So... x265 can't match x264 for lossless encoding?

[gdgsdg123]

No matter how hard I try...



"test_x265.mkv": 254,612 KB

ffmpeg -i "%X%" -c:v libx265 -preset placebo -x265-params "lossless=1:keyint=15:no-deblock=1:no-sao=1" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265.mkv"

"test_x265_no-strong-intra-smoothing.mkv": 254,614 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -x265-params "lossless=1:keyint=15:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_no-strong-intra-smoothing.mkv"

"test_x265_X.mkv": 254,535 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -x265-params "lossless=1:keyint=15:me=4:subme=7:no-deblock=1:no-sao=1:no-strong-intra-smoothing=1" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_X.mkv"

"test_x264.mkv": 249,922 KB

ffmpeg -hide_banner -i "%X%" -c:v libx264 -preset placebo -qp 0 -x264-params "keyint=15:no-deblock=1" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x264.mkv"

"test_x264_weightp=0.mkv": 250,526 KB

ffmpeg -hide_banner -i "%X%" -c:v libx264 -preset placebo -qp 0 -x264-params "keyint=15:no-deblock=1:weightp=0" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x264_weightp=0.mkv"

"test_x265_XX.mkv": 277,259 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -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" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_XX.mkv"

"test_x265_XXrev.mkv": 277,276 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -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" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_XXrev.mkv"

"test_x265_XXFinal.mkv": 277,266 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -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" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_XXFinal.mkv"

"test_x265_Finale.mkv": 277,259 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -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" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_Finale.mkv"

"test_x265_FinaleX.mkv": 254,211 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -x265-params "lossless=1:keyint=15:bframes=16:ref=16:me=4:subme=7:no-deblock=1:no-sao=1" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_FinaleX.mkv"

"test_x265_FinaleFinal.mkv": 254,335 KB

ffmpeg -hide_banner -i "%X%" -c:v libx265 -preset placebo -x265-params "allow-non-conformance=1:lossless=1:keyint=15:bframes=16:ref=16:me=4:no-deblock=1:no-sao=1" -flags +bitexact -fflags +bitexact -map_metadata -1 "test_x265_FinaleFinal.mkv"

Full command log attached.



Out of ideas... Any suggestion?