I tried again, as mentioned in my previous post, with a new version of the file that was much cleaner.
Again it failed, but the error message was much more useful this time:
Quote:
calibre, version 2.42.0
ERROR: Conversion Failed: <p><b>Failed to convert: ' dul ba mdo rtsa ba'i mchan 'grel mthong ba don 'grub<p>
Many older ebook reader devices are incapable of displaying
EPUB files that have internal components over a certain size.
Therefore, when converting to EPUB, calibre automatically tries
to split up the EPUB into smaller sized pieces. For some
files that are large undifferentiated blocks of text, this
splitting fails.
<p>You can <b>work around the problem</b> by either increasing the
maximum split size under EPUB Output in the conversion dialog,
or by turning on Heuristic Processing, also in the conversion
dialog. Note that if you make the maximum split size too large,
your ebook reader may have trouble with the EPUB.
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I will try the suggestions mentioned there... Otherwise I can try editing the file some more.
The problem is that Tibetan is a complex font that does not have actual spaces. Using MS Word you can set the justification to "Thai Justification" to fix this, or you can insert zero-width breaks at every dot (every syllable is separated by a dot). I had run a macro to do this, but maybe Calibre did not pick up the zero width spaces? In any case, I can probably just add paragraph breaks at random points throughout the text, and that might be all that is needed...