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• how to use ffmpeg buld libraries in android studio ?

  16 octobre 2018, par Dilchun Dev

  I have build ffmpeg libs for android using tutorial provided by
  https://medium.com/@karthikcodes1999/cross-compiling-ffmpeg-4-0-for-android-b988326f16f2

  but I don’t know how to use the libraries in my android project.

  please help me

• exception on ffmpeg dll from a c++ visual studio 2015 project

  1er juillet 2017, par user1019140

  I want to use ffmpeg library in a Visual Studio project.
  I want to build an app for WIN32, so I downloaded :

  C:\Users\exa\Downloads\ffmpeg-3.3.2-win32-shared.zip
  
  C:\Users\exa\Downloads\ffmpeg-3.3.2-win32-dev.zip

  I copied the dlls from the shared zip to the same directory as my generated exe file. And I unzipped the dev zip into a directory of a different project of the same solution called MEDIA_IO.

  Then in the project properties , I added "additional include directories" :

  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\include

  and under the linker, I added "Link library dependencies" :

  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib

  and "Additional dependencies" :

  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\swscale.lib
  
  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\avutil.lib
  
  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\avcodec.lib
  
  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\avformat.lib
  
  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\avfilter.lib
  
  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\postproc.lib
  
  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\swresample.lib
  
  ..\MEDIA_IO\ffmpeg-3.3.2-win32-dev\lib\avdevice.lib

  I include the headers using :

  extern "C"
  
  {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavutil></libavutil>imgutils.h>
  
  #include <libavutil></libavutil>samplefmt.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  #include <libavutil></libavutil>avstring.h>
  
  #include <libavutil></libavutil>intreadwrite.h>
  
  }

  The app compiles fine, but when running it, I’m getting exceptions on many different ffmpeg functions.

  For examples, when running :

  SwsContext * ctx = sws_getContext(560, 320, AV_PIX_FMT_YUV420P, 560,320, AV_PIX_FMT_RGB24, 0, NULL, NULL, NULL);

  I get exception :

  Exception thrown at 0x57E05140 (swscale-4.dll) in UnitTest1.exe: 0xC0000006: In page error executing location 0x57E05140 (status code 0xC0000008).
  
  Unhandled exception at 0x57E05140 (swscale-4.dll) in UnitTest1.exe: 0xC0000006: In page error executing location 0x57E05140 (status code 0xC0000008).

  It does not tell what are status codes 0xC0000006 and 0xC0000008.
  I dug a lot and could not find the source of the problem.

• How to link and call function of prebuild static native library from android studio

  23 janvier 2017, par Janaki

  I need to change pitch and time stretching of an audio. For this I am using prebuild static library. Currently I am having libZtxAndroid.a static library and corresponding header file which contains function declaration. But I don’t know how to load this library in my android studio app and call native function from java code. I explored many links and tried to load this library. But all attempts are failed. This is the one link which I have tried last time https://tariqzubairy.wordpress.com/2012/03/12/use-of-prebuild-static-library-compiled-with-android-toolchain/

  Also I am using FFMPEG shared library and MP4Parser (https://github.com/sannies/mp4parser) library in this app for adding water mark to video and merging audio respectively. Can any one help from basics.

  1. How to load static library ?
  2. Where I need to place that static library ?
  3. Where I need to create jni folder (folder structure) ?
  4. How to call function available in that static library with the help of header file from java code ?