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• arm-linux-androideabi/bin/ld : error : cannot find -lpolarssl while compiling rtmp library for Android (host os -Debian)

  24 octobre 2014, par trololo

  I’m trying to build rtmp library for ffmpeg for my Android app.
  In order to compile ffmpeg I have to compile rtmp-library.
  For librtmp.a I need to compile polarssl. I got polarssl library (libpolarssl, -lpolarssl)
  script for polarssl :

   #!/bin/bash
  
  ANDROID_NDK=/home/sla/work/android-ndk-r10b86/android-ndk-r10b/
  
  TOOLCHAIN=/home/sla/ffmpeg_build/polarssl/
  
  $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --toolchain=arm-linux-androideabi-4.8 \
  
    --system=linux-x86 --platform=android-3 --install-dir=$TOOLCHAIN
  
  cd /home/sla/ffmpeg_sources/polarssl-1.2.11
  
  
  
  export CROSS_COMPILE=arm-linux-androideabi
  
  export CC="${CROSS_COMPILE}-gcc"
  
  export CXX="${CROSS_COMPILE}-g++"
  
  
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  #export CC="arm-linux-androideabi-gcc"
  
  #export CXX="arm-linux-androideabi-g++"
  
  export LD=arm-linux-androideabi-ld
  
  export STRIP=arm-linux-androideabi-strip
  
  
  
  export CFLAGS="-std=c99 -O3 -Wall -mthumb -pipe -fpic -fasm \
  
    -march=armv7-a -mfpu=neon -mfloat-abi=hard -mvectorize-with-neon-quad \
  
    -finline-limit=300 -ffast-math -fmodulo-sched -fmodulo-sched-allow-regmoves \
  
    -mhard-float -D_NDK_MATH_NO_SOFTFP=1 -fdiagnostics-color=always \
  
    -Wno-psabi -Wa,--noexecstack \
  
    -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
  
    -DANDROID -DNDEBUG"
  
  
  
  export LDFLAGS="-lm_hard -lz -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--fix-cortex-a8 -Wl,--no-warn-mismatch"
  
  #cd /home/sla/ffmpeg_sources
  
  #autoreconf -fiv
  
  #./configure --host=arm-linux-androideabi --prefix="`pwd`/build/"
  
  #--disable-shared
  
  #rm -r build
  
  make lib -j7 SYS=android CC="$CC" APP=
  
  make install DESTDIR=/home/sla/ffmpeg_sources/polarssl

  It works fine and creates correspond lirary but when I try to compile rtmplib (rtmpdump) using script

  #!/bin/bash
  
  ANDROID_NDK=/home/sla/work/android-ndk-r10b86/android-ndk-r10b/
  
  TOOLCHAIN=/home/sla/ffmpeg_build/rtmp/
  
  $ANDROID_NDK/build/tools/make-standalone-toolchain.sh --toolchain=arm-linux-androideabi-4.8 \
  
    --system=linux-x86 --platform=android-3 --install-dir=$TOOLCHAIN
  
  cd /home/sla/ffmpeg_sources/rtmpdump
  
  
  
  export CROSS_COMPILE=arm-linux-androideabi
  
  #export CC=${CROSS_COMPILE}-gcc
  
  #export CXX=${CROSS_COMPILE}-g++
  
  
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  export CC="arm-linux-androideabi-gcc"
  
  export CXX="arm-linux-androideabi-g++"
  
  export LD=arm-linux-androideabi-ld
  
  export STRIP=arm-linux-androideabi-strip
  
  
  
  export CFLAGS="-std=c99 -O3 -Wall -mthumb -pipe -fpic -fasm \
  
    -march=armv7-a -mfpu=neon -mfloat-abi=hard -mvectorize-with-neon-quad \
  
    -finline-limit=300 -ffast-math -fmodulo-sched -fmodulo-sched-allow-regmoves \
  
    -mhard-float -D_NDK_MATH_NO_SOFTFP=1 -fdiagnostics-color=always \
  
    -Wno-psabi -Wa,--noexecstack \
  
    -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
  
    -DANDROID -DNDEBUG"
  
