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• Add assembly support for -fsanitize=hwaddress tagged globals.

  21 août 2019, par Peter Collingbourne

  Add assembly support for -fsanitize=hwaddress tagged globals.
  As of LLVM r368102, Clang will set a pointer tag in bits 56-63 of the
  
  address of a global when compiling with -fsanitize=hwaddress. This requires
  
  an adjustment to assembly code that takes the address of such globals : the
  
  code cannot use the regular R_AARCH64_ADR_PREL_PG_HI21 relocation to refer
  
  to the global, since the tag would take the address out of range. Instead,
  
  the code must use the non-checking (_NC) variant of the relocation (the
  
  link-time check is substituted by a runtime check).
  This change makes the necessary adjustment in the movrel macro, where it is
  
  needed when compiling with -fsanitize=hwaddress.
  Signed-off-by : Peter Collingbourne <pcc@google.com>
  
  Reviewed-by : Martin Storsjö
  
  Reviewed-by : Janne Grunau
  

  • [DH] libavutil/aarch64/asm.S

• Compiling FFMPEG with x265 has ERROR : x265 not found using pkg-config

  23 mars 2023, par timweiliu

  At first, I have a project with ffmpeg build support x264 for android in Mac OS.

  



  Now, I want to add x265 support.

  



  I have compiled the x265 with make & make install like this :

  



  [ 81%] Built target x265-static
[100%] Built target cli
Install the project...
-- Install configuration: "Release"
-- Up-to-date: /usr/local/lib/libx265.a
-- Up-to-date: /usr/local/include/x265.h
-- Up-to-date: /usr/local/include/x265_config.h
-- Up-to-date: /usr/local/lib/pkgconfig/x265.pc
-- Up-to-date: /usr/local/bin/x265


  



  and then, I run this shell script :

  



  make distclean 

NDK_PATH=$NDK_HOME
NDK_ARM_PATH=${NDK_PATH}/platforms/android-9/arch-arm
NDK_ARM_BIN_PATH=${NDK_PATH}/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin

CC=${NDK_ARM_BIN_PATH}/arm-linux-androideabi-gcc

chmod +x configure
chmod +x version.sh

if [ $APP_ABI = "armeabi-v7a" ]; then
LOCAL_CFLAGS="-O3 -DANDROID -fpic -I/usr/local/include -march=armv7-a -mfloat-abi=softfp -mfpu=neon"
ABLES="--enable-asm --enable-thumb --enable-hwaccels --cpu=armv7-a --enable-neon"
elif [ $APP_ABI = "armeabi" ]; then
LOCAL_CFLAGS="-O3 -DANDROID -fpic -I/usr/local/include"
ABLES="--disable-neon"
fi
echo $LOCAL_CFLAGS
echo $ABLES
echo $PKG_CONFIG_PATH

echo "开始configure"
./configure \
--disable-yasm \
--disable-debug \
--disable-doc \
--disable-ffmpeg \
--disable-ffprobe \
--disable-ffplay \
--disable-ffserver \
--disable-stripping \
--disable-avdevice \
--disable-postproc \
--disable-network \
--enable-pthreads \
--enable-small \
--disable-encoders \
--enable-encoder=libx264 \
--enable-encoder=libfdk_aac \
--enable-libx265 \
--pkg-config-flags="--static" \
...

echo "开始make"
make -j4

echo "开始install"
sudo make install


  



  It results in an error :

  



  -O3 -DANDROID -fpic -I/usr/local/include -march=armv7-a -mfloat-abi=softfp -mfpu=neon
--enable-asm --enable-thumb --enable-hwaccels --cpu=armv7-a --enable-neon
/usr/local/lib/pkgconfig
开始configure
ERROR: x265 not found using pkg-config


  



  I looked at the config.log :

  



  use_pkg_config x265 x265.h x265_api_get
check_pkg_config x265 x265.h x265_api_get
false --exists --print-errors x265
ERROR: x265 not found using pkg-config


  



  but, the file of x265.pc is existing on the path. Its content is :

  



  prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: x265
Description: H.265/HEVC video encoder
Version: 0.0
Libs: -L${libdir} -lx265
Libs.private: -lstdc++ -lm -lgcc -ldl -lgcc -ldl
Cflags: -I${includedir}


  



  and the x265.h is in include path too.

  



  I run

  



  pkg-config --list-all


  



  It also finds x265 :

  



  TIMWEILIU-MC0:libSrc timweiliu$ pkg-config --list-all
libecpg_compat libecpg_compat - PostgreSQL libecpg_compat library
fdk-aac        Fraunhofer FDK AAC Codec Library - AAC codec library
apr-1          APR - The Apache Portable Runtime library
apr-util-1     APR Utils - Companion library for APR
libpq          libpq - PostgreSQL libpq library
libpcre        libpcre - PCRE - Perl compatible regular expressions C library with 8 bit character support
libpgtypes     libpgtypes - PostgreSQL libpgtypes library
libecpg        libecpg - PostgreSQL libecpg library
x264           x264 - H.264 (MPEG4 AVC) encoder library
x265           x265 - H.265/HEVC video encoder
libpcreposix   libpcreposix - PCREPosix - Posix compatible interface to libpcre
libiodbc       iODBC - iODBC Driver Manager


  



  Now, I don’t know why it does not work.
Why does pkg-config still not find the x265 ?

  


• FFmpeg : H.265/HEVC - does not work on Sony Smart-TV if you change encoder

  25 juillet 2019, par oigen90

  We have such Sony Bravia Smart-TV devices :

  • Sony KD-49XD7005 (2016) - Android
  • Sony KD-49XE7096 (2017) - Linux

  Those devices does have HEVC support, as well as 4K support.

  Also, we have a one minute Apple ProRes 4K video file. I need to transcode it into HEVC with some simple params, create DASH manifest and stream it into HTML5-player.
  The problem is that if I use the regular ’libx265’ codec passing it after "-c:v" - the video does not play on Sony Bravia (just freezes on ’loadstart’ player’s event). But if I use ’hevc_nvenc’ - it works ! What’s the reason of such behavior ? Both of codecs should work identically, hevc_nvenc just should be faster and was made to work on nvidia graphic cards (that’s all I know about those codecs’ difference so far). But in fact we have working stream encoded into hevc_nvenc and invalid stream encoded into libx265.

  See my FFmpeg command below.

  Which thoughts do you have ? If you want me to provide some more info - feel free to ask.

  ffmpeg -i input.mov -c:v hevc_nvenc -pix_fmt yuv420p -b:v 12000k -maxrate 14000k -bufsize 6000k -c:a copy -f mp4 output.mp4