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23rd January 2019, 02:11 | #1 | Link | |
Herr
Join Date: Apr 2009
Location: North Europe
Posts: 556
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Setting the correct colormatrix in x265?
Hi, I read this old thread about wheather to set or not set colormatrix-information in x264,
Quote:
Nowadays, with more advanced TV:s and standard 10-bit setting on H.265-encoders (with GPU-decode support for that), is it more important now to set colormatrix? And bt2020nc should be set for 10-bit UHD-reencodes, right?! I'd assume that it's most important to set colormatrix for UHD HDR-reencodes. EDIT: Thanks excellentswordfight! Last edited by Forteen88; 23rd January 2019 at 20:34. Reason: thanking |
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23rd January 2019, 16:13 | #2 | Link | |
Lost my old account :(
Join Date: Jul 2017
Posts: 325
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Quote:
Last edited by excellentswordfight; 23rd January 2019 at 16:16. |
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23rd January 2019, 21:28 | #3 | Link | |
Moderator
Join Date: Jan 2006
Location: Portland, OR
Posts: 4,770
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Quote:
In the modern era, I strongly encourage everyone to set those metadata flags for all content, and set them correctly. The hoops devices run through to try to guess can beggar the mind... 709<>601, so I recommend setting it for SDR content too. |
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25th January 2019, 16:40 | #4 | Link | |
Herr
Join Date: Apr 2009
Location: North Europe
Posts: 556
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So is there a way to find out the source-video's colormatrix except looking if there's VUI-info about that (viewable in a program like MediaInfo)?
For the Disney short "Presto" Blu-ray, MediaInfo says: Quote:
EDIT: Thanks nevcairiel. And yeah, to be clear, the 'Presto' Blu-ray I tested was 1080p HD video-source. Last edited by Forteen88; 25th January 2019 at 17:36. Reason: thanking |
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25th January 2019, 16:55 | #5 | Link |
