Hmm. It's just simple DCT crap what I'm seeing there. (Those havn't changed in the last ten years.) - The artifacts are not strictly vertical, and are located primarily in those 8x8 blocks that can be spotted as such. Another word for that is "blocking".
Considered using deblock()? Or, if that stuff is
not temporally persistent, then a temporal smoother could work just as well. Maybe even
more well.
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