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Old 27-02-2021, 10:08
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Use a version near game release date (month / week) if possible and go downwards in libzstd versions until you reach a peak in precompression. I don't know if there is a proper way to detect what zstandard version the game was packed. But that's basically what I do (same with lz4).
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Old 28-02-2021, 01:49
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Talking

I talked to spiritiovod and he managed to help identify that the version used was v1.4.4 of libzstd. Added that to zstdrec and wowzers:

Code:
Compressed 1 file, 15,471,886,944 => 31,903,067,738 bytes. Ratio 206.20%
Compression time: cpu 18.23 sec/real 1843.42 sec = 1%. Speed 8.39 mB/s
All OK
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