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• avcodec/hevc/Makefile : Move rules for lavc/* files to lavc/Makefile

  5 juin 2024, par Andreas Rheinhardt

  avcodec/hevc/Makefile : Move rules for lavc/* files to lavc/Makefile
  If any of these files (say A) would be changed in such a way
  
  that A acquires a new dependency on another file B, building B
  
  would need to be added to all the rules that lead to A being built.
  
  Yet currently the rules for several files are spread over
  
  the lavc Makefile and the Makefile of the lavc/hevc subdir, making
  
  it more likely to be forgotten. So move the rules for these files
  
  to the lavc/Makefile.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/hevc/Makefile

• How to mimic Audacity's "truncate silence" with ffmpeg "silenceremove" filter

  16 juin 2024, par Cara Duf

  I want to remove completely silence parts from wav files with ffmpeg.

  


  Input wav can be like :


  


  I am using the following ffmpeg command to remove silence part ffmpeg -i input.wav -af silenceremove=stop_periods=-1:stop_duration=0.2:stop_threshold=-45dB output.wav because I understand from the doc that it will remove all silence parts longer than 0.2 s (silence being below -45dB).

  


  But I get that where silence part has only been reduced to around 0.1 wheras I want it to be 0 (no remaining silence).

  


  In Audacity I will use "truncate audio" filter and choose the above parameters to detect silence and in the action part I will choose to truncate to 0 : .

  


  This will yield to what I want (ie an audio with no silence part remaining) :


  


  Searching on the internet only lead me to what I already do.

  


  So how can I reproduce the output I get from Audacity "Truncate Silence" filter with ffmpeg and remove all silence parts from audio ?

  


  Edit : The output from silencedetect filter is correct : ffmpeg -i input.wav -af silencedetect=0.2:n=-45dB -f null - detects exactly what audacity detects.

  


  Thanks in advance for your help

  


• avcodec/libx265 : Don't copy A53 closed captions by default

  11 juin 2024, par Andreas Rheinhardt

  avcodec/libx265 : Don't copy A53 closed captions by default
  The SEI handling of libx265 is buggy and can easily lead
  
  to memory corruption : It reuses certain buffers, but when
  
  reusing them it presumes that it is enough for these buffers
  
  to exist and does not check whether they are actually large
  
  enough to hold what is intended to be stored in them.*
  Our users are exposed to this because forwarding A53 CC data
  
  is enabled by default. Change this to make it disabled
  
  by default.
  "Fixes" tickets #10411, #11052 and (presumably) #10906.
  * : See https://trac.ffmpeg.org/ticket/9666#comment:1
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/libx265.c