Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Video Encoding > MPEG-4 AVC / H.264

Reply
 
Thread Tools Search this Thread Display Modes
Old 20th July 2013, 03:56   #41  |  Link
drmpeg
Registered User
 
Join Date: Jan 2003
Location: Silicon Valley
Posts: 455
Quote:
Originally Posted by benwaggoner View Post
Why? I would have thought that "non-constant" would refer to the 12-bit mode with high dynamic range luma, which has a different, steeper gamma for high values.
They're two different things. Transfer characteristics selects a gamma and matrix coefficients selects the way RGB is converted to/from YCbCr.

For the transfer characteristics (--transfer), bt2020-10 selects the normal gamma (same as BT.709) and bt2020-12 selects the steeper gamma.

For the matrix coefficients (--colormatrix), bt2020nc selects a non-constant luminance system (same as BT.709 but with different coefficients) and bt2020c selects a constant luminance system.

http://www.itu.int/rec/R-REC-BT.2020-0-201208-I/en

Ron
__________________
HD MPEG-2 Test Patterns http://www.w6rz.net
drmpeg is offline   Reply With Quote
Old 20th July 2013, 04:30   #42  |  Link
drmpeg
Registered User
 
Join Date: Jan 2003
Location: Silicon Valley
Posts: 455
Here's a document that goes deep on the constant/non-constant luminance issue.

http://www.itu.int/dms_pub/itu-r/opb...2012-PDF-E.pdf

Ron
__________________
HD MPEG-2 Test Patterns http://www.w6rz.net
drmpeg is offline   Reply With Quote
Old 20th July 2013, 21:24   #43  |  Link
benwaggoner
Moderator
 
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,366
Quote:
Originally Posted by drmpeg View Post
Here's a document that goes deep on the constant/non-constant luminance issue.

http://www.itu.int/dms_pub/itu-r/opb...2012-PDF-E.pdf
Thanks. I'll check it out.
__________________
Ben Waggoner
Principal Video Specialist, Amazon Prime Video

My Compression Book
benwaggoner is offline   Reply With Quote
Old 22nd July 2013, 11:05   #44  |  Link
Lyris
Registered User
 
Join Date: Sep 2007
Location: Europe
Posts: 601
Quote:
Originally Posted by mp3dom View Post
Since the topic also mentions greater color depth, I would like to point out the Panasonic "Master Grade Video Coding". There are not a lot of infos about it, but seems that the hint is to use the bluray MVC structure to use the base view as the standard image, and the dependent view for increase the bit depth of the video. Panasonic players with MGVC support should be able to 'merge' the MVC and outputs a 2D video with up to 12bit informations. Also, this method allows to fully use the 60 Mbps of the bluray 3D specs.
Here some explanation (JP)
Wow - and this is from April! Thanks for posting that, I didn't know anything about it.
Lyris is offline   Reply With Quote
Old 22nd July 2013, 11:24   #45  |  Link
pandy
Registered User
 
Join Date: Mar 2006
Posts: 1,051
Quote:
Originally Posted by sneaker_ger View Post
(Plus it only outputs RGB).
Nope - you can use RGB output as YPbPr :

http://forum.doom9.org/showthread.ph...99#post1604899
http://forum.doom9.org/showthread.ph...80#post1604480

Any RGB video output can be turned to YPbPr.
pandy is offline   Reply With Quote
Old 1st August 2013, 01:27   #46  |  Link
foxyshadis
ангел смерти
 
foxyshadis's Avatar
 
Join Date: Nov 2004
Location: Lost
Posts: 9,554
Quote:
Originally Posted by drmpeg View Post
Here's a document that goes deep on the constant/non-constant luminance issue.

http://www.itu.int/dms_pub/itu-r/opb...2012-PDF-E.pdf

Ron
Constant in this case means linear, right? Whoa, I had no idea 2020 supported that, and that actually makes 12- and 16-bit useful! Especially combined with the wider gamut. It really has everything a visual quality geek could want, I hope other color systems die in a hurry.
foxyshadis is offline   Reply With Quote
Old 30th October 2015, 19:23   #47  |  Link
LigH
German doom9/Gleitz SuMo
 
LigH's Avatar
 
Join Date: Oct 2001
Location: Germany, rural Altmark
Posts: 6,619
Quote:
Originally Posted by mp3dom View Post
Since the topic also mentions greater color depth, I would like to point out the Panasonic "Master Grade Video Coding". There are not a lot of infos about it...
Some details and further links in English in the avsforum

More details also in German in the bluray-disc.de lexikon

A thread in the VideoHelp forum pointed out that Studio Ghibli appears to sell some (but the thread starter may not have bought those, so, well ... at least this part of the thread is not a valid topic here).

Common Blu-ray players seem to handle the MVC stream but not the substream with additional color depth.
__________________

New German Gleitz board
MediaFire: x264 | x265 | VPx | AOM | Xvid

Last edited by LigH; 30th October 2015 at 19:25.
LigH is offline   Reply With Quote
Old 30th December 2020, 15:04   #48  |  Link
Balling
Registered User
 
Join Date: Feb 2020
Posts: 472
Lol, that is not that simple! First of all Y values of 16-235 can be more than 235 and should be presented, that is called Superwhite and has nothing to do with xvYCC. xvYCC may use 241-254 Cb, Cr (as 0 and 255 are reserved for synch in HDMI, but not reserved in files, of course), but that does not mean that values lower than 241 cannot be in xvYCC. For example, YCC=135,155,12 is translated into RGB=-43,184,184, that is in xvYCC. See https://www.avsforum.com/threads/xvy...ation.1170632/

Last edited by Balling; 30th December 2020 at 17:05.
Balling is offline   Reply With Quote
Old 30th December 2020, 15:21   #49  |  Link
SeeMoreDigital
Life's clearer in 4K UHD
 
SeeMoreDigital's Avatar
 
Join Date: Jun 2003
Location: Notts, UK
Posts: 12,115
Wow...

This topic was started way back in Oct 2012 and last posted in Oct 2015...

Things have moved on!
__________________
| I've been testing hardware media playback devices and software A/V encoders and decoders since 2001 | My Network Layout & A/V Gear |
SeeMoreDigital is online now   Reply With Quote
Old 30th December 2020, 16:46   #50  |  Link
Balling
Registered User
 
Join Date: Feb 2020
Posts: 472
Quote:
Originally Posted by SeeMoreDigital View Post
Wow...

This topic was started way back in Oct 2012 and last posted in Oct 2015...

Things have moved on!
No, they did not. Apple 4K TV uses xvYCC601 even for Dolby Vision. https://www.avsforum.com/threads/202.../post-60360409

Last edited by Balling; 30th December 2020 at 16:50.
Balling is offline   Reply With Quote
Old 30th December 2020, 16:55   #51  |  Link
Balling
Registered User
 
Join Date: Feb 2020
Posts: 472
To convert that properly to modern BT.2020 HDR one will need to use XYZ matrixes (also in the standard). May be interesting to implement. Kodak PhotoCD imagery also used the same OETF function for encoding.
Balling is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 18:04.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.