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• ffmpeg code changes

  12 juillet 2012, par toutou0091

  To install FFmpeg, I followed the instructionsin this web sit http://buildall.wordpress.com/2011/05/09/how-to-compile-and-install-ffmpeg-in-ubuntu-11-04/ and it works well. In the file "mpegvideo_enc.c" there is a variable called "qp". I added in this file the istruction printf to display this varaible. I redid after : ". / configure" and "make" and it works as well. The Result of this compilation gives no executable file. I would like to know why the printf that I added in the code is not displayed ?
  Thank u in advance.

• FOR FFMPEQ CODE LIVE [on hold]

  20 août 2017, par Trung lê

  One user live streaming and he used ffmpeg with 1 pc : 1core,1GB ram AND LIVE WITH 20 threads EVENTS ON YOUTUBE @@ unbelievable . i would like need "code live", can i help you ? tks very much
  https://ffmpeg.org/documentation.html

• Different code(.java file) for different platform ?

  2 mars 2016, par AR792

  I have a code where image data is passed from bitmap to FFmpeg frame recorder and converted to a video. But i need to make small changes while running it on LG G3(armv7) from Asus zenfone 5(x86).

  Following are the class variables that create the issue :(declared under, class Main Activity)

  inputWidth = 1024 ;

  inputHeight = 650 ;

  Following is the method where the issue occurs :

   byte [] getNV21(int inputWidth, int inputHeight, Bitmap bitmap) {
  
  
  
      int [] argb = new int[inputWidth * inputHeight];
  
  
  
      bitmap.getPixels(argb, 0, inputWidth, 0, 0, inputWidth, inputHeight);
  
  
  
      byte [] yuv = new byte[inputWidth*inputHeight*3/2];
  
      encodeYUV420SP(yuv, argb, inputWidth, inputHeight);
  
  
  
      return yuv;
  
  }
  
  
  
  void encodeYUV420SP(byte[] yuv420sp, int[] argb, int width, int height) {
  
      final int frameSize = width * height;
  
  
  
      int yIndex = 0;
  
      int uvIndex = frameSize;
  
  
  
      int a, R, G, B, Y, U, V;
  
      int index = 0;
  
      for (int j = 0; j < height; j++) {
  
          for (int i = 0; i < width; i++) {
  
  
  
              a = (argb[index] & 0xff000000) >> 24; // a is not used obviously
  
              R = (argb[index] & 0xff0000) >> 16;
  
              G = (argb[index] & 0xff00) >> 8;
  
              B = (argb[index] & 0xff) >> 0;
  
  
  
              // well known RGB to YUV algorithm
  
              Y = ( (  66 * R + 129 * G +  25 * B + 128) >> 8) +  16;
  
              U = ( ( -38 * R -  74 * G + 112 * B + 128) >> 8) + 128;
  
              V = ( ( 112 * R -  94 * G -  18 * B + 128) >> 8) + 128;
  
  
  
              // NV21 has a plane of Y and interleaved planes of VU each sampled by a factor of 2
  
              //    meaning for every 4 Y pixels there are 1 V and 1 U.  Note the sampling is every other
  
              //    pixel AND every other scanline.
  
              yuv420sp[yIndex++] = (byte) ((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));
  
              if (j % 2 == 0 && index % 2 == 0) {
  
                  yuv420sp[uvIndex++] = (byte)((V<0) ? 0 : ((V > 255) ? 255 : V));
  
                  yuv420sp[uvIndex++] = (byte)((U<0) ? 0 : ((U > 255) ? 255 : U));
  
              }
  
  
  
              index ++;
  
          }
  
      }
  
  }

  Working CODE :

  LG G3 :I can use the above variables at any place in the code to get the required output.
  Bitmap size returned = 2734200

  Asus Zenfone 5 : Except at creating the bitmap, I have to use everywhere else bitmap.getHeight() and bitmap.getWidth(), to get the required output.

  Surprisingly here Bitmap size returned = 725760 (So its not setting according to set bitmap parameters ?)

  INCORRECT CODE :

  LG G3 : IF i use bitmap.getHeight() and bitmap.getWidth(), i get java.lang.ArrayIndexOutOfBoundsException : length = 102354 , index = 102354. @getNV21 method

  Asus Zenfone 5 : If i use inputWidth , inputHeight i get
  java.lang.IllegalArgumentException : x + width must be <= bitmap.width() @getNV21 method

  How can i generalize the above code for both phones ?