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• Build FFMPEG under Cygwin in Windows OS for Android

  8 juin 2017, par Jun Kim

  For the past couple days, I have been trying hard to build FFMPEG for a Android project on Windows Operating System using android-ndk-14d using Cygwin.
  I have followed many tutorials out there, and I ahve encountered so many errors while building FFMPEG using build_android.sh.

  Here are the steps that I have taken so far.

  I downloaded Cygwin and configured all the dependencies that I need for building FFMPEG.

  I opened ffmpeg-3.3.1/configure file with a text editor, and changed to the following lines.

  SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME)'

  my build_android.sh is as below

  #!/bin/bash
  
  NDK=C:/~/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-21/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --enable-shared \
  
      --disable-static \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-doc \
  
      --disable-symver \
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi-\
  
      --target-os=android \
  
      --arch=arm \
  
      --cpu=armv7-a \
  
      --enable-cross-compile \
  
      --sysroot=$SYSROOT \
  
      --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
      --extra-ldflags="$ADDI_LDFLAGS" \
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  I ran these commands

  dos2unix build_android.sh 
  
  chmod +x build_android.sh
  
  ./build_android.sh

  and,,,currently getting this error

  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so:1:1 : syntax error,
  unexpected ’ !’, exp ecting $end

  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so : not an object or
  archive collect2.exe : error : ld returned 1 exit status
  make : *** [library.mak:94 : libswscale/libswscale-4.so] Error 1 LD

  libswscale/libswscale-4.so
  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so:1:1 : syntax error,
  unexpected ’ !’, exp ecting $end

  c :/users/sonic/appdata/local/android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/p
  rebuilt/windows-x86_64/bin/../lib/gcc/arm-linux->androideabi/4.9.x/../../../../arm-linux-an
  droideabi/bin/ld.exe : error : libavutil/libavutil.so : not an object or
  archive collect2.exe : error : ld returned 1 exit status make : ***
  [library.mak:94 : libswscale/libswscale-4.so] Error 1

  How to compile ffmpeg-2.5.3 on windows with android-ndk-r10d

  From the comments that were commented on the above link, it seems like it is
  easier to build FFMPEG in Linux/Unix OS. My first can be a dumb question. But If there is anyone who can guide me through this, i will be really appreciated it.

  If I build FFMPEG on Linux for Android, could I possibly copy or move those
  resulted output (The arm/lib folder contains the shared libraries, while arm/include folder contains the header files for libavcodec, libavformat, libavfilter, libavutil, libswscale etc.) to Windows OS and utilize them for
  my Android project ?

  Since my company only provides Windows OS for a project, I have to utilize them on Windows OS.

  Thank you for your time, and if there is any feedback that you can provide it will definitely be helpful.

  For the reference, here is my config.log

  END c :/ffmpegtmp/ffconf.qoBF6X98.c
  C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc —sysroot=C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/

  -isysroot C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/
  -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -Os -fpic -marm -march=armv7-a -std=c11 -fomit-frame-pointer -fPIC -marm -pthread -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -c -o c :/ffmpegtmp/ffconf.8joa74tC.o

  c :/ffmpegtmp/ffconf.qoBF6X98.c
  check_cflags -fdiagnostics-color=auto test_cflags
  -fdiagnostics-color=auto check_cc -fdiagnostics-color=auto BEGIN c :/ffmpegtmp/ffconf.qoBF6X98.c
  1 int x ; END c :/ffmpegtmp/ffconf.qoBF6X98.c C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc —sysroot=C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/

  -isysroot C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/
  -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -Os -fpic -marm -march=armv7-a -std=c11 -fomit-frame-pointer -fPIC -marm -pthread -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -fdiagnostics-color=auto -c -o c :/ffmpegtmp/ffconf.8joa74tC.o c :/ffmpegtmp/ffconf.qoBF6X98.c test_cflags -Wmaybe-uninitialized check_cc -Wmaybe-uninitialized BEGIN

  c :/ffmpegtmp/ffconf.qoBF6X98.c
  1 int x ; END c :/ffmpegtmp/ffconf.qoBF6X98.c C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc —sysroot=C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/

  -isysroot C :/Users/sonic/AppData/Local/Android/sdk/ndk-bundle/platforms/android-9/arch-arm/
  -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -Os -fpic -marm -march=armv7-a -std=c11 -fomit-frame-pointer -fPIC -marm -pthread -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -fdiagnostics-color=auto -Wmaybe-uninitialized -c -o c :/ffmpegtmp/ffconf.8joa74tC.o c :/ffmpegtmp/ffconf.qoBF6X98.c

• What is the best gpu in the market for video encoding (H.264 and H.265) [closed]

  12 août 2020, par Hamza Ghizaoui

  So, I m using FFMPEG for video encoding.
I get a stream of BMP images, each with 4000x3000 resoltuion. 20 Image per second (image size circa 35 mbyte).
I must encode that and stream it in real time. a maximum of 100 ms is allowed between ghe moment of receiving the photo and the moment of displaying that on the browser.

  


  I m using FFMPEG with nvidia nvenc hardware accelration .

  


  maximum budget is 2000$ for the GPU.

  


• ffmpeg stream_loop using system audio on Raspberry Pi

  9 avril 2020, par beamercola

  I have a functioning ffmpeg stream_loop going out to YouTube but I'd like to add my own soundtrack.

  



  Ideally I can just output system audio - is that possible ?

  



  Otherwise, the audio is coming from Sonic Pi, and I just need to figure out how to route that to an audio channel input

  



  thanks !