
  
          }
  
          cv::imshow("Output Window", image);
  
          if(cv::waitKey(1) >= 0) break;
  
      }
  
  return 0;

  The above code works properly. However when I try it using EMGUCV C#, I get the error message
  unable to create to capture from rtmp://rtmp-server:1935/live/stream

  This is my C# Code,

      public partial class MainForm : Form
  
      {
  
          private static Capture _cameraCapture;
  
  
  
          public MainForm()
  
          {
  
              InitializeComponent();
  
              Run();
  
          }
  
  
  
          void Run()
  
          {
  
              try
  
              {
  
                  _cameraCapture = new Capture("rtmp://192.168.56.101:1935/live/stream");                
  
              }
  
              catch (Exception e)
  
              {
  
                  MessageBox.Show(e.Message);
  
                  return;
  
              }            
  
          }
  
     }

  Do I need a specific build of EMGUCV with FFMPEG or is RTMP capturing not available in EMGUCV ?

• Can't run exec('ffmpeg') ; ffmpeg, wamp & windows 2008 server

  15 mars 2015, par Nicholas Walker

  i’ve installed FFMPEG on my windows server. If i go to cmd and type ffmpeg -version i get the version, available commands etc. I use WAMP server with php 5.4.12

  The reason i am not using ffmpeg-php is because i have installed it with no errors and i cant use the extension for php even tho it says it is installed.

  When i try to do

  <?php
  
  echo exec('ffmpeg -version'); 
  
  ?>

  its totally blank, no errors or nothing.

  If i run

  <?php
  
  echo exec('whoami'); 
  
  ?>

  i get : nt authority\system

  So i can run exec in my php.

  I’ve also tried the same with shell_exec() ; ffmpeg not working with either of them.

  After looking at other stackoverflow questions i’ve seen people fixing this problem by allowing IIS user to use ffmpeg.exe. But i am using Wamp so i don’t know what to do.

  Any ideas ?

• use AForge.video.FFMPEG in c# 2008

  23 décembre 2013, par user2922938

  i work in visual studio 2008 in c# language, when run the program the error :

  $exception "Could not load file or assembly 'AForge.Video.FFMPEG,
  Version=2.2.5.0,

  Culture=neutral, PublicKeyToken=03563089b1be05dd' or one of its
  dependencies. An attempt

  was made to load a program with an incorrect format."

  using System;
  
  using System.Collections.Generic;
  
  using System.ComponentModel;
  
  using System.Data;
  
  using System.Drawing;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Windows.Forms;
  
  using AForge.Video.FFMPEG;
  
  
  
  
  
  namespace WindowsFormsApplication9
  
  {
  
  
  
  public partial class Form1 : Form
  
  {
  
  
  
      public Form1()
  
      {
  
          InitializeComponent();
  
      }
  
  
  
  
  
      private void button1_Click(object sender, EventArgs e)
  
      {
  
          VideoFileReader video = new VideoFileReader();
  
      }
  
  
  
  
  
  }

  what is wrong in program ??