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• AVCONV / FFMPEG hardware acceleration for video conversion

  21 mars 2016, par Alex Bern

  I have an Ubuntu PC with no video card.

  I use avconv for video conversion :

  avconv -i video.wmv -c:v libx264 -c:a libmp3lame -b:v 1800K video.mp4

  My CPU (Intel Core i7-4770K) processes 1.5-2Gb video in around 7-10 minutes.

  In the avconv github sources I saw the options

  Hardware accelerators:
  
    --enable-d3d11va         enable D3D11VA code
  
    --enable-dxva2           enable DXVA2 code
  
    --enable-vaapi           enable VAAPI code
  
    --enable-vda             enable VDA code
  
    --enable-vdpau           enable VDPAU code

  I am thinking of compiling avconv with --enable-vdpau and putting a video card into the PC.

  Does this allow avconv to use the video card for video conversion ?

  How can this increase the speed of video conversion (I mean my command) ?

  Can you help me to do this test, if you have avconv in your PC with a video card ?

  Here is an example of WMV.

• Can't link libfdk-aac for ffmpeg on Android

  19 novembre 2015, par Steve M

  I’m trying a custom build of ffmpeg with libfdk-aac for Android. I can get ffmpeg to build without libfdk-aac and it runs, and I can build libfdk-aac.so, but when I build ffmpeg with libfdk-aac I am getting CANNOT LINK EXECUTABLE DEPENDENCIES: library "libfdk-aac.so" not found when I try to run ffmpeg. libfdk-aac.so is in the same directory as the ffmpeg executable on the Android device, and I have tried the -rpath-link linker option. Here is my complete configure for ffmpeg :

  NDK=/Applications/sdk/android-ndk-r10e
  
  SYSROOT=$NDK/platforms/android-9/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --disable-shared \
  
      --enable-static \
  
      --disable-programs \
  
      --disable-doc \
  
      --disable-everything \
  
      --enable-filter=aresample \
  
      --enable-decoder=aac \
  
      --enable-decoder=aac_latm \
  
      --enable-decoder=aac_fixed \
  
      --enable-decoder=ac3 \
  
      --enable-decoder=ac3_fixed \
  
      --enable-decoder=als \
  
      --enable-decoder=alac \
  
      --enable-decoder=mp1 \
  
      --enable-decoder=mp1float \
  
      --enable-decoder=mp2 \
  
      --enable-decoder=mp2float \
  
      --enable-decoder=mp3 \
  
      --enable-decoder=mp3float \
  
      --enable-decoder=mp3adufloat \
  
      --enable-decoder=mp3adu \
  
      --enable-decoder=mp3on4 \
  
      --enable-decoder=mp3on4float \
  
      --enable-decoder=als \
  
      --enable-decoder=vorbis \
  
      --enable-decoder=flac \
  
      --enable-decoder=wavpack \
  
      --enable-decoder=wmalossless \
  
      --enable-decoder=wmapro \
  
      --enable-decoder=wmav1 \
  
      --enable-decoder=wmav2 \
  
      --enable-decoder=wmavoice \
  
      --enable-decoder=pcm* \
  
      --enable-bsf=mp3_header_decompress \
  
      --enable-bsf=aac_adtstoasc \
  
      --enable-bsf=chomp \
  
      --enable-bsf=remove_extradata \
  
      --disable-swscale \
  
      --disable-network \
  
      --enable-swresample \
  
      --enable-parser=aac \
  
      --enable-parser=aac_latm \
  
      --enable-parser=ac3 \
  
      --enable-parser=flac \
  
      --enable-parser=ac3 \
  
      --enable-parser=vorbis \
  
      --enable-parser=mpegaudio \
  
      --enable-demuxer=aac \
  
      --enable-demuxer=au \
  
      --enable-demuxer=asf \
  
      --enable-demuxer=mov \
  
      --enable-demuxer=ac3 \
  
      --enable-demuxer=eac3 \
  
      --enable-demuxer=aiff \
  
      --enable-demuxer=flac \
  
      --enable-demuxer=latm \
  
      --enable-demuxer=mp3 \
  
      --enable-demuxer=ogg \
  
      --enable-demuxer=eac3 \
  
      --enable-demuxer=xwma \
  
      --enable-demuxer=pcm* \
  
      --enable-demuxer=wav \
  
      --enable-demuxer=matroska \
  
      --enable-demuxer=rm \
  
      --enable-protocol=file \
  
      --enable-muxer=pcm* \
  
      --enable-muxer=wav \
  
      --enable-muxer=ipod \
  
      --enable-encoder=pcm* \
  
      --enable-encoder=aac \
  
      --enable-libfdk-aac \
  
      --enable-ffmpeg \
  
      --enable-libfdk-aac \
  
      --enable-encoder=libfdk_aac \
  
      --disable-avdevice \
  
      --disable-swscale-alpha \
  
      --disable-symver \
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
      --target-os=linux \
  
