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Sur d’autres sites (5104)

  • X264 & ARM encoding on Android

    20 janvier 2013, par Tishu

    I recently built a Video encoding class that runs on Android using ffmpeg and native code. I am surprised by the time it takes to encode a video, about 1 frame / second at best. I have tried with x264 and settings optimised for speed and with mpeg as well - no real difference.

    The x264 library now has support for ARM architecture and is meant to be quite efficient on these boasting over 20fps encoding speed. I am not sure I am using it correctly. Here the script I use for compiling :

    ./configure --prefix=$PREFIX \
    
--enable-shared \
    
--enable-static \
    
--disable-gpac \
    
--enable-debug \
    
--extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -msoft-float -mthumb -O3 -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,/usr/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -lc -lm -ldl -lgcc" \
    
--cross-prefix=${ARM_PRE}- \
    
--disable-asm \
    
--host=arm-linux \

    I believe the last line should so what I am after ie enable ARM optimisations. Maybe I am missing something.

    For info I am encoding a 640x480 video on a Nexus 7 tablet. Here are my encoder settings (x264)

    c->gop_size       = 12;
    
c->pix_fmt        = PIX_FMT_YUV420P;
    
c->max_b_frames   = 0;
    
c->scenechange_threshold = 0;
    
c->rc_buffer_size = 0;

    Thanks

  • getting error in compiling ffmpeg library

    4 septembre 2012, par user1646242

    I am using ffmpeg library in one of my app.While compiling it,i am getting following error :

    $ ./build_android.sh
    
./build_android.sh: line 113: syntax error near unexpected token `$'\r''
    
'/build_android.sh: line 113: `function build_one

    This is the script i am using for it :

    #!/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=~/C:/android-ndk-r8b
    
PLATFORM=$NDK/platforms/android-15/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

    Please tell me what is the problem with it ? I have tried many solutions but nothing is working.

  • 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'

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