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• resize video using ffmpeg compiled for android libraries [closed]

  19 juillet 2012, par SergeyD

  In my native android project I need to reduce a size of video file.

  I've already built ffmpeg shared/static libraries, but I don't have any idea how to use it. Most of examples for ffmpeg usage are for command line.
  So, can anybody provide me sample code or ffmpeg tutorials link of how to integrate these libraries into my project and use them.

  I'm working with Windows7, Eclipse IDE, cygwin.

  Thanks in advance !

• Compiling ffmpeg for use in Android (ndk) for x86 architecture

  26 septembre 2012, par Ankur22

  I am trying to compile ffmpeg for Android but for the x86 architecture. I've successfully compiled an arm .so and it all works, and I though that by replacing arm with x86 in the relevant places within the build script would have done the trick. Unfortunately that's not the case and I get some strange things occurring.

  First I get this while it's compiling ffmpeg :

  /home/ankur/android-ndk-r8/platforms/android-8/arch-arm//usr/include/strings.h:49: warning: redundant redeclaration of 'index'

  Notice the arch-arm instead of arch-x86. Finally I get this :

  /home/ankur/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-ld: libavcodec/libavcodec.a(4xm.o): Relocations in generic ELF (EM: 40)
  
  /home/ankur/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-ld: libavcodec/libavcodec.a(4xm.o): Relocations in generic ELF (EM: 40)
  
  /home/ankur/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-ld: libavcodec/libavcodec.a(4xm.o): Relocations in generic ELF (EM: 40)
  
  libavcodec/libavcodec.a(4xm.o): could not read symbols: File in wrong format

  The build script I've created looks like this :

  #!/bin/bash
  
  
  
  NDK=~/android-ndk-r8
  
  PLATFORM=$NDK/platforms/android-8/arch-x86/
  
  PREBUILT=$NDK/toolchains/x86-4.4.3/prebuilt/linux-x86
  
  function build_one_r8
  
  {
  
  ./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/i686-android-linux- \
  
      --enable-cross-compile \
  
      --target-os=linux \
  
      --extra-cflags="-I$PLATFORM/usr/include" \
  
      --arch=x86 \
  
      --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/i686-android-linux-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/i686-android-linux-ld -rpath-link=$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/i686-android-linux/4.4.3/libgcc.a
  
  }
  
  function build_one_r8_2
  
  {
  
  $PREBUILT/bin/i686-android-linux-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/i686-android-linux-ld -rpath-link=$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/i686-android-linux/4.4.3/libgcc.a
  
  }
  
  #x86
  
  CPU=x86
  
  OPTIMIZE_CFLAGS="-march=$CPU "
  
  PREFIX=./android/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one_r8

  I hope I'm doing something wrong rather than this not being possible.

  Thanks !

• to create video from image sequence on android

  4 juin 2012, par preceptron

  I want to create video from image sequence (on android) by this code :

      opencv_core.IplImage image = cvLoadImage("/sdcard/mytest/testimage.jpg");
  
      FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("/sdcard/mytest/test.3gp",256,256);
  
      try {
  
          recorder.setCodecID( CODEC_ID_H263);
  
          recorder.setFormat("3gp");
  
          recorder.setPixelFormat(  PIX_FMT_YUV420P);
  
          recorder.start();
  
          for (int i=0;i<10;i++)
  
            {
  
              recorder.record(image);
  
            }
  
          recorder.stop();
  
         }
  
      catch (Exception e){
  
          e.printStackTrace();
  
        }

  But instead of my image I have got green screen. What I have to change in my code ?

  And how I can add audio to my video ?