UHD-BD uses HEVC for UHD while BD uses AVC (generally) for HD
UHD 10bit needs 1.25x bitrate than 8bit
HEVC needs down to 0.5x bitrate to get the same AVC (subjective) quality
I guess generally HEVC requires around 0.65x bitrate of AVC
so, for each 1mbps 8bit AVC = from 1x0.5x1.25 = 0.625mpbs to 1x0.65x1.25 = 0.8125mpbs HEVC 10bit
UHD = 4x HD = 4x0.625=2,5x up to 4x0.8125=3.25x
So, if we have a supa-dupa BD with a very (and I mean it!) high bitrate, of, let's say, 36mbps, the UHD-BD, with a superb HEVC encoder should have 36x2.5=90mbps at least; now, we know that HEVC is not always twice efficient, so the bitrate should be even higher, up to 36x3.25=117mbps;
Now, according to this post (https://forum.blu-ray.com/showthread.php?t=277330) there were some UHD-BD with bitrates as low as 37mbps - and as high as 88mbps. So, while the 88mbps figure is in line with the best BD discs around (thinking that the HEVC encoded used has a 2x efficiency), the 37mbps is rather low - it must be compared to 37/2.5= 14.8mbps AVC BD at best, and 37/3.25=11.4mbps at worst... not so high bitrates, if we talks about 1.78:1 films with grain.
According to the Kush Gauge (and the Kush Gauge advanced calculator I made), to get "optimal" quality for a 1.78:1 grainy film with a lot of action, AVC will require 20.9mbps. Now, not every film is very "active", so for some movies the bitrate could be reduced even in half - around 10.4mbps - and in that case 37mbps for HEVC 10bit 2160p is enough.
Let's say that one of us wants to release his project on UHD-BD format; a BD-25 should be not enough for a feature film, while a BD-50 should do. Now, TSM2UHD has an advice to use 50mbps for BD-50, and never more than 64mbps ( even if to be compliant we can use up to 82mbps), a bitrate that is 1.35x the lowest bitrate found on commercial UHD-BD (and up to 1.72x if 64mbps will be used); a quite healthy figure - if we hope the HEVC encoder used would be as efficient as the ones used by studio (but I bet it will be not...).
A BD-50 has 46.6GiB capacity; takin in account 7% (more or less) of .m2ts and UHD-BD structure overhead, will leave around 43.66GiB for the movie; it translate to 43660MiBx8/50mbps=6985s=116m (or 43660MiBx8/64=5457s=90m). So, we can fit most of the movies at acceptable bitrates.
Do remember that 50mbps and 64mbps include audio and subs, so the final bitrate for video will be less, depending on how much audio tracks we want to add, and their quality (subs size would be negligible in comparison); I think that 46/48mbps and 60/62mbps could be easily achieved.
Conclusion: if we think the Kush Gauge is more or less right, to get optimal quality for a 2.40:1 HEVC 10bit 2160p movie with a lot of motion, we need 49.7mbps - near the lowest max bitrate limit for a BD-50. So, if we have a 1h30m action movie with one DTS-HD MA and several AC-3 tracks, we could encode it in HEVC 10bit 2160p and it will safely fit on a BD-50 using a 64mbps bitrate (around 60mbps for video), while for action movies up to 1h56m, we should lower the bitrate to 50mbps (around 44mbps for video); movies with low motion could benefit of lower compression, or longer duration.
The last deleted scene mentioned on that page is Indy's periscope ride... except I remember seeing it. I remember finding it odd that the submarine never went below periscope depth, and I have a vivid recollection of Indy waking as they approach the island, his hand wrapped in his whip's coils and he coughs on some sea water.
Did this actually appear in a broadcast (maybe cable) or a VHS release? It has been making me crazy for years and I'd like to see the scene again (possibly restored).
Edit: To be clear. My memory is that his whip was coiled up with his arm through it, nothing like how it looks in the graphic novel. So that's not what I'm remembering.
After a while, I've found some ways to convert HDR 10bit bt.2020 video to SDR 8bit bt.709
Don't know which is better, so if anyone, after have tried them, want to chime in, it will help!
