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• configure.ac : Pass -fno-inline-small-functions when using GCC 4.7

  8 juin 2015, par Mario Sanchez Prada

  configure.ac : Pass -fno-inline-small-functions when using GCC 4.7
  For some reason, the build fails when using GCC 4.7 due to the implicit
  
   finline-functions option passed to the compiler when -O3 is enabled,
  
  which does not happen in newer versions of GCC, probably due to some of
  
  the "General Optimizer Improvements" included in 4.8 (see [1]).
  Fortunately, we don’t need to disable -finline-functions completely but
  
  just do it for "small functions", which is what this patch does.
  [1] https://gcc.gnu.org/gcc-4.8/changes.html
  Closes : https://sourceforge.net/p/flac/bugs/429/
  
  Signed-off-by : Erik de Castro Lopo <erikd@mega-nerd.com>
  

  • [DH] configure.ac

• avcodec/mpeg_er : Simplify disabling IDCT

  13 juin 2024, par Andreas Rheinhardt

  avcodec/mpeg_er : Simplify disabling IDCT
  The error resilience code does not make up block coefficients
  
  and therefore zeroes them in order to disable the IDCT.
  
  But this can be done in a simpler manner, namely by setting
  
  block_last_index to a negative value. Doing so also has
  
  the advantage that the dct_unquantize functions are never even
  
  called for those codecs that do not use ff_mpv_reconstruct_mb()
  
  for ordinary decoding (namely RV-30/40 and the VC-1 family).
  This approach would not work for intra macroblocks (there is always
  
  at least one coefficient for them and therefore there is no check
  
  for block_last_index for them), but this does not happen at all.
  
  Add an assert for this.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg_er.c

• Disable default subtitle track with ffmpeg

  23 février 2023, par anonymous

  I'm creating an MKV container with 4 different files :

  


  

  • video.mp4

  


  • audio_en.mp4

  


  • audio_es.mp4

  


  • subtitles.ass

  


  


  For that I'm using the following ffmpeg script :

  


  ffmpeg -i video.mp4 -i audio_es.mp4 -i audio_en.mp4 -i subtitles.ass \
-map 0:v -map 1:a -map 2:a -map 3:s \
-metadata:s:a:0 language=spa \
-metadata:s:a:1 language=eng \
-metadata:s:s:0 language=spa -disposition:s:0 -default \
-default -c:v copy -c:a copy -c:a copy -c:s copy result.mkv


  


  The result.mkv looks awesome, everything works as expected except for one thing : subtitles are still set as the default track, so players like VLC shows them automatically. I've already tried plenty of different ways to avoid that to happen with the disposition flag but I cannot make it work.

  


  How should I modify the script so that the MKV does not have the subtitles track marked as default ?

  


  Thanks in advance !