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• Steps of using ffmpeg in visual studio 2019 ? [closed]

  15 avril 2020, par taimoor1990

  I have to use ffmpeg libraries which I am new to. Currently I am trying to build a basic hello world application that uses ffmpeg. I have googled multiple times there are some answers, saying something like static include these libraries and such comments which I am not sure how. I am looking for a step by step guide to link ffmpeg with a basic hello world app.

  


• 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));
  
        }
  
      }

• capturing video with static image on screen corner in android

  21 juin 2012, par Rahul Upadhyay

  I am trying to capture a video with Static Image on it, and then want to save that Video with the same image on Video, how to do that ?
  I read so many articles and i get to know that it will be done with the help of FFMPEG. But i don't know how to do that, can anybody please guide me through it.

  the screen will be look like this,