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

[hwang4]

What's Best Method for compression?

[Masquerade]

Originally Posted by hwang4

What's Best Method for compression?

This game's PKG archives are compressed using LZ4, so first you need to find a way to decompress files inside the archives. Since the header of the files appear to be encrypted, unlike previous games, there's no BMS script to unpack the PKG.

[hwang4]

Masquerade , can you show me your method plz !

I tried (xtool+srep+lolz), i got 25,5gb (english+french)!
Your method is better (21gb)
thx!

[Masquerade]

Originally Posted by hwang4

Masquerade , can you show me your method plz !

I tried (xtool+srep+lolz), i got 25,5gb (english+french)!
Your method is better (21gb)
thx!

I used VGM toolbox to "extract" the PKGs, since every lz4 stream is very easy to detect with the 0x04224D18 header with PKGB before the steam and PKGE after the stream. When each file is extracted, you can use lz4 exe to decompress the extracted lz4 streams, then compress with xtool:zlib+srep+lolz.

Then, to remake the pkgs, you just need to compress each file again individually with the lz4 exe using -9 --no-frame-crc arguments. Then, concatenate the files together (I use bincat for this since it's fast and simple, not sure of native cmd option) and xdelta.

Make your xdeltas before compressing your archive, since you will need to decompress all of the extracted files from the pkgs, compress them, then concatenate them to make a temp file. You can compare the temp file with the original pkg to make a delta.

For the sound files, I used razor.