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• Can I Config FFMEG-2.4.3 to use in android windows 64 ?

  13 novembre 2014, par Ngo Ky

  I want to build ffmpeg-2.4.3 (lastest c lib) to use it on android for managing video.
  my OS is windows 7 Utimate x64
  cywin64 in directory : C :/cywin64/ have make installed.
  NDK in directory : D :\solfware\Programming\android-ndk-r10c

  i follow toturial form : http://www.roman10.net/how-to-build-ffmpeg-for-android/comment-page-1/
  my project struture like :

  

  i create build_android.sh like roman10 as following code :

  # ARMv7+Neon (Cortex-A8)
  
  # Customizing:
  
  # 1. Feel free to change ./configure parameters for more features
  
  # 2. To adapt other ARM variants
  
  # set $CPU and $OPTIMIZE_CFLAGS 
  
  # call build_one
  
  ######################################################
  
  NDK=D:\solfware\Programming\android-ndk-r10c
  
  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
  PREBUILT=$NDK/prebuilt/windows-x86_64
  
  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=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
  
      --disable-shared \
  
      --enable-static \
  
      --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
      --disable-everything \
  
      --enable-demuxer=mov \
  
      --enable-demuxer=h264 \
  
      --disable-ffplay \
  
      --enable-protocol=file \
  
      --enable-avformat \
  
      --enable-avcodec \
  
      --enable-decoder=rawvideo \
  
      --enable-decoder=mjpeg \
  
      --enable-decoder=h263 \
  
      --enable-decoder=mpeg4 \
  
      --enable-decoder=h264 \
  
      --enable-parser=h264 \
  
      --disable-network \
  
      --enable-zlib \
  
      --disable-avfilter \
  
      --disable-avdevice \
  
      $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 v6
  
  #CPU=armv6
  
  #OPTIMIZE_CFLAGS="-marm -march=$CPU"
  
  #PREFIX=./android/$CPU 
  
  #ADDITIONAL_CONFIGURE_FLAG=
  
  #build_one
  
  
  
  #arm v7vfpv3
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  PREFIX=./android/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one
  
  
  
  #arm v7vfp
  
  #CPU=armv7-a
  
  #OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
  
  #PREFIX=./android/$CPU-vfp
  
  #ADDITIONAL_CONFIGURE_FLAG=
  
  #build_one
  
  
  
  #arm v7n
  
  #CPU=armv7-a
  
  #OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mtune=cortex-a8"
  
  #PREFIX=./android/$CPU 
  
  #ADDITIONAL_CONFIGURE_FLAG=--enable-neon
  
  #build_one
  
  
  
  #arm v6+vfp
  
  #CPU=armv6
  
  #OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP -mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU"
  
  #PREFIX=./android/${CPU}_vfp 
  
  #ADDITIONAL_CONFIGURE_FLAG=
  
  #build_one

  i have set my path like above
  I built it in Eclipse Everything is ok. but when i ran it in Android it crashed Unfortunately.
  I found the errors in Logcat monitor :

  E/AndroidRuntime(1931) : java.lang.UnsatisfiedLinkError : Couldn’t load avcodec-55 from loader dalvik.system.PathClassLoader[DexPathList [1]] : findLibrary returned null

  E/AndroidRuntime(1931) : at java.lang.Runtime.loadLibrary(Runtime.java:358)

  In my activity i just call add Library from C preference like :

  static {
  
          //System.loadLibrary("avutil-52");
  
          System.loadLibrary("avcodec-55");
  
          System.loadLibrary("avformat-55");
  
          System.loadLibrary("swscale-2");
  
          System.loadLibrary("tutorial02");
  
      }

  i check in DDMS in app-lib there is no existing Library in there.

  The question is : Can i can compile the ffmpeg on windows ?
  if ok. how can i config build_android.sh to point to Android $PREBUILT

  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
      PREBUILT=$NDK/prebuilt/windows-x86_64
  
      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=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
  
          --disable-shared \

  i found that in $NDK/prebuilt/windows-x86_64/bin did not exist arm-linux-androideabi-gcc\
  How can i config to be suitable to run on windows ?

  Thank in advanced

• Video Conferencing in HTML5 : WebRTC via Socket.io

  
  1er janvier 2014, par silvia

  Six months ago I experimented with Web sockets for WebRTC and the early implementations of PeerConnection in Chrome. Last week I gave a presentation about WebRTC at Linux.conf.au, so it was time to update that codebase.

  I decided to use socket.io for the signalling following the idea of Luc, which made the server code even smaller and reduced it to a mere reflector :

   var app = require(’http’).createServer().listen(1337) ;
   var io = require(’socket.io’).listen(app) ;
   io.sockets.on(’connection’, function(socket) 
  
           socket.on(’message’, function(message) 
  
           socket.broadcast.emit(’message’, message) ;
  
       ) ;
  
   ) ;
  

  Then I turned to the client code. I was surprised to see the massive changes that PeerConnection has gone through. Check out my slide deck to see the different components that are now necessary to create a PeerConnection.

  I was particularly surprised to see the SDP object now fully exposed to JavaScript and thus the ability to manipulate it directly rather than through some API. This allows Web developers to manipulate the type of session that they are asking the browsers to set up. I can imaging e.g. if they have support for a video codec in JavaScript that the browser does not provide built-in, they can add that codec to the set of choices to be offered to the peer. While it is flexible, I am concerned if this might create more problems than it solves. I guess we’ll have to wait and see.

  I was also surprised by the need to use ICE, even though in my experiment I got away with an empty list of ICE servers – the ICE messages just got exchanged through the socket.io server. I am not sure whether this is a bug, but I was very happy about it because it meant I could run the whole demo on a completely separate network from the Internet.

  The most exciting news since my talk is that Mozilla and Google have managed to get a PeerConnection working between Firefox and Chrome – this is the first cross-browser video conference call without a plugin ! The code differences are minor.

  Since the specification of the WebRTC API and of the MediaStream API are now official Working Drafts at the W3C, I expect other browsers will follow. I am also looking forward to the possibilities of :

  • multi-peer video conferencing like the efforts around webrtc.io,
  • the media stream recording API,
  • and the peer-to-peer data API.

  The best places to learn about the latest possibilities of WebRTC are webrtc.org and the W3C WebRTC WG. code.google.com has open source code that continues to be updated to the latest released and interoperable features in browsers.

  The video of my talk is in the process of being published. There is a MP4 version on the Linux Australia mirror server, but I expect it will be published properly soon. I will update the blog post when that happens.

• ASP.net swf game file preview (thumbnail)

  12 avril 2015, par Moatasem bakri

  Scenario :

  I really in need for your help.
  I have multiple swf game files which I want to view them on the page as thumbnails and let the visitor click on it to play the game.

  Required :

  I want a tool that let make take a thumbnail from swf file, maybe the first frame of the file as image to view it.

  maybe if there another way to preview the files in asp.net pages without the need to the following way could be better.

  Bad news

  I have viewed all the possible answers on StackOverFlow and even on Google but with no luck, they lead my to the following :

  • use : https://swf.codeplex.com/ : I have tried it and now result
  • use ffmpeg : but the feature is not available yet, and I’m getting the following error
    ’swf : could not find codec parameters’