Thanks for your prompt reply
Originally Posted by stewacide
but using MobiPocket as the front-end results in a final .ePub that looks like an official ePub, for a book that's very unlikely to ever get an ebook release. Would be amazing if Calibre could do this itself, but it's really focused on transcoding between well-formed XML formats, not intelligently dealing with layout issued from a PDF.
The way through Pdf->MobiPocket(.html)->Calibre(epub) is actually what I did. And how to make an ePub with MobiPocket without using calibre?
There is no obvious choice to convert to .epub or .mobi. There is an option to make epub but the result is a punch of files;.html, .opf, .prc, .xml, .jpg, .png