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• aaccoder : add a new perceptual noise substitution implementation

  2 juillet 2015, par Rostislav Pehlivanov

  aaccoder : add a new perceptual noise substitution implementation
  This commit finalizes the PNS implementation previously added to the encoder
  
  by moving it to a seperate function search_for_pns() and thus making it
  
  coder-generic. This new implementation makes use of the spread field of
  
  the psy bands and the lambda quality feedback paremeter. The spread of the
  
  spectrum in a band prevents PNS from being used excessively and thus preserve
  
  more phase information in high frequencies.  The lambda parameter allows
  
  the number of PNS-marked bands to vary based on the lambda parameter and the
  
  amount of bits available, making better choices on which bands are to be marked
  
  as noise. Comparisons with the previous PNS implementation can be found
  
  here : https://trac.ffmpeg.org/attachment/wiki/Encode/AAC/
  This is V2 of the patch, the changes from the previous version being that this
  
  version uses the new band->spread metric from aacpsy and normalizes the
  
  energy using the group size. These changes were suggested by Claudio Freire
  
  on the mailing list. Another change is the use of lambda to alter the
  
  frequency threshold. This change makes the actual threshold frequencies
  
  vary between +-2Khz of what’s specified, depending on frame encoding performance.
  Reviewed-by : Claudio Freire <klaussfreire@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/aaccoder.c
  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/aacenc.h

• Compiling ffmpeg for Android using Linux

  1er juillet 2015, par VEP10

  I’d like to test the ijkplayer for android project according to this :
  https://github.com/bbcallen/ijkplayer/blob/master/README.md
  When I am compiling the ffmpeg (./compile-ffmpeg.sh) at the "configurate ffmpeg" phase I get the following message : arm-linux-androideabi-gcc is unable to create an executable file. C compiler test failed.
  This part of the compile-ffmpeg.sh file :

  echo "\n--------------------"
  
  echo "[*] configurate ffmpeg"
  
  echo "--------------------"
  
  cd $FF_SOURCE
  
  if [ -f "./config.h" ]; then
  
      echo 'reuse configure'
  
  else
  
      ./configure $FF_CFG_FLAGS \
  
          --extra-cflags="$FF_CFLAGS $FF_EXTRA_CFLAGS" \
  
          --extra-ldflags="$FF_DEP_LIBS $FF_EXTRA_LDFLAGS"
  
      make clean
  
  fi 

  At the end of the config.log file I found the problem :

  zoompan_filter_deps='swscale'
  
  WARNING: arm-linux-androideabi-pkg-config not found, library detection may fail.
  
  mktemp -u XXXXXX
  
  tHt73A
  
  check_ld cc
  
  check_cc
  
  BEGIN /tmp/ffconf.mvjZdW0f.c
  
      1   int main(void){ return 0; }
  
  END /tmp/ffconf.mvjZdW0f.c
  
  arm-linux-androideabi-gcc -O3 -Wall -pipe -std=c99 -ffast-math -fstrict aliasing -Werror=strict-aliasing -Wno-psabi -Wa,--noexecstack -DANDROID -DNDEBUG -march=armv7-a -mcpu=cortex-a8 -mfpu=vfpv3-d16 -mfloat-abi=softfp -mthumb -mcpu=cortex-a8 -c -o /tmp/ffconf.ZKAEl7Bh.o /tmp/ffconf.mvjZdW0f.c
  
  as: unrecognized option '-mcpu=cortex-a8'
  
  C compiler test failed.

  I am sure that the assembler knows the cortex-a8 cpu option. The problem is anywhere else.

  Environment :

  Ubuntu 14.04

  NDK : r10e

  arm-linux-androideabi-4.8

  gcc-4.6

  Please help !

• WordPress Analytics plugin WP-Piwik reaches version 1.0.0 (and 50,000 active users)

  29 mai 2015, par André Bräkling — Plugins

  After six years of development, we are proud to announce the 1.0.0 release of our WP-Piwik WordPress plugin !

  Started as a simple plugin to show a selection of statistics within the WordPress dashboard, WP-Piwik has become a full Piwik integration plugin. The plugin automatically adds the Piwik tracking code to your WordPress sites. The plugin displays your analytics reports directly within the WordPress admin panel. WordPress networks (“multisite”), CDN URLs and the Piwik proxy script are also supported.

  According to WordPress.org the plugin is being used by more than 50,000 WordPress sites !

  

  This article explains how to install WP-Piwik and how to configure it to work with your Piwik instance.
  

  Install WP-Piwik

  You can get WP-Piwik using WordPress’ plugin management. Login to your WordPress admin dashboard and go to « Plugins » → « Add New ». Enter « WP-Piwik » into the search field at the top right, press enter and next to WP-Piwik choose « Install Now ».

  

  If you want to use WP-Piwik in your simple WordPress blog you can just click « Activate Plugin » and WP-Piwik will ask you to configure your Piwik connection.

  Running a WordPress network/multisite you can choose to « Network Activate » the plugin after the installation process. In this case, WP-Piwik will be a fully automated feature of your WordPress network automatically tracking your sites in the same Piwik instance in separate Websites.

  Alternatively you can download WP-Piwik manually from the WordPress website and upload all files to your `wp-content/plugins` directory.

  Configure your Piwik connection

  WP-Piwik lets you choose between three connection modes :

  • Self-hosted (HTTP API) : This is the default option for a self-hosted Piwik and should work for most configurations. You just have to know your Piwik URL, which is the URL you enter to access Piwik, and your auth token (see below). WP-Piwik will connect to Piwik using http(s)-requests.
  • Self-hosted (PHP API) : Choose this, if your self-hosted Piwik and WordPress are running on the same machine and you know the full server path to your Piwik instance. Beside the full server path, you also need to know your auth token (see below).
  • Cloud-hosted (Piwik Pro) : If you are using a cloud-hosted Piwik by Piwik Pro, you just need to know your user name and your auth token (see below).

  Setting up WP-Piwik

  To configure WP-Piwik you will need to specify your Authentication token.

  • If the site you want to track in Piwik is already configured in your Piwik, you only need to specify a token_auth for a user with `view` permission.
  • If you want WP-Piwik to create the website in Piwik (or if you use WP-Piwik in network mode which requires to be able to configure your sites), you should specify a token_auth which has Super User access (after the setting up phase is completed you can set the authentication token back to the token of a `view` user).

  To find your token_auth in Piwik, click on your user name in the right right corner of your Piwik dashboard, then click the « API » in the left menu. The API page displays your auth token in a colored box, just behind the “&token_auth=” string. The screenshot below shows the token_auth anonymous, but your real one will be an alpha numerous random string like a1ec31524a8eabc7a546d71d68b28d17.

  

  That’s it. After you entered your connection data and submitted the form, WP-Piwik will welcome you with some information :

  

  You can now start to configure WP-Piwik and enable the tracking code. Learn about any setting by clicking on the small question mark sign. If you have any problem configuring or using WP-Piwik feel free to use the WordPress support forum related to WP-Piwik.

  Translating WP-Piwik

  We invite you to join our translation community at Transifex and help to translate WP-Piwik in more languages !

  Happy WordPress Analytics !