I know this is an old thread but perhaps this might help new users:
Useful links for new complied versions can be found here:
https://mupdf.readthedocs.io/en/1.26.11/
https://github.com/ArtifexSoftware/mupdf
https://mupdf.com/releases?product=MuPDF
This web site allows free use of MuTool on line:
https://www.sejda.com/split-pdf-down-the-middle
If you use Windows and Chocolatey then:
choco install mupdf
will install the latest version.
Syntax is:
mutool poster -r -x 2 1.pdf 1a.pdf
D:\Downloads\mupdf-1.26.2-windows>mutool poster
usage: mutool poster [options] input.pdf [output.pdf]
-p - password
-m - margin (overlap) between pages (pts, or %)
-x x decimation factor
-y y decimation factor
-r split right-to-left
and so this:
mutool poster -r -x 2 1.pdf 1a.pdf
will 'cut' a dual page PDF into a single multipage PDF of separate left & right pages.
See also: