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• How to extract frames in real time from the MediaStream object returned from the frontend in backend

  23 mai 2023, par Darwin Swartz

  is it possible to extract frames in real-time on the backend from a MediaStream object returned from the frontend ? something like :- instead of extracting frames from a canvas element in frontend and sending those frames to the backend in real time, can we send just the stream instance to the backend and extract frames there in real time until the user stops the recording ?

  


  chrome.tabCapture.capture({ audio: false, video: true }, function(stream) {
  // Use the media stream object here
});


  


  I am using tabCapture api which returns a stream, now I want to send this MediaStream instance in real time to the backend and extract frames there and edit something on them in real-time using OpenCV or FFmpeg. is this something technically possible ?

  


  One approach I have seen is

  


  chrome.tabCapture.capture({ audio: false, video: true }, function(stream) {
  video.srcObject = stream
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
   ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
  const imageData = canvas.toDataURL('image/jpeg');
});


  


  drawing each frame on top of a canvas and capturing those frames from it (in the frontend itself)and sending those frames in real-time to the backend using web sockets. I am not sure about this approach as this might be bad for frontend memory wise,

  


  What could be a more efficient way of implementing real-time frame editing with frame manipulation libraries like OpenCV and FFmpeg

  


• What kind of library can I use to edit video in real time ? [closed]

  14 avril 2020, par DepressingUtopian

  I am developing a video editor on Android (Java). For video encoding, I use a third-party library built on FFMPEG.

  



  https://github.com/tanersener/mobile-ffmpeg

  



  The problem is that everything that happens in FFMPEG is saved to disk ... For example, you cannot apply a filter to real-time video, you have to wait until the result of applying the filter is reset to disk and counted and displayed on VideoView. Tell the library with which you can apply a filter to a piece of video and see it in real time. Or for example, change the contrast of the video and see it on the VideoView.

  



  Perhaps there is a way to redirect the output stream of encoded video using FFMPEG directly to VideoView ?

  


• how can I tell in real time the flow of my IP camera with node JS ?

  15 avril 2022, par C_Bbrahim

  What method should I apply to read in real time the stream of my IP camera using Node Js and the RTSP communication protocol ?

  


  Original Question :
comment je peux dire en temps réel le flux de mon camera IP avec node JS ?
Original text :
(Quel méthode dois je appliquer pour lire en temps réel le flux de mon camera IP en utilisant Node Js et le protocole de communication RTSP ?)