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• Building ffmpeg for Android on Windows through MinGW

  23 mai 2012, par Harish

  I'm trying to build ffmpeg for Android on Windows through MiNGW but facing the below problem :

  AR libavcodec/libavcodec.a  
  
  LD ffmpeg_g.exe  
  
  LD ffplay_g.exe  
  
  LD ffprobe_g.exe  
  
  INSTALL libavcodec/libavcodec.a  
  
  CP ffmpeg.exe  
  
  STRIP ffmpeg.exe  
  
  CP ffprobe.exe  
  
  STRIP ffprobe.exe  
  
  CP ffplay.exe  
  
  STRIP ffplay.exe  
  
  INSTALL install-progs-yes  
  
  INSTALL ffmpeg.exe  
  
  INSTALL ffplay.exe  
  
  INSTALL ffprobe.exe  
  
  d:\android-ndk-r8\toolchains\arm-linux-androideabi-4.4.3\prebuilt\windows\bin\arm-linux-androideabi-ld.exe: cannot open output file ./android/armv7-a/libffmpeg.so: No such file or directory
  
  
  
  libavcodec/tscc.c: In function 'decode_frame':  
  
  libavcodec/tscc.c:97:24: warning: assignment discards qualifiers from pointer target type  
  
  ./libavcodec/avcodec.h:40:0: fatal error: when writing output to : Invalid argument  
  
  compilation terminated.  
  
  libavcodec/vc1dsp.c: In function 'ff_vc1dsp_init':  

  This is my build script :

  NDK=/d/android-ndk-r8  
  
  PLATFORM=$NDK/platforms/android-9/arch-arm/  
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows  
  
  function build_one_r6  
  
  {  
  
  ./configure \  
  
  --disable-shared \  
  
  --enable-static \  
  
  --enable-gpl \  
  
  --enable-version3 \  
  
  --enable-nonfree \  
  
  --disable-doc \  
  
  --disable-ffmpeg \  
  
  --disable-ffplay \  
  
  --disable-ffprobe \  
  
  --disable-ffserver \  
  
  --disable-avdevice \  
  
  --disable-avfilter \  
  
  --disable-postproc \  
  
  --enable-small \  
  
  --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \  
  
  --enable-cross-compile \  
  
  --target-os=linux \  
  
  --extra-cflags="-I$PLATFORM/usr/include" \  
  
  --extra-ldflags="-L$PLATFORM/usr/lib -nostdlib" \  
  
  --arch=arm \  
  
  --disable-symver \  
  
  --disable-debug \  
  
  --disable-stripping \  
  
  $ADDITIONAL_CONFIGURE_FLAG  
  
  sed -i 's/HAVE_LRINT 0/HAVE_LRINT 1/g' config.h  
  
  sed -i 's/HAVE_LRINTF 0/HAVE_LRINTF 1/g' config.h  
  
  sed -i 's/HAVE_ROUND 0/HAVE_ROUND 1/g' config.h  
  
  sed -i 's/HAVE_ROUNDF 0/HAVE_ROUNDF 1/g' config.h  
  
  sed -i 's/HAVE_TRUNC 0/HAVE_TRUNC 1/g' config.h  
  
  sed -i 's/HAVE_TRUNCF 0/HAVE_TRUNCF 1/g' config.h  
  
  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=  

  Any idea what I'm missing here ? Please note that I was able to build ffmpeg for Windows desktop successfully so I assume the setup is correct.

• Building ffmpeg for Android in Windows through cygwin : cannot execute binary file

  22 mai 2012, par Harish

  I'm trying to build ffmpeg for Android in Cygwin and the build script (http://www.roman10.net/how-to-build-ffmpeg-for-android/) is giving me a problem on the below line :

  $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o

  /home/pxb743/android-ndk-r5b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/lin
  ux-x86/bin/arm-linux-androideabi-gcc : /home/pxb743/android-ndk-r5b/toolchains/ar
  m-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc : cann
  ot execute binary file

  file ./arm-linux-androideabi-ar

  ./arm-linux-androideabi-ar : ELF 32-bit LSB executable, Intel 80386, version 1 (S
  YSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.8, stripped

  Can anyone please help me in identifying where the problem is ? Cygwin environment or NDK version (Tried with several versions) or ffmpeg (I could build ffmpeg for Windows Desktop successfully)

• extract audio with youtube-dl on windows

  12 mars 2017, par FlyingNimbus

  I want to extract audio from a video downloaded with youtube-dl on windows. I got youtube-dl working, but am unable to extract the audio. This problem is caused due to not having the correct audio codes installed. When i try to extract audio it tells me the following :

  ’WARNING : unable to obtain file audio codes with ffprobe’

  youtube-dl man sais the following :
   x -extract-audio convert video files to audio-only files (requires ffmpeg or avconv and ffprobe or avprobe)

  How do I install ffprobe or ffmpeg ? Do I install this on windows, or do I install this as a python extension ? I have no idea, can someone point me in the right direction ?

  OS : windows 7