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• Process each frame of a video back and compile back into a video

  5 mai 2015, par Namingwaysway

  I have a bash script that takes in an image, and processes the image using convert, tesseract, and a custom python script.

  What I would like to do next, is take in each frame of a video [ideally only processing on "scene" changes], process that frame, and use the resulting frames to build a new video.

  I have been down the path of "dump every frame to an image, batch process it, and compile it back", but I don’t have the storage space for anything over a few seconds with that.

  Any ideas ?

• convert and delete mkv files with ffmpeg

  19 mars 2015, par Brocolli Rob

  I have a server running Ubuntu 14.10 and Plex streaming to a PS3. Anyway, some files are mkv’s and they’re choking on transcoding. So, I’ve got ffmpeg and I’d like to go through all the subdirectories of the high level media folder and convert any mkv’s to mp4’s for streaming.
  I’ve experimented with some bash scripts I’ve found on the internet but have had mixed results.

  Any thoughts on how to do this ? I know there’s a command-line-fu, one-liner that can probably do it. Maybe something like find all the mkv’s in the subdirectories with find and then somehow passing that to a bash for loop ?

• libx264 encoder error in ffmpeg android build

  26 décembre 2013, par kerim yucel

  Right now, I have a ffmeg build script which recognizes libx264 and compiles succesfully. I have also compiled x264 and obtained libx264.a library. Both ffmpeg and libx264 are built from source. I can build ffmpeg without libx264 succesfully as well. Below you may find my script which tries to build ffmpeg with libx264.

  #!/bin/bash
  
  NDK=~/Android_NDK_r7b
  
  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  alitan=~/x264/ndk7_build
  
  function build_one
  
  {
  
  ./configure --target-os=linux \
  
  --prefix=$PREFIX \
  
  --enable-cross-compile \
  
  --extra-libs="-lgcc " \
  
  --arch=arm \
  
  --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
  --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
  --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
  --sysroot=$PLATFORM \
  
  --extra-cflags=" -I$alitan/include" \
  
  --disable-shared \
  
  --enable-static \
  
  --extra-ldflags=" -L$alitan/lib " \
  
  --enable-version3 \
  
  --enable-gpl \
  
  --disable-doc \
  
  --disable-everything \
  
  --enable-libx264 \
  
  --enable-encoder=libx264 \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  
  
  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
  
  }
  
  
  
  #arm v7vfpv3
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  PREFIX=./DONE/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one

  Above script doesn’t give me libx264.a in ffmpeg output builds.Several other scenarios are as follows.
  If I enable x264 encoder, I get undefined reference errors to some variables in x264.c (in libavcodec).
  If I enable shared in ffmpeg configure, I get an error which says it can’t cd to my prefix directory (no permission issues by the way).

  I am using latest releases of ffmpeg and x264 (cloned the git today) and ndk 7. Ubuntu runs on VM, installed on Windows 7. For further details about my adventure of ffmpeg/x264 porting to Android, you may refer here.

  What should I do to use libx264 with ffmpeg ? I kept on trying this script with different configurations, removed all ffmpeg x264 folders and reinstalled them, but to no avail.

  Thanks a lot in advance.

  EDIT
  Below is my x264 build script. It builds fine, gives me the static library and the headers.

  export ARM_ROOT=/home/mehmet/Android_NDK_r7b
  
  export ARM_INC=$ARM_ROOT/platforms/android-8/arch-arm/usr/include/
  
  export ARM_LIB=$ARM_ROOT/platforms/android-8/arch-arm/usr/lib/
  
  export ARM_TOOL=$ARM_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
  
  export ARM_LIBO=$ARM_TOOL/lib/gcc/arm-linux-androideabi/4.4.3
  
  export PATH=$ARM_TOOL/bin:$PATH
  
  export PATH=$ARM_TOOL/arm-linux-androideabi/bin:$PATH
  
  export ARM_PRE=arm-linux-androideabi
  
  #tries to build for 4.4.3 toolchain
  
  
  
  ./configure --prefix=./ndk7_build \
  
  --disable-gpac \
  
  --extra-cflags=" -I$ARM_INC -fPIC -DANDROID -fpic -mthumb-interwork -ffunction-sections -funwind-tables -fstack-protector -fno-short-enums -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -Wno-psabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -DANDROID -Wa,--noexecstack -MMD -MP " \
  
  --extra-ldflags=" -nostdlib -Bdynamic -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,nocopyreloc -Wl,-soname,/system/lib/libz.so -Wl,-rpath-link=$ARM_LIB,-dynamic-linker=/system/bin/linker -L$ARM_LIB -nostdlib $ARM_LIB/crtbegin_dynamic.o $ARM_LIB/crtend_android.o -lc -lm -ldl -lgcc " \
  
  --cross-prefix=${ARM_PRE}- \
  
  --disable-asm \
  
  --enable-static \
  
  --host=arm-linux \

  This is what happens on terminal when i enable libx264 encoder.

  STRIP   ffmpeg
  
  INSTALL install-progs-yes
  
  INSTALL ffmpeg
  
  INSTALL ffprobe
  
  libavcodec/libavcodec.a(libx264.o): In function `X264_frame':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:158: undefined reference to `x264_picture_init'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:178: undefined reference to `x264_encoder_reconfig'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:189: undefined reference to `x264_encoder_encode'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:195: undefined reference to `x264_encoder_delayed_frames'
  
  libavcodec/libavcodec.a(libx264.o): In function `encode_nals':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:100: undefined reference to `x264_bit_depth'
  
  libavcodec/libavcodec.a(libx264.o): In function `X264_close':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:230: undefined reference to `x264_encoder_close'
  
  libavcodec/libavcodec.a(libx264.o): In function `X264_init':
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:283: undefined reference to `x264_param_default'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:291: undefined reference to `x264_param_default_preset'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:313: undefined reference to `x264_param_parse'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:448: undefined reference to `x264_param_apply_fastfirstpass'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:451: undefined reference to `x264_param_apply_profile'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:494: undefined reference to `x264_encoder_open_125'
  
  /home/mehmet/ffmpeg/libavcodec/libx264.c:505: undefined reference to `x264_encoder_headers'