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L33THAK0R: Very input data dependent! Older, very older gamez, betterly compressible than previous 10-15 years ago to last years games. Average few percent to upto 10-25% betterly final compression ratio than LZMA. After, many data precompression (ex: xtool), prefiltering (ex: exe/delta) and such more...
Simply, this cannot be said in advance! It is necessary to experiment, it is possible to derive approximate information about the possible degree of compression from existing repacked games online.
Small examples: This very old modded MSTS games *.ACE files with xzlib+srep+lolz combo avg. 25-40% final ratio than uncompressed sizes.
*.RAW files in rare case upto 1.5-2* betterly compressed via delta+(srep)+lolz combo than simple LZMA only.
Sound files final sizes difference its minimal few percentage. Achieve better rates use sound specific compression.
KaktoR: What "mpsarc"??
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