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• EmguCV capture rtsp ip camera stream ffmpeg

  2 février 2018, par Mr Neo

  I am working with IP camera and EmguCV to detect person in an area.
  Everything is work normally with Highgui capture source.
  But with Arlo camera which use FFMPEG format, I am unable to get stream without any exception.
  Here is the code I have tried :

  if (capture == null)
  
          {
  
              try
  
              {
  
                  capture = new Capture("rtsp://<ip>:8554/live"); 
  
                  capture.ImageGrabbed += Capture_ImageGrabbed;
  
                  capture.Grab();
  
                  capture.Start();
  
              }
  
  
  
  
  
              catch (NullReferenceException exception)
  
              {
  
                  MessageBox.Show(exception.Message);
  
              }
  
              catch (TypeInitializationException exc)
  
              {
  
                  MessageBox.Show(
  
                     "Attention: You have to copy all the assemblies and native libraries from an official release of EmguCV to the directory of the demo." +
  
                     Environment.NewLine + Environment.NewLine + exc);
  
              }
  
  }
  
  </ip>

  and here is Capture_ImageGrabbed event which is not fired.

  private void Capture_ImageGrabbed(object sender, EventArgs e)
  
      {
  
          Mat image = new Mat();
  
          capture.Retrieve(image);
  
          picCAM.Image = image.Bitmap;
  
      }

  Thanks so much for your help !

• SharedArrayBuffer for ffmpeg not working with React-Native

  31 août 2022, par Peter Garcia

  I am currently working on a React Native App using ffmpeg.wasm

  


  but for some reason, SharedArrayBuffer is still not working. My React version is "react" : "17.0.2", and React-dom is "17.0.2",. My Chrome version is Version 104.0.5112.101 (Official Build) (arm64)

  


  I've been racking my brain about why this isn't working on my React Native app since I did a test app and it works there but on this app, it doesn't.

  


  I am getting this error whenever I run ffmpeg.wasm :

  


  Uncaught (in promise) ReferenceError: SharedArrayBuffer is not defined
at aa35944d-451a-411f-bf18-4e42f7bbceb0:22:175
at Object.load (createFFmpeg.js:64:1)


  


  I cannot use Cross-Origin Opener headers :

  


  Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp


  


  because our app calls from a lot of outside APIs and it breaks them.

  


  Any help would be greatly appreciated.

  


• How to fix this FFMPEG command to record audio as well ?

  19 mai 2018, par James Kowalski

  I am trying to fix this FFMPEG command to record audio.

  I have tried using the parts recommended on the official stackoverflow site but they didn’t work

  Orignal Command

  ffmpeg_stream = '/usr/bin/ffmpeg -f x11grab -s 1280x720 -r 24 -i :%d+nomouse -c:v libx264 -preset superfast -pix_fmt yuv420p -s 1280x720 -threads 0 -f flv "%s"' % (xvfb.new_display, info['destination'])

  Command with attempted audio

  ffmpeg_stream = '/usr/bin/ffmpeg -f x11grab -s 1280x720 -r 24 -i :%d+nomouse -c:v libx264 -preset superfast -pix_fmt yuv420p -s 1280x720 -threads 0 -f alsa -ac 2 -i hw:0 -f flv "%s"' % (xvfb.new_display, info['destination'])