Quote:
Originally Posted by dwanthny
The opf file discussed here is the opf file found in the calibre library book folder and is not copyrighted. This file is created by calibre and used to restore the database in the event of catastrophic metadata.db failure.
This file also is not sent to the ereader when you send the epub, so this file shouldn't have anything to do with slowness of ereader opening the epub.
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thanks for backing me up on point 1. the opf content which I uploaded is indeed what calibre downloads from public domian amazon.com when asked to fetch metadata , and so is NOT copyright
re point 2. surely the ofp is also part of the epub ( zip ) bundle and thus does get into the reader, and does get into calibre when only the .epub is imported.. if I unzip my source .epub I see a file called content.ofp in the bundle. this contains the same data as a calibre metadata download.
I have no other explanation
for epub with original (large) ofp = very slow to open; epub with edited ( short) ofp, opens normally.
it is not "normal" for downloaded metadata to contain an entire "sample chapter", I have no other instances of that, & no other books that take 30+secs to open!
so, having googled .opf files, I would guess that the delay is caused by reader software having to parse a whole HTML book chapter when analysing the large .opf. It's also maybe relevant that on sony, I can open book ( 30+secs), close it, then re-open it & it opens immediately the 2nd time ( opf analysis buffered ??? ) . But if I open another book in between I'm back to the v slow issue.