  
  
  export LDFLAGS="-lm_hard -lz -Wl,--no-undefined -Wl,-z,noexecstack -Wl,--fix-cortex-a8 -Wl,--no-warn-mismatch"
  
  #cd /home/sla/ffmpeg_sources
  
  #autoreconf -fiv
  
  #./configure --host=arm-linux-androideabi --prefix="`pwd`/build/"
  
  #--disable-shared
  
  rm -r build
  
  make -j7 SYS=android CROSS_COMPILE=arm-linux-androideabi- INC="-I/home/sla/ffmpeg_sources/polarssl-1.2.11/include/ -L/home/sla/ffmpeg_sources/polarssl-1.2.11/library/" CRYPTO=POLARSSL SHARED=
  
  make install
  
  make distclean

  I recieve such error :

  /home/sla/ffmpeg_build/rtmp/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lpolarssl

  More :

  Copying prebuilt binaries...
  
  Copying sysroot headers and libraries...
  
  Copying c++ runtime headers and libraries...
  
  Copying files to: /home/sla/ffmpeg_build/rtmp/
  
  Cleaning up...
  
  Done.
  
  rm: cannot remove `build': No such file or directory
  
  make[1]: Entering directory `/home/sla/ffmpeg_sources/rtmpdump/librtmp'
  
  make[1]: Nothing to be done for `all'.
  
  make[1]: Leaving directory `/home/sla/ffmpeg_sources/rtmpdump/librtmp'
  
  arm-linux-androideabi-gcc -Wall  -o rtmpdump rtmpdump.o -Llibrtmp -lrtmp -lpolarssl -lz  
  
  arm-linux-androideabi-gcc -Wall  -o rtmpgw rtmpgw.o thread.o  -Llibrtmp -lrtmp -lpolarssl -lz  
  
  arm-linux-androideabi-gcc -Wall  -o rtmpsrv rtmpsrv.o thread.o  -Llibrtmp -lrtmp -lpolarssl -lz  
  
  arm-linux-androideabi-gcc -Wall  -o rtmpsuck rtmpsuck.o thread.o  -Llibrtmp -lrtmp -lpolarssl -lz  
  
  /home/sla/ffmpeg_build/rtmp/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lpolarssl
  
  librtmp/librtmp.a(rtmp.o):rtmp.c:function isValidPublicKey: error: undefined reference to 'mpi_init'
  
  librtmp/librtmp.a(rtmp.o):rtmp.c:function isValidPublicKey: error: undefined reference to 'mpi_lset'
  
  librtmp/librtmp.a(rtmp.o):rtmp.c:function isValidPublicKey: error: undefined reference to 'mpi_cmp_mpi'
  
  librtmp/librtmp.a(rtmp.o):/rtmp.c:function homeisValidPublicKey/:sla /errorffmpeg_build:/ rtmpundefined/ binreference/ .to. /'libmpi_copy/'gcc
  
  /librtmparm/-librtmp.alinux(-rtmp.oandroideabi)/:4.8rtmp.c/:.function. /isValidPublicKey.:. /error.:. /undefined. .reference/ armto- linux'-mpi_sub_intandroideabi'/
  
  binlibrtmp//ldlibrtmp.a:( rtmp.oerror):: rtmp.ccannot: functionfind  isValidPublicKey-:lpolarssl 
  
  errorlibrtmp:/ librtmp.aundefined( rtmp.oreference) :tortmp.c :'functionmpi_cmp_mpi 'isValidPublicKey
  
  :librtmp /errorlibrtmp.a:( rtmp.oundefined) :referencertmp.c :tofunction  'isValidPublicKeympi_init:' 
  
  errorlibrtmp:/ librtmp.aundefined( rtmp.oreference) :tortmp.c :'functionmpi_exp_mod 'isValidPublicKey
  
  :librtmp /errorlibrtmp.a:( rtmp.oundefined) :referencertmp.c :tofunction  'isValidPublicKeympi_lset:' 
  
  errorlibrtmp:/ librtmp.aundefined( rtmp.oreference) :tortmp.c :'functionmpi_cmp_int 'isValidPublicKey
  
