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• Point CMake project to specific include file

  16 novembre 2011, par Unapiedra

  I am trying to build OpenCV 2.3.0 with FFMPEG enabled. Since Ubuntu 11.10 only supplies libavcodec/format with version 0.7 and the ticket #1020(link below) indicates that it should work with 0.8.

  If I try to compile I get the following error :

  [ 18%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.o
  
  In file included from /home/chris/src/OpenCV-2.3.0/modules/highgui/src/cap_ffmpeg.cpp:45:0:
  
  /home/foo/src/OpenCV-2.3.0/modules/highgui/src/cap_ffmpeg_impl.hpp:103:36: fatal error: libavformat/avformat.h: No such file or directory
  
  compilation terminated.

  This file lives in /opt/linux64-debug/include/ffmpeg/libavformat/avformat.h. I tried pointing make at that with CMAKE_INCLUDE_DIRECTORY,PATH, CMAKE_PREFIX_PATH and CMAKE_LIBRARY_PATH. None of that worked. ( I always used the path /opt/linux64-debug/include/ffmpeg.)

  https://code.ros.org/trac/opencv/ticket/1020

• A C language ffmpeg project organized with CMakeLists, encounters errors in the Windows MinGW64 environment

  20 juin 2023, par flywen

  Project Structure

  


  ffmpeg-tutorial

  


  

  • include

    

    • libavcodec

    


    • libavdevice

    


    • libavfilter

    


    • libavformat

    


    • libavutil

    


    • libswresample

    


    • libswscale

    


    


  


  • lib

    

    • pkgconfig

    


    • libavcodec.a

    


    • libavdevice.a

    


    • libavfilter.a

    


    • libformat.a

    


    • libavutil.a

    


    • libswresample.a

    


    • libswscale.a

    


    


  


  • CMakeLists.txt

  


  • main.c

  


  


  CMakeLists.txt

  


  cmake_minimum_required(VERSION 3.20)
project(ffmpeg_tutorial)

set(CMAKE_C_STANDARD 11)

include_directories(include)
link_directories(lib)
add_executable(ffmpeg_tutorial main.cpp)
target_link_libraries(ffmpeg_tutorial
        avformat
        avcodec
        avutil
        swscale
        swresample
        z
        bz2
        iconv
        ws2_32
        schannel
        kernel32
        advapi32
        kernel32
        user32
        gdi32
        winspool
        shell32
        ole32
        oleaut32
        uuid
        comdlg32
        advapi32
        )


  


  main.c

  


  #include 
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswresample/swresample.h"
int main() {
    std::cout << "Hello, World!" << std::endl;
    std::cout << av_version_info() << std::endl;
    printf("ffmpeg version is %s\n", av_version_info());
    // Open input file
    AVFormatContext *inputContext = nullptr;
    if (avformat_open_input(&inputContext, "input.mp3", nullptr, nullptr) != 0) {
        printf("Couldn't open input file\n");
        return -1;
    }

    // Read input stream
    if (avformat_find_stream_info(inputContext, nullptr) < 0) {
        printf("Couldn't find stream information\n");
        return -1;
    }

    // Get audio stream index
    int audioStream = -1;
    for (int i = 0; i < inputContext->nb_streams; i++) {
        if (inputContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
            audioStream = i;
            break;
        }
    }

    if (audioStream == -1) {
        printf("Couldn't find audio stream\n");
        return -1;
    }
}



  


  IDE

  


  clion

  


  ERRORS

  


