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• 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.

• OpenCV compilation : How to specify the location of FFmpeg library with cmake

  6 juin 2017, par Beanocean

  I want to compile OpenCV-2.13.2 with gcc-4.8.2, but the version installed in system path is gcc-4.4.6. So I installed gcc-4.8.2 in /opt/compiler/gcc-4.8.2. I compiled FFmpeg successfully with gcc-4.8.2. When I tried to compile OpenCV, I met with some problems.

  In linking stage, there were some libraries can not be found by /opt/compiler/gcc-4.8.2/bin/ld. The error message is as follows :
  

  The missing libraries are related with FFmpeg, and I have installed FFmpeg in ~/local/lib. Then I checked the file module/core/CMakeFiles/opencv_pref_core.dir/link.txt, It shows as follows :
  

  The ld just did not search the path where I installed FFmpeg. I tried two methods :

  1. add FFmpeg path to env : export LD_LIBRARY_PATH=~/local/lib:$LD_LIBRARY_PATH ;
  2. add -D FFMPEG_INCLUDE_DIRS=~/local/include -D FFMPEG_LIBRARAY_DIRS=~/local/lib to cmake options

  They did not work at all.

• Getting ffprobe or avprobe not found while using youtube_dl module

  26 décembre 2016, par Avinash

  import youtube_dl
  
  
  
  
  
  options = {
  
      'format':'bestaudio/best',
  
      'extractaudio':True,
  
      'audioformat': 'mp3',
  
      'outtmpl':'%(id)s.%(ext)s',
  
      'noplaylist':True,
  
      'nocheckcertificate':True,
  
      'postprocessors': [{
  
          'key': 'FFmpegExtractAudio',
  
          'preferredcodec': 'mp3',
  
          'preferredquality': '192',
  
      }],
  
  
  
  }
  
  
  
  with youtube_dl.YoutubeDL(options) as ydl:
  
      ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])

  I am Getting

  "youtube_dl.utils.DownloadError : ERROR : ffprobe or avprobe not found.
  Please install one."

  I downloaded ffmpeg and tried giving its bin folder location in path variable . I also tried copying that bin folder to my youtube_dl package folder. None of them worked.

  Thanks in advance.