  :librtmp /errorlibrtmp.a:( rtmp.oundefined) :referencertmp.c :tofunction  'isValidPublicKeympi_cmp_mpi:' 
  
  errorlibrtmp:/ librtmp.aundefined( rtmp.oreference) :tortmp.c :'functionmpi_free 'isValidPublicKey
  
  :librtmp /errorlibrtmp.a:( rtmp.oundefined) :referencertmp.c :tofunction  'DHGenerateKeympi_copy:' 
  
  errorlibrtmp:/ librtmp.aundefined( rtmp.oreference) :tortmp.c :'functionmpi_copy 'isValidPublicKey
  
  :librtmp /errorlibrtmp.a:( rtmp.oundefined) :referencertmp.c :tofunction  'DHGenerateKeympi_sub_int:' 
  
  errorlibrtmp:/ librtmp.aundefined( rtmp.oreference) :tortmp.c :'functionmpi_copy 'isValidPublicKey
  
  :librtmp /errorlibrtmp.a:( rtmp.oundefined) :referencertmp.c :tofunction  'DHGenerateKeympi_cmp_mpi:' 

  ETC..... A LOT OF ERRORS

  Hot to fix this error ?

• Use parameter expansions in a command run from "find | xargs" to prevent output overwriting

  20 février 2019, par Philipp

  I have this bash script that is looking for mp4 files in subfolders with certain names and saves frames of those videos as jpeg.

  #!/bin/bash
  
  find ../folder -type f -iname '*C00*.mp4' | xargs -I %% ffmpeg -i %% -vf fps=1 -q:v 3 "../frames/_${i%.*}_frame%d.jpg"

  The problem is that everytime the script finishes one video the .jepg output files of the next videos are overwriting the existing ones.

  How can I prevent that ?

• OpenCV Cmake unable to find ffmpeg lib

  29 juillet 2016, par URMISH THAKKER

  I am trying to compile OpenCV with ffmpeg support for ARM Platform on a x86 host.

  I downloaded and compiled ffmpeg for arm platform (both static - FFMPEG_ARM_LIB and dynamic libs - FFMPEG_ARM_LIB_SO)

  When I run cmake in opencv, it gives the following -

  --   Video I/O:
  
  --     DC1394 1.x:                  NO
  
  --     DC1394 2.x:                  NO
  
  --     FFMPEG:                      **NO**
  
  --       codec:                     NO
  
  --       format:                    NO
  
  --       util:                      NO
  
  --       swscale:                   NO
  
  --       gentoo-style:              YES
  
  --     GStreamer:                   NO
  
  --     OpenNI:                      NO
  
  --     OpenNI PrimeSensor Modules:  NO
  
  --     PvAPI:                       NO
  
  --     GigEVisionSDK:               NO
  
  --     UniCap:                      NO
  
  --     UniCap ucil:                 NO
  
  --     V4L/V4L2:                    NO/YES
  
  --     XIMEA:                       NO
  
  --     Xine:                        NO

  I changed the following flags to point to the lib paths of both ffmpeg static and dynamic libs-

  1. LD_LIBRARY_PATH
  2. C_INCLUDE_PATH
  3. CPLUS_INCLUDE_PATH
  4. PKG_CONFIG_PATH
  5. PKG_CONFIG_LIBDIR
  6. PATH
  7. CMAKE_LIBRARY_PATH
  8. CMAKE_INCLUDE_PATH

  However, the opencv is still not able to recognize the ffmpeg libs.

  My FFMPEG compilation command was

  ./configure --enable-shared --disable-static\
  
   --cross-prefix=arm-linux-gnueabi- --arch=armv7a\
  
   --target-os=linux --prefix=<path>
  
  </path>

  What am I doing wrong here ?
  1. Am I compiling the ffmpeg with the wrong option ?
  2. Am I missing some element in CMake which would make it point to the compiled ffmpeg lib for ARM on my system ?