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• lavc/vvc : Ensure subpictures don't overlap

  22 février, par Frank Plowman

  lavc/vvc : Ensure subpictures don't overlap
  This is essentially a re-implementation of
  
  https://patchwork.ffmpeg.org/project/ffmpeg/patch/20241005223955.54158-1-post@frankplowman.com/
  That patch was not applied last time.  Instead we opted to identify
  
  issues which could be caused by invalid subpicture layouts and remedy
  
  those issues where they manifest, either through error detection or code
  
  hardening.  This was primarily implemented in the set
  
  https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=13381.
  This has worked to some degree, however issues with subpicture layouts
  
  continue to crop up from the fuzzer and I've fixed a number of bugs
  
  related to subpicture layouts since then.  I think it's best to return
  
  to the initial plan and simply check if the subpicture layout is valid
  
  initially.
  This implementation is also lighter than the first time — by doing a
  
  bit more logic in pps_subpic_less_than_one_tile_slice, we are able to
  
  store a tile_in_subpic map rather than a ctu_in_subpic map.  This
  
  reduces the size of the map to the point it becomes possible to allocate
  
  it on the stack.  Similar to 8bd66a8c9587af61c7b46558be3c4ee317c1af5a,
  
  the layout is also validated in the slice map construction code, rather
  
  than in the CBS, which avoids duplicating some logic.
  Signed-off-by : Frank Plowman <post@frankplowman.com>
  

  • [DH] libavcodec/vvc/ps.c

• avcodec/ffv1enc : Factor set_micro_version() out of ff_ffv1_write_extradata()

  11 mars, par Michael Niedermayer

  avcodec/ffv1enc : Factor set_micro_version() out of ff_ffv1_write_extradata()
  and call it from ff_ffv1_encode_init()
  setting micro version from code writing the extradata is messy, this should
  
  be cleaner
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/ffv1enc.c

• fftools/ffmpeg_filter : simplify choose_pix_fmts

  25 octobre 2023, par Niklas Haas

  fftools/ffmpeg_filter : simplify choose_pix_fmts
  The only meaningful difference between choose_pix_fmts and the default
  
  code was the inclusion of an extra branch for `keep_pix_fmt` being true.
  However, in this case, we either :
  
  1. Force the specific `ofp->format` that we inherited from
  
     ofilter_bind_ost, or if no format was set :
  
  2. Print an empty format list
  Both of these goals can be accomplished by simply moving the decision
  
  logic to ofilter_bind_ost, to avoid setting any format list when
  
  keep_pix_fmt is enabled. This is arguably cleaner as it moves format
  
  selection logic to a single function. In the case of branch 1, nothing
  
  else needs to be done as we already force the format provided in
  
  ofp->format, if any is set. Add an assertion to verify this assumption
  
  just in case.
  (Side note : The "choose_*" family of functions are arguably misnomers,
  
  as they should really be called "print_*" - their current behavior is to
  
  print the relevant format lists to the `vf/af_format` filter arguments)
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  
  Signed-off-by : Niklas Haas <git@haasn.dev>
  

  • [DH] fftools/ffmpeg_filter.c