Opened 4 months ago
Last modified 4 months ago
#11155 new task
Clarification on x264 "deblock" of lossless, and x265 comparison
Reported by: | MasterQuestionable | Owned by: | |
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Priority: | normal | Component: | avcodec |
Version: | unspecified | Keywords: | libx264 documentation |
Cc: | MasterQuestionable | Blocked By: | |
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Attachments (2)
Change History (5)
by , 4 months ago
Attachment: | mediainfo.diff.webp added |
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by , 4 months ago
Attachment: | cmdlog.txt added |
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͏ See also: https://forum.doom9.net/showthread.php?t=176252&page=2#post1871585
͏ -x265-params "lossless=1:keyint=15:no-deblock=1:no-sao=1"
"x265.mkv" (254,612 KB)
͏ -x265-params "lossless=1:keyint=15:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1"
"x265_no-strong-intra-smoothing.mkv" (254,614 KB)
͏ -x265-params "lossless=1:keyint=15:me=4:subme=7:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1"
"x265_X.mkv" (254,535 KB)
͏ -qp 0 -x264-params "keyint=15:no-deblock=1"
"x264.mkv" (249,922 KB)
͏ -qp 0 -x264-params "keyint=15:no-deblock=1:weightp=0"
"x264_weightp=0.mkv" (250,526 KB)
͏ -x265-params "lossless=1:keyint=15:bframes=0:ref=8:me=4:subme=7:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1"
"x265_XX.mkv" (277,259 KB)
͏ -x265-params "lossless=1:keyint=15:bframes=0:b-adapt=0:no-weightb=1:no-b-intra=1:ref=8:me=4:subme=7:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1"
"x265_XXrev.mkv" (277,276 KB)
͏ -x265-params "lossless=1:keyint=15:no-cutree=1:psy-rd=0:rdoq-level=0:bframes=0:ref=8:me=4:subme=7:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1"
"x265_XXFinal.mkv" (277,266 KB)
͏ -x265-params "qp=0:lossless=1:keyint=15:bframes=0:ref=8:me=4:subme=7:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1"
"x265_Finale.mkv" (277,259 KB)
͏ -x265-params "lossless=1:keyint=15:bframes=16:ref=16:me=4:subme=7:no-deblock=1:no-sao=1"
"x265_FinaleX.mkv" (254,211 KB)
͏ -x265-params "allow-non-conformance=1:lossless=1:keyint=15:bframes=16:ref=16:me=4:no-deblock=1:no-sao=1"
"x265_FinaleFinal.mkv" (254,335 KB)
comment:2 by , 4 months ago
͏ Points of interest:
͏ |1| x265 "strong-intra-smoothing" (also some other lossy options) miraculously affecting lossless??
͏ |2| x265 B-frame related various still differ when "bframes=0"...
͏ Concerning the speed and final output...
comment:3 by , 4 months ago
Summary: | Clarification on x264 "deblock" of lossless → Clarification on x264 "deblock" of lossless, and x265 comparison |
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͏ 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?t=176252
͏ 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)