Thread: Exported ePUBs stay the same, exported PDFs always change.
View Single Post
Old 01-06-2021, 02:20 AM   #1
halloleo
Groupie
halloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameterhalloleo can solve quadratic equations while standing on his or her head reciting poetry in iambic pentameter
 
Posts: 156
Karma: 12649
Join Date: Feb 2020
Device: iPad
Exported ePUBs stay the same, exported PDFs always change.
I regularly export my library (to make the books available to tools) via calibredb export.

I export the books into a temp directory and then compare with the last export.

In doing so I have noticed that ePUB files stay fully the same when no change to the metadata in calibre has happened since the last export. (And thus I have no need to copy them to the final destination.)

However PDF files seem to change even when no modification to the metadata in calibre has happened. This is pretty annoying, because it means I have to copy the PDFs to the destination even if nothing has changed. The change seems to be only on the byte level, when looking at the PDF it looks still the same, of course.

Why do PDFs not behave like ePUBs and how can I avoid it?

ps: I use the options --single-dir --progress --dont-write-opf --dont-save-cover.

pps: I cannot use --dont-update-metadata, because I need the calibre metadata in the exported file.
halloleo is offline   Reply With Quote