Quote:
Originally Posted by Agent Kay
Wait, so how did you watch it without DV the first time?
And you don't mention the compression now and that was the main issue
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I had my OPPO set to Forced HDR which pushes the HDR10 layer of any DV disc. I didn't bother unsetting it because who knew beforehand that this disc had frickin' Dolby Vision?!?
I dunno if you've caught my posts regarding Last Jedi or Saving Private Ryan but I see some incredibad compression artefacts on their HDR10 layers, particularly SPR which I literally couldn't continue watching as it was (I turned down the colour until it was black and white), but when watching in Dobly the compression artefacts are greatly improved. Not removed outright but genuinely betterer.
My Armchair Expert™ intuition tells me it's something to do with the dual layer Dolby base + enhancement encoding process, it doesn't always hobble the HDR10 layer but the grainier the content the more chance there is of this phenom occuring. Even though an encode may be on a 100GB, even though it may have a decent enough bitrate on the face of it, when the image is as temporally unstable from frame to frame as these grain-a-thons are then the DV encoding process seems to murder the chroma channels of the HDR10 layer, devoting more bitrate to the luminance and letting the colour fend for itself.
Maybe it's that the quantization parameter for the chroma needs to be set to a lower number than what they're currently feeding it (lower number = closer to source)? Perhaps the same number that's fine (or good enough, at least) on a plain HDR10 joint needs to be set lower on a dual layer HDR10 + DV encode.