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• How to Add Gstreamer Plugin on Mac when installed from Tutorials

  31 juillet 2014, par Dave Collins

  I basically have two installs of gstreamer on my Mac OS X machine :
  The one that works perfectly was installed following this tutorial (http://docs.gstreamer.com/display/GstSDK/Installing+on+Mac+OS+X) and downloading and installing the Developer SDK and using XCode. All tutorials work well.

  I also have a local version installed with Homebrew but video playback does not work on that version (see SO : gstreamer gst-launch sample mac osx plays audio but not video)

  SO, I’m trying to install the FFMPEG plugin into the working xcode dev system so that I can use FFDEC_H263 in a project.

  I tried simply copying the related .SO files (e.g. libgstffmpg.so) from the homebrew (cellar) location to the

   /Library/Frameworks/GStreamer.Framework/Versions/0.10/lib/gstreamer-0.10/ 

  directory and changing permissions. However, that gives me a "Caught a segmentation fault while loading plugin file" error when building any code.

  I also noticed that in the Xcode directory mentioned above, all of the plugins have a related .a and .la files in the \static subdirectory... Those same files don’t exist in the homebrew version.

  So, what is the proper way to install a plugin when you’ve started with the developer SDK for Mac OSX ?

• Android - Integrating ffmpeg and android-ndk-r9c

  16 juillet 2015, par lgdroid57

  I have seen a lot of posts about FFmpeg and using FFmpeg in Android, but I am finding that a majority of these posts are for older versions of either FFmpeg or Android NDK. I was able to get a result from https://github.com/mconf/android-ffmpeg, which includes the files : "libavcodec.so", "libavformat.so", "libavutil.so", "libswscale.so". However, simply adding these files to my project does not seem to be enough to use FFmpeg. (I followed http://stackoverflow.com/a/21773572/1877798 as a reference guide). It’s possible that either I’ve done something wrong in configuring these files in my project, or I’ve done something wrong in building FFmpeg for Android. (Should there be more files ?)

  I was wondering if there are any recent guides for building or integrating FFmpeg in an Android project. I am using FFmpeg (as of 2/27/14) and Android NDK 9c.
  If not, does anyone have other recommendations for other libraries ? I am trying to take a set of image files and create a video/animated gif programatically.

  Thanks ! :-)

   EDIT 

  I have found http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/comment-page-4/ and a couple others found on GitHub. However, they all seem to struggle in building FFmpeg. I am using Mac OS X

  Here is my script :

  #!/bin/bash
  
  NDK=/Downloads/android-ndk-r9c
  
  SYSROOT=$NDK/platforms/android-18/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64
  
  # Note: Change the TOOLCHAIN to match that available for your host system.
  
  # darwin-x86_64 is for Mac OS X, but you knew that.
  
  function build_one
  
  {
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --enable-shared \
  
      --disable-static \
  
      --disable-doc \
  
      --disable-programs \
  
      --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
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU 
  
  ADDI_CFLAGS="-marm"
  
  build_one

  Here is the log :

  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-        dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/c++/4.2.1
  
  Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/c++/4.2.1
  
  /Downloads/android-ndk-r9c/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solving the problem.
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:48: /common.mak: No such file or directory
  
  Makefile:91: /libavutil/Makefile: No such file or directory
  
  Makefile:91: /library.mak: No such file or directory
  
  Makefile:168: /doc/Makefile: No such file or directory
  
  Makefile:169: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:48: /common.mak: No such file or directory
  
  Makefile:91: /libavutil/Makefile: No such file or directory
  
  Makefile:91: /library.mak: No such file or directory
  
  Makefile:168: /doc/Makefile: No such file or directory
  
  Makefile:169: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:48: /common.mak: No such file or directory
  
  Makefile:91: /libavutil/Makefile: No such file or directory
  
  Makefile:91: /library.mak: No such file or directory
  
  Makefile:168: /doc/Makefile: No such file or directory
  
  Makefile:169: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.

• FFMpeg integration with iOS 7

  2 janvier 2014, par metsburg

  I am trying to integrate FFMpeg with iOS 7.

  My objective is to decode a video stream which is coming in through H.264 video codec.

  I've built the FFMpeg library using methodology described here : Trying to compile the FFMPEG libraries for iPhoneOS platform with armv6 and arv7 architecture

  When I compile using :

  ./configure 
  
  --prefix=armv7 
  
  --disable-ffmpeg 
  
  --disable-ffplay 
  
  --disable-ffprobe 
  
  --disable-ffserver 
  
  --enable-avresample 
  
  --enable-cross-compile 
  
  --sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk" 
  
  --target-os=darwin 
  
  --cc="/usr/llvm-gcc-4.2/bin/llvm-gcc-4.2" 
  
  --extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-min=6.1" 
  
  --extra-ldflags="-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -miphoneos-version-min=7.0" 
  
  --arch=arm --cpu=cortex-a9 --enable-pic

  all the *.a files do not get generated.

  I'm trying to create a sample FFMpeg project, as described in http://sol3.typepad.com/exotic_particles/2012/10/building-a-simple-frame-recorder-part-1.html?cid=6a00d8343a141353ef019b01f49c8e970d#comment-6a00d8343a141353ef019b01f49c8e970d

  However, I keep getting the following error while trying to build the project :

  Undefined symbols for architecture i386:
  
  
  
    "_av_close_input_file", referenced from:
  
  
  
        -[FrameExtractor dealloc] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_av_find_stream_info", referenced from:
  
  
  
        -[FrameExtractor initWithVideo:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_av_free", referenced from:
  
  
  
        -[FrameExtractor dealloc] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_av_free_packet", referenced from:
  
  
  
        -[FrameExtractor stepFrame] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_av_open_input_file", referenced from:
  
  
  
        -[FrameExtractor initWithVideo:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_av_read_frame", referenced from:
  
  
  
        -[FrameExtractor stepFrame] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_av_register_all", referenced from:
  
  
  
        -[FrameExtractor initWithVideo:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avcodec_alloc_frame", referenced from:
  
  
  
        -[FrameExtractor initWithVideo:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avcodec_close", referenced from:
  
  
  
        -[FrameExtractor dealloc] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avcodec_decode_video2", referenced from:
  
  
  
        -[FrameExtractor stepFrame] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avcodec_find_decoder", referenced from:
  
  
  
        -[FrameExtractor initWithVideo:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avcodec_flush_buffers", referenced from:
  
  
  
        -[FrameExtractor seekTime:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avcodec_open", referenced from:
  
  
  
        -[FrameExtractor initWithVideo:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avcodec_register_all", referenced from:
  
  
  
        -[FrameExtractor initWithVideo:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avformat_seek_file", referenced from:
  
  
  
        -[FrameExtractor seekTime:] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avpicture_alloc", referenced from:
  
  
  
        -[FrameExtractor setupScaler] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_avpicture_free", referenced from:
  
  
  
        -[FrameExtractor setupScaler] in FFmpegDecoder(FrameExtractor.o)
  
  
  
        -[FrameExtractor dealloc] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_sws_freeContext", referenced from:
  
  
  
        -[FrameExtractor setupScaler] in FFmpegDecoder(FrameExtractor.o)
  
  
  
        -[FrameExtractor dealloc] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_sws_getContext", referenced from:
  
  
  
        -[FrameExtractor setupScaler] in FFmpegDecoder(FrameExtractor.o)
  
  
  
    "_sws_scale", referenced from:
  
  
  
        -[FrameExtractor convertFrameToRGB] in FFmpegDecoder(FrameExtractor.o)
  
  
  
  ld: symbol(s) not found for architecture i386
  
  
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

  Please help.