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How to build FFMPEG lib with android ndk

27 janvier 2017, par S. Le Galloudec

I introduce my problem : I’m a student working on a project asked by a company to my school.
My part is to develop an android application (i have to use c++) who can make an authentication, ask to an api wich camera the client can watch, then display in real time the stream of the IP camera (using RTSP protocol)

To be honnest i’m pretty lost. I’ve found the library FFMPEG, wich looks like useful to my project. If i got it right, the library can display a stream from a camera. So i built the library for my project, and then i tried to include it in my program.

I did it the same way i did to include the library curl that i already use.

But when i try to run my program, i got this message :

FAILURE : Build failed with an exception.

What went wrong :
Execution failed for task ’:app:externalNativeBuildDebug’.
Build command failed.
Error while executing ’/local/Android/Sdk/cmake/3.6.3155560/bin/cmake’ with arguments —build /local/Bureau/Projet2/videosurveillance/Application_Android/App_Android/app/.externalNativeBuild/cmake/debug/x86 —target lecteur
[1/1] Linking CXX shared library ../obj/x86/liblecteur.so
FAILED : : && /local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -target i686-none-linux-android -gcc-toolchain /local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 —sysroot=/local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,—noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -std=gnu++11 -O0 -fno-limit-debug-info -Wl,—build-id -Wl,—warn-shared-textrel -Wl,—fatal-warnings -Wl,—no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,liblecteur.so -o ../obj/x86/liblecteur.so CMakeFiles/lecteur.dir/src/main/cpp/lecteur.cpp.o ../../../../../distribution/ffmpeg/x86/lib/libswscale.a -lz /local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86/usr/lib/liblog.so -lm "/local/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && :
/local/Bureau/Projet2/videosurveillance/Application_Android/App_Android/app/src/main/cpp/lecteur.cpp:19 : error : undefined reference to ’avcodec_configuration’
clang++ : error : linker command failed with exit code 1 (use -v to see invocation)
ninja : build stopped : subcommand failed.

Try :
Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output.

And i know that the problem comes from my cmakelist, or from my tree. But i don’t see the mistake, so if you could help me. Here is my cmakelist :

cmake_minimum_required(VERSION 3.4.1)



set(distribution_DIR ${CMAKE_SOURCE_DIR}/../distribution)





add_library(lib-curl STATIC IMPORTED)



add_library(ffmpeg SHARED IMPORTED)



set_target_properties(lib-curl PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/curl/lib/${ANDROID_ABI}/libcurl.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavcodec.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavdevice.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavfilter.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavformat.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavutil.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libpostproc.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswresample.a)



set_target_properties(ffmpeg PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswscale.a)









set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")





add_library( # Sets the name of the library.

         downloader

         SHARED

         src/main/cpp/downloader.cpp

          #src/main/cpp/downloader.h

          )





add_library( # Sets the name of the library.

         getrequest

         SHARED

         src/main/cpp/getrequest.cpp

          #src/main/cpp/getrequest.h

          )



add_library( # Sets the name of the library.

         lecteur

         SHARED

         src/main/cpp/lecteur.cpp

          #src/main/cpp/lecteur.h

          )



target_include_directories(downloader PRIVATE

                       ${distribution_DIR}/curl/include)



target_include_directories(getrequest PRIVATE

                       ${distribution_DIR}/curl/include)



target_include_directories(lecteur PRIVATE

                       ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/include)





find_library( # Sets the name of the path variable.

          log-lib



          log )



target_link_libraries( # Specifies the target library.

                   downloader

                   lib-curl

                   z

                   ${log-lib}

                   )



target_link_libraries( # Specifies the target library.

                   getrequest

                   lib-curl

                   z

                   ${log-lib}

                   )



target_link_libraries( # Specifies the target library.

                   lecteur

                   ffmpeg

                   z

                   ${log-lib}

                   )

If you want to understand how i made my cmake, and what looks like my program you can check here : https://github.com/samylegalloudec/android-ndk-ffmepg

Hope i was clear

Best regards

Edit n°1 :

