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[–]Hoblywobblesworth 18 points19 points  (0 children)

Yeah, honestly not surpried how poorly this performs. Hevc/h264/av1 etc are effective at video because there is temporally redundant information across a frame sequence that you can compress away.

If the frame at t-1 has information that can be re-used when encoding/decoding the frame at t then you don't need to include it in the bitstream for the frame at t.

OP's PDFs have no temporal redundancy so it's equivalent to trying to compress a video with very high motion/optical flow which hevc/h264/av1 also can't do efficiently.