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• x264 Building error - Android

  21 avril 2016, par Jay Parikh

  I am using this repository to build ffmpeg static library which includes x264,libpng and others, please
  visit this link https://github.com/writingminds/ffmpeg-android

  i am using windows 7 as host and ubuntu 15.10 (_64) as guest os using VMware Workstation 12
  and
  Android-ndk-r11b-linux-x86_64

  i do have Prebuilt libraries , but now i want it without PIE support

  i am getting this error in config.log in x264 folder while building
  through

  ./android_build.sh

  here is the log :

  x264 configure script
  
  Command line options: "--cross-prefix=/mnt/hgfs/uShare/ffmpeg-android/toolchain-android/bin/arm-linux 
  
  /mnt/hgfs/uShare/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-gcc 
  
  
  
  checking whether /mnt/hgfs/uShare/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi-gcc 
  
  
  
  --sysroot=/mnt/hgfs/uShare/ffmpeg-android/toolchain-android/sysroot works... no
  
  
  
   Failed commandline was:
  
  
  
  --sysroot=/mnt/hgfs/uShare/ffmpeg-android/toolchain-android/sysroot conftest.c  -Wall -I. -I$(SRCPATH) --sysroot=/mnt/hgfs/uShare/ffmpeg-android/toolchain-android/sysroot    --sysroot=/mnt/hgfs/uShare/ffmpeg-android/toolchain-android/sysroot -lm -o conftest
  
  
  
  /mnt/hgfs/uShare/ffmpeg-android/toolchain-android/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: fatal error:
  
  
  
  conftest: Input/output error
  
  
  
  Failed program was: 
  
  
  
  int main (void) {  return 0; }
  
  
  
  DIED: No working C compiler found.

  ushare is my shared folder between windows and ubuntu

  I have spend almost a week ,trying to solve every error i get.
  these errors are like never ending , 1 solution give 10 more errors
  i have researched a LOT for this library

  thanks a lot in advance.

  Also i thought that x264 library might have poroblem ,so i tried to disable it
  but next library "libpng" also had Same log Error

  i think problem is in Input/output error (obviously)
  this line in log kind of confuses me (those /../../)

  /mnt/hgfs/uShare/ffmpeg-android/toolchain-android/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld : fatal error :

  its like two folder overlaping address...

  thanks a lot in advance.
  please don’t go harsh on me ,its my first time,all thanks to this thing...

• FFMPEG multi livestream - recorded stream send to different services like YT and Twitch at different time (on different button clicks )

  4 octobre 2022, par Ganesh

  Trying for the last 10 days and still no success, I am creating a python application that will accept the URL and visit that URL using chromium, capture that screen and send that real-time screen recording to different live stream acceptors as youtube live, twitch Twitter, Facebook live or some other sources and many of these could be multiple.

  


  There are two challenges (both challenges depend on a user action like different button clicks) -

  


  

  • The time of starting the Livestream we know only one Livestream acceptor and other acceptors could be sent via another API at any time or may not be sent on the whole live stream.

  


  • Any of the streams could be stopped at any moment including the first one which started the original live streaming service

  


  


  To Solve these challenges I am trying the following process (i took mp4 as a source for simplifying)

  


  

  • create a stream and store it into PIPE.stdout

  


  


  ffmpeg_Command_get_stream = 'ffmpeg -re -i test.mp4 -f flv pipe:1'
ffmpeg_Command_get_stream=ffmpeg_Command_get_stream.split()
pipe = sp.Popen(ffmpeg_Command_get_stream,
            stdout=sp.PIPE,
            stderr=sp.PIPE,
            bufsize=8000000,
            shell=True,
            universal_newlines=True
            )
out,err = pipe.communicate()


  


  


  • and send that stream with the help of FFMPEG to the Livestream acceptor with the click of the youtube Livestream button

    


    ffmpeg_Command_send_stream = ['ffmpeg','-i',pipe.stdout,'-f','flv',RTMPURL_YOUTUBE]

    


  


  


  Update Trying to Explain it a little more :

  


  step 1 - I need a real-time stream from the first command, so I used -re in FFMPEG

  


  step 2 - Use above stream as an input for other command and send that as an output as a Livestream to youtube (or twitch/Facebook), But the second step would happen only when the user click on the button "YT LiveStream", Here the tricky thing is there are multiple buttons (YT LiveStream, Twitch LiveStream, Facebook LiveStream) and user can click any time on any of button, also can click on all button one by one.