Script 1A
Code:
#Indexing
FFVideoSource("any_HDR_video.mkv")
#From 10bit to 16bit
ConvertBits(16)
#Reverse upscale to FULL HD with 16bit precision
#(optional)
#DeBilinearResizeMT(1920, 1080)
#From YUV to XYZ with 16bit precision
ConvertYUVtoXYZ(Color=0, OutputMode=1, HDRMode=0, fullrange=false)
#Tone-mapping with 16bit precision
#(of course values could/should? be changed)
ConvertXYZ_Reinhard_HDRtoSDR(exposure_X=14.0, contrast_X=0.5, exposure_Y=14.0, contrast_Y=0.5, exposure_Z=14.0, contrast_Z=0.5)
#From XYZ back to YUV 4:4:4 with 16bit precision
ConvertXYZtoYUV(pColor=0)
#Converting back to 4:2:0 with 16bit precision
Converttoyuv420(interlaced=false, matrix="Rec.709")
#Dithering to 8bit with the Floyd-Steinberg error diffusion
ConvertBits(bits=8, dither=1)
DGHable
# you can always play with the exposure:
# DGHable(exposure=1.0)
# (replace 1.0 with your own value)
# Reinhard could also be used:
# DGReinhard
I was wondering if anyone here could sync the 2.0 and the 5.1 mixes from the 1997 DVD Goldeneye to the 2160p WebRip that is circulating the net. From what I read online, the mixes are different (more LFE than the later releases)
This is something I got in my mind since a (relatively) long time...
As I have no idea how to do that, I should start from scratch. I do not have an UHD-BD player as well, but luckily a friend of mine with one would (should) be happy to be my "project guinea pig"!
Said so, first I want to find out some test or demo clips in UHD, to use as source - something possibly interesting, fun, or simply eye candies! Got some ideas, though...
Then, if not encoded in h.265, I'd like to do it following the right settings - that frankly I do not know (yet): for the moment, I'd prefer to leave HDR out of the equation, possibly adding it back in the future.
After that, I plan to make a simple BD folder with TSmuxeR, then fix it with TSM2UHD to make it UHD-BD compliant, and finally burn to a BD-R (BD-25 should suffice for the first time)
So, got some questions:
Has anyone attempted (or released) a project on UHD-BD?
Is someone aware of which h.265 settings I should use to make compliant files?
Answers to this questions would be a nice starting point, but if you have any other thoughts, I'm all ears!
Source: HDTV 1080i (Logo pictogram -12 in the black bars)
Cropped and re encoded in 720p (No Logo) FRENCH: DD 5.1 448 Kbps (DVD NTSC R1) ENGLISH Subtitles @ SRT (DVD NTSC R1)
First preservation with multi language audio tracks &
First preservation with untouched LD AC-3 track:
Star Wars: A New Hope [SET ruLes] (2013-01-02) - by spoRv - https://originaltrilogy.com/topic/Star-W...D/id/15052
Today I made my second blood donation - done first four years ago...
Why I have waited so much from the first one - and why I did not make the first before - frankly I don't know... it is a quick, almost painless procedure, but it could save a life, so I decided to make it more frequently - as much as I can.
So, I'm making a custom BD of a film (Fate/Stay Night Heaven's Feel 1. presage flower), and using different sources. The video is the IT BD from Dynit which has slightly better compression and has less banding than the JP BD. However, there's no English subtitles. The JP BD has them, and because I know the compressionist in Italy who did it, it has the same timing as the JP BD which makes adding subs for viewing on a PC easy.
However, I prefer to view films off a disc whenever possible. I downloaded the subs of the JP BD, but they're in a file format I'm not familiar with- .SUP
The BD format uses .PGS subtitles, so I was curious- would they need to be converted to make a self-authored disc? And if so, how?
(Also, if I were to do a 1:1 lossless version using the .m2ts file, would I rip it encrypted or unencrypted?)
Sorry for the n00b questions- I've been a PQ snob and finally decided to make custom BDs. (I may be helping out someone do a custom of Suspiria '77, so this would come in handy.)
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