[simonhorlick]

They measured video quality subjectively. I don't think you can just take the researchers at their word that it "looked good enough". Any rigorous video quality test would use at least some kind of objective numeric measurement.

[sgt101]

Which is generally misleading as human attention focus's on a golfball size area of the screen at any moment, and codecs take advantage of this. So you might get a higher numeric score for a much poorer subjective experience.