@akwant: Those messages can be ignored
@pepak: The available conversion options change depending on input and output formats. For example LRF supportf font embedding while MOBI does not. In order to generate the options list, ebook-convert needs to know the desired input and output formats.
You don't need to specify the output file just the file extension, in which case the output is derived from the iinput file name. For example:
ebook-convert myfile.mobi .epub
will result in myfile.epub
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