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• lavc/aacenc_utils : replace powf(x,y) by expf(logf(x), y)

  8 mars 2016, par Ganesh Ajjanagadde

  lavc/aacenc_utils : replace powf(x,y) by expf(logf(x), y)
  This is 2x faster for y not an integer on Haswell+GCC, and should
  
  generally be faster due to the fact that anyway powf essentially does
  
  this under the hood. Made an inline function in lavu/internal.h for this
  
  purpose.
  Note that there are some accuracy differences, that should generally be
  
  negligible. In particular, FATE still passes on this platform.
  Results in 7% speedup in aac encoding with -march=native, Haswell+GCC.
  
  before :
  
  ffmpeg -i sin.flac -acodec aac -y sin_new.aac  6.05s user 0.06s system 104% cpu 5.821 total
  after :
  
  ffmpeg -i sin.flac -acodec aac -y sin_new.aac  5.67s user 0.03s system 105% cpu 5.416 total
  This is also faster than an alternative approach that pulls in powf, gets rid of
  
  the crufty NaN checks and other special cases, exploits knowledge about the intervals, etc.
  
  This of course does not exclude smarter approaches ; just suggests that
  
  there would need to be significant work on this front of lower utility than
  
  searches for hotspots elsewhere.
  Reviewed-by : Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  
  Reviewed-by : Ronald S. Bultje <rsbultje@gmail.com>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanag@gmail.com>
  

  • [DH] libavcodec/aacenc_utils.h
  • [DH] libavutil/internal.h

• libffmpeg.so Not Executing ffmpeg 2.8.4 Commands

  27 janvier 2016, par Chirag Darji
  • libffmpeg.so is not working with command line arguments
  • I have successfully compiles ffmpeg and get static libffmpeg.so library.
  • I installed using android.mk and its installed successfully

  • but unable to execute ffmpeg command.

    *My build.sh is as follows 
    
    function build_r8b_test
    
    {
    
    bash configure --target-os=linux \
    
    --arch=arm \
    
    --cpu=cortex-a8 \
    
    --enable-runtime-cpudetect \
    
    --prefix=$PREFIX \
    
    --enable-pic \
    
    --disable-shared \
    
    --enable-static \
    
    --enable-cross-compile \
    
    --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
    
    --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
    
    --sysroot="$PLATFORM" \
    
    --extra-cflags="-I../x264 -mfloat-abi=softfp -mfpu=neon -fPIE -pie -fPIC -DANDROID -marm -march=armv7-" \
    
    --extra-ldflags="-L../x264 -L$PREBUILT/lib/gcc/arm-linux-androideabi/4.9" \
    
    --extra-libs="-lgcc" \
    
    --enable-gpl \
    
    --enable-version3 \
    
    --enable-nonfree \
    
    --disable-doc \
    
    --enable-yasm \
    
    --enable-decoders \
    
    --enable-encoders \
    
    --enable-muxers \
    
    --enable-demuxers \
    
    --enable-parsers \
    
    --enable-protocols \
    
    --enable-filters \
    
    --disable-indevs \
    
    --disable-outdevs \
    
    --enable-hwaccels \
    
    --disable-ffmpeg \
    
    --disable-ffplay \
    
    --disable-ffprobe \
    
    --disable-ffserver \
    
    --disable-network \
    
    --enable-zlib \
    
    --enable-demuxer=mov \
    
    --enable-demuxer=h264 \
    
    --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 \
    
    --enable-encoder=mpeg4 \
    
    --disable-asm \
    
    --enable-neon \
    
    --enable-armv5te \
    
    --disable-network \
    
    --enable-avfilter \
    
    --disable-avdevice \
    
    --enable-postproc \
    
    
    
    $ADDITIONAL_CONFIGURE_FLAG
    
    make clean
    
    make
    
    make  -j4 install
    
    $PREBUILT/bin/arm-linux-androideabi-ld -rpath-          link=$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 libavfilter/libavfilter.a libpostproc/libpostproc.a libswresample/libswresample.a libswscale/libswscale.a   -lc -lm -lz -ldl -llog  --warn-search-mismatch  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.9/libgcc.a
    
    }
    
    #arm v7vfpv3
    
    CPU=armv7-a
    
    OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
    
    PREFIX=./android/$CPU
    
    ADDITIONAL_CONFIGURE_FLAG=
    
    build_r8b_test
    
    
    
    * and my androi.mk is as follow
    
    LOCAL_PATH := $(call my-dir)
    
    APP_ABI := armeabi-v7a
    
    include $(CLEAR_VARS)
    
    LOCAL_MODULE =myffmpeg
    
    LOCAL_SRC_FILES :=libffmpeg.so
    
    include $(PREBUILT_SHARED_LIBRARY)
    
    include $(CLEAR_VARS)
    
    PATH_TO_FFMPEG_SOURCE:=$(LOCAL_PATH)/ffmpeg
    
    LOCAL_C_INCLUDES += $(PATH_TO_FFMPEG_SOURCE)
    
    LOCAL_MODULE=ffmpeg-jni
    
    LOCAL_LDLIBS := -L/home/admin/android-sdk-linux/ndk-bundle/platforms/android-21/arch-arm/usr/lib -L$(LOCAL_PATH) -llog -ljnigraphics -lz -ldl -lgcc -lm
    
    LOCAL_SRC_FILES := ffmpeg-jni.c ffmpeg/cmdutils.h ffmpeg/cmdutils.c ffmpeg/ffmpeg.h ffmpeg/ffmpeg_opt.c ffmpeg/ffmpeg_filter.c
    
    
    
    LOCAL_SHARED_LIBRARIES:=myffmpeg
    
    include $(BUILD_SHARED_LIBRARY)

    • I have successfully installed armeabi obj and armeabi-v7a
      But it is not works simple ffmpeg command like (ffmpeg -y -i /mnt/sdcard/app.mp4 /mnt/sdcard/app.mkv).
      Applciation is terminate at ret = ffmpeg_parse_options(argc, argv) ; in ffmpeg-jni.c
      which is copied from ffmpeg.c.
      If i am doing wrond build please help me to get out this.

• Fast Video Streaming and Upload Android

  6 avril 2016, par vminind

  Fast Streaming & Uploading Videos On Mobile Apps with AWS S3

  Im developing a app witch has Android, iOS Clients were users can upload videos and photos and view as news feed. I store my video file on Amazone s3. Video length is limited to 30sec.

  When user is uploading 30 sec video from their gallery there are some high quality videos witch is even exceed 100MB so those video files take ages to upload. So i tried to convert them before upload using ffmpeg-android library but it also take almost same amount of time to convert the file so it seems this solution also point less. (convert in the scene reducing the video resolution and frame rate)

  Im using ExoPlayer to play videos

  Note : Videos uploading from iOS are not that huge files.

  I want videos to upload fast and stream fast. Its big help if anyone can share their thoughts on this.