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• Android FFMPEG Build with librtmp

  20 décembre 2013, par Dan Turner

  I have been pulling my hair out trying to compile FFMPEG for Android with librtmp enabled. I have successfully built FFMPEG using the Guardian Project here, but it doesn't have librtmp support. The only answer I have found to this issue is on a previous Stack Overflow question (HERE), but it doesn't want to work for me.

  At the moment, I have the cross-compiled librtmp.so.0 file from the official rtmpdump android build in an rtmpdump/librtmp folder sitting in the android-ffmpeg folder. An extract from my configure_ffmpeg.sh file reads as follows :

  ./configure \
  
  $DEBUG_FLAG \
  
  --arch=arm \
  
  --cpu=cortex-a8 \
  
  --target-os=linux \
  
  --enable-runtime-cpudetect \
  
  --prefix=$prefix \
  
  --enable-pic \
  
  --disable-shared \
  
  --enable-static \
  
  --cross-prefix=$NDK_TOOLCHAIN_BASE/bin/$NDK_ABI-linux-androideabi- \
  
  --sysroot="$NDK_SYSROOT" \
  
  --extra-cflags="-I../x264 -mfloat-abi=softfp -mfpu=neon" \
  
  --extra-ldflags="-L../x264" \
  
  --extra-cflags="-I/home/dan/android-ffmpeg/rtmpdump" \
  
  --extra-ldflags="-L/home/dan/android-ffmpeg/rtmpdump -lrtmp"
  
  \
  
  
  
  --enable-version3 \
  
  --enable-gpl \
  
  \
  
  --disable-doc \
  
  --enable-yasm \
  
  \
  
  --enable-decoders \
  
  --enable-encoders \
  
  --enable-muxers \
  
  --enable-demuxers \
  
  --enable-parsers \
  
  --enable-protocols \
  
  --enable-filters \
  
  --enable-avresample \
  
  --enable-libfreetype \
  
  \
  
  --disable-indevs \
  
  --enable-indev=lavfi \
  
  --disable-outdevs \
  
  \
  
  --enable-hwaccels \
  
  \
  
  --enable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --enable-ffserver \
  
  --enable-network \
  
  \
  
  --enable-libx264 \
  
  --enable-zlib \
  
  --enable-librtmp \

  When I try to compile this, it eventually displays an error and my FFMPEG config.log file tells me that it can't find -lrtmp. I'm positive I'm directing it to the right directory... does anyone have any ideas ?

  Regards

  Dan

• Is it okay to execute ffmpeg and do not use their library ?

  18 juillet 2017, par Michael Pravilov

  I need to extract audio from video and save it. FFmpeg has command for this purpose. I wonder if it is a right way to execute ffmpeg from my code and not to write code with their API functions.

  The lack of this approach is that I use Qt Framework and need cross-platform application. Sometimes (especially in windows, because PATH variable doesn’t set up automatically so call ffmpeg won’t work) a user will need to indicate path to executable file to run in command line.

  So both variants are possible to realize, but which is the best and correct one ?

  I don’t really want to use their API because it is not so easy to understand and will take time to write my own code.

  Thanks for any advice !

• How to solve bad instruction `vadd.i16 q0,q0,q0' when attempting to check gcc for neon instruction

  6 juillet 2012, par newentry

  Checking  gcc supports failed for neon instruction vadd.i16 q0,q0,q0
  
      test.c
  
  
  
      int main ()
  
      {
  
       __asm__("vadd.i16 q0, q0, q0"); return 0;
  
      }
  
  
  
      arm-linux-androideabi-gcc test.c
  
      /tmp/ccfc8m0G.s: Assembler messages:
  
      /tmp/ccfc8m0G.s:24: Error: bad instruction `vadd.i16 q0,q0,q0'

  Tried with flags -mcpu=cortex-a8 -mfpu=neon but stil no success

  Above code was used to test gcc support for neon instruction.

