Re:Netflix is now doing per-shot encoding for UHD content
by bscphil on Friday August 28, 2020 @10:13PM
(#24312721)
> You can't ABR adapt without aligned GOP boundaries.
Yes, that's true of course, but not really relevant to whether you could port Netflix's work on scene-adaptive rate control to x264. Maybe you'd lose aligned GOPs... but for a lot of purposes (offline?) that doesn't matter.
> Of course not, that's why the perform an analysis of both options and select the better one. That's what the algorithm does...
The only point I've ever tried to make on this subject is that in some cases this approach fails. "Perform an analysis" is such a high level description that it misses the fact that this is being done according to some objective metric that may disagree with an individual viewer's personal preferences or viewing environment. In fact, just because an objective metric says 4k > 1080p doesn't mean the difference will be noticeable at the viewing distance the viewer is at, whereas the additional artifacts introduced by moving from 1080 -> 4k without a significant bitrate increase may very well be visible!
Yes, that's true of course, but not really relevant to whether you could port Netflix's work on scene-adaptive rate control to x264. Maybe you'd lose aligned GOPs... but for a lot of purposes (offline?) that doesn't matter.
> Of course not, that's why the perform an analysis of both options and select the better one. That's what the algorithm does...
The only point I've ever tried to make on this subject is that in some cases this approach fails. "Perform an analysis" is such a high level description that it misses the fact that this is being done according to some objective metric that may disagree with an individual viewer's personal preferences or viewing environment. In fact, just because an objective metric says 4k > 1080p doesn't mean the difference will be noticeable at the viewing distance the viewer is at, whereas the additional artifacts introduced by moving from 1080 -> 4k without a significant bitrate increase may very well be visible!