Quote:
Originally Posted by whitestang06
They seem to be greatly overestimating HEVC's encoding efficiency.
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But stuff didn't start out like this on UHD, you know? And not all titles are like this now, it seems to be certain encoders used by certain authoring houses. We had more conventional blocking artefacts for sure, stuff that shows up in the luminance channel as well but this, this ruination of the chroma channel
specifically is downright bizarre and AFAIK it first turned up on Blade Runner which would possibly indicate some sort of new encoder or new encoding settings being used, and I've spotted these green/magenta blocking artefacts on several titles since then. Not as bad as BR, as I've said already (just look at that chroma channel in the close-up of Deck that Pyoko posted and the other caps are just as bad, it's always nice to know you're not insane
when you see things most other people don't), but blocky enough to still catch my eye every now and then.
Sure, the chroma channels will be lower resolution by default because this is 4:2:0 encoded video we're talking about here, the chroma is literally running at a quarter resolution of the luminance because our eyes are quite forgiving about such things. So even if you look at the chroma channels of a masterful Sony UHD disc like Leon the chroma still looks very blocky and low res, that's because it is...but the chroma on Blade Runner is MONUMENTALLY bad and SPR, although not as rough, certainly has its moments too.
I really am no expert on this so I don't have a clue as to what actual parameters or settings in HEVC would cause such a thing, but perhaps someone came up with a bitrate 'cheat' to keep luminance perfectly preserved but which badly hacks up the chroma channels even more, figuring that the awful chroma blocking would be mistaken for grain anyway? Whatever the case may be, it's extremely disconcerting.