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• libavcodec/ppc/mpegvideoencdsp.c : fix pix_norm1_altivec() and pix_sum_altivec()...

  10 octobre 2014, par Rong Yan

  libavcodec/ppc/mpegvideoencdsp.c : fix pix_norm1_altivec() and pix_sum_altivec() for POWER LE
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/ppc/mpegvideoencdsp.c

• Extract image of every frame of a video using react-native-ffmpeg

  1er octobre 2020, par EdG

  I have looked all over the internet to get a way to extract image of everyframe of a video using react-native-ffmpeg. I am making a mobile app and I want to show all per frame images on the video timeline. I want to do this natively on mobile so that I can utilise hardware power of mobile. That is the reason I am looking for react-native-ffmpeg kind of library. Am I in the right direction ? This npmjs.com/package/react-native-ffmpeg is what I am trying to use. I need to know the command to do the job.

  


• Compile FFMPEG for command line usage

  3 septembre 2014, par Lior Iluz

  I’ve been trying to compile FFMPEG so I can use it with my Android application with commands. The result should be 1 static file, "ffmpeg", that is not package dependent. No .so files.

  I managed to compile it with guardianProject and everything is working but the source was too old and lacks options I need.
  I’m using the latest Ubuntu on VirtualBox, all essentials are installed and updated (gawk, yasm, aptitude, etc...).

  There are multiple examples around the web. Here are the issues I’ve experienced with each of the options I tried. I’d appreciate help with either one of the following errors :

  1. Guardian project - I managed to compile it and get the ffmpeg file but it uses an old version of ffmpeg that doesn’t include the "-movFlags faststart" option. I tried throwing the new ffmpeg (2.3.3) in there but it just throws error. (I ran git submodule init and update)

  2. JayH5 - A more generic build file that basically should work with every ffmpeg. I updated the build script to work with the latest NDK and it seems to be working but than it fails on /home/dor/Desktop/ndk/android-ndk-r10/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-pkg-config not found, library detection may fail.
     I read about this and it seems to require a hack, which I don’t understand how to implement.

  3. Trovao - this is a very nice project and the build script even downloads the latest ffmpeg and x264 sources, and I even succeeded in compiling it to FFMPEG and X264 files but when I use it, I get this error : could not load library "libx264.so.142 which is weird, as x264 is there and the whole idea of this project is to cancel the need of .so files.

  I’d appreciate help with figuring out how to solve any of the issues. I prefer using the JayH5 build script as it seems the most straight forward out there...

  JayH5 build file :

  #!/bin/bash
  
  
  
  # set the base path to your Android NDK (or export NDK to environment)
  
  
  
  if [[ "x$NDK_BASE" == "x" ]]; then
  
      NDK_BASE=/opt/android-ndk
  
      echo "No NDK_BASE set, using $NDK_BASE"
  
  fi
  
  
  
  NDK_PLATFORM_VERSION=14
  
  NDK_ABI=arm
  
  NDK_COMPILER_VERSION=4.8
  
  NDK_SYSROOT=$NDK_BASE/platforms/android-$NDK_PLATFORM_VERSION/arch-$NDK_ABI
  
  NDK_UNAME=`uname -s | tr '[A-Z]' '[a-z]'` # Convert Linux -> linux
  
  HOST=$NDK_ABI-linux-androideabi
  
  NDK_TOOLCHAIN_BASE=$NDK_BASE/toolchains/$HOST-$NDK_COMPILER_VERSION/prebuilt/$NDK_UNAME-x86
  
  CC="$NDK_TOOLCHAIN_BASE/bin/$HOST-gcc --sysroot=$NDK_SYSROOT"
  
  LD=$NDK_TOOLCHAIN_BASE/bin/$HOST-ld
  
  
  
  BUILD_PATH=build/ffmpeg
  
  
  
  ./configure \
  
  $DEBUG_FLAG \
  
  --arch=arm \
  
  --target-os=linux \
  
  --enable-runtime-cpudetect \
  
  --enable-pic \
  
  --disable-shared \
  
  --enable-static \
  
  --cross-prefix=$NDK_TOOLCHAIN_BASE/bin/$NDK_ABI-linux-androideabi- \
  
  --sysroot="$NDK_SYSROOT" \
  
  --extra-cflags="-march=armv7-a -mfloat-abi=softfp -fPIC -DANDROID" \
  
  --extra-ldflags="" \
  
  --enable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-network \