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• arm-linux-androideabi-gcc is unable to create an executable - compile ffmpeg for android armeabi devices

  6 décembre 2015, par Chaitanya Chandurkar

  I am trying to compile ffmpeg for android armeabi devices.
  I am following tutorial by roman10.net
  His given build script builds ffmpeg for armv7-a devices. I want to build it for armeabi.
  

  My ultimate aim is to run ffmpeg commands on android armeabi and armv7-a devices.

  So I change the script’s CPU part from

  #arm v7vfpv3
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  PREFIX=./android/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one 

  to

  #arm v6
  
  CPU=armv6
  
  OPTIMIZE_CFLAGS="-marm -march=$CPU"
  
  PREFIX=./android/$CPU 
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one

  (I thought changing it to armv6 would build ffmpeg compatible with armeabi devices. m I wrong ?)

  Doubt 1 :
  Do I also have to change toolchain ?
  i.e from arm-linux-androideabi-4.4.3 to arm-eabi-4.4.0 ?????

  Doubt 2 :

  When I try running ./build.sh (without changing toolchain) it gives me following error :
  

  /home/chaitanya/android/android-ndk-r5b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
  If you think configure made a mistake,.. blaah blahh blaah

  after that I got lot of warnings saying :
  ‘sub_id’ is deprecated and many other function deprecated warnings.

  platform : ubuntu 11.10
  ffmpeg version : 0.11.2
  NDK : android-ndk-r5b

  Here is my build script :

  #!/bin/bash
  
  ######################################################
  
  # Usage:
  
  # put this script in top of FFmpeg source tree
  
  # ./build_android
  
  # It generates binary for following architectures:
  
  # ARMv6 
  
  # ARMv6+VFP 
  
  # ARMv7+VFM-ïd16 (Tegra2) 
  
  # ARMv7+Neon (Cortex-A8)
  
  # Customizing:
  
  # 1. Feel free to change ./configure parameters for more features
  
  # 2. To adapt other ARM variants
  
  # set $CPU and $OPTIMIZE_CFLAGS 
  
  # call build_one
  
  ######################################################
  
  NDK=~/android/android-ndk-r5b
  
  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  function build_one
  
  {
  
  ./configure --target-os=linux \
  
      --prefix=$PREFIX \
  
      --enable-cross-compile \
  
      --extra-libs="-lgcc" \
  
      --arch=arm \
  
      #--cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
      --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
      #--nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
      --sysroot=$PLATFORM \
  
      --extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
  
      --disable-shared \
  
      --enable-static \
  
      --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
      --disable-everything \
  
      --enable-demuxer=mov \
  
      --enable-demuxer=h264 \
  
      --disable-ffplay \
  
      --enable-protocol=file \
  
      --enable-avformat \
  
      --enable-avcodec \
  
      --enable-decoder=rawvideo \
  
      --enable-decoder=mjpeg \
  
      --enable-decoder=h263 \
  
      --enable-decoder=mpeg4 \
  
      --enable-decoder=h264 \
  
      --enable-parser=h264 \
  
      --disable-network \
  
      --enable-zlib \
  
      --disable-avfilter \
  
      --disable-avdevice \
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  
  
  make clean
  
  make  -j4 install
  
  $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
  
  }
  
  
  
  #arm v6
  
  CPU=armv6
  
  OPTIMIZE_CFLAGS="-marm -march=$CPU"
  
  PREFIX=./android/$CPU 
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one
  
  
  
  #arm v7vfpv3
  
  #CPU=armv7-a
  
  #OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  #PREFIX=./android/$CPU
  
  #ADDITIONAL_CONFIGURE_FLAG=
  
  #build_one
  
  
  
  #arm v7vfp
  
  #CPU=armv7-a
  
  #OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
  
  #PREFIX=./android/$CPU-vfp
  
  #ADDITIONAL_CONFIGURE_FLAG=
  
  #build_one
  
  
  
  #arm v7n
  
  #CPU=armv7-a
  
  #OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mtune=cortex-a8"
  
  #PREFIX=./android/$CPU 
  
  #ADDITIONAL_CONFIGURE_FLAG=--enable-neon
  
  #build_one
  
  
  
  #arm v6+vfp
  
  #CPU=armv6
  
  #OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP -mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU"
  
  #PREFIX=./android/${CPU}_vfp 
  
  #ADDITIONAL_CONFIGURE_FLAG=
  
  #build_one

  How do I tackle this problem ? what is going wrong ?

• linphone on windows building error

  21 novembre 2013, par chhameed

  i have downloaded the linphone for Android from Github.
  i have also followed all the instructions in readme file. the problem is that when i run ndk-build command it produce below error .

  Android NDK: ERROR:jni/..//submodules/externals/build/ffmpeg/Android.mk:avutil-linphone: LOCAL_SRC_FILES points to a missing file
  
  Android NDK: Check that jni/..//submodules/externals/build/ffmpeg/arm/libavutil/libavutil-linphone-arm.so exists  or that its path is correct
  
  /cygdrive/c/development/android-ndk-r9b/build/core/prebuilt-library.mk:45: *** Android NDK: Aborting    .  Stop.

  what this error mean ? & how can i resolve this? i already spent many hours to searchout this error but no success...
  my OS is window 7 & i used cygwin for commands.

  i have found same question on SO
  Android NDK error when using FFmpeg in Android ?

  it says Basically problem was with ffmpeg lib.I was not able to compile ffmpeg lib on Windows 7. I switched to Ubuntu & tried AppUnite & after spending so many hours it was working.

  is it not possible to build linphone on windows ??? 

• Appending Video Stream to Existing or New File Using FFmpeg

  10 septembre 2013, par petre

  I can record 320x240 5-fps h264-encoded grayscale stream from internal webcam of my laptop to avi file. Beside this function, i can manage to extract a grayscale jpeg file every 5 seconds.

  I do want to record from webcam to file cumulatively to the file. If file (output avi) exists, script should append stream to end of file. If file does not exist, script should create file and then write.

  My code (script) overwrites the existing file, not appends to the end of file.

  How can i achieve this functionality ?

  Here is my design :

  ffmpeg -f video4linux2 -i /dev/video0 -c:v libx264 -r 5 -s 320x240 -vf format=gray /home/aydu/Desktop/demo/cam0.avi -r 1/5 -vf format=gray -f image2 -updatefirst 1 /home/aydu/Desktop/demo/image.jpeg