What is the "VCD" in VCD compression? When I search for it I get a medical paper with the sentence "Manual compression (MC) and vascular closure device (VCD)", which I somehow doubt is what the acronym stands for in this context :p

Yes, you are right. Added a link to Wiki

Anyway, this is really cool! Is this a specific benchmark for a use-case you have, or attempting to be more generic?

Yes, VCD files are large and has very specific structures, and I was interested to see which compressor do the best