  


  

  


  sorry for bad explaination

  


  what I am doing wrong ? , Is this Possible ? or need to go with another process,

  


  any help would be greatly appreciated

  


• Integrating FFMPEG using cmake : undefined reference when linking libraries

  21 novembre 2018, par Hamed Momeni

  I’ve been trying to cross-compile ffmpeg for different Android cpu archs for couple of days now and I have finally succeeded in the task. But now that I need to integrate these pre-built .so files in my project I’m facing errors which have me baffled.

  This is the CMakeLists.txt which I’m using :

  cmake_minimum_required(VERSION 3.4.1)
  
  
  
  # convert SDK path to forward slashes on Windows
  
  file(TO_CMAKE_PATH ${PATH_TO_SUPERPOWERED} PATH_TO_SUPERPOWERED)
  
  
  
  set(CMAKE_VERBOSE_MAKEFILE on)
  
  
  
  include_directories(src/main/cpp)
  
  include_directories(${PATH_TO_SUPERPOWERED})
  
  include_directories(${PATH_TO_FFMPEG}/${ANDROID_ABI}/include)
  
  
  
  add_library(
  
          avutil
  
          SHARED
  
          ${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavutil.so
  
  )
  
  set_target_properties(avutil PROPERTIES LINKER_LANGUAGE CXX)
  
  
  
  add_library(
  
          avformat
  
          SHARED
  
          ${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavformat.so
  
  )
  
  set_target_properties(avformat PROPERTIES LINKER_LANGUAGE CXX)
  
  
  
  add_library(
  
          avcodec
  
          SHARED
  
          ${PATH_TO_FFMPEG}/${ANDROID_ABI}/lib/libavcodec.so
  
  )
  
  set_target_properties(avcodec PROPERTIES LINKER_LANGUAGE CXX)
  
  
  
  
  
  
  
  add_library(
  
          Canto
  
          SHARED
  
          src/main/cpp/Dubsmash.cpp
  
          src/main/cpp/Karaoke.cpp
  
          src/main/cpp/Singing.cpp
  
          src/main/cpp/EditDubsmash.cpp
  
          ${PATH_TO_SUPERPOWERED}/AndroidIO/SuperpoweredAndroidAudioIO.cpp
  
  )
  
  
  
  # link the native library against the following libraries
  
  target_link_libraries(
  
          Canto
  
          avutil
  
          avformat
  
          avcodec
  
          ${PATH_TO_SUPERPOWERED}/libSuperpoweredAndroid${ANDROID_ABI}.a
  
          OpenSLES
  
          log
  
          android
  
  )

  And this is the source of the file I’m getting errors on :

  #include 
  
  #include <android></android>log.h>
  
  #include <string>
  
  // unrelated includes
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavutil></libavutil>dict.h>
  
  
  
  #define log_write __android_log_write
  
  #define log_print __android_log_print
  
  
  
  // unrelated code parts
  
  
  
  int print_file_data(const char *filePath) {
  
      AVFormatContext *fmt_ctx = NULL;
  
      AVDictionaryEntry *tag = NULL;
  
      int ret;
  
  
  
      if ((ret = avformat_open_input(&amp;fmt_ctx, filePath, NULL, NULL)))
  
          return ret;
  
  
  
      while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
  
          log_print(ANDROID_LOG_DEBUG, "%s=%s\n", tag->key, tag->value);
  
  
  
      avformat_close_input(&amp;fmt_ctx);
  
      return 0;
  
  }
  
  </string>

  And finally the errors themselves :

  FAILURE: Build failed with an exception.
  
  
  
  * What went wrong:
  
  Execution failed for task ':app:externalNativeBuildDebug'.
  
  > Build command failed.
  
    Error while executing process /home/hamed/dev/android-tools/android-sdk-linux/cmake/3.6.4111459/bin/cmake with arguments {--build /home/hamed/dev/projects/canto/Canto/app/.externalNativeBuild/cmake/debug/x86 --target Canto}
  
    [1/1] Linking CXX shared library ../../../../build/intermediates/cmake/debug/obj/x86/libCanto.so
  
