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• Trouble linking ffmpeg example source code

  30 janvier 2012, par Leonard Teo

  I managed to build ffmpeg and libx264 on my Ubuntu 11.10 machine from source.

  I'm trying to work on the example source file decoding_encoding.c. The examples comes with a makefile, so I can just type in "make all" and it magically compiles and links everything. Now, I'm trying to compile and link from the command line but I can't seem to get it to link.

  Here is the makefile :

  # use pkg-config for getting CFLAGS abd LDFLAGS
  
  FFMPEG_LIBS=libavdevice libavformat libavfilter libavcodec libswscale libavutil
  
  CFLAGS+=$(shell pkg-config  --cflags $(FFMPEG_LIBS))
  
  LDFLAGS+=$(shell pkg-config --libs $(FFMPEG_LIBS))
  
  
  
  EXAMPLES=decoding_encoding filtering metadata muxing
  
  
  
  OBJS=$(addsuffix .o,$(EXAMPLES))
  
  
  
  %: %.o
  
          $(CC) $< $(LDFLAGS) -o $@
  
  
  
  %.o: %.c
  
          $(CC) $< $(CFLAGS) -c -o $@
  
  
  
  .phony: all clean
  
  
  
  all: $(OBJS) $(EXAMPLES)
  
  
  
  clean:
  
          rm -rf $(EXAMPLES) $(OBJS)

  I can compile the source using this :

  gcc -Wall -I/usr/local/include -c -o decoding_encoding.o decoding_encoding.c

  When I try to link using this :

  gcc -Wall -L/usr/local/lib -lavdevice -lavformat -lavfilter -lavcodec -lswscale -lavutil -o decoding_encoding decoding_encoding.o

  At this point, I get a huge list of 'undefined reference error'

  decoding_encoding.o: In function `audio_encode_example':
  
  decoding_encoding.c:(.text+0x25): undefined reference to `avcodec_find_encoder'
  
  decoding_encoding.c:(.text+0x6a): undefined reference to `avcodec_alloc_context3'
  
  decoding_encoding.c:(.text+0xad): undefined reference to `avcodec_open'
  
  decoding_encoding.c:(.text+0x1ce): undefined reference to `sin'
  
  decoding_encoding.c:(.text+0x238): undefined reference to `avcodec_encode_audio'
  
  decoding_encoding.c:(.text+0x297): undefined reference to `avcodec_close'
  
  decoding_encoding.c:(.text+0x2a3): undefined reference to `av_free'
  
  decoding_encoding.o: In function `audio_decode_example':
  
  decoding_encoding.c:(.text+0x2f7): undefined reference to `av_init_packet'
  
  decoding_encoding.c:(.text+0x30b): undefined reference to `avcodec_find_decoder'
  
  decoding_encoding.c:(.text+0x359): undefined reference to `avcodec_alloc_context3'
  
  decoding_encoding.c:(.text+0x379): undefined reference to `avcodec_open'
  
  ..... etc.
  
  collect2: ld returned 1 exit status

  Am I doing something wrong with my linker command ? I've examined the makefile and I believe that I'm doing exactly what the makefile is....or am I ?

  Thanks,

  Leo

• Build FFMPEG with x264 for Android

  12 novembre 2016, par Kage

  I am trying to build FFMPEG with libx264 for Android.

  I can successfully build and use FFMPEG for Android but I realized that I need the ability to encode, therefore I am trying to build FFMPEG with x264.

  I am using this tutorial to build FFmpeg for Android http://www.roman10.net/how-to-build-ffmpeg-for-android/

  When trying to build FFMPEG I get an error :

  "ERROR : libx264 not found"

  And in my log it says :

  "/usr/local/lib/libx264.a : could not read symbols : Archive has no
  index ; run ranlib to add one..."

  I have the latest versions of both FFMPEG and x264.
  I understand that FFMPEG looks for the header and libraries in usr/lib and usr/include, so in order to make it find x264 I use the cflags and ldflags :

  • —extra-cflags = " -I/usr/local/include "
  • —extra-ldflags = " -L/usr/local/lib "

  I have tried building x264 with many different options that other people on the internet have said that i need. eg. —enable-shared, —enable-static, —disable-pthreads etc.
  Some forums say enable this, others say no disable that.

  Any help would be much appreciated,
  Thanks

  EDIT :

  If I build FFmpeg with the simplest commands to include libx264 then it works.
  ie.

  ./configure --enable-gpl --enable-libx264 --extra-cflags="-I/usr/local/include" --extra-ldflags="-L/usr/local/lib" --enable-static --enable-shared

  However I need it to work for Android. The script I am using is :

  NDK=~/Desktop/android-ndk-r7
  
  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86
  
  function build_one
  
  {
  
  ./configure --target-os=linux \
  
      --prefix=$PREFIX \
  
      --enable-cross-compile \
  
      --enable-shared \
  
      --enable-static \
  
      --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 -I/usr/local/include" \
  
      --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L $PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog -L/usr/local/lib " \
  
      --enable-gpl \
  
      --enable-libx264 \
  
      --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-encoder=mjpeg \
  
      --enable-encoder=h263 \
  
      --enable-encoder=mpeg4 \
  
      --enable-encoder=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
  
  }
  
  
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  PREFIX=./android/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one

  I am guessing that some option in my configure command is conflicting with enabling libx264

  NOTE : If I remove —enable-libx264 then it works

• iOS Video Player FFmpeg

  13 février 2013, par Rahim Jan

  So I want to make an app for the iPhone that will play live mms :// video streams.

  I have look around, and everywhere says that I'll need FFmpeg in order to accomplish it. So I successfully compiled the FFmpeg libraries, but now

  Do I have to convert the mms :// link to a .m3u8 link ? Or I can just use apples AV Foundation Framework ?

  Thanks !