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• How to optimize YUV to RGB color conversion code

  1er février 2016, par user_12

  I have written a function to convert an image in YUV420P to RGB but it is taking 30 millisecond to convert an image (size : 1280 x 720) into RGB, but when I am using ffmpeg function ( as this) to convert YUV image into RGB its taking only 2 millisecond for the same image. What is the problem with my code ? How can I optimize the code that I have written ??
  My code is given below

   int step = origImage->widthStep;
  
   uchar *data = (uchar *)origImage->imageData; 
  
   int size = origImage->width * origImage->height;
  
   IplImage* img1 = cvCreateImage(cvGetSize(origImage), IPL_DEPTH_8U, 3);
  
  
  
      for (int i = 0; iheight; i++)
  
      {
  
        for (int j=0; jwidth; j++)
  
        {
  
          float Y = data[i*step + j];
  
          float U = data[ (int)(size + (i/2)*(step/2)  + j/2) ];
  
          float V = data[ (int)(size*1.25 + (i/2)*(step/2) + j/2)];
  
  
  
          float R = Y + 1.402 * (V - 128);
  
          float G = Y - 0.344 * (U - 128) - 0.714 * (V - 128);
  
          float B = Y + 1.772 * (U - 128);
  
  
  
  
  
          if (R < 0){ R = 0; } if (G < 0){ G = 0; } if (B < 0){ B = 0; }
  
          if (R > 255 ){ R = 255; } if (G > 255) { G = 255; } if (B > 255) { B = 255; }
  
  
  
          cvSet2D(img1, i, j,cvScalar(B,G,R));
  
        }
  
      }

• Sample RTP code to stream x264 data

  5 août 2016, par Ajay Ponna Venkatesh

  I am using x264 library to encode frames and I need to stream it to a client which will receive the frame, decode and render it.
  Currently, I have borrowed the code from OBS to stream through RTMP and have written a client using FFMPEG’s RTMP code to receive this data. BUT RTMP works on TCP and I now need to stream over UDP. OBS doesn’t seem to support any other protocols than RTMP.

  So, I decided to use RTP. I can write a client to receive and decode using FFMPEG since it supports RTP just like RTMP. Can anyone please help me with sample code to stream x264 encoded data through plain RTP ? (I don’t want to complicate by using RTSP etc. along with RTP).

  The requirement is simple. Say, I use ffplay -> ffplay.exe rtp ://127.0.0.1:17000 then I want this sample code to be able to send data through RTP (over UDP) and ffplay should be able to play. I can take it over from there. Thanks in advance !

  -Ajay

• Anomalie #3851 (Fermé) : Référencer code.plugins.spip.net

  8 février 2017

  Done. Dans la barre d’onglets.
  http://code.spip.net/