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• Separating webserver and processing server

  6 mars 2020, par John Doe

  I would like an architecture design advice.

  I have a projet composed of a public Node.JS API server (handling client HTTP browser requests)

  The purpose of my project is to convert an image to a video (I do this using ffmpeg as CLI and it can take some time)

  The business workflow should be the the following :

  1) A user sends an image URL and his email (as POST parameters) to the API

  2) The API should responds "OK 200" and send later an email containing a video of the image

  Here is my idea (and what my current program does) :

  1) The nodeJS API directly responds "OK 200" to the client

  2) The nodeJS server asynchronously downloads the image using npm axios library, then saves that image to current directory, then asynchronously launchs a heavy tool that convert
  the image to a video (can take some time), then sends an email to the client.

  In my design everything occurs on the same server (NodeJS API).
  I think this isn’t a good design at all and I should separate the Nodejs HTTP API and the heavy tasks video processing server.
  However, this separation means communicating image from a server to another one and i don’t know how to do that.

  I think there are useful services that I could use on AWS but I don’t know which one and how.

  Would it be possible to help me in the design of this application (and which cloud services could I use ?)

• How to extract single image (with different name each time) from multiple videos in the one folder using ffmpeg bash script

  15 juillet 2014, par morriscotty_sd

  Let’s start with this... I’m fairly new to Linux.

  I have been looking into ffmpeg to extract an image from a video using the terminal. I’ve accomplished this using this piece of code :

     ffmpeg  -itsoffset -4  -i oggvideo.ogg -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 oggThumb.jpg

  I run this when I’m in the directory which holds the videos in my project. But what I want is to extract an image from all videos in that folder at the same time, naming the image corresponding with the video name it’s extracted from. My end goal is to have a folder which will hold videos that a user uploads, and at a certain time the script will run and extract images from the uploaded videos, saving the image path to a database.

  I found this line of code :

  for %%i in (*.mp4) do ffmpeg -ss 20 -i %%i -t 1 -s 590x340 -f image2 %%i.jpg

  from this site : Trying-to-extract-1-image-from-multiple-videos-with-FFMPEG

  I run that in the terminal and it gives me the error : ’bash : syntax error near unexpected token `(’’
  I tried removing the ’( )’ but then it just takes me onto a new line. This is where I’m having the most problems due to being relatively new to linux commands.

  Any suggestions or advice would be very helpful.

• AForge FFMPEG Video operation issue

  9 janvier 2017, par Berkay

  I have a problem actually an issue about making video of images(captured frames). I am using nVLC to capture my IP camera’s video content. I managed to take these and show them in my application whenever a new frame comes up. But I also need to convert them whenever a user wants to save the record. This record should be long enough like 1-2 hours.

  So I decided to use AForge lib. In this library there is a class called VideoFileWriter.It does what I want. But here is the problem. I am getting 24-25 frames per second and I am drawing it on the screen. This causes a little bit of an overhead to my system (Especially when I am streaming 6 IP cameras to my screen). My CPU is utilized like %50-60 and i am using 500-550 MB of RAM while streaming 6 IP cameras and drawing to my screen.

  So I came up with two ideas,

  • I can process (write to a video file) each frame whenever I capture. (If user starts recording)
  • Or, I can store Bitmaps (captured frames) whenever user starts recording. Then I can process these list of (might be an array or List<> or another container etc...) later.

  The first approach will destroy my pc, because read/write is very very expensive operations for computers, so this will put me in a very bad position.

  Second approach will destroy my ram, because I may end up with 3600*25 frames for each bitmap list. But seems to be the better choice to me.

  Does anyone have any advice on this topic ?