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• lavu/hwcontext_qsv : add support for 12bit content on Linux

  6 octobre 2022, par Fei Wang

  lavu/hwcontext_qsv : add support for 12bit content on Linux
  P012, Y212 and XV36 are used for 12bit content in FFmpeg VAAPI, so
  
  these formats should be used in FFmpeg QSV too, however the SDK only
  
  declares support for P016, Y216 and Y416. So this commit fudged mappings
  
  between AV_PIX_FMT_P012 and MFX_FOURCC_P016, AV_PIX_FMT_Y212 and
  
  MFX_FOURCC_Y216, AV_PIX_FMT_XV36 and MFX_FOURCC_Y416.
  Signed-off-by : Fei Wang <fei.w.wang@intel.com>
  
  Signed-off-by : Wenbin Chen <wenbin.chen@intel.com>
  
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavutil/hwcontext_qsv.c

• How to use ffmpeg Library in electron？

  24 avril 2022, par MrL

  I use ffmpeg in electronic, but uwp can't use the command line, so I want to use ffmpeg library instead, and install "FFI NaPi". After testing, it can call the library, but I don't know C language and how to call ffmpeg library. Can anyone help me ?

  


  This is my test of "ffi napi". It can really succeed：

  


  c++ code :

  


  extern "C" __declspec(dllexport) int add(int a, int b) {

    return 20;
};


  


  electron js :

  


   var ffi = require('ffi-napi');
    var libm = ffi.Library('Dll1.dll', {
      'add': [ 'int', [ 'int', 'int' ] ],
    });
    
    var rel = libm.add(1,2); // 20
    console.error('rel:',rel);


  


  This is the download website of ffmpeg library：
https://github.com/wang-bin/avbuild

  


  [enter image description here][1]
[enter image description here][2]
[enter image description here][3]
[enter image description here][4]


  [1]: https://i.stack.imgur.com/HTMhK.png
  [2]: https://i.stack.imgur.com/hxsw4.png
  [3]: https://i.stack.imgur.com/5mDLx.png
  [4]: https://i.stack.imgur.com/HAjPE.png


  


  I have no programming knowledge of C + + and do not know how to call these libraries. I just want to edit a video, for example :

  


  ffmpeg -i a.mp4 -c -copy b.mp4


  


• building a shared library using android studio ( regarding FFMPEG/Libav Fast Fourier Transform)

  1er juin 2017, par Bishop Duperret

  I’m building some software for android and I’m desperately in need of a faster FFT function than I am currently using.

  After researching I found that libav/FFMPEG have really good FFT functions tailored for the ARM architecture.

  1) What is the most straight forward way to build either libraries as a .SO ?
  (There’s so much info out there I’m overwhelmed)

  2) Since I ONLY need access to the FFT, would it be possible to simple build that c class, license permitting ? Last I checked there was some ARM code so that may complicate it.

  Any help is greatly appreciated !