Quote:
Originally Posted by Toxaris
That software does not exist. It is probably not that difficult to program if you want. Conversion is not a big deal. Editing the result, that is tricky since there are no real good ePUB3 editors.
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I don't think calibre's editor would care about epub3. As long as you didn't run an auto-fix or something, it should be able to edit and save an epub3. Mainly just a couple of tweaks to the OPF file to poof a plain-jane epub2 into an epub3, no? I mean you don't HAVE to convert everything to HTML5/CSS3 and add a nav document (though it isn't that hard). I would think a valid Sigil epub2 with just an audiofile added would be fairly painless and quick to change into an epub3. And could still be (carefully) edited/saved with calibre's editor. Just have to make sure to turn off the feature that autmatically updates the metadata when opening a calibre library book for editing (or edit the book outside of calibre's library).