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• fftools/ffmpeg : disable and deprecate -qphist

  28 mars 2023, par Anton Khirnov

  fftools/ffmpeg : disable and deprecate -qphist
  This option adds a long string of numbers to the progress line, where
  
  i-th number contains the base-2 logarithm of the number of times a frame
  
  with this QP value was seen by print_report().
  There are multiple problems with this feature :
  
  * despite this existing since 2005, web search shows no indication
  
    that it was ever useful for any meaningful purpose ;
  
  * the format of what is printed is entirely undocumented, one has to
  
    find it out from the source code ;
  
  * QP values above 31 are silently ignored ;
  
  * it only works with one video stream ;
  
  * as it relies on global state, it is in conflict with ongoing
  
    architectural changes.
  It then seems that the nontrivial cost of maintaining this option is not
  
  worth its negligible (or possibly negative - since it pollutes the
  
  already large option space) value.
  
  Users who really need similar functionality can also implement it
  
  themselves using -vstats.
  

  • [DH] doc/ffmpeg.texi
  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_opt.c

• doc/developer : drop an outdated item

  24 août 2023, par Anton Khirnov

  doc/developer : drop an outdated item
  It dates back to pre-2005 days, when people generally tended to commit
  
  their work directly without going through the mailing list. Few
  
  developers do it today, and never outside of their standalone modules.
  
  This item is thus confusing and misleading and is better removed.
  

  • [DH] doc/developer.texi

• lavd : deprecate the bktr device

  28 janvier 2024, par Anton Khirnov

  lavd : deprecate the bktr device
  It implements BSD-specific support for very old analog capture cards,
  
  which are highly unlikely to be useful today. After being added in 2005,
  
  there were never any commits to it beyond compilation fixes and generic
  
  maintenance. There have also been zero trac tickets for this device, and
  
  the only related web search result I found concludes that it does not
  
  work.
  The code also does some unacceptable things, like messing with signal
  
  handlers and storing its state in global variables.
  

  • [DH] doc/indevs.texi
  • [DH] libavdevice/bktr.c
  • [DH] libavdevice/version_major.h