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https://github.com/rrthomas/pdfjam
Progress? Merge PDFs?
One problem with those command-line ones is it makes it hard to do a progress bar like we’re doing now, if it requires downloading all the thumbs in advance, then in one command line (with no progress reported) making a PDF.
Is there a way to invoke them to “add one more image on end of PDF”, building it up one image at a time? Then we don’t need to have them all downloaded at once, and can report progress.
Or, should/could we use (any) tool to make a bunch of 1-page PDFs, then some other (command-line?) tool to “combine all these 1-page PDFs into one PDF”, which might be a fast and cheap operation?
Uncaching on-demand derivatives
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