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• Merge commit ’3ec6f855d0f21d90a0494fb798c4cf203fdb3db0’

  27 mars 2017, par Clément Bœsch

  Merge commit ’3ec6f855d0f21d90a0494fb798c4cf203fdb3db0’
  * commit ’3ec6f855d0f21d90a0494fb798c4cf203fdb3db0’ :
  
    srt : Adjust signedness of sscanf format strings
  This commit is a noop, a different fix is included in the big -Wformat
  
  patch under review
  
  (http://ffmpeg.org/pipermail/ffmpeg-devel/2017-March/209239.html)
  Merged-by : Clément Bœsch <u@pkh.me>
  

• Image sequence to video stream ?

  22 août 2015, par Hauns TM

  Like many people already seem to have (there are several threads on this subject here) I am looking for ways to create video from a sequence of images.

  I want to implement my functionality in C# !

  Here is what I wan’t to do :

  /*Pseudo code*/
  
  void CreateVideo(List<image> imageSequence, long durationOfEachImageMs, string outputVideoFileName, string outputFormat)
  
  {
  
      // Info: imageSequence.Count will be > 30 000 images
  
      // Info: durationOfEachImageMs will be &lt; 300 ms
  
  
  
      if (outputFormat = "mpeg")
  
      {
  
      }
  
      else if (outputFormat = "avi")
  
      {      
  
      }
  
      else
  
      {
  
      }
  
  
  
      //Save video file do disk
  
  }
  
  </image>

  I know there’s a project called Splicer (http://splicer.codeplex.com/) but I can’t find suitable documentation or clear examples that I can follow (these are the examples that I found).

  The closest I want to do, which I find here on CodePlex is this :
  How can I create a video from a directory of images in C# ?

  I have also read a few threads about ffmpeg (for example this : C# and FFmpeg preferably without shell commands ? and this : convert image sequence using ffmpeg) but I find no one to help me with my problem and I don’t think ffmpeg-command-line-style is the best solution for me (because of the amount of images).

  I believe that I can use the Splicer-project in some way (?).

  In my case, it is about about > 30 000 images where each image should be displayed for about 200 ms (in the videostream that I want to create).

  (What the video is about ? Plants growing ...)

  Can anyone help me complete my function ?

• Linker error when compiling ffmpeg for Android

  7 novembre 2011, par Satheesh

  I have try to implement the ffmpeg decoding library in my android project.Dowload FFmpeg.I got the ffmpeg library from the bambuser client version and unpack that into the project jni folder.Then i run the extract command(./extract.sh) in cygwin compiler tool(its becoz am using windows os) after that am trying to build ffmpeg library using the command ./build.sh

  I have googled a lot but i cant make it work. Please help me out from this.

  NDK version : NDKr5b Cygwin tool version : 1.7

  My build.sh file is

  /************Command starts here******************/
  
  
  
   #!/bin/bash
  
  
  
  if [ "$NDK" = "" ]; then
  
      echo NDK variable not set, assuming ${HOME}/android-ndk
  
      export NDK=${HOME}/android-ndk
  
  fi
  
  
  
  SYSROOT=$NDK/platforms/android-8/arch-arm
  
   # Expand the prebuilt/* path into the correct one
  
  TOOLCHAIN=`echo $NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows`
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  
  
  rm -rf build/ffmpeg
  
  mkdir -p build/ffmpeg
  
  cd ffmpeg
  
  
  
   # Don't build any neon version for now
  
  for version in armv5te armv7a
  
  do
  
  
  
      DEST=../build/ffmpeg
  
      FLAGS="--target-os=linux --arch=arm"
  
      FLAGS="$FLAGS --cross-prefix=arm-linux-androideabi- --arch=arm"
  
      FLAGS="$FLAGS --sysroot=$SYSROOT"
  
      FLAGS="$FLAGS --soname-prefix=/data/data/org.rifluxyss.androiddev.livewallpapaerffmpeg/lib/"
  
      FLAGS="$FLAGS --enable-cross-compile --cc=$TOOLCHAIN/bin/arm-linux-androideabi-gcc"
  
      FLAGS="$FLAGS --enable-shared --disable-symver"
  
      FLAGS="$FLAGS --nm=$TOOLCHAIN/bin/arm-linux-androideabi-nm"
  
      FLAGS="$FLAGS --ar=$TOOLCHAIN/bin/arm-linux-androideabi-ar"
  
      FLAGS="$FLAGS --ranlib=$TOOLCHAIN/bin/arm-linux-androideabi-ranlib"
  
      FLAGS="$FLAGS --enable-small --optimization-flags=-O2"
  
      FLAGS="$FLAGS --enable-encoder=mpeg2video --enable-encoder=nellymoser --enable-memalign-hack "
  
      FLAGS="$FLAGS --disable-ffmpeg --disable-ffplay"
  
      FLAGS="$FLAGS --disable-ffserver --disable-ffprobe --disable-encoders"
  
      FLAGS="$FLAGS --disable-muxers --disable-devices --disable-protocols"
  
      FLAGS="$FLAGS --enable-protocol=file --enable-avfilter"
  
      FLAGS="$FLAGS --disable-network --enable-pthreads --enable-avutil"
  
      FLAGS="$FLAGS --disable-avdevice --disable-asm --extra-libs=-lgcc"
  
  
  
      case "$version" in
  
          neon)
  
              EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon"
  
              EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
              # Runtime choosing neon vs non-neon requires
  
              # renamed files
  
              ABI="armeabi-v7a"
  
              ;;
  
          armv7a)
  
              EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp"
  
              EXTRA_LDFLAGS=""
  
              ABI="armeabi-v7a"
  
              ;;
  
          *)
  
              EXTRA_CFLAGS=""
  
              EXTRA_LDFLAGS=""
  
              ABI="armeabi"
  
              ;;
  
      esac
  
      DEST="$DEST/$ABI"
  
      FLAGS="$FLAGS --prefix=$DEST"
  
  
  
      mkdir -p $DEST
  
      echo $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" > $DEST/info.txt
  
      ./configure $FLAGS --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS" | tee $DEST/configuration.txt
  
      [ $PIPESTATUS == 0 ] || exit 1
  
      make clean
  
      make -j4 || exit 1
  
      make install || exit 1
  
  
  
  done
  
  
  
  /****************Command ends here************************/

  While compiling this am getting error when linking the archive files into .so files.

  The error is look like
  "arm-linux-androideabi/bin/ld.exe : cannot find -lavutil
  Collect2:ld returned 1 exit status
  make :[libaswscale/libswscale.so] Error 1
  make : waititng for unfinished jobs...."

  Please anyone help me to out from this. Thanks in advance