  [ 50%] Building CXX object CMakeFiles/ffmpeg_tutorial.dir/main.cpp.obj
[100%] Linking CXX executable ffmpeg_tutorial.exe
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavformat.a(tls_schannel.o): in function `tls_write':
D:\Msys64\usr\src\ffmpeg/libavformat/tls_schannel.c:563: undefined reference to `EncryptMessage'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavformat.a(tls_schannel.o): in function `tls_read':
D:\Msys64\usr\src\ffmpeg/libavformat/tls_schannel.c:441: undefined reference to `DecryptMessage'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavcodec.a(mfenc.o):mfenc.c:(.rdata$.refptr.IID_ICodecAPI[.refptr.IID_ICodecAPI]+0x0): undefined reference to `IID_ICodecAPI'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavcodec.a(tiff.o): in function `tiff_uncompress_lzma':
D:\Msys64\usr\src\ffmpeg/libavcodec/tiff.c:577: undefined reference to `lzma_stream_decoder'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavcodec/tiff.c:582: undefined reference to `lzma_code'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavcodec/tiff.c:583: undefined reference to `lzma_end'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: G:/cywen_private/cpp_projects/ffmpeg-tutorial/lib/libavutil.a(random_seed.o): in function `av_get_random_seed':
D:\Msys64\usr\src\ffmpeg/libavutil/random_seed.c:127: undefined reference to `BCryptOpenAlgorithmProvider'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavutil/random_seed.c:130: undefined reference to `BCryptGenRandom'
D:/Msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:\Msys64\usr\src\ffmpeg/libavutil/random_seed.c:131: undefined reference to `BCryptCloseAlgorithmProvider'
collect2.exe: error: ld returned 1 exit status
mingw32-make[3]: *** [CMakeFiles\ffmpeg_tutorial.dir\build.make:95: ffmpeg_tutorial.exe] Error 1
mingw32-make[2]: *** [CMakeFiles\Makefile2:82: CMakeFiles/ffmpeg_tutorial.dir/all] Error 2
mingw32-make[1]: *** [CMakeFiles\Makefile2:89: CMakeFiles/ffmpeg_tutorial.dir/rule] Error 2
mingw32-make: *** [Makefile:123: ffmpeg_tutorial] Error 2


  


  What is the way I compile ffmpeg

  


  


  • downlaod msys2

    


  


  • install mingw64

    


  


  


  pacman -S mingw-w64-x86_64-toolchain


  


  


  • install make,diffutils,nasm,yasm,pkg-config

    


  


  


  pacman -S base-devl yasm nasm pkg-config


  


  


  • download ffmpeg 5.1

    


  


  • compile

    


  


  


  cd ffmpeg
./configure --disable-shared --enable-static --arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- --pkg-config-flags=--static --prefix=../ffmpeg-build

make -j $(nproc)

make install



  


  Project Repoistory

  


  https://github.com/joinwen/learn_ffmpeg.git

  


  Expectation

  


  

  1. How to solve errors

  


  2. In CMakeLists target_link_libraries's parameters is too much, Can I make it short

  


  3. some advices on the project

  


  


• Using FFMPEG in a Visual Studio 2013 ultimate project, linking error LNK2019

  27 mars 2015, par Jokke Ruokolainen

  I’m trying to use FFmpeg library and TIFF lib in my project (I’m making a .dll and/or .exe also). I have searched through the answers provided in here and Google, and linked the /dev/include 64-bit (32-bit VS making 64-bit project) to Additional Include Directories and shared/bin (library files) 64-bit to linker->Additional Library Directories and did the Linker->Additional Depedencies->avformat.lib addition. I also copied the .dll files to my project folder, but I still keep getting the LNK2019. Here’s how I use the libs and the output of the compiler :

  extern "C" {
  
  
  
  #ifndef inline
  
  #define inline __inline
  
  #endif
  
  #ifndef UINT64_C
  
  #define UINT64_C uint64_t
  
  #define INT64_C int64_t
  
  #endif
  
  
  
  #include 
  
  #include 
  
  #include 
  
  
  
  }
  
  #pragma comment(lib, "avformat.lib")
  
  
  
