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• What do the parameters in LocalMotion in vid.stab mean ? (understanding transforms.trf)

  17 février 2016, par Melanie Sclar

  I’ve been trying to understand the log file transforms.trf in vid.stab. I realized that it’s the local motions in each frame, but I still don’t get all the parameters.

  Looking at the code, in serialize.c I found :

      int storeLocalmotion(FILE* f, const LocalMotion* lm){
  
    return fprintf(f,"(LM %i %i %i %i %i %lf %lf)", lm->v.x,lm->v.y,lm->f.x,lm->f.y,lm->f.size,
  
                   lm->contrast, lm->match);
  
  }

  I imagine (v.x, v.y) is the direction of the motion vector and (f.x, f.y) is the starting point. f.size maybe means the magnitude of the vector (although (v.x, v.y) could have expressed that already), but I have no idea of what match and contrast mean. I think contrast refers to the same concept as the option ’mincontrast’, but I’m not sure what it means.

  Thanks a lot !

• Revision 30797 : On passe en version 0.6 avec tout le code revu et plus ou moins corrigé

  10 août 2009, par kent1@… — Log

  On passe en version 0.6 avec tout le code revu et plus ou moins corrigé

• problems for building FFMPEG library for android on windows

  6 février 2014, par user3275506

  I am developing application for video which supports all formats.
  After much research I came to conclusion that I have to use FFMPEG library
  I have downloaded that I followed some steps I am geting unexpected end of the file.

  #!/usr/bin/env bash
  
  NDK=cygdrive/C/AndroidNDKx86/android-ndk-r9b
  
  SYSROOT=$NDK/platforms/android-18/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows
  
  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=linux \
  
  --arch=arm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  --extra-ldflags="$ADDI_LDFLAGS" \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  
  
  make clean
  
  make -j4
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  Please tell me is the code wrong it gives output unexpected end of file

  I tried another one it was almost compile but during make at the end it got some errors
  Here is the updated script

  #!/bin/bash
  
      export TMPDIR=C:/cygwin/tmp
  
      ANDROID_API=android-18
  
      export ANDROID_NDK=C:/AndroidNDKx86/android-ndk-r9b
  
      export ANDROID_SDK=E:/Android/Android/Data/Android/AndroidADT/sdk
  
      SYSROOT=$ANDROID_NDK/platforms/$ANDROID_API/arch-arm
  
      ANDROID_BIN=$ANDROID_NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows/bin
  
      CROSS_COMPILE=${ANDROID_BIN}/arm-linux-androideabi-
  
      export PATH=$PATH:$ANDROID_SDK/tools:$ANDROID_SDK/platform-tools
  
      export ARM_ROOT=$ANDROID_NDK
  
      export ARM_INC=$ARM_ROOT/platforms/android-18/arch-arm/usr/include
  
      export ARM_LIB=$ARM_ROOT/platforms/android-18/arch-arm/usr/lib
  
      export LIB_INC=${HOME}/include
  
      export LIB_LIB=${HOME}/lib
  
  
  
      FLAGS="--target-os=linux 
  
      --enable-cross-compile 
  
      --cross-prefix=$CROSS_COMPILE 
  
      --arch=arm --prefix=$HOME 
  
      --disable-shared 
  
      --enable-static 
  
      --extra-libs=-static 
  
      --extra-cflags=--static 
  
      --enable-small 
  
      --disable-asm 
  
      --disable-yasm 
  
      --disable-amd3dnow 
  
      --disable-amd3dnowext 
  
      --disable-mmx 
  
      --disable-sse 
  
      --disable-debug
  
      --disable-ssse3 
  
      --disable-indevs"     
  
  ./configure $FLAGS \
  
  --cc="${CROSS_COMPILE}gcc 
  
  --sysroot=${SYSROOT}"  \
  
  --cxx="${CROSS_COMPILE}g++ --sysroot=${SYSROOT}" \
  
  --nm="${CROSS_COMPILE}nm" \
  
  --ar="${CROSS_COMPILE}ar"
  
  make clean
  
  make -j4 || exit 1
  
  make install || exit 1

  Following is the output
  OUTPUT :

  WARNING: C:/AndroidNDKx86/android-ndk-r9b/toolchains/arm-linux-androideabi-
  
  4.8/prebuilt/windows/bin/arm-linux-androideabi-pkg-config not found, library detection 
  
  may fail.
  
  CC      libavdevice/alldevices.o
  
  CC      libavdevice/avdevice.o
  
  CC      libavfilter/af_aconvert.o
  
  In file included from libavdevice/avdevice.c:19:0:
  
  ./libavutil/avassert.h:30:20: fatal error: stdlib.h: No such file or directory
  
   #include 
  
                      ^
  
  compilation terminated.
  
  In file included from libavdevice/alldevices.c:21:0:
  
  ./config.h:8:18: warning: missing terminating " character [enabled by default]
  
   (GCC)"e CC_IDENT "gcc 4.8
  
                    ^
  
  ./config.h:9:7: warning: missing terminating " character [enabled by default]
  
   #define av_restrict restrict
  
         ^
  
  ./config.h:9:2: error: missing terminating " character
  
   #define av_restrict restrict
  
    ^
  
  common.mak:48: recipe for target 'libavdevice/avdevice.o' failed
  
  make: *** [libavdevice/avdevice.o] Error 1
  
  make: *** Waiting for unfinished jobs....
  
  In file included from libavdevice/version.h:28:0,
  
                   from libavdevice/avdevice.h:22,
  
                   from libavdevice/alldevices.c:22:
  
  ./libavutil/avutil.h:120:1: error: expected '=', ',', ';', 'asm' or '__attribute__' 
  
  before 'unsigned'
  
   unsigned avutil_version(void);
  
   ^
  
  In file included from ./libavutil/avutil.h:238:0,
  
                   from libavdevice/version.h:28,
  
                   from libavdevice/avdevice.h:22,
  
                   from libavdevice/alldevices.c:22:
  
  ./libavutil/common.h:29:19: fatal error: errno.h: No such file or directory
  
   #include 
  
                     ^
  
  compilation terminated.
  
  CC      libavfilter/af_afade.o
  
  common.mak:48: recipe for target 'libavdevice/alldevices.o' failed
  
  make: *** [libavdevice/alldevices.o] Error 1
  
  In file included from ./libavutil/channel_layout.h:25:0,
  
                   from libavfilter/af_aconvert.c:29:
  
  c:\androidndkx86\android-ndk-r9b\toolchains\arm-linux-androideabi- 
  
  4.8\prebuilt\windows\lib\gcc\arm-linux-androideabi\4.8\include\stdint.h:9:26: fatal  
  
  error: stdint.h: No such file or directory
  
   # include_next 
  
                            ^
  
  compilation terminated.
  
  common.mak:48: recipe for target 'libavfilter/af_aconvert.o' failed
  
  make: *** [libavfilter/af_aconvert.o] Error 1
  
  In file included from ./libavutil/rational.h:31:0,
  
                   from ./libavutil/opt.h:30,
  
                   from libavfilter/af_afade.c:26:
  
  c:\androidndkx86\android-ndk-r9b\toolchains\arm-linux-androideabi-  
  
  4.8\prebuilt\windows\lib\gcc\arm-linux-androideabi\4.8\include\stdint.h:9:26: fatal    
  
  error: stdint.h: No such file or directory
  
   # include_next 
  
                            ^
  
  compilation terminated.
  
  common.mak:48: recipe for target 'libavfilter/af_afade.o' failed
  
  make: *** [libavfilter/af_afade.o] Error 1

  Is the script wrong ??