I am trying to use pdfjam to take a PDF file and output another, where each page results from vertically joining two pages of the original. However, for some reason, the output file is completely blank, even if it has the right number of pages.
What I am doing is just opening the terminal in the desired location, and typing:
pdfjam --nup 1x2 --suffix two-on-one --a4paper input_file.pdf -o output_file.pdf
I'm desperate to find out what is going on. Help, please!
Also, if you don't know what is happening but can suggest another method for achieving the same result, that would be great, as I desperately need this to work soon.