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• libx264 encoder error in ffmpeg android build

  26 décembre 2013, par kerim yucel

  Right now, I have a ffmeg build script which recognizes libx264 and compiles succesfully. I have also compiled x264 and obtained libx264.a library. Both ffmpeg and libx264 are built from source. I can build ffmpeg without libx264 succesfully as well. Below you may find my script which tries to build ffmpeg with libx264.

  #!/bin/bash
  
  NDK=~/Android_NDK_r7b
  
  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  alitan=~/x264/ndk7_build
  
  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=" -I$alitan/include" \
  
  --disable-shared \
  
  --enable-static \
  
  --extra-ldflags=" -L$alitan/lib " \
  
  --enable-version3 \
  
  --enable-gpl \
  
  --disable-doc \
  
  --disable-everything \
  
  --enable-libx264 \
  
  --enable-encoder=libx264 \
  
  $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 v7vfpv3
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  PREFIX=./DONE/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one

  Above script doesn't give me libx264.a in ffmpeg output builds.Several other scenarios are as follows.
  If I enable x264 encoder, I get undefined reference errors to some variables in x264.c (in libavcodec).
  If I enable shared in ffmpeg configure, I get an error which says it can't cd to my prefix directory (no permission issues by the way).

  I am using latest releases of ffmpeg and x264 (cloned the git today) and ndk 7. Ubuntu runs on VM, installed on Windows 7. For further details about my adventure of ffmpeg/x264 porting to Android, you may refer here.

  What should I do to use libx264 with ffmpeg ? I kept on trying this script with different configurations, removed all ffmpeg x264 folders and reinstalled them, but to no avail.

  Thanks a lot in advance.

  EDIT
  Below is my x264 build script. It builds fine, gives me the static library and the headers.

  export ARM_ROOT=/home/mehmet/Android_NDK_r7b
  
  export ARM_INC=$ARM_ROOT/platforms/android-8/arch-arm/usr/include/
  
  export ARM_LIB=$ARM_ROOT/platforms/android-8/arch-arm/usr/lib/
  
  export ARM_TOOL=$ARM_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  export ARM_LIBO=$ARM_TOOL/lib/gcc/arm-linux-androideabi/4.4.3
  
  export PATH=$ARM_TOOL/bin:$PATH
  
  export PATH=$ARM_TOOL/arm-linux-androideabi/bin:$PATH
  
  export ARM_PRE=arm-linux-androideabi
  
  #tries to build for 4.4.3 toolchain
  
  
  
  ./configure --prefix=./ndk7_build \
  
  --disable-gpac \
  
  --extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -MMD -MP " \
  
  --extra-ldflags=" -nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -nostdlib $ARM_LIB/crtbegin_dynamic.o $ARM_LIB/crtend_android.o -lc -lm -ldl -lgcc " \
  
  --cross-prefix=${ARM_PRE}- \
  
  --disable-asm \
  
  --enable-static \
  
  --host=arm-linux \

  This is what happens on terminal when i enable libx264 encoder.

  STRIP   ffmpeg
  
  INSTALL install-progs-yes
  
  INSTALL ffmpeg
  
  INSTALL ffprobe
  
  libavcodec/libavcodec.a(libx264.o): In function `X264_frame':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:158: undefined reference to `x264_picture_init'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:178: undefined reference to `x264_encoder_reconfig'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:189: undefined reference to `x264_encoder_encode'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:195: undefined reference to `x264_encoder_delayed_frames'
  
  libavcodec/libavcodec.a(libx264.o): In function `encode_nals':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:100: undefined reference to `x264_bit_depth'
  
  libavcodec/libavcodec.a(libx264.o): In function `X264_close':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:230: undefined reference to `x264_encoder_close'
  
  libavcodec/libavcodec.a(libx264.o): In function `X264_init':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:283: undefined reference to `x264_param_default'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:291: undefined reference to `x264_param_default_preset'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:313: undefined reference to `x264_param_parse'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:448: undefined reference to `x264_param_apply_fastfirstpass'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:451: undefined reference to `x264_param_apply_profile'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:494: undefined reference to `x264_encoder_open_125'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:505: undefined reference to `x264_encoder_headers'

• not able to create libffmpeg.so for android

  4 janvier 2013, par susheel tickoo

  I have tried to create a video from images and i haven done it successfully with MPEG4 codec and .m4v extension.Using this link

  now i want to use H264 codec for android devices.I am able to compile the code but when i use the function avcoded_find_encoder(CODEC_ID_H264). It gives me codec not found.
  I have seen the links for same on stackovrflow but they are of either no use or are not conclusive.

  Please help.
  thanks in advance.

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