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• How to build opencv_ffmpeg.so for Linux/MacOS

  27 octobre 2016, par Black

  How to build opencv_ffmpeg.so like opencv_ffmpeg.dll in Windows for OpenCV use in java app.
  I followed build guide of FFmpeg.org but when build completed, it just generated many lib*.so.
  How to build opencv_ffmpeg.so for shipping in my java application and load it dynamically when app runs ?

• OBS alternative for server : Creating a continuous video streaming to RTMP server and beign able to manipulate it using NodeJS

  27 juillet 2016, par futufu

  What I want is to be able to create a livestream from a Ubuntu v14.04 server to a RTMP Server (like Twitch) and to be able to use NodeJS to control visual aspects (adding layers, text, images) and add different sources (video files, others livestreams, etc). Like having OBS running on a server.

  What I’ve done/researched so far :

  FFmpeg

  With ffmpeg I can can create video files streams like that :

  ffmpeg -re -i video.mp4 -c:v libx264 -preset fast -c:a aac -ab 128k -ar 44100 -f flv rtmp://example.com

  Also using the filter_complex I can create something near to a layer like this tutorial explains :
  https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

  But I found the following problems :

  • The streams that I create with ffmpeg only last until the video file is over, if I wanted to stream multiple video files (dynamic playlist) it would interrupt the stream between each file ;
  • The manipulation is very limited as far as I am concerned, I can’t edit filter_complex once ffmpeg is executing ;
  • Can’t display text and create animated overlays, like sliding text.

  I tried to search for any cli/nodejs package that is able to create a continuos video stream and manipulate it to use as input source for ffmpeg which streams to the RTMP server.

  Can someone give me more information about what I am trying to do ?

  I’m playing with github.com/fluent-ffmpeg/node-fluent-ffmpeg to see if I have a different outcome.

• how to fill AvFrame pixel by pixel

  18 mai 2017, par masoud khanlo

  i try to encode opengl output to a mp4 file using ffmpeg but when i want to simply fill AvFrame with pixel colors with this code snippet :

  for (y = 0; y < c->height; y++) {
  
  for (x = 0; x < c->width; x++) {
  
      int offset = 3 * (x + y * c->width);
  
  
  
      if (x > 2* c->width / 3 && x width )
  
      {
  
          frame->data[0][offset + 0] = 0; // B
  
          frame->data[0][offset + 1] = 0; // G
  
          frame->data[0][offset + 2] = 255; // R
  
      } 
  
      else if(x < 2 * c->width / 3 && x > c->width / 3) {
  
          frame->data[0][offset + 0] = 0; // B
  
          frame->data[0][offset + 1] = 255; // G
  
          frame->data[0][offset + 2] = 0; // R
  
      }
  
      else {
  
          frame->data[0][offset + 0] = 255; // B
  
          frame->data[0][offset + 1] = 0; // G
  
          frame->data[0][offset + 2] = 0; // R
  
      }
  
  }

  then i have this video output :

  

  and i had this options for ffmpeg :

  codec : libx264rgb
  & pix_fmt : AV_PIX_FMT_BGR24

  in fact i expect something like this video output :

  

  i’m also new in ffmpeg and i realy dont know advanced stuffs about video encoding ,so anybody knows what is problem ?