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• Is it possible to fetch some key-frames of a video by using the HTTP Range header

  9 décembre 2020, par pvd

  I've read the SO problem , and it seems not applying to my specific case.

  


  Is it possible to fetch some key-frames of a video from web server by the HTTP Range header ? For example, for a 30 seconds duration video, we'd like to analysis the I-frame around 00:00:02, 00:00:15, 00:00:28.

  


  I need to analysis the videos from internal web server to detect if there's specific watermarks in it and some other analysis.

  


  Since the first I-frame might be invalid sometimes(Logo for example), we were planning to extract the I-frame from the 00:00:02, the middle I-frame, and the last 2nd second I-frame.

  


  For example, for a 30 seconds duration video, we'd like to analysis the I-frame around 00:00:02, 00:00:15, 00:00:28.

  


  We could make it works while download the whole video, since most of the data we downloaded from the server are not being used. I was wondering if maybe we could only use the HTTP Range header to download partial data and analysis it ?

  


• Get image from webcam, convert that image into something else, and returning it back to the client

  29 janvier 2023, par immigration9

  I have some questions on choosing the right architectural decision to solve my problem.

  


  I am planning to create an app, which takes the

  


  


  1. input from a client's (a browser) webcam,

     


  


  2. sending the input to the server (whether frame by frame, or just live stream video)

     


  


  3. getting each frame from the server (into a image)

     


  


  4. convert the image using some technology (let's say like a tiktok filter)

     


  


  5. returning the image back to the client in real time.

     


  


  


  Except for the phase 4 which the technology can only be applied on an image,
Everything else can be changed.

  


  I'm targeting 30fps (or at least 20) with 1080p quality.

  


  The language or framework is completely agnostic as I do not have any preference. Right now, I am thinking of using React with Node, but I'm opened to other options as well. (eg. Python maybe. Language doesn't matter)

  


  If anyone have some prior experiences, can you teach me the best way ?

  


  I've tried to create the image blob from client and send it to the server using socket.io but it seemed too slow to use when targeted at 30fps on 1080p image.

  


  I'm currently looking at WebRTC with fluent-ffmpeg, but not sure if it's the right way.

  


  Any kind of help will be appreciated.

  


• node js ffmpeg complexfilter overlay another video

  13 octobre 2016, par Handsum

  I have this code planning to output a video containing vid1 and vid2 side by side. So I add a padding to the right of vid1 and tried to use overlay to put vid2 on that space but instead the output video shows a duplicate of vid1 to the right. Can someone please tell me what is wrong with my code and how to fix it ? Thanks

  ffmpeg("vid1.mp4")
  
  .input("vid2.mp4")
  
  .complexFilter([
  
      "scale=300:300[rescaled]",
  
      {
  
          filter:"pad",options:{w:"600",h:"300"},
  
          inputs:"rescaled",outputs:"padded"
  
      },
  
      {
  
          filter:"overlay", options:{x:"300",y:"0"},
  
          inputs:["padded","vid2.mp4"],outputs:"output"
  
      }
  
  ], 'output')
  
  .output("output.mp4")
  
  .on("error",function(er){
  
      console.log("error occured: "+er.message);
  
  })
  
  .on("end",function(){
  
      console.log("success");
  
  })
  
  .run();