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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 ?

• Evolution #2173 (Résolu) : Date de création / publication

  13 janvier 2018, par nico d_

  J’ai ajouté la doc du plugin : https://contrib.spip.net/ecrire/?exec=article&id_article=4967

  Pas encore publiée, mais je propose de fermer ce ticket dès qu’elle le sera, et de continuer la discussion sur le forum du plugin sur contrib.

• How to stream the desktop using FFMPEG , and set the output to http://127.0.0.1:8080

  26 décembre 2023, par Yamine Klioui

  i am trying to use FFMPEG on windows to stream my entire desktop, through my localhost address : 127.0.0.1:8080 , and it will be accessible from another computer in the same network , using vlc by opening network url, or embed it in a source video file for exemple.
i tried the commande here :

  


  ffmpeg -f gdigrab -framerate 6 -i desktop output.mp4  


  


  but this record the entire desktop (what i want to do) and store it in ouput.mp4 file , i tried changing it to :

  


      ffmpeg -f gdigrab -framerate 6 -i desktop http://127.0.0.1:8080


  


  but i get this error :

  


  [gdigrab @ 0000023b7ee4e540] Capturing whole desktop as 1920x1080x32 at (0,0)
[gdigrab @ 0000023b7ee4e540] Stream #0 : not enough frames to estimate rate ; consider increasing probesize
Input #0, gdigrab, from 'desktop' :
Duration : N/A, start : 1625841636.774340, bitrate : 398133 kb/s
Stream #0:0 : Video : bmp, bgra, 1920x1080, 398133 kb/s, 6 fps, 1000k tbr, 1000k tbn
[NULL @ 0000023b7ee506c0] Unable to find a suitable output format for 'http://127.0.0.1:8080'
http://127.0.0.1:8080 : Invalid argument

  


  but i want to set the output as : http://127.0.0.1:8080
how should i do that ?

  


  Update :
I found this command :

  


  ffmpeg -f gdigrab -framerate 30 -i desktop -vcodec mpeg4 -q 12 -f mpegts http://127.0.0.1:8080

  


  it seems to stream, but i am not able to open it from nor vlc nor media player