> Can someone explain the compression option for chdman? > > --compression, -c : which compression codecs to > use (up to 4) > > I notice when a chd is being copied, I see... > Compression: lzma (LZMA), zlib (Deflate), huff (Huffman), flac (FLAC) listed.
> Is the best compressor automatically picked by chdman? Is each hunk compressed by each > codec and the smallest size is what is used in the chd file?
well, that's the main reason to have multiple codecs, isn't it? so yeah, chdman tests for each chunk the best compression and chooses it but you can manually force a specific compression for the whole CHD (or no compression, e.g. to create writable CHDs for MESS) by using the -c option
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