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• How to compare the difference between 2 videos color in ffmpeg ?

  3 décembre 2014, par nico_lab

  I have read How to compare/show the difference between 2 videos in ffmpeg ? , but "blend=all_mode=difference" is green.
  How do I get more colorful diffrence using blend filter ?

  sample command is

  ffplay -f lavfi "movie=left.mp4,split[a1][a2]; movie=right.mp4,split[b1][b2]; [a1][b1]blend=all_mode=difference[blend];[a2]pad=2*iw:2*ih[left];[left][b2]overlay=w[tmp];[tmp][blend]overlay=0:h"

  using "hue=s=0", color is chenge monochrome.

  ffplay -f lavfi "movie=left.mp4,split[a1][a2]; movie=right.mp4,split[b1][b2]; [a1][b1]blend=all_mode=difference,hue=s=0[blend];[a2]pad=2*iw:2*ih[left];[left][b2]overlay=w[tmp];[tmp][blend]overlay=0:h"

  The goal is this video. if you have a niconico account.
  http://www.nicovideo.jp/watch/sm24864058

  if you don’t have a niconico account, embed page is
  http://www.nicozon.net/watch/sm24864058

• What is the difference between ffmpeg and opencv when recording screen ? [closed]

  12 août 2022, par Sadık Demir

  I am making a screen recording app with Qt. I tried both libraries. CPU load is less in Opencv. What is the reason of this ? (About 10% difference between).
Opencv Code :

  


     while( 1 )
{
    Mat src = hwnd2mat(hwndDesktop);
    imshow("output", src);

    cvtColor(src,src,COLOR_BGRA2BGR);


    if(src.data)
        writer.write(src);
    int c = waitKey(1);
    if((char)c == 'c')
        break;
}


  


• Révision 23633 : Retour sur r23632 : magouille de / ou \ entre les systèmes d’exploitations. On re...

  3 juillet 2017, par marcimat@rezo.net

  En attendant, on corrige au moins impactant.