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• FFMPEG source compilation failed with Android NDK Clang compiler (r16b) with error "the clang compiler does not support '-mcpu=arm'"

  10 juillet 2018, par Prasaathviki

  while compiling FFMPEG source with Android NDK Clang compiler (r16b), I’m getting compiler error.

  for the below config :

  ./configure \
  
  --prefix=/home/prasaathviki/Desktop/ffmpeg/bin/android/26/arm64_26 \
  
  --cross- 
  
  prefix=/home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android- \
  
  --sysroot="/home/prasaathviki/Desktop/depends/android/ndk/mytoolchains/r16b/arm64_26/sysroot" \
  
  --disable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-symver \
  
  --enable-shared \
  
  --enable-protocol=concat \
  
  --enable-protocol=file \
  
  --enable-muxer=mp4 \
  
  --enable-demuxer=mpegts \
  
  --target-os=android \
  
  --enable-decoder=h264 \
  
  --enable-cross-compile \
  
  --arch=arm \
  
  --cpu=arm \
  
  --toolchain=clang-usan \
  
  --extra-cflags="-fPIE -fPIC -ffast-math -funroll-loops -mfloat-abi=softfp -mfpu=vfpv3-d16" \
  
  --extra-ldflags="-pie" \
  
  --cc=/home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-clang \
  
  --cxx=/home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-clang++ \
  
  --ld=/home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-ld \
  
  --as=/home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-clang \
  
  --ar=/home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-ar \
  
  --strip=/home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-strip

  In ffbuild/Config.log i’m getting this below error..

  /home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-clang --sysroot=/home/prasaathviki/Desktop/depends/android/ndk/mytoolchains/r16b/arm64_26/sysroot -fsanitize=undefined -fPIE -fPIC -ffast-math -funroll-loops -mfloat-abi=softfp -mfpu=vfpv3-d16 -mcpu=arm -c -o /tmp/ffconf.Hn6wyaNC/test.o /tmp/ffconf.Hn6wyaNC/test.c
  
  clang50: error: the clang compiler does not support '-mcpu=arm'
  
  C compiler test failed.

  Also i have tried without —cpu flag, but still it reported an error as below

  /home/prasaathviki/Desktop/ndk/mytoolchains/r16b/arm64_26/bin/aarch64-linux-android-clang --sysroot=/home/prasaathviki/Desktop/depends/android/ndk/mytoolchains/r16b/arm64_26/sysroot -fsanitize=undefined -fPIE -fPIC -ffast-math -funroll-loops -mfloat-abi=softfp -mfpu=vfpv3-d16 -mcpu= -c -o /tmp/ffconf.gQNwoHgC/test.o /tmp/ffconf.gQNwoHgC/test.c
  
  clang50: warning: joined argument expects additional value: '-mcpu=' [-Wunused-command-line-argument]
  
  clang50: error: the clang compiler does not support '-mcpu='
  
  C compiler test failed.

  Please help me to resolve this issue. Thanks.

• Revision 81ad047ee5 : VP8 for ARMv8 by using NEON intrinsics 06 Add idct_dequant_full_2x_neon.c - idc

  17 décembre 2013, par James Yu

  Changed Paths :
   Delete /vp8/common/arm/neon/idct_dequant_full_2x_neon.asm

  
   Add /vp8/common/arm/neon/idct_dequant_full_2x_neon.c

  
   Modify /vp8/vp8_common.mk

  
  
  VP8 for ARMv8 by using NEON intrinsics 06

  Add idct_dequant_full_2x_neon.c
   idct_dequant_full_2x_neon

  ==== Summary of apply VP8 decode patch series ====
  Benchmark on Samsung Chromebook, Cortex-A15, 1.7GHz, Dual core
  Toolchain : linaro-1.13.1-4.8-2014.01
  Compile argument : CROSS=arm-linux-gnueabihf- ../libvpx/configure
  —target=armv7-linux-gcc —prefix=$HOME/out
  —enable-shared —cpu=cortex-a7
  Test argument : vpxdec —summary —noblit ./tears_of_steel_1080p.webm

  NEON assembly 46.68 (fps)
  Apply patch 06 46.65, -0.03
  Apply patch 07 46.86, +0.21
  Apply patch 08 46.58, -0.28
  Apply patch 09 46.57, -0.01
  Apply patch 10 46.51, -0.06
  Apply patch 11 46.13, -0.38
  Apply patch 12 45.42, -0.71
  Apply patch 13 46.06, +0.64
  Apply patch 14 45.19, -0.87
  Apply patch 15 45.93, +0.74
  Apply patch 16 45.48, -0.45
  Apply patch 17 45.84, +0.36
  Apply patch 18 45.91, +0.07 <= With all NEON intrinsics patches
  Total -0.77 fps, 1.65% performance regression

  Change-Id : I77bfc9eaccfb97b8d401e949ceff8795e26ca6b7
  Signed-off-by : James Yu <james.yu@linaro.org>

• HTML5 audio conversion using NodeJS on Heroku

  14 mars 2015, par nvd_ai

  I have a HTML5 app that allows users to upload and play their audio files. The server is Node running on Heroku.

  To allow cross-browser audio play, what I understand is that I have to at least maintain two formats of each audio file, let’s say .mp3 and .ogg. So, I need to transcode the files automatically on the server side.

  The problem is that Heroku does not run ffmpeg. I found this project that creates a custom buildpack for heroku that supports ffmpeg but it seems to be for Rails apps : https://github.com/dzello/ffmpeg-heroku.

  I was thinking to run an external server for transcoding, which my nodejs app sends the file to, it does the transcoding, and reuploads the new file on my nodejs server. But I don’t know how to set up such a server, and whether there is already a ready solution which does this kind of work ?

  So, here are my questions :

  1- Is there a solution to run ffmpeg on heroku+nodejs?
  
  
  
  2- How can I set up a transcoding server that communicates with my nodejs+heroku server?

  Thanks !