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The cover is indeed called cover.jpg in the calibre library, when converting cover.jpg is copied into the epub zip and renamed to cover.jpeg. My guess is that it reads the name of the cover from content.opf (manifest) inside the source epub:
<manifest>
<item href="cover.jpeg" id="cover" media-type="image/jpeg"/>
Is there a way to changes this behavior i.e.have calibre change the opf so that it says cover.jpg?
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