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• Compile FFmpeg project for ARM in PC Linux 64-bits

  4 avril 2017, par Dang_Ho

  I want to compile a simple FFmpeg project for my Arrow Sockit Board with an arm-linux-gnueabihf architecture from my Linux-64bit PC. I don’t want to compile the project in the board directly because of my low CPU and that is not convenient for me.

  I’m using FFmpeg version 2.8.11 and this is my Makefile and my "main.c". I know, my Makefile has something wrong in it. If I command "make", it will compile depending on my PC’s architecture, I can’t use that binary file on my board. So, can someone please tell me how to do it.

  I Cross-Compiled the FFmpeg package and installed into the board. I tested all functions such as ffmpeg, ffplay. All them work. The source code folder is located to /home/hohaidang/ffmpeg-2.8.11

  #include 
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  int main(int argc, char *argv[]){
  
          av_register_all();
  
          return 0;
  
  }

  # use pkg-config for getting CFLAGS and LDLIBS
  
  FFMPEG_LIBS=    libavdevice                        \
  
                  libavformat                        \
  
                  libavfilter                        \
  
                  libavcodec                         \
  
                  libswresample                      \
  
                  libswscale                         \
  
                  libavutil                          \
  
  
  
  CFLAGS += -Wall -g
  
  CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
  
  LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS)
  
  
  
  EXAMPLES=       main
  
  
  
  OBJS=$(addsuffix .o,$(EXAMPLES))
  
  
  
  # the following examples make explicit use of the math library
  
  avcodec:           LDLIBS += -lm
  
  decoding_encoding: LDLIBS += -lm
  
  muxing:            LDLIBS += -lm
  
  resampling_audio:  LDLIBS += -lm
  
  
  
  .phony: all clean-test clean
  
  
  
  all: $(OBJS) $(EXAMPLES)
  
  
  
  clean-test:
  
          $(RM) test*.pgm test.h264 test.mp2 test.sw test.mpg
  
  
  
  clean: clean-test
  
          $(RM) $(EXAMPLES) $(OBJS)

• iframeextractor complied error using FFmpeg 3.2.4

  31 mars 2017, par asdemon

  I compile the FFmpeg-iOS using the script from https://github.com/kewlbear/FFmpeg-iOS-build-script

  when I add the compiled .a file to the iframeextractor project, it appear such errors :

  Undefined symbols for architecture i386:
 "_kVTProfileLevel_H264_Main_5_1", referenced from:
     _vtenc_init in libavcodec.a(videotoolboxenc.o)
 "_kVTProfileLevel_H264_Main_4_2", referenced from:
     _vtenc_init in libavcodec.a(videotoolboxenc.o)
 "_kVTProfileLevel_H264_Main_4_1", referenced from:
     _vtenc_init in libavcodec.a(videotoolboxenc.o)
 "_kVTProfileLevel_H264_Main_3_1", referenced from:
     _vtenc_init in libavcodec.a(videotoolboxenc.o)
 "_kVTProfileLevel_H264_Main_3_0", referenced from:
     _vtenc_init in libavcodec.a(videotoolboxenc.o)
 "_CMSampleBufferGetDecodeTimeStamp", referenced from:
     _vtenc_frame in libavcodec.a(videotoolboxenc.o)
....
ld: symbol(s) not found for architecture i386

  I search some where and add compile flag -libiconv and add libz.dylib，libbz2.dylib，libiconv.dylib, but the error goes on

  Is there some help ?

• Android FFMPEG build for arm64 failed with error ?

  30 janvier 2017, par bharat aghera

  I have made ffmpeg build with following build script.
  https://github.com/Free-Syj/ffmpeg-build-script/blob/master/build-android-ffmpeg.sh

  It worked for armv7.
  when I tried to make for arm64 architecture, it gave me following error.

  NDK/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-gcc is unable to create an executable file.

  Edited : -

  Following build script has been used to make the build.

  NDK=/Users/tapansodha/Documents/Softwares/AndroidStudio/adt-bundle-mac-x86_64-20140702/android-ndk-r10e
  
  function build_one
  
  {
  
  ./configure --target-os=linux \
  
  --prefix=$PREFIX \
  
  --enable-cross-compile \
  
  --extra-libs="-lgcc" \
  
  --arch=arm \
  
  --cc=$CC \
  
  --cross-prefix=$PREBUILT/bin/aarch64-linux-android- \
  
  --nm=$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 " \
  
  --enable-shared \
  
  --disable-static \
  
  --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
  --disable-everything \
  
  --disable-debug \
  
  --disable-programs \
  
  --disable-doc \
  
  --enable-decoder=h264 \
  
  --enable-decoder=mjpeg \
  
  --enable-decoder=mpeg4 \
  
  --enable-decoder=mxpeg \
  
  --enable-decoder=aac \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  
  
  make clean
  
  make  -j4 install
  
  }
  
  
  
  #arm arm64-v8a
  
  PLATFORM=$NDK/platforms/android-21/arch-arm64/
  
  PREBUILT=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64
  
  CC=$PREBUILT/bin/aarch64-linux-android-gcc
  
  NM=$PREBUILT/bin/aarch64-linux-android-nm
  
  CPU=arm64
  
  PREFIX=./android_arm64n/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one