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• Capture video using FFMPEG without frozen image effect

  27 juillet 2020, par Nehemia

  Anyone could help me ? Have been trying to record video from an RTSP server using FFMPEG but somehow the video result has many frozen images (couldn't be used for any people detection) - the people look similar to this :


  



  Here is the code I used :

  



  


  ffmpeg -i rtsp ://10.10.10.10/encoder1 -b:v 1024k -s 640x480 -an -t 60 -r 12.5 output.mp4

  


  



  What I have done so far ?
- Recorded the video in smaller dimension instead of original one
- No audio and lower FPS
- Even only record from two IP sources on a machine

  



  But still didn't get any luck yet. Anyone ever experience this ?

  


• YUV values for a given macroblock in an AVFrame

  10 avril 2019, par Enock

  I am trying to find the pixels value for a given macroblock in a frame.
  What I did is the following :

  //for all macroblock in this frame
  
   mb_height and mb_width are the number of macroblock horizontally and 
  
   vertically in the frame
  
  for(int mby=0; mby/Now for this 16x16 macroblock
  
          16 is the dimension of the macroblock (16x16 macroblock)
  
          for(int y=0; y<16;y++)
  
          {
  
              for(int x=0; x<16;x++)
  
              {
  
                  //All pixels YUV value for this macroblock
  
                  y = data[0][linesize[0]*y+x];
  
                  u = data[1][linesize[1]*(y/2)+x/2]
  
                  v = data[2][linesize[2]*(y/2)+x/2]
  
             }
  
          }
  
           #Let's go to an other macroblock
  
       }
  
  }

  The problem is that for all macroblocks, I have the same Y, u and v
  value. That’s is true because I only use the same width and height for every macroblock.
  My question is to know how can I put difference in the above code to find pixels yuv value for each macroblock in this frame.Perhaps I must use macroblock’s coordinate (MBX, MBY) or associated motion vector’s coordinate(mvx, mvy) to have this difference but I don’t know how to do so. The mbx and mby in the above loop are not mocroblock’s coordinate but integers for the loop.
  I need your help, please.

• PHP FFMPEG - Convert .mov to .mp4 (H264)

  5 novembre 2019, par Alex

  I’ve recently installed the PHP-FFMpeg lib on a server and used the following tutorial :
  https://github.com/PHP-FFMpeg/PHP-FFMpeg

  I managed to convert a .mov video (uploaded through a mobile device) to webm and ogg but when encoding to mp4 I always get an "Encoding Failed" message from the error object (in a try catch).

  This is the code I’m using after instantiating FFMPEG

      $video->filters()->resize(new FFMpeg\Coordinate\Dimension(756, 461), $mode = RESIZEMODE_SCALE_WIDTH)->synchronize();
  
  
  
  $video->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(10))->save('sites/default/files/videos/thumbnails/'.$filename.'.jpg');
  
  
  
  $video->save(new FFMpeg\Format\Video\Ogg(), 'sites/default/files/videos/'.$filename.'.ogg')
  
        ->save(new FFMpeg\Format\Video\X264(), 'sites/default/files/videos/'.$filename.'.mp4')
  
        ->save(new FFMpeg\Format\Video\WebM(), 'sites/default/files/videos/'.$filename.'.webm');

  Thanks for your help !