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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.

• play MPD file of mpeg-dash on android and IOS

  8 février 2017, par user3223551

  I have used ffmpeg to create a MPD file for my video, and I could play and watch it on my pc using :http://dashplayer.azurewebsites.net/

  now I want to make sure it works and plays appropriately on andoid and IOS, could anyone tell me how to test this file on android and IOS ?

• Webrtc to rtmp using ffmpeg for live streaming from webcam to browsers and mobile

  6 février 2017, par Omar Suleiman

  I am new in live streaming, and i am working on the website to allows user to broadcasting and visitors can watch and listen the video, I use webrtc from webcam and the url is blob, so I can not find the best way to transcode webrtc to rtmp or hls to show the live streaming in the browsers as a flash and on mobile as hls. I dont know from where can i start.

  what is the best way for transcoding (ffmpeg or red5 or nginx or what) - like : 1 broadcaster to 1000 viewers can watch and listen and there is many broadcasters also.

  what about CPU usage.

  I am used asp.net MVC

  your help is very appreciated.
  Thanks.