Napoléon 4K UHD (1927) Abel Gance - Grande Version • Potemkine. pre-order

[Akibiyori]

Originally Posted by Hedrox

It sounds worse than it is, if it's handled well you shouldn't be able to notice it.

You DO notice it because it’s always there and you can’t do anything about it.

Interlacing, on the other hand, with proper equipment actually IS invisible and plays back smoothly. We can’t have that anymore though, it’s impossible with 4K.

[Deciazulado]

Originally Posted by Akibiyori

You DO notice it because it’s always there and you can’t do anything about it.

Interlacing, on the other hand, with proper equipment actually IS invisible and plays back smoothly. We can’t have that anymore though, it’s impossible with 4K.

Interlacing is/was 60i 1080* (60 interlaced fields (Fields are half frames, effectively frames with half the lines, 540, with 540 empty spaces or "black lines" in between those 540 picture line fields alternating position 60 times a second (60Hz) (50Hz PAL) )

*(486/576 on NTSC/PAL)

In other words:

Field 1, first 1/60th of a second-
Line 1 picture
Line 2 empty
Line 3 picture
Line 4 empty
etc.

Field 2, second 1/60th of a second-
Line 1 empty
Line 2 picture
Line 3 empty
Line 4 picture
etc.

(for PAL countries, each 1/50th of a second or 50Hz)

instead of a full 1080 line frame every 60th of a second (or 50th).


UHD can do 60p and 50p, or 60 full frames per second and 50 fps, a full 2160 line frame every 60th of a second (or 50th).

Gemini Man 4K and Billy Lynn's Long Halftime Walk 4K are 2 examples of 60 frame per second movies with 2160p60 4K UHDs

So theoretically UHD can reproduce NTSC/PAL/HDTV/BD's 50/60Hz interlace 2 ways:

They could encode the interlaced 60i pull downs by making each of the 60 (or 50) progressive frames of the 60/50 interlace video on the disc be half frames: For 2160, insert alternating 1080 black lines between 1080 picture lines making each of the individual 1/60th 2160p frames be effectively a simulated 2160i60 interlace field.

Or they could do what all HDTV's de-interlacers do when presented with an 60i/50i HDTV transmision or disc: deinterlace it and present it to the progressive HDTV panel as deinterlaced progressive frames, but already done in the disc. All HDTVs do this as they are all progressive panel TVs: you see all your interlaced discs, videocamera video and TV broadcasts as 60p or 50p on your TV and computer monitors. And if your computer monitor is set at 60Hz refresh rate or 72Hz, 120Hz, etc. and you watch a video on the internet like a youtube video and the video is not at your refresh rate (I've seen tubes at 24/25/30/50/60 and others) you computer/monitor is changing their display rate (not their speed) on the fly to fit on your monitor's refreshing rate.

So they could do this in the studio beforehand and master interlaced material into progressive 60p/50p UHD discs with their professional deinterlacers and have that on the disc instead of your HDTV doing it.
Or better yet they could use the digital tools to translate the true "progressive" film frames at the different film rate directly into the 60p rate container without having to interlace them first, and having them have to be deinterlaced back to progressive a second time.

When I saw this announced that's one of the first things I wondered if it could be a 60p disc to deal better with the frame rate issue.
If it was a 20fps movie each frame would be repeated 3 times and look exactly like in 20fps.
For 18fps into 60p, you can do:

111222333344455566667778889999 etc. with the 3-repeat frames total lasting 0.050 seconds and the 4-repeat frames 0.066 seconds, (a difference of 0.016 sec, 1/60th of a second) instead of the 18fps' 0.056 seconds each.
or
111222333(3+4)444555666(6+7)777888999(9+10) etc.
the (A+B) blended frames (lasting the visual equivalent of 0.058 sec) would look like like a 1/60th of a second dissolve frame smooth transition, taking the place of having an interlace field from one film frame and the other interlaced field from the next frame interpolated (estimated) onto a frame inserted on the fly by a TV de-interlacer .

(Only a true interlaced TV like a CRT would display the "A" field first then the next field "B" 1/60th of a second latter without displaying both simultaneously as a Venetian blind frame ("combed") from interlaced material without creating a new in between frame. But if you look closely you could see the combing with movement even on a true interlaced CRT TV)

They could just do that, create a new interpolated true transition frame digitally directly, or film rates, instead of a simple "blended" frame (dissolved) transition or one estimated by a deinterlacer, at more expense and time but I think the 1/60th of a second micro-dissolve would be enough, you know, with persistence of vision and all that jazz, and be more "authentic".


We are not getting 18fps or 54p/72p discs/disc players or VFR/VRR anytime soon.