-4, --shrink-insane
Set the compression level to "insane" using the zopfli compressor. You can define the compressor iterations with the -i, --iter option.
-i, --iter N(umber of) and NOT -N
the 7-Zip LZMA algorithm is available with the -N option
don't use the -N option then you get no lzma
and DON'T use it for creating with advzip -a OR --add because this will lead to said problems with meta.inf being shrinked too.
use ONLY advzip -z OR --recompress +the options I gave you with an already zipped! epub.
Quote:
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As for your command line, what is it intended to do?
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it "tightens" the deflate oppression streams in an epub file that has to be already present.
Again: don't use advzip for creating epub for said need having meta.inf remain unshrinked, don't use the -N option. Rezip only.
Reading as in RTFM
https://www.advancemame.it/doc-advzip