  Actually i am trying to build x264 with NEON support for ARM platformAfter running configure script
  x264 config log file contains

  Command line options : "—cross-prefix=arm-linux-androideabi-" "—enable-pic" "—extra- cflags=-mcpu=cortex-a8" "—host=arm-linux"

  checking whether arm-linux-androideabi-gcc works... yes
  
  checking whether arm-linux-androideabi-gcc supports for( int i = 0; i < 9; i++ ); with -std=gnu99... yes
  
  checking whether arm-linux-androideabi-gcc supports __asm__("rev ip, ip");... yes
  
  checking whether arm-linux-androideabi-gcc supports __asm__("movt r0, #0");... yes
  
  checking whether arm-linux-androideabi-gcc supports __asm__("vadd.i16 q0, q0, q0");... no
  
  
  
  arm-linux-androideabi-gcc conftest.c  -Wall -I. -I$(SRCPATH) -mcpu=cortex-a8 -std=gnu99    -lm -o conftest
  
  E:\cygwin\tmp\ccVtVI1i.s: Assembler messages:
  
  E:\cygwin\tmp\ccVtVI1i.s:24: Error: bad instruction `vadd.i16 q0,q0,q0'
  
  --------------------------------------------------
  
  Failed program was:
  
  --------------------------------------------------
  
  int main () { __asm__("vadd.i16 q0, q0, q0"); return 0; }
  
  --------------------------------------------------
  
  
  
  
  
  config.h contains
  
  
  
  #define HAVE_MALLOC_H 1
  
  #define HAVE_ARMV6 1
  
  #define HAVE_ARMV6T2 1
  
  #define ARCH_ARM 1
  
  #define SYS_LINUX 1
  
  #define HAVE_VECTOREXT 1
  
  #define fseek fseeko
  
  #define ftell ftello
  
  #define HAVE_GPL 1
  
  #define HAVE_INTERLACED 1
  
  #define HAVE_ALTIVEC 0
  
  #define HAVE_ALTIVEC_H 0
  
  #define HAVE_MMX 0
  
  #define HAVE_NEON 0
  
  #define HAVE_BEOSTHREAD 0
  
  #define HAVE_POSIXTHREAD 0
  
  #define HAVE_WIN32THREAD 0
  
  #define HAVE_THREAD 0
  
  #define HAVE_LOG2F 0
  
  #define HAVE_VISUALIZE 0
  
  #define HAVE_SWSCALE 0
  
  #define HAVE_LAVF 0
  
  #define HAVE_FFMS 0
  
  #define HAVE_GPAC 0
  
  #define HAVE_GF_MALLOC 0
  
  #define HAVE_AVS 0
  
  #define HAVE_CPU_COUNT 0
  
  
  
  
  
  Running make command build x264 static lib  based on above config.h which contains HAVE_NEON 0
  
  
  
  
  
  **Compiler Version**
  
  
  
  
  
  
  
  arm-linux-androideabi-gcc -v
  
  Using built-in specs.
  
  Target: arm-linux-androideabi
  
  Configured with: /tmp/ndk-digit/src/build/../gcc/gcc-4.4.3/configure --prefix=/usr/local/google/digit/repo/opensource/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows --target=arm-linux-androideabi --host=i586-mingw32msvc --build=x86_64-linux-gnu --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-gmp=/tmp/ndk-digit/build/toolchain/temp-install --with-mpfr=/tmp/ndk-digit/build/toolchain/temp-install --disable-libssp --enable-threads --disable-nls --disable-libmudflap --disable
  
  -libgomp --disable-libstdc__-v3 --disable-sjlj-exceptions --disable-shared --disable-tls --with-float=soft --with-fpu=vfp --with-arch=armv5te --enable-target-optspace --enable-initfini-array --disable-nls --prefix=/usr/local/google/digit/repo/opensource/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows --with-sysroot=/usr/local/google/digit/repo/opensource/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/sysroot --with-binutils-version=2.20.1 --with-mpfr-version=2.4.1 --with
  
  -gmp-version=4.2.4 --with-gcc-version=4.4.3 --with-gdb-version=6.6 --with-arch=armv5te --program-transform-name='s,^,arm-linux-androideabi-,'
  
  Thread model: posix
  
  gcc version 4.4.3 (GCC)    

  Goal is to utilize neon enabled ARM processor to boost x264 encoder performance...