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• Compile error for a simple library in Android using latest FFmpeg library with NDK

  21 mars 2017, par satyres

  I’m trying to get FFmpeg working in Android , and after successfuly compiled it on Ubuntu 64bit , and created the Android.mk under source/ffmpeg-3.4.2/android/arm folder and also the Android.mk in my own Android project
   ! i’m unable to compile a simple program and create the .so file !
  By the way i’ve searched over the net and in Stackoverflow for 2 days now without luck !
  here is the code Android.mk

  LOCAL_PATH:= $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := MyLibrary
  
  LOCAL_SRC_FILES := MyNativeFunctions.c
  
  LOCAL_LDLIBS := -lz -llog
  
  LOCAL_STATIC_LIBRARIES := libavformat_static libavcodec_static libavutil_static
  
  include $(BUILD_SHARED_LIBRARY)
  
  
  
  $(call import-module,ffmpeg-3.2.4/android/arm)

  The native functions

      #include <libavformat></libavformat>avformat.h>
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavutil></libavutil>avutil.h>
  
  
  
      #include <android></android>log.h>
  
      #define LOG_TAG "mylib"
  
      #define LOGI(...)  __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
  
      #define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
  
      jint Java_com_example_home_hellondk_MyNativeFunctions_TestNdk(JNIEnv * env, jobject this, jstring filename)
  
      {
  
           av_register_all();
  
  
  
  return 0;
  
  }

  when i use NDK-BUILD here is the error i got :

  /home/home/Android/Sdk/ndk-bundle/sources/ffmpeg-3.2.4/android/arm/lib/libavformat.a: error adding symbols: File in wrong format
  
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
  make: *** [obj/local/arm64-v8a/libMyLibrary.so] Error 1

  [EDIT]
  Build_android.sh

  #!/bin/bash
  
  NDK=/home/home/Android/Sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-24/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
   function build_one
  
  {
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --disable-shared \
  
  --enable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-avdevice \
  
  --disable-doc \
  
  --disable-symver \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  --extra-ldflags="$ADDI_LDFLAGS" \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  [EDIT]
  The problem has been solved by adding the missing library in
  LOCAL_STATIC_LIBRARIES := libavformat_static libavcodec_static libswscale_static libavutil_static libswresample_static
  and for all users of Android Studio do not forget to add this line to your gradle otherwise it won’t work.

  sourceSets.main {
  
          jni.srcDirs = []
  
          jniLibs.srcDir 'src/main/libs'
  
      }

  Best regards

• Undefined symbols av_register_all()

  8 mai 2018, par JaSHin

  Good day,

  I am beginner in Objective-C and Xcode IDE. I am trying use ffmpeg in my iOS application. I cloned https://github.com/kewlbear/FFmpeg-iOS-build-script and build for arm64 and x86_64.

  When I wanted to build app it crashed with

  Ld /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator/CPP3.app/CPP3 normal x86_64
  
  cd /Volumes/sedy/xcode/CPP3
  
  export IPHONEOS_DEPLOYMENT_TARGET=9.1
  
  export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
  
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.1.sdk -L/Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator -L/Volumes/sedy/xcode/CPP3/CPP3/ffmpeg/lib -F/Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator -filelist /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Intermediates/CPP3.build/Debug-iphonesimulator/CPP3.build/Objects-normal/x86_64/CPP3.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -mios-simulator-version-min=9.1 -Xlinker -objc_abi_version -Xlinker 2 -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -lavcodec -lavdevice -lavfilter -lavformat -lavutil -lswresample -lswscale -framework AVFoundation -liconv -lbz2 -Xlinker -dependency_info -Xlinker /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Intermediates/CPP3.build/Debug-iphonesimulator/CPP3.build/Objects-normal/x86_64/CPP3_dependency_info.dat -o /Users/nikolajpognerebko/Library/Developer/Xcode/DerivedData/CPP3-eowdhpsbeagmxydsrsscofhtuwtl/Build/Products/Debug-iphonesimulator/CPP3.app/CPP3
  
  
  
  Undefined symbols for architecture x86_64:
  
    "av_register_all()", referenced from:
  
        Decoder::Decoder() in ViewController.o
  
  ld: symbol(s) not found for architecture x86_64
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

  There is zipped project on OneDrive http://1drv.ms/1KkPAia because it is a best way to explain my problem.

  Please help me and explain, what this problem arose.

  Thanks very much.

• Unable to use concat in stripped down version of ffmpeg

  29 juillet 2020, par Amit Bhandari

  I have compiled ffmpeg for my android app to have only essential components. I have enabled following components.

  


  --disable-everything \
--enable-demuxer=concat \
--enable-muxer=concat,mp4 \
--enable-protocol=file,subfile \
--enable-filter=amix,adelay,volume \


  


  But when I am trying to concatenate mp4 files using following command

  


  ffmpeg -y -f concat -safe 0 -i files.txt -c copy output.mp4


  


  I am receiving following error

  


  [concat @ 0x7bd7d14400] Impossible to open 'file1.mp4'
files.txt: Invalid data found when processing input


  


  Here is complete ffmpeg output for reference

  


      Command execution failed with rc=1 and the output below.
Command execution failed ffmpeg version v4.3-dev-2955 Copyright (c) 2000-2020 the FFmpeg developers
      built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
      configuration: --cross-prefix=aarch64-linux-android- --sysroot=/home/amit/Android/Sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/amit/work/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android21-clang --cxx=aarch64-linux-android21-clang++ --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --disable-openssl --disable-xmm-clobber-test --enable-debug --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --d  libavutil      56. 42.102 / 56. 42.102
      libavcodec     58. 78.102 / 58. 78.102
      libavformat    58. 42.100 / 58. 42.100
      libavdevice    58.  9.103 / 58.  9.103
      libavfilter     7. 77.101 /  7. 77.101
      libswscale      5.  6.101 /  5.  6.101
      libswresample   3.  6.100 /  3.  6.100
    [concat @ 0x7bd7d14400] Impossible to open 'absolute path here/1.mp4'
    absolute path here/files.txt: Invalid data found when processing input
Command execution 7


  


  Exact same command works when I compile complete ffmpeg. What components I might be missing for getting this error ? Help is appreciated.