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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.

• Stripping a video with start point and end point defined using TimeCodes

  12 juin 2014, par Tarun

  Is anyone aware about how to strip a segment out of a video , a segment whose start point and end points are defined by TimeCode not TimeStamp.

  I tried ffmpeg and ffmbc but I dont think they support cutting video based on timeCode.

  I have also considered approach where I can attemp to convert a timecode into timestamp

  Would anyone please advise ?

• fastest way to convert any audio file to low bitrate ? [migrated]

  16 février 2013, par kain

  using ffmpeg I'd like to have some directions/parameters to :

  • encode any audio file to a poor bitrate
  • strip artwork from file
  • optimize for speed
  • optimize for size

  My goal is to have a bare-bone file encoded in mp3 in the fastest time possible, quality does not matter (even 96kbps or less), it just needs to be extremely fast and result in small size.

  Any preset to share ?