Quote:
Originally Posted by Jellby
I think I probably missed the fact that advzip could be messing with the mimetype file. So far, I haven't had any problems, either in an actual reader (Kobo) or in calibre (including the "check book" option in the editor), so it could be that advzip is actually not touching the mimetype.
Anyway, the file is so small that even adding it with -X9 results in it being stored without compression.
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From what I saw in the advzip documentation, 1-4 will check the file and store as uncompressed, with original compression or re-compressed depending on which gives the smaller file size. I suspect the mimetype file is so small that it will not be compressed but you are rolling the dice. Asides, I am not a fan of zopfli -- it is so damned slow.