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• 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.

• 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.

• ffmpeg can't work via nginx + nginx-rtmp-module

  2 mai 2018, par Ubunkun

  nginx version : nginx/1.12.2
  ffmpeg version 3.4.2

  I’m trying to below.
  -> nginx -> ffmpeg multi encode -> HLS publish

  nginx configration is below (nginx.conf)

  worker_processes  1;
  
  
  
  events {
  
      worker_connections  1024;
  
  }
  
  
  
  http {
  
      include       mime.types;
  
      default_type  application/octet-stream;
  
  
  
      sendfile        on;
  
  
  
      keepalive_timeout  65;
  
  
  
      server {
  
          listen       80;
  
          server_name  localhost;
  
  
  
          location / {
  
              root   html;
  
              index  index.html index.htm index.php;
  
          }
  
  
  
      location ~ \.php$ {
  
              root           html;
  
              fastcgi_pass   unix:/var/run/php-fpm/php-fpm.sock;
  
              fastcgi_index  index.php;
  
              fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
  
              include        fastcgi_params;
  
          }
  
  
  
          error_page   500 502 503 504  /50x.html;
  
          location = /50x.html {
  
              root   html;
  
          }
  
      }
  
  }
  
  
  
  rtmp {
  
      server {
  
          listen 1935;
  
          application hls {
  
              live on;
  
              exec /usr/local/sbin/ffscript.sh $name;
  
          }
  
  
  
          application hls2 {
  
              live on;
  
              hls on;
  
              hls_path /usr/local/nginx/html;
  
              hls_nested on;
  
              hls_fragment 9s;
  
              hls_variant _low  BANDWIDTH=300000;
  
              hls_variant _mid  BANDWIDTH=700000;
  
              hls_variant _high BANDWIDTH=1200000;
  
          }
  
      }
  
  }

  (/usr/local/sbin/ffscript.sh)

  export LIBVA_DRIVERS_PATH=/opt/intel/mediasdk/lib64
  
  export LIBVA_DRIVER_NAME=iHD
  
  export MFX_HOME=/opt/intel/mediasdk
  
  export PKG_CONFIG_PATH=/opt/intel/opencl:
  
  
  
  /usr/local/bin/ffmpeg -i rtmp://localhost/hls/${1} -vcodec h264_qsv -init_hw
  
  _device qsv:hw -b:v 128K -c:a aac -ar 44100 -ac 2 -r 30 -f flv rtmp://localhost/
  
  hls2/${1}_low -b:v 512k -c:a aac -ar 44100 -ac 2 -r 30 -f flv rtmp://localhost/h
  
  ls2/${1}_mid -b:v 1024k -c:a aac -ar 44100 -ac 2 -r 30 -f flv rtmp://localhost/h
  
  ls2/${1}_high

  But it can’t work. The access.log appears just one line.

  192.168.1.121 [02/May/2018:21:52:39 +0900] PUBLISH "hls" "test2" "" - 580840 753 "" "FMLE/3.0 (compatible; Lavf57.55" (21s)

  There is no "hls2" PUBLISH on access log.

  When I tried to run the ffmpeg command line while nginx is running, it was succeed.

  Why ffmpeg called by nginx doesn’t work ? If you have any solution, let me know.

  Bests,