[FFmpeg-trac] #11155(avcodec:new): Clarification on x264 "deblock" of lossless

[FFmpeg]

#11155: Clarification on x264 "deblock" of lossless
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             Reporter:               |                    Owner:  (none)
  MasterQuestionable                 |
                 Type:  task         |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  unspecified  |               Resolution:
             Keywords:  libx264      |               Blocked By:
  documentation                      |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by MasterQuestionable):

 ͏
 https://www.google.com/search?hl=en&gl=ca&num=10&q=x264+lossless|%22qp+0%22
 +%22no-deblock%22
 ͏    https://forum.doom9.net/showthread.php?p=1871282
 ͏    https://stackoverflow.com/questions/69755864#77176160

 ͏    Why should "deblock" even matter for lossless..?
 ͏    Not even to mention various H.265 bizarreries...

 ͏    Experimented with below sample:
 ͏    `ffmpeg -y -v trace -hide_banner -nostdin -nostats -ignore_editlist 1
 -i "trembling_text_input.mp4" -pix_fmt yuv444p -sws_flags
 spline+accurate_rnd+full_chroma_int -c:v libx264 -preset placebo -qp 0
 -x264-params "keyint=infinite:no-deblock=1" -flags +bitexact -fflags
 +bitexact -map_metadata -1 -map_chapters -1 -cues_to_front 1 -write_crc32
 0 -default_mode 0 "yuv444p.mkv"`

 ͏    Mostly no output difference.
 ͏    The only difference would be the written in-file encoding settings:
 "deblock=0:0:0"...
 ͏    Which is just sort of metadata, much unused.
 ͏    See also:
 https://github.com/richtr/NoSleep.js/issues/157#issuecomment-1529156077

 ͏    Maybe then x264 had bugs with it? Considering x265's...
 \\
 \\
 ͏    "trembling_text_input.mp4":
 ͏    https://trac.ffmpeg.org/raw-
 attachment/ticket/11149/trembling_text_input.mp4
 ͏    (~ 525.49 KiB)
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Ticket URL: <https://trac.ffmpeg.org/ticket/11155#comment:1>
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