Split each PDF page in two?

Question

I have a large number of PDF files which have two slides to a page (for printing).

The format is A4 pages each with two slides setup like so:

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Answer 1

With mupdf-1.8-windows-x64, in win10 CMD, you need to have 'poster ' (followed by space and without quotes) before the horizontal parameter (-x ). For example for a double-paged scan to PDF:

mutool poster -x 2 -y 1 C:\Users\alfie\Documents\SNM\The_Ultimate_Medicine.pdf C:\Users\alfie\Documents\ebooks\The_Ultimate_Medicine.pdf

What a wonderful tool! Merci infiniment !.. (and the output file ~9MB is only 52KB bigger than the original!)