Best Compression Methods for 'Specific' Games. Q&A

[KaktoR]

Divinity Original Sin 2 Definitive Edition
v27.09.2022, Nothing ripped, bonus contents are included (Artbook, Lorebook, Concept Art, Soundtrack)

 18:42:24 - Selected ARC/DS method for Data1a-01.bin was: xtool:mdos2de:mpreflate+srep_new:3+lzma_sdk
 18:42:24 - Selected ARC/SPLIT method for Data1b-01.bin was: srep_new:3+lzma_sdk/$mp3pack=mpz_pmt/$jpgpack=xtool:mbrunsli/$deflatepack=xtool:mreflate+srep_new:3+lzma_sdk
 18:42:24 - Selected ARC/DS method for Data1c-01.bin was: bpk
 18:42:24 - Selected ARC/DS method for Data1d-01.bin was: 1
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 21:28:17 - Overall input size: 60.50 GB
 21:28:17 - Overall output size: 34.01 GB (Ratio 56.21%)
 21:28:17 - Overall conversion time: 02:45:51
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 22:03:03 - All files have been successfully extracted!

Paks are using lz4hc with level 9 and some reflate streams.
However not all lz4 streams can be processed.
To get a good amount of streams set --diff=20p in arc.ini (the sweatspot is somewhere between 15p and 20p, I used 20p. Above this you will get negative ratios on some files. The higher #p, the more negative ratio) and use xdelta3_dll.dll near xtool.exe

Due to false detection by xtool use preflate, not reflate. If you use reflate you will get crc errors on extraction.
For xtl creation use lspk.bms and in bms2xtl.ini set lz4=lz4hc:l9
Use liblz4 180

bpk information

Data1c
Data\Localization\Video.pak
Data\Localization\Video_1.pak
Data\Localization\Video_2.pak
Data\Localization\Video_3.pak
Data\Localization\Video_4.pak
DefEd\Data\Localization\Video.pak

Data1d (crc errors on extraction, don't use bpk on them, or extract the archives first and use binkpatch)
DefEd\Data\Localization\Video_1.pak
DefEd\Data\Localization\Video_2.pak
DefEd\Data\Localization\Video_3.pak
DefEd\Data\Localization\Video_4.pak

Thanks to Razor12911 and Masquerade for some informations