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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (39)
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Encoding and processing into web-friendly formats
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Sur d’autres sites (6671)
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How to link FFmpeg libraries with CMake in windows
4 juillet 2021, par ldall03I'm new to CMake and not very familiar with how linking/compiling works. I am on windows 10 using MinGW in CLion. As the title says I want to use FFmpeg libraries in my c++ code. I downloaded the source code from : https://ffmpeg.org/download.html (Download Source Code button). I unzipped it and put the libavcodec library in my project. Here is my project structure :


project
 \-- cmake-build-debug
 \-- src
 \-- vendor
 \-- libavcodec
 \-- main.cpp
 \--CMakeLists.txt


Here is my main.cpp file :


extern "C" {
#include "libavcodec/avcodec.h"
}

#include <iostream>

int main(int argc, char *argv[]) {
 std::cout << "Hello World\n";
 return 0;
}

</iostream>

And my CMakeLists.txt file :


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)
set(CMAKE_PREFIX_PATH "C:/Qt/6.1.1/mingw81_64/lib/cmake")

find_package(Qt6Widgets REQUIRED)

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_AUTOUIC ON)

add_executable(VidShare main.cpp)
include_directories(src src/vendor)
target_link_libraries(VidShare Qt6::Widgets Qt6::Core Qt6::Gui)


Ignore the Qt stuff it works fine.


And well when I build I get this error message :


fatal error: libavutil/avconfig.h: No such file or directory
 #include "libavutil/avconfig.h"


I've seen that I had to run a configure script in the FFmpeg main file but I'm on windows so I can't really do that. I don't know if I have to use other kinds of libraries or if I downloaded the wrong thing... I am really at lost here. There is probably a better or more convenient way of doing what I want but I could not find many resources on it... Help would be appreciated :)


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Not able to link ffmpeg library in cython package
12 août 2020, par Sagar DonadkarI am using cython package to call Cpp API and in my cpp code i am using ffmpeg library when i try to build my code i got and linking issue
In header file add include ffmpeg header file to call ffmpeg library function


header file
#ifndef RECTANGLE_H
#define RECTANGLE_H
#include <iostream>

extern "C"
{
 #include "libavformat/avformat.h"
 #include "libavutil/dict.h"
}

using namespace std;

namespace shapes 
{
 class Rectangle {
 public:
 int x0, y0, x1, y1;
 Rectangle();
 Rectangle(int x0, int y0, int x1, int y1);
 ~Rectangle();
 int getArea();
 int ffmpegFile();
 void getSize(int* width, int* height);
 void move(int dx, int dy);
 };
}

#endif
</iostream>

Rectangle.Cpp file in ffmpegFile() i am using ffmpeg example code to test ffmpeg my code where i call mostly ffmpeg API



#include <iostream>
#include "Rectangle.hpp"

namespace shapes {
 

 // Default constructor
 Rectangle::Rectangle () {}

 // Overloaded constructor
 Rectangle::Rectangle (int x0, int y0, int x1, int y1) {
 this->x0 = x0;
 this->y0 = y0;
 this->x1 = x1;
 this->y1 = y1;
 }

 // Destructor
 Rectangle::~Rectangle () {}

 // Return the area of the rectangle
 int Rectangle::getArea () {
 return 10;
 }

 // Get the size of the rectangle.
 // Put the size in the pointer args
 void Rectangle::getSize (int *width, int *height) {
 (*width) = x1 - x0;
 (*height) = y1 - y0;
 }

 // Move the rectangle by dx dy
 void Rectangle::move (int dx, int dy) {
 this->x0 += dx;
 this->y0 += dy;
 this->x1 += dx;
 this->y1 += dy;
 }
 int Rectangle::ffmpegFile()
 {
 AVFormatContext *fmt_ctx = NULL;
 AVDictionaryEntry *tag = NULL;
 int ret = 0;
 char* filename = "D:\\Discovery.mp4";

 if ((ret = avformat_open_input(&fmt_ctx, filename, NULL, NULL)))
 return ret;

 if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
 av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
 return ret;
 }

 while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
 printf("%s=%s\n", tag->key, tag->value);

 avformat_close_input(&fmt_ctx);
 return ret;
 }
}
</iostream>

Rectangle.pxd file declaration for cpp file function and variable


cdef extern from "Rectangle.cpp":
 pass
cdef extern from "Rectangle.hpp" namespace "shapes":
 cdef cppclass Rectangle:
 Rectangle() except +
 Rectangle(int, int, int, int) except +
 int x0, y0, x1, y1
 int getArea()
 void getSize(int* width, int* height)
 void move(int, int)
 int ffmpegFile()


rect.pyx file i am calling cpp API form pyx file


# distutils: language = c++

from Rectangle cimport Rectangle

cdef class PyRectangle:
 cdef Rectangle c_rect # Hold a C++ instance which we're wrapping

 def __cinit__(self, int x0, int y0, int x1, int y1):
 self.c_rect = Rectangle(x0, y0, x1, y1)

 def get_area(self):
 return self.c_rect.getArea()

 def get_size(self):
 cdef int width, height
 self.c_rect.getSize(&width, &height)
 return width, height

 def move(self):
 print(self.c_rect.ffmpegFile())


setup.py
I provided pyx file and ffmpeg library path as well as include path


from setuptools import setup,Extension
from Cython.Build import cythonize 


directives={'linetrace':False, 'language_level':3}

setup(name = 'superfastcode', version = '1.0',
 description = 'Python Package with superfastcode C++ extension',
 ext_modules=cythonize([
 Extension(
 'demo',["rect.pyx"],
 include_dirs=['ffmpeg\\include'],)
 library_dirs=["ffmpeg\\lib"],
 libraries=["avcodec","avformat","avutil","swscale","avdevice","avfilter","postproc","swresample"]),
 
