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• avcodec/av1dec : partially clean state on frame decoding errors

  4 octobre 2020, par James Almer

  avcodec/av1dec : partially clean state on frame decoding errors
  Fixes : member access within null pointer of type 'TileGroupInfo' (aka 'struct TileGroupInfo')
  
  Fixes : 25725/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AV1_fuzzer-5166692706287616
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/av1dec.c

• How to prevent gray overlays, transparency issues, and similar shader defects when using gl-transition filters

  29 janvier 2021, par Soren Wray

  I compiled and installed a local build of ffmpeg with support for gl-transition adapted from the official guide for Ubuntu. The build is configured with all relevant packages and seems to be working as intended. See the code samples at the end.

  


  I know the gl-transition filter is installed due to ./ffmpeg -v 0 -filters | grep gltransition, which outputs :

  


  T.. gltransition      VV->V      OpenGL blend transitions

  


  All sources were tested with the custom command string : ./ffmpeg -i ~/PATH/TO/INPUT1.mp4 -i ~/PATH/TO/INPUT2.mp4 -filter_complex "gltransition=duration=3:offset=1:source=/PATH/TO/EFFECT.glsl" -y ~/PATH/TO/OUTPUT.mp4, which is for a 3 second transition effect (duration=3), starting at 1 second (offset=1).

  


  I've been testing the code sources for various transition effects listed in the gl-transition gallery and have encountered some unusual gray overlays at the transition points, likely having to do with alpha channel transparency. In many cases, there are also shader or animation defects, e.g. with windowslice.glsl rendering only 1 slice when there are supposed to be 10, or again with WaterDrop.glsl, which simply fades out the clip in place of the intended ripple effect. Most complex animations seem to default to this monotonous gray overlay. I provide a gif example below for the GlitchedMemories.glsl transition.

  


  Example of Glitched Memories

  


  I couldn't locate any other reports of this particular issue online. The documentation for gl-transitions is sorely lacking and the Stack Exchange network has very little information about this custom filter. I don't know how to fix the problem. It could have something to do with the codec or pixel format used, or some quirk of my build, but the technical details are beyond me.

  


  Please note my compilation and configuration steps, perhaps the error is there :

  


  sudo apt-get update -qq && sudo apt-get -y install autoconf automake build-essential cmake git-core libass-dev libfreetype6-dev libgnutls28-dev libsdl2-dev libtool libunistring-dev libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev pkg-config texinfo wget yasm zlib1g-dev

mkdir -p ~/ffmpeg_sources ~/bin

sudo apt-get install nasm libx264-dev libx265-dev libnuma-dev libvpx-dev libfdk-aac-dev libmp3lame-dev libopus-dev

cd ~/ffmpeg_sources && wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && tar xjvf ffmpeg-snapshot.tar.bz2

cd ~/ && git clone https://github.com/transitive-bullshit/ffmpeg-gl-transition.git


  


  Open ~/ffmpeg-gl-transition/vf_gltransition.c in an editor and delete line : # define GL_TRANSITION_USING_EGL // remove this line if you don't want to use EGL

  


  cd ~/ffmpeg_sources/ffmpeg && cp ~/ffmpeg-gl-transition/vf_gltransition.c libavfilter/

git apply ~/ffmpeg-gl-transition/ffmpeg.diff

PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
    --prefix="$HOME/ffmpeg_build" \
    --pkg-config-flags="--static" \
    --extra-cflags="-I$HOME/ffmpeg_build/include" \
    --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
    --extra-libs="-lpthread -lm" \
    --bindir="$HOME/bin" \
    --enable-gpl \
    --enable-opengl \
    --enable-gnutls \
    --enable-libass \
    --enable-libfdk-aac \
    --enable-libfreetype \
    --enable-libmp3lame \
    --enable-libopus \
    --enable-libvorbis \
    --enable-libvpx \
    --enable-libx264 \
    --enable-libx265 \
    --disable-shared \
    --enable-static \
    --enable-runtime-cpudetect \
    --enable-filter=gltransition \
    --extra-libs='-lGLEW -lglfw' \
    --enable-nonfree && \
PATH="$HOME/bin:$PATH" make

source ~/.profile


  


• Configured Half-ninja android FFMPEG project

  24 décembre 2013, par Mr.G

  I have configured android-halfninja project completely and i manage to build

  refered to this link

  libs/armeabi/libvideokit.so and
  libs/armeabi/ffmpeg

  libs from the given source

  But i had to make some changes to the .sh files in order to build .so files.

  But now i tried to execute following ffmpeg command in my android project it doesn't run properly

      String var[] = {"ffmpeg","-i",input};
  
  
  
  
  
  
  
  12-24 10:34:44.569: I/VideoKit(14374): Loading native library compiled at 14:43:51 Dec 18 2013
  
  12-24 10:34:44.599: I/ActivityManager(290): Process uk.co.halfninja.videokit (pid 14374) has died.
  
  12-24 10:34:44.599: W/ActivityManager(290): Force removing ActivityRecord{2bea3e28 uk.co.halfninja.videokit/.MainActivity}: app died, no saved state

  Can any one tell me what might be th issue to have this error in half-nonja project

  here is my configure_ffmpeg.sh file

      #!/bin/bash
  
  pushd `dirname $0`
  
  . settings.sh
  
  
  
  if [[ $DEBUG == 1 ]]; then
  
    echo "DEBUG = 1"
  
    DEBUG_FLAG="--disable-stripping"
  
  fi
  
  
  
  # I haven't found a reliable way to install/uninstall a patch from a Makefile,
  
  # so just always try to apply it, and ignore it if it fails. Works fine unless
  
  # the files being patched have changed, in which cause a partial application
  
  # could happen unnoticed.
  
  patch -N -p1 --reject-file=- < redact-plugins.patch
  
  patch -N -p1 --reject-file=- < arm-asm-fix.patch
  
  patch -d ffmpeg -N -p1 --reject-file=- < \
  
      ARM_generate_position_independent_code_to_access_data_symbols.patch
  
  patch -d ffmpeg -N -p1 --reject-file=- < \
  
      ARM_intmath_use_native-size_return_types_for_clipping_functions.patch
  
  patch -d ffmpeg -N -p1 --reject-file=- < \
  
      enable-fake-pkg-config.patch
  
  
  
  pushd ffmpeg
  
  
  
  ./configure \
  
  $DEBUG_FLAG \
  
  --arch=arm \
  
  --cpu=cortex-a8 \
  
  --target-os=linux \
  
  --enable-runtime-cpudetect \
  
  --prefix=$prefix \
  
  --enable-pic \
  
  --disable-shared \
  
  --enable-static \
  
  --cross-prefix=$NDK_TOOLCHAIN_BASE/bin/$NDK_ABI-linux-androideabi- \
  
  --sysroot="$NDK_SYSROOT" \
  
  --extra-cflags="-I../x264 -mfloat-abi=softfp -mfpu=neon" \
  
  --extra-ldflags="-L../x264" \
  
  \
  
  --enable-version3 \
  
  --enable-gpl \
  
  \
  
  --disable-doc \
  
  --enable-yasm \
  
  \
  
  --disable-everything \
  
  --enable-decoder=mjpeg \
  
  --enable-demuxer=mjpeg \
  
  --enable-parser=mjpeg \
  
  --enable-demuxer=image2 \
  
  --enable-muxer=mp4 \
  
  --enable-encoder=libx264 \
  
  --enable-decoder=rawvideo \
  
  --enable-protocol=file \
  
  --enable-hwaccels \
  
  --enable-filter=buffer \
  
  --enable-filter=buffersink \
  
  --disable-demuxer=v4l \
  
  --disable-demuxer=v4l2 \
  
  --disable-indev=v4l \
  
  --disable-indev=v4l2 \
  
  \
  
  --disable-indevs \
  
  --enable-indev=lavfi \
  
  --disable-outdevs \
  
  \
  
  --enable-hwaccels \
  
  \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-network \
  
  \
  
  --enable-libx264 \
  
  --enable-zlib \
  
  --enable-muxer=md5
  
  
  
  popd; popd
  
  
  
  
  
  #--enable-decoders \
  
  #--enable-encoders \
  
  #--enable-muxers \
  
  #--enable-demuxers \
  
  #--enable-parsers \
  
  #--enable-protocols \
  
  #--enable-filter=buffer \
  
  #--enable-filter=buffersink \
  
  #--enable-avresample \
  
  #--enable-faac \