I think i’ve made a mistake in my cmakelist.txt so i fixed it (i guess) this way :

cmake_minimum_required(VERSION 3.4.1)



set(distribution_DIR ${CMAKE_SOURCE_DIR}/../distribution)





add_library(lib-curl STATIC IMPORTED)







set_target_properties(lib-curl PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/curl/lib/${ANDROID_ABI}/libcurl.a)



add_library(ffmpeg-codec STATIC IMPORTED)

set_target_properties(ffmpeg-codec PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavcodec.a)



add_library(ffmpeg-device STATIC IMPORTED)

set_target_properties(ffmpeg-device PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavdevice.a)



add_library(ffmpeg-filter STATIC IMPORTED)

set_target_properties(ffmpeg-filter PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavfilter.a)



add_library(ffmpeg-format STATIC IMPORTED)

set_target_properties(ffmpeg-format PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavformat.a)



add_library(ffmpeg-util STATIC IMPORTED)

set_target_properties(ffmpeg-util PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libavutil.a)



add_library(ffmpeg-postproc STATIC IMPORTED)

set_target_properties(ffmpeg-postproc PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libpostproc.a)



add_library(ffmpeg-sample STATIC IMPORTED)

set_target_properties(ffmpeg-sample PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswresample.a)



add_library(ffmpeg-scale STATIC IMPORTED)

set_target_properties(ffmpeg-scale PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/lib/libswscale.a)









set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")





add_library( # Sets the name of the library.

         downloader

         SHARED

         src/main/cpp/downloader.cpp

          #src/main/cpp/downloader.h

          )





add_library( # Sets the name of the library.

         getrequest

         SHARED

         src/main/cpp/getrequest.cpp

          #src/main/cpp/getrequest.h

          )



add_library( # Sets the name of the library.

         lecteur

         SHARED

         src/main/cpp/lecteur.cpp

          #src/main/cpp/lecteur.h

          )



target_include_directories(downloader PRIVATE

                       ${distribution_DIR}/curl/include)



target_include_directories(getrequest PRIVATE

                       ${distribution_DIR}/curl/include)



target_include_directories(lecteur PRIVATE

                       ${distribution_DIR}/ffmpeg/${ANDROID_ABI}/include)





find_library( # Sets the name of the path variable.

          log-lib



          log )



target_link_libraries( # Specifies the target library.

                   downloader

                   lib-curl

                   z

                   ${log-lib}

                   )



target_link_libraries( # Specifies the target library.

                   getrequest

                   lib-curl

                   z

                   ${log-lib}

                   )



target_link_libraries( # Specifies the target library.

                   lecteur

                   ffmpeg-codec

                   ffmpeg-device

                   ffmpeg-filter

                   ffmpeg-format

                   ffmpeg-util

                   ffmpeg-postproc

                   ffmpeg-sample

                   ffmpeg-scale

                   z

                   ${log-lib}

                   )

Now i have another message :

FAILURE : Build failed with an exception.

What went wrong :
Execution failed for task ’:app:externalNativeBuildDebug’.
Build command failed.
Error while executing ’/local/Android/Sdk/cmake/3.6.3155560/bin/cmake’ with arguments —build /local/Bureau/Projet2/videosurveillance/Application_Android/App_Android/app/.externalNativeBuild/cmake/debug/x86 —target lecteur
[1/1] Linking CXX shared library ../obj/x86/liblecteur.so
FAILED : : && /local/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ -target i686-none-linux-android -gcc-toolchain /local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 —sysroot=/local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,—noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -std=gnu++11 -O0 -fno-limit-debug-info -Wl,—build-id -Wl,—warn-shared-textrel -Wl,—fatal-warnings -Wl,—no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,liblecteur.so -o ../obj/x86/liblecteur.so CMakeFiles/lecteur.dir/src/main/cpp/lecteur.cpp.o ../../../../../distribution/ffmpeg/x86/lib/libavcodec.a ../../../../../distribution/ffmpeg/x86/lib/libavdevice.a ../../../../../distribution/ffmpeg/x86/lib/libavfilter.a ../../../../../distribution/ffmpeg/x86/lib/libavformat.a ../../../../../distribution/ffmpeg/x86/lib/libavutil.a ../../../../../distribution/ffmpeg/x86/lib/libpostproc.a ../../../../../distribution/ffmpeg/x86/lib/libswresample.a ../../../../../distribution/ffmpeg/x86/lib/libswscale.a -lz /local/Android/Sdk/ndk-bundle/platforms/android-9/arch-x86/usr/lib/liblog.so -lm "/local/Android/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && :
/local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld : warning : shared library text segment is not shareable
/local/Android/Sdk/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld : error : treating warnings as errors
clang++ : error : linker command failed with exit code 1 (use -v to see invocation)
ninja : build stopped : subcommand failed.

Try :
Run with —stacktrace option to get the stack trace. Run with —info or —debug option to get more log output.

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Librairies et logiciels spécifiques aux médias

HTML5 audio and video support

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How to build FFMPEG lib with android ndk

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