  1>------ Build started: Project: GHSOM_V3, Configuration: FFmpeg x64 ------
  
  1>  ffmpeg_io.cpp
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_malloc referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_free referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_freep referenced in function "void __cdecl aviCloseWriter(struct tagAVIWriter *)" (?aviCloseWriter@@YAXPEAUtagAVIWriter@@@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_rescale_q referenced in function "void __cdecl aviWriteFrame(struct tagAVIWriter *,unsigned char *)" (?aviWriteFrame@@YAXPEAUtagAVIWriter@@PEAE@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_frame_alloc referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_open2 referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_close referenced in function "void __cdecl aviCloseReader(struct tagAVIReader *)" (?aviCloseReader@@YAXPEAUtagAVIReader@@@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_init_packet referenced in function "void __cdecl aviWriteFrame(struct tagAVIWriter *,unsigned char *)" (?aviWriteFrame@@YAXPEAUtagAVIWriter@@PEAE@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol av_free_packet referenced in function "void __cdecl aviReadFrame(struct tagAVIReader *,unsigned char *,int)" (?aviReadFrame@@YAXPEAUtagAVIReader@@PEAEH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_find_decoder referenced in function "void __cdecl initiate_avi_open(struct tagAVIReader *)" (?initiate_avi_open@@YAXPEAUtagAVIReader@@@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_decode_video2 referenced in function "void __cdecl aviReadFrame(struct tagAVIReader *,unsigned char *,int)" (?aviReadFrame@@YAXPEAUtagAVIReader@@PEAEH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_find_encoder referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_find_encoder_by_name referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avcodec_encode_video referenced in function "void __cdecl aviWriteFrame(struct tagAVIWriter *,unsigned char *)" (?aviWriteFrame@@YAXPEAUtagAVIWriter@@PEAE@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avpicture_fill referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol avpicture_get_size referenced in function "struct AVFrame * __cdecl alloc_picture(enum AVPixelFormat,int,int)" (?alloc_picture@@YAPEAUAVFrame@@W4AVPixelFormat@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol sws_getContext referenced in function "void __cdecl initiate_avi_create(struct tagAVIWriter *,int,int)" (?initiate_avi_create@@YAXPEAUtagAVIWriter@@HH@Z)
  
  1>ffmpeg_io.obj : error LNK2019: unresolved external symbol sws_scale referenced in function "void __cdecl aviReadFrame(struct tagAVIReader *,unsigned char *,int)" (?aviReadFrame@@YAXPEAUtagAVIReader@@PEAEH@Z)
  
  1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFClose referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
  
  1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFGetField referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
  
  1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFSetField referenced in function "void __cdecl tiffWriteRGBA(char *,int,int,unsigned char *)" (?tiffWriteRGBA@@YAXPEADHHPEAE@Z)
  
  1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFReadRGBAImage referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
  
  1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFOpen referenced in function "void __cdecl tiffReadRGBA(char *,int *,int *,unsigned char *)" (?tiffReadRGBA@@YAXPEADPEAH1PEAE@Z)
  
  1>tiff_io.obj : error LNK2019: unresolved external symbol TIFFWriteEncodedStrip referenced in function "void __cdecl tiffWriteRGBA(char *,int,int,unsigned char *)" (?tiffWriteRGBA@@YAXPEADHHPEAE@Z)
  
  1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl DCT2d(double *,double *,long,long)" (?DCT2d@@YAXPEAN0JJ@Z) referenced in function "void __cdecl ForwardDCT(class DataShuffle *,unsigned char *,char *,int,int,int,int,int,bool)" (?ForwardDCT@@YAXPEAVDataShuffle@@PEAEPEADHHHHH_N@Z)
  
  1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl IDCT2d(double *,double *,long,long)" (?IDCT2d@@YAXPEAN0JJ@Z) referenced in function "void __cdecl ExportVideoFromDCT(class DataShuffle *,char *,char *,int,int,int,int)" (?ExportVideoFromDCT@@YAXPEAVDataShuffle@@PEAD1HHHH@Z)
  
  1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl CopyToZigZag(double *,double *,long,long,long)" (?CopyToZigZag@@YAXPEAN0JJJ@Z) referenced in function "void __cdecl ForwardDCT(class DataShuffle *,unsigned char *,char *,int,int,int,int,int,bool)" (?ForwardDCT@@YAXPEAVDataShuffle@@PEAEPEADHHHHH_N@Z)
  
  1>Video.obj : error LNK2019: unresolved external symbol "void __cdecl CopyFromZigZag(double *,double *,long,long,long)" (?CopyFromZigZag@@YAXPEAN0JJJ@Z) referenced in function "void __cdecl ExportVideoFromDCT(class DataShuffle *,char *,char *,int,int,int,int)" (?ExportVideoFromDCT@@YAXPEAVDataShuffle@@PEAD1HHHH@Z)