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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?
pdftk
https://www.pdflabs.com/tools/pdftk-server/
(hmm, can’t add image to pdf i don’t think, although can merge and edit metadata on pdf)
combine_pdf
yet another ruby pdf library. is one thing I found to let us edit metadata (ie Info Dictionary) on existing pdf. Could maybe also do other useful stuff for us.
https://github.com/boazsegev/combine_pdf
nope just tried using it to edit metadata on a very large PDF, it used a ton of RAM.
Uncaching on-demand derivatives
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