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• how to use x264 dll in another project

  5 août 2014, par Hadi Rasekh

  enter code here I want to use x264 in my project. There is some line in the code said :

  /* Application developers planning to link against a shared library version of
* libx264 from a Microsoft Visual Studio or similar development environment
* will need to define X264_API_IMPORTS before including this header.
* This clause does not apply to MinGW, similar development environments, or non
* Windows platforms. */

  But I don’t get this line :
  define X264_API_IMPORTS before including this header

  We can create x264 dll by its configuration and make

      ./configure --enable-shared
  
      make

  but I can not use the dll in my Qt Project.

  I can make my own dll (in another code) and use it in the project.
  But when I start to use x264 dll in my project I get the following error :

      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
  
      'pulldown_frame_duration' was not declared in this scope
  
      qDebug() << pulldown_frame_duration[1];
  
               ^

• how to use x264 dll in another project

  5 août 2014, par Hadi Rasekh

  enter code here I want to use x264 in my project. There is some line in the code said :

  /* Application developers planning to link against a shared library version of
* libx264 from a Microsoft Visual Studio or similar development environment
* will need to define X264_API_IMPORTS before including this header.
* This clause does not apply to MinGW, similar development environments, or non
* Windows platforms. */

  But I don’t get this line :
  define X264_API_IMPORTS before including this header

  We can create x264 dll by its configuration and make

      ./configure --enable-shared
  
      make

  but I can not use the dll in my Qt Project.

  I can make my own dll (in another code) and use it in the project.
  But when I start to use x264 dll in my project I get the following error :

      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
  
      'pulldown_frame_duration' was not declared in this scope
  
      qDebug() << pulldown_frame_duration[1];
  
               ^

• FFMPEG Motion Compensation and Search

  20 juin 2016, par Tina Jasmin

  I’m trying to modify the motion detection part of FFMPEG. What I want to do is to extend the search space, so that whenever the macroblock hit the right most edge of the frame, I need it to still move the block towards the left-most as if they are connected (in my example videos, the right edge is actually a continue of the left edge). Can someone help me to point where exactly I can modify it within FFMPEG source code or x265, or x264 ?

  

  I took H265 as an example from here. It has a motion.cpp file which nicely specifies the possible block sizes as below. But I can’t find the specific loop that traverses the frame. A help is highly appreciated.

  #define SETUP_SCALE(W, H) \
  
      sizeScale[LUMA_ ## W ## x ## H] = (H * H) >> 4;
  
      SETUP_SCALE(4, 4);
  
      SETUP_SCALE(8, 8);
  
      SETUP_SCALE(8, 4);
  
      SETUP_SCALE(4, 8);
  
      SETUP_SCALE(16, 16);
  
      SETUP_SCALE(16, 8);
  
      SETUP_SCALE(8, 16);
  
      SETUP_SCALE(16, 12);
  
      SETUP_SCALE(12, 16);
  
      SETUP_SCALE(4, 16);
  
      SETUP_SCALE(16, 4);
  
      SETUP_SCALE(32, 32);
  
      SETUP_SCALE(32, 16);
  
      SETUP_SCALE(16, 32);
  
      SETUP_SCALE(32, 24);
  
      SETUP_SCALE(24, 32);
  
      SETUP_SCALE(32, 8);
  
      SETUP_SCALE(8, 32);
  
      SETUP_SCALE(64, 64);
  
      SETUP_SCALE(64, 32);
  
      SETUP_SCALE(32, 64);
  
      SETUP_SCALE(64, 48);
  
      SETUP_SCALE(48, 64);
  
      SETUP_SCALE(64, 16);
  
      SETUP_SCALE(16, 64);
  
  #undef SETUP_SCALE

  UPDATE :

  One way to do that (in x265) is to modify the edge extension area (which is already in the code, in the frameFilter.cpp), and do that for rightmost and fill blocks with leftmost pixels. I identified the piece of code here. Can someone help me to add this feature for right-to-left extension ?

  if ((col == 0) | (col == m_frameFilter->m_numCols - 1))
  
      {
  
          // TODO: improve by process on Left or Right only
  
          primitives.extendRowBorder(reconPic->getLumaAddr(m_rowAddr), stride, reconPic->m_picWidth, realH, reconPic->m_lumaMarginX);
  
  
  
          if (m_frameFilter->m_param->internalCsp != X265_CSP_I400)
  
          {
  
              primitives.extendRowBorder(reconPic->getCbAddr(m_rowAddr), strideC, reconPic->m_picWidth >> hChromaShift, realH >> vChromaShift, reconPic->m_chromaMarginX);
  
              primitives.extendRowBorder(reconPic->getCrAddr(m_rowAddr), strideC, reconPic->m_picWidth >> hChromaShift, realH >> vChromaShift, reconPic->m_chromaMarginX);
  
          }
  
      }
  
  
  
      // Extra Left and Right border on first and last CU
  
      if ((col == 0) | (col == m_frameFilter->m_numCols - 1))
  
      {
  
          copySizeY += lumaMarginX;
  
          copySizeC += chromaMarginX;
  
      }
  
  
  
      // First column need extension left padding area and first CU
  
      if (col == 0)
  
      {
  
          pixY -= lumaMarginX;
  
          pixU -= chromaMarginX;
  
          pixV -= chromaMarginX;
  
      }