]))


getting below error


PS D:\SiVUE\Backend\Cython\demo> python setup.py build_ext --inplace
Compiling rect.pyx because it depends on .\Rectangle.pxd.
[1/1] Cythonizing rect.pyx
C:\python3.8\lib\site-packages\Cython\Compiler\Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: D:\SiVUE\Backend\Cython\demo\rect.pyx
 tree = Parsing.p_module(s, pxd, full_module_name)
running build_ext
building 'demo' extension
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX86\x86\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -I. -Iffmpeg\include -IC:\python3.8\include -IC:\python3.8\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\include" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt" /EHsc /Tprect.cpp /Fobuild\temp.win32-3.8\Release\rect.obj
rect.cpp
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX86\x86\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:ffmpeg\lib /LIBPATH:C:\python3.8\libs /LIBPATH:C:\python3.8\PCbuild\win32 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\lib\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\lib\um\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x86" avcodec.lib avformat.lib avutil.lib swscale.lib avdevice.lib avfilter.lib postproc.lib swresample.lib /EXPORT:PyInit_demo build\temp.win32-3.8\Release\rect.obj /OUT:build\lib.win32-3.8\demo.cp38-win32.pyd /IMPLIB:build\temp.win32-3.8\Release\demo.cp38-win32.lib
 Creating library build\temp.win32-3.8\Release\demo.cp38-win32.lib and object build\temp.win32-3.8\Release\demo.cp38-win32.exp
rect.obj : error LNK2001: unresolved external symbol _avformat_open_input
rect.obj : error LNK2001: unresolved external symbol _av_log
rect.obj : error LNK2001: unresolved external symbol _avformat_close_input
rect.obj : error LNK2001: unresolved external symbol _avformat_find_stream_info
rect.obj : error LNK2001: unresolved external symbol _av_dict_get
build\lib.win32-3.8\demo.cp38-win32.pyd : fatal error LNK1120: 5 unresolved externals
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.26.28801\\bin\\HostX86\\x86\\link.exe' failed with exit status 1120


Thank You


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How to link .so library on Android
9 juin 2014, par SayakiI’m trying to use FFMpeg with Android. First of all I have tryed to build FFMpeg on my Mac but I cant do that. I checked many solution on Internet but none working. Becouse of that I try to build FFMpeg on Ubuntu 12.04. I try a lot of solutions bu finally I found this example and I succeed build it. Then I get headers files and .so files. Then I copy all of them on my mac and try to use it in my project. I copy this files to my project. Now my project tree looks like this :
Here is my Android.mk file :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := avformat
LOCAL_SRC_FILES := libavformat.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include/libavformat
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := ndksetup
LOCAL_SRC_FILES := native.c
LOCAL_LDLIBS := -llog
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
include $(BUILD_SHARED_LIBRARY)Here is my Application.mk file :
APP_MODULES := ndksetup
APP_PLATFORM := android-8
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libavformat.soHere is my natice.c file :
#include
#include
#include <android></android>log.h>
#include "include/libavcodec/avcodec.h"
#include "include/libavformat/avformat.h"
#define DEBUG_TAG "NDKSetupActivity"
void Java_com_example_ndksetup_MainActivity_printLog(JNIEnv *env, jobject this,
jstring logString) {
av_register_all();
jboolean isCopy;
const char * szLogString = (*env)->GetStringUTFChars(env, logString,
&isCopy);
__android_log_print(ANDROID_LOG_DEBUG, DEBUG_TAG, "NDK: %s", szLogString);
(*env)->ReleaseStringUTFChars(env, logString, szLogString);
}
jint Java_com_example_ndksetup_MainActivity_fibonacci(JNIEnv * env,
jobject this, jint value) {
if (value <= 1)
return value;
return Java_com_example_ndksetup_MainActivity_fibonacci(env, this,
value - 1)
+ Java_com_example_ndksetup_MainActivity_fibonacci(env, this,
value - 2);
}I get error
[armeabi] SharedLibrary : libndksetup.so
/Applications/adt-bundle-mac-x86_64-20140321/sdk/ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/michal/Desktop/NDKSetup/obj/local/armeabi/objs/ndksetup/native.o: in function Java_com_example_ndksetup_MainActivity_printLog:/Users/michal/Desktop/NDKSetup/jni/native.c:11: error: undefined reference to 'av_register_all'
collect2: ld returned 1 exit status
make: *** [/Users/michal/Desktop/NDKSetup/obj/local/armeabi/libndksetup.so] Error 1And I really dont know how to deal with it. Can you tell me what Im dooing wrong and how can I fix it ? Or maybe there is another way to use .so library in Android
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