    FAILED: : && /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++  --target=i686-none-linux-android16 --gcc-toolchain=/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 --sysroot=/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sysroot -fPIC -isystem /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sysroot/usr/include/i686-linux-android -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -fsigned-char -I/home/hamed/dev/projects/canto/Canto/app/../Superpowered -I/home/hamed/dev/projects/canto/Canto/app/../ffmpeg -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/platforms/android-16/arch-x86 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -L/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86 -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libCanto.so -o ../../../../build/intermediates/cmake/debug/obj/x86/libCanto.so CMakeFiles/Canto.dir/src/main/cpp/Dubsmash.cpp.o CMakeFiles/Canto.dir/src/main/cpp/Karaoke.cpp.o CMakeFiles/Canto.dir/src/main/cpp/Singing.cpp.o CMakeFiles/Canto.dir/src/main/cpp/EditDubsmash.cpp.o CMakeFiles/Canto.dir/home/hamed/dev/projects/canto/Canto/Superpowered/AndroidIO/SuperpoweredAndroidAudioIO.cpp.o  ../../../../build/intermediates/cmake/debug/obj/x86/libavutil.so ../../../../build/intermediates/cmake/debug/obj/x86/libavformat.so ../../../../../Superpowered/libSuperpoweredAndroidx86.a -lOpenSLES -llog -landroid -latomic -lm "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++_static.a" "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++abi.a" "/home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libandroid_support.a" && :
  
    /home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:295: error: undefined reference to 'avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)'
  
    /home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:298: error: undefined reference to 'av_dict_get(AVDictionary const*, char const*, AVDictionaryEntry const*, int)'
  
    /home/hamed/dev/projects/canto/Canto/app/src/main/cpp/Dubsmash.cpp:301: error: undefined reference to 'avformat_close_input(AVFormatContext**)'
  
    clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
    ninja: build stopped: subcommand failed.

  Obviously the linker can not find the needed libraries, but why ?!

  UPDATE
  This is the result of running nm on libavutil.so :

  0000000000000510 t atexit
  
  0000000000000500 t __atexit_handler_wrapper
  
  0000000000002008 A __bss_start
  
                   U __cxa_atexit
  
                   U __cxa_finalize
  
  0000000000002000 d __dso_handle
  
  0000000000001dd8 d _DYNAMIC
  
  0000000000002008 A _edata
  
  00000000000004e0 t __emutls_unregister_key
  
  0000000000002008 A _end
  
  00000000000005e8 r __FRAME_END__
  
  0000000000001fd8 d _GLOBAL_OFFSET_TABLE_
  
  0000000000000258 r ndk_build_number
  
  0000000000000218 r ndk_version
  
  0000000000000200 r note_android_ident
  
  0000000000000214 r note_data
  
  0000000000000298 r note_end
  
  000000000000020c r note_name
  
  00000000000004d0 t __on_dlclose
  
  00000000000004f0 t __on_dlclose_late

  and on libavformat :

  0000000000000520 t atexit
  
  0000000000000510 t __atexit_handler_wrapper
  
  0000000000002008 A __bss_start
  
                   U __cxa_atexit
  
                   U __cxa_finalize
  
  0000000000002000 d __dso_handle
  
  0000000000001dd8 d _DYNAMIC
  
  0000000000002008 A _edata
  
  00000000000004f0 t __emutls_unregister_key
  
  0000000000002008 A _end
  
  00000000000005f8 r __FRAME_END__
  
  0000000000001fd8 d _GLOBAL_OFFSET_TABLE_
  
  0000000000000258 r ndk_build_number
  
  0000000000000218 r ndk_version
  
  0000000000000200 r note_android_ident
  
  0000000000000214 r note_data
  
  0000000000000298 r note_end
  
  000000000000020c r note_name
  
  00000000000004e0 t __on_dlclose
  
  0000000000000500 t __on_dlclose_late

  UPDATE 2
  I applied @szatmary suggestion and finally managed to to build the apk file but upon reaching the System.loadLibrary call an exception occurs indicating that the linker can not find libavutil.so.56. I tried changing the address of the library in the cmake file to actually contain the version numbered lib file to no avail :

  java.lang.UnsatisfiedLinkError: dlopen failed: library "libavutil.so.56" not found
  
          at java.lang.Runtime.loadLibrary0(Runtime.java:1016)
  
          at java.lang.System.loadLibrary(System.java:1657)
  
          at com.hmomeni.canto.activities.EditActivity.<init>(EditActivity.kt:26)
  
          at java.lang.Class.newInstance(Native Method)
  
          at android.app.Instrumentation.newActivity(Instrumentation.java:1174)
  
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2669)
  
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
  
          at android.app.ActivityThread.-wrap11(Unknown Source:0)
  
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
  
          at android.os.Handler.dispatchMessage(Handler.java:106)
  
          at android.os.Looper.loop(Looper.java:164)
  
          at android.app.ActivityThread.main(ActivityThread.java:6494)
  
          at java.lang.reflect.Method.invoke(Native Method)
  
          at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
  
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
  
  </init>