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• Link FFmpeg with CMake on Windows

  6 juillet 2021, par ldall03

  I'm new to CMake and I've been scratching my heads for a couple of days on this. I downloaded the FFmpeg source code and built it without issues. I got a lib folder and an include folder which I placed in my project structure :

  


  project
   \--- build
   \--- dep
      \---ffmpeg
         \--- include
         \--- lib
   main.cpp
   CMakeLists.txt


  


  Here is my CMakeLists.txt :

  


  cmake_minimum_required(VERSION 3.19)
project(VidShare)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

add_executable(VidShare main.cpp)
include_directories(dep/ffmpeg/include)
target_link_libraries(VidShare
        ${CMAKE_SOURCE_DIR}/dep/ffmpeg/lib/libavformat.a
        ${CMAKE_SOURCE_DIR}/dep/ffmpeg/lib/libavcodec.a)


  


  and here is my main.cpp :

  


  extern "C" {&#xA;#include "libavcodec/avcodec.h"&#xA;#include "libavformat/avformat.h"&#xA;}&#xA;&#xA;#include <iostream>&#xA;&#xA;int main() {&#xA;    AVFormatContext *pFormatContext = avformat_alloc_context();&#xA;    return 0;&#xA;}&#xA;</iostream>

  


  As soon as I add this line of code : AVFormatContext *pFormatContext = avformat_alloc_context(); I get this error when building in CLion :

  


  [ 50%] Linking CXX executable VidShare.exe
CMakeFiles\VidShare.dir/objects.a(main.cpp.obj): In function `main':
D:/Users/dalla/Documents/Coding Projects/C++/VidShare/main.cpp:9: undefined reference to `avformat_alloc_context'
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[3]: *** [CMakeFiles\VidShare.dir\build.make:107: VidShare.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles\Makefile2:94: CMakeFiles/VidShare.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles\Makefile2:101: CMakeFiles/VidShare.dir/rule] Error 2
mingw32-make.exe: *** [Makefile:136: VidShare] Error 2


  


  I'm guessing this is a linker error and that I don't know how to link it properly (might be something stupid I am missing) as avformat_alloc_context() seems to be in the header file. Anyways, I'm quite desperate and some help would be appreciated.

  


  I am using :

  


  

  • MinGW

  


  • CLion

  


  • Windows 10

  


  • CMake

  


  


• avfilter/buffersrc : limit link variance logs below debug loglevel

  26 janvier 2024, par Gyan Doshi

  avfilter/buffersrc : limit link variance logs below debug loglevel
  The video param change check will print loglines below debug level
  
  for each frame which is different from the inlink parameters. This
  
  can spam the console. It is now printed at warning level once for
  
  each param change else it is kept at debug level.
  Partially addresses #10823
  

  • [DH] libavfilter/buffersrc.c

• d3d11va : Link directly to dxgi.dll and d3d11.dll functions if LoadLibrary is unavailable

  9 juin 2017, par Martin Storsjö

  d3d11va : Link directly to dxgi.dll and d3d11.dll functions if LoadLibrary is unavailable
  When targeting the UWP API subset, the LoadLibrary function is not
  
  available (and the fallback, LoadPackagedLibrary, can’t be used to
  
  load system DLLs). In these cases, link directly to the functions
  
  in the DLLs instead of trying to load them dynamically at runtime.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] configure
  • [DBH] libavutil/hwcontext_d3d11va.c