The input format is not documented.

When a PDF file is given as the input, gs appeares on the process list
and after a while message "Killed" is written to the console withou
any additional information.

JSB

clone 572061 -1
retitle -1 cuneiform: suboptimal handling of multi-page documents
tags -1 + upstream
thanks

It is documented, although admittedly not in a very prominent place.
Quoting readme.txt:

    If you have ImageMagick++ on your system, Cuneiform autodetects and
    builds against it. Then Cuneiform can process any image that
    ImageMagick knows how to open.

Don't do that then! :)

As far as I can tell, currently all the pages are rendered and loaded to
memory (if they fit, which is usually not the case) but only the first
one is actually OCRed.