I haven’t tested / used this code yet, so I can’t say how compressions compare (if data is being optimally ordered for FLAC etc.) but you should see substantial gains, even over the previous versions I posted due to the use of LZMA which in tests on regular romsets usually yields around a 20% improvement in compression. This includes a refined / cleaned up version of the FLAC support I was working on (which is now official) as well as a number of other improvements (LZMA support based on the 7-zip code is also in there) Aaron has checked in a change to the CHD format featuring his further work on the format, and bumping the version to v5.
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