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• SIGSEV when loading ffmpeg library

  20 février 2014, par gookman

  I am trying to build ffmpeg for Android similar to AndroidFFmpeg.

  I have configured ffmpeg so that I have only what I need. My android_build.sh looks like
  this :

  #!/bin/bash
  
  
  
  if [ "$NDK" = "" ]; then
  
      echo NDK variable not set, exiting
  
      echo "Use: export NDK=/your/path/to/android-ndk"
  
      exit 1
  
  fi
  
  
  
  OS=`uname -s | tr '[A-Z]' '[a-z]'`
  
  function build_ffmpeg
  
  {
  
      PLATFORM=$NDK/platforms/$PLATFORM_VERSION/arch-$ARCH/
  
      CC=$PREBUILT/bin/$EABIARCH-gcc
  
      CROSS_PREFIX=$PREBUILT/bin/$EABIARCH-
  
      PKG_CONFIG=${CROSS_PREFIX}pkg-config
  
      if [ ! -f $PKG_CONFIG ];
  
      then
  
         cat > $PKG_CONFIG << EOF
  
  #!/bin/bash
  
  pkg-config \$*
  
  EOF
  
         chmod u+x $PKG_CONFIG
  
      fi
  
      NM=$PREBUILT/bin/$EABIARCH-nm
  
      cd ffmpeg
  
      export PKG_CONFIG_LIBDIR=$(pwd)/$PREFIX/lib/pkgconfig/
  
      export PKG_CONFIG_PATH=$(pwd)/$PREFIX/lib/pkgconfig/
  
      ./configure --target-os=linux \
  
          --prefix=$PREFIX \
  
          --enable-small \
  
          --enable-cross-compile \
  
          --extra-libs="-lgcc" \
  
          --arch=$ARCH \
  
          --cc=$CC \
  
          --cross-prefix=$CROSS_PREFIX \
  
          --nm=$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 \
  
          --enable-runtime-cpudetect \
  
          --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -nostdlib -lc -lm -ldl -llog -L$PREFIX/lib" \
  
          --extra-cflags="-I$PREFIX/include" \
  
          --disable-everything \
  
          --enable-muxer=mp4 \
  
          --enable-protocol=file \
  
          --enable-decoder=mpeg4 \
  
          --enable-encoder=mpeg4 \
  
          --enable-avformat \
  
          --enable-avcodec \
  
          --enable-avresample \
  
          --enable-zlib \
  
          --disable-doc \
  
          --disable-ffplay \
  
          --disable-ffmpeg \
  
          --disable-ffplay \
  
          --disable-ffprobe \
  
          --disable-ffserver \
  
          --disable-avdevice \
  
          --enable-nonfree \
  
          --enable-version3 \
  
          --enable-memalign-hack \
  
          --enable-asm \
  
          $ADDITIONAL_CONFIGURE_FLAG \
  
          || exit 1
  
      make clean || exit 1
  
      make -j4 install || exit 1
  
  
  
      cd ..
  
  }
  
  
  
  function build_one {
  
      cd ffmpeg
  
      PLATFORM=$NDK/platforms/$PLATFORM_VERSION/arch-$ARCH/
  
      $PREBUILT/bin/$EABIARCH-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib  -soname $SONAME -shared -nostdlib  -z noexecstack -Bsymbolic --whole-archive --no-undefined -o $OUT_LIBRARY -lavcodec -lavformat -lavresample -lavutil -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker -zmuldefs $PREBUILT/lib/gcc/$EABIARCH/4.6/libgcc.a || exit 1
  
     cd ..
  
  }
  
  
  
  #arm v5
  
  EABIARCH=arm-linux-androideabi
  
  ARCH=arm
  
  CPU=armv5
  
  OPTIMIZE_CFLAGS="-marm -march=$CPU"
  
  PREFIX=../ffmpeg-build/armeabi
  
  OUT_LIBRARY=$PREFIX/libffmpeg.so
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  SONAME=libffmpeg.so
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/$OS-x86_64
  
  PLATFORM_VERSION=android-5
  
  build_ffmpeg
  
  build_one
  
  
  
  #arm v7vfpv3
  
  EABIARCH=arm-linux-androideabi
  
  ARCH=arm
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
  
  PREFIX=../ffmpeg-build/armeabi-v7a
  
  OUT_LIBRARY=$PREFIX/libffmpeg.so
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  SONAME=libffmpeg.so
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/$OS-x86_64
  
  PLATFORM_VERSION=android-5
  
  build_ffmpeg
  
  build_one

  My Android.mk file looks like this :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := ffmpeg-prebuilt
  
  LOCAL_SRC_FILES := ffmpeg-build/$(TARGET_ARCH_ABI)/libffmpeg.so
  
  LOCAL_EXPORT_C_INCLUDES := ffmpeg-build/$(TARGET_ARCH_ABI)/include
  
  LOCAL_EXPORT_LDLIBS := ffmpeg-build/$(TARGET_ARCH_ABI)/libffmpeg.so
  
  LOCAL_PRELINK_MODULE := true
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_ALLOW_UNDEFINED_SYMBOLS=false
  
  LOCAL_MODULE    := native
  
  LOCAL_SRC_FILES := native.c
  
  LOCAL_LDLIBS := -llog
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/ffmpeg-build/$(TARGET_ARCH_ABI)/include
  
  LOCAL_SHARED_LIBRARY := ffmpeg-prebuilt
  
  include $(BUILD_SHARED_LIBRARY)

  The actual code I am trying to use is very simple and looks like this :

  #include 
  
  #include <android></android>log.h>
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  
  
  static jint Java_dk_bendingspoons_clipstitch_VideoLoader_start(JNIEnv * env, jobject thiz, jstring path)
  
  {
  
      __android_log_print(ANDROID_LOG_VERBOSE, "native", "Before register all.");
  
      av_register_all();
  
  
  
      return 0;
  
  }

  The compilation of both ffmpeg and my code is without any errors. The problem is that when I am loading the library in Android it fails with the error : Fatal signal 11 (SIGSEGV) at 0xdeadbaad (code=1), thread 27050. This leads me to believe that there is something that I am doing wrong when compiling.

  I should mention that I am compiling on Ubuntu 13.10 x64 with NDK-r9c-x86_64.

  How should I proceed in finding out what the issue is ?

• Analytics for ePortfolios, Mahara hui conference

  20 mars 2014, par Matthieu Aubry — Community, Meta

  I was privileged to present at the Mahara Hui conference in Wellington, New Zealand.

  Here are the slides of my presentation “Analytics for ePortfolios” :

  Summary : by using an analytics tool that integrates well with Mahara, such as Piwik, Mahara users can benefit from a multitude of insightful analytics reports.

  Learn more

  Mahara is a web application to build your electronic portfolio. You can create journals, upload files, embed social media resources from the web and collaborate with other users in groups. Mahara is a popular open source project built by a passionate community, and used in universities, schools and companies all over the world.

  Mahara Hui is the first kiwi conference on Mahara, the open source ePortfolio system, in New Zealand. This 2-day conference was held at Te Papa in Wellington from 19 to 20 March 2014 (schedule)

  Next steps

  I’m excited to join the Mahara team at the Mahara Hui Hackfest organised today at Catalyst IT offices. We will brainstorm how to integrate Piwik beautifully within Mahara, and how to ultimately provide students and employees useful analytics on all the content they create !

• How to show a watermark for 3 second on a MP4 using FFmpeg

  6 février 2014, par b1izzard

  I need to add a 3-second watermark to a Camera recorded video in Android. I'm using FFmpeg static build to execute the commands.

  Approach I

  I had tried the below command using latest version of FFmpeg(version N-60108-gda25a65) in my Desktop running Linux Mint, the command works fine.

  ffmpeg -y -itsoffset 3 -i input.mp4 -i myImage.jpg -filter_complex "[0:v][1:v]overlay=0:0:enable=between(t\,0\,3)"  -codec:a copy output.mp4

  In Android I'm using the FFmpegv1.2 with below config to execute the command.

   *******Starting FFMPEG
  
      ***ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers***
  
      ***  built on Mar 31 2013 23:44:57 with gcc 4.6 (GCC) 20120106 (prerelease)***
  
      ***  configuration: --arch=arm --target-os=linux --enable-runtime-cpudetect --enable-pic --disable-shared --enable-static --cross-prefix=/opt/android-ndk-r8e/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --sysroot=/opt/android-ndk-r8e/platforms/android-8/arch-arm --extra-cflags='-march=armv6' --extra-ldflags= --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network***
  
      ***  libavutil      52. 18.100 / 52. 18.100***
  
      ***  libavcodec     54. 92.100 / 54. 92.100***
  
      ***  libavformat    54. 63.104 / 54. 63.104***
  
      ***  libavdevice    54.  3.103 / 54.  3.103***
  
      ***  libavfilter     3. 42.103 /  3. 42.103***
  
      ***  libswscale      2.  2.100 /  2.  2.100***
  
      ***  libswresample   0. 17.102 /  0. 17.102***

  Java Code to run the FFmpeg command :

  String[] ffmpegCommandToAddWatermark = { 
  
              mFfmpegInstallPath, "-y", "-itsoffset","3",
  
               "-i", INPUT_VIDEO_PATH, "-i", WATERMARK_IMAGE_PATH,
  
               "-filter_complex","[0:v][1:v]overlay=0:0:between(t\\,0\\,3)",
  
               "-strict","-2",
  
               "-codec:a","copy",OUTPUT_VIDEO_PATH};          
  
          try {
  
          Process ffmpegProcess = new ProcessBuilder(ffmpegCommandToAddWatermark)
  
              .redirectErrorStream(true).start();
  
  
  
          String line;
  
  
  
          BufferedReader reader = new BufferedReader(
  
              new InputStreamReader(ffmpegProcess.getInputStream()));
  
          Log.d(TAG, "*******Starting FFMPEG");
  
          while ((line = reader.readLine()) != null ) {
  
  
  
              Log.d(TAG, "***" + line + "***");
  
          }
  
          Log.d(null, "****ending FFMPEG****");
  
  
  
          } catch (Exception e) {
  
          e.printStackTrace();
  
          }

  The command execution failed with following error :

  ***[overlay @ 0x271f770] No option name near 'between(t,0,3)'***
  
  ***[AVFilterGraph @ 0x2711530] Error initializing filter 'overlay' with args '0:0:between(t,0,3)'***
  
  ***Error configuring filters.***

  The same command executes successfully when :enable=between(t\,0\,3) is removed, but the resulting output video has the watermark throughout the timeline, but I need watermark only for the starting 3 seconds.

  Approach II :

  I tried to convert WaterMarkImage to WaterMarkVideo

  ffmpeg -y -loop 1 -r 30 -i WaterMarkImage.jpg -b:v "4096k" -vf "scale=640:480" -t 3 WaterMarkVideo.mp4

  And then merge the WaterMarkVideo.mp4+CameraRecordedVideo.mp4 using the concat command :

  ffmpeg -y -f concat -i inputs.txt -c copy output.mp4

  The resulting output is corrupt due to BitRate,FrameRate,etc., mismatch. Any idea to solve the problem ?.