      --arch=arm \
  
      --cpu=cortex-a8 \
  
      --enable-cross-compile \
  
      --sysroot=$SYSROOT \
  
      --extra-cflags="-Os -fpic -I$INCLUDE_DIR $ADDI_CFLAGS" \
  
      --extra-ldflags="-fPIE -pie -L$LIB_DIR -Wl,-rpath-link,'$ORIGIN' $ADDI_LDFLAGS" \
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  INCLUDE_DIR=/Applications/sdk/android-ndk-r10e/sources/ffmpeg-2.8.1/include
  
  LIB_DIR=/Applications/sdk/android-ndk-r10e/sources/ffmpeg-2.8.1/lib
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU 
  
  ADDI_CFLAGS="-marm"
  
  build_one

• Building x264 on a Mac for android “No working C compiler found”

  20 novembre 2015, par LostPuppy

  I am trying to build x264 and eventually use it to build ffmpeg the following is my script :

  #!/bin/bash
  
  
  
  NDK="/Users/account/Documents/FFmpeg/android-ndk-r10e"
  
  TOOL_DIR_ARM="/Users/account/Documents/FFmpeg/android-ndk-r10e/sources/ffmpeg-2.8.2/my-android-toolchain"
  
  SYSROOT=$NDK/platforms/platforms/android-21/arch-arm
  
  echo "removing tool chain directory if it exists"
  
  rm -r $TOOL_DIR_ARM
  
  
  
  $NDK/build/tools/make-standalone-toolchain.sh \
  
      --platform=android-21 \
  
      --arch=arm \
  
      --install-dir=$TOOL_DIR_ARM \
  
      --toolchain=arm-linux-androideabi-clang3.6\
  
      --llvm-version=3.6 \
  
      --system=darwin-x86_64
  
  
  
  if [ -d $SYSROOT ]; then
  
      echo "$SYSROOT is a valid directory"
  
  fi
  
  
  
  function build_x264
  
  {
  
  cd x264
  
  
  
  # another build for phone
  
  ./configure \
  
  --cross-prefix=arm-linux-androideabi- \
  
  --sysroot=$SYSROOT \
  
  --host=arm-linux \
  
  --enable-static \
  
  --enable-pic \
  
  --disable-cli 
  
  
  
  make -j4
  
  make install
  
  
  
  cd ../
  
  }
  
  
  
  
  
  function build_one
  
  {
  
  cd 
  
  
  
  # another build for phone
  
  ./configure \
  
  --sysroot=$SYSROOT \
  
  --target-os=linux \
  
  --arch=arm \
  
  --cross-prefix=$TOOL_DIR_ARM/bin/arm-linux-androideabi- \
  
  --cc=$TOOL_DIR_ARM/bin/clang \
  
  --enable-cross-compile \
  
  --enable-encoder=mpeg4 \
  
  --enable-pthreads \
  
  --enable-gpl \
  
  --enable-libx264 \
  
  --enable-pic \
  
  --extra-cflags='-I/usr/local/include' \
  
  --extra-ldflags='-L/usr/local/lib'
  
  
  
  make clean
  
  make -j4
  
  make install
  
  
  
  }
  
  echo "Building x_264 library"
  
  build_x264
  
  echo "Building FFmpeg"
  
  build_one

  I get an error saying

  No working C compiler found.
  
  Makefile:3: config.mak: No such file or directory

  The following is the output from the config.log file

  checking for -mdynamic-no-pic... yes
  
  checking for -arch x86_64... yes
  
  x264 configure script
  
  
  
  checking whether gcc works... yes
  
  checking whether gcc supports for( int i = 0; i < 9; i++ ); with -std=gnu99... yes
  
  checking for -mpreferred-stack-boundary=5... no
  
  Failed commandline was:
  
  --------------------------------------------------
  
  gcc conftest.c -m64 -Qunused-arguments -Wall -I. -I$(SRCPATH) -mdynamic-no-pic -arch x86_64 -std=gnu99  -mpreferred-stack-boundary=5  -m64  -lm -arch x86_64$
  
  clang: error: unknown argument: '-mpreferred-stack-boundary=5'
  
  --------------------------------------------------
  
  Failed program was:
  
  --------------------------------------------------
  
  int main (void) {  return 0; }
  
  --------------------------------------------------
  
  checking whether yasm supports vpmovzxwd ymm0, xmm0... yes

  Solutions that I tried :

  I made sure I have a working GCC

  I have the update to date version of clang

  I have the update to date version of LLVM