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• Revision 4e66293fcb : Use source frame difference to make partition decision Calculate the difference

  2 avril 2014, par Yunqing Wang

  Changed Paths :
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodeframe.h

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_speed_features.c

  
   Modify /vp9/encoder/vp9_speed_features.h

  
   Modify /vp9/encoder/vp9_variance.c

  
  
  Use source frame difference to make partition decision

  Calculate the difference variance between last source frame and
  current source frame. The variance is calculated at 16x16 block
  level. The variances are compared to several thresholds to decide
  final partition sizes.

  An adaptive strategy is implemented to decide using
  SOURCE_VAR_BASED_PARTITION or FIXED_PARTITION based on motions
  in the video. The switching test is done once every
  search_type_check_frequency frames.

  The selection of source_var_thresh needs to be investigated
  further later.

  RTC set Borg test showed 0.424% overall psnr gain, and 0.357%
  ssim gain. For clips with large enough static area, the
  encoding speedup is around 2% to 15%.

  Change-Id : Id7d268f1d8cbca7fb8026aa4a53b3c77459dc156

• Why my ffmpeg libs are so large ? [on hold]

  9 avril 2014, par user3504221

  I compiled ffmpeg libs on my Ubuntu 64-bits using the following script :

     mkdir ~/ffmpeg_sources

  #x264

  cd ~/ffmpeg_sources
  
     wget http://download.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
  
     tar xjvf last_x264.tar.bz2
  
     cd x264-snapshot*
  
     ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static --disable-asm
  
     make
  
     make install
  
     make distclean

  #FFmpeg

  cd ~/ffmpeg_sources
  
     wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
  
     tar xjvf ffmpeg-snapshot.tar.bz2
  
     cd ffmpeg
  
     PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig"
  
     export PKG_CONFIG_PATH
  
     ./configure --prefix="$HOME/ffmpeg_build" --extra-cflags="-I$HOME/ffmpeg_build/include" \
  
     --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" --extra-libs="-ldl" --   enable-gpl \
  
    --enable-libx264 --enable-x11grab --disable-yasm                                                                                                                               
  
     make
  
     make install
  
     make distclean
  
     hash -r

  But the final libs are really large (For example, libavcodec.a > 140 Mb). Anybody know why my libs are so large ?

  EDIT

  My Solutions :

  • add the option "—disable-debug" to the ./configure. The size of my libavcodec fell from 150Mb to 12Mb !
  • Remove all unnecessary codecs : Add the options -disable-encoders, —disable-decoders and then add only codecs you want with —enable-encoder=NAME and —enable-decoder=NAME. Print the list using ./configure —list-encoders —list-decoders. see ./configure —help for more information. (My final libavcodec has a size of 4Mo)

• Tokbox archived video is letterbox (black border around video)

  28 août 2017, par Bijan Markes

  I have archiving setup to save my tokbox publisher streams straight to an AWS S3 Bucket ; But the final saved archive.mp4 is appearing letter-boxed / has black borders around the stream video rather than stretching the video to fit the whole frame. Is there any way to change this ? It is completely on the tokbox end and I also have the fit-mode for the publisher set to "contain" although changing it to cover doesn’t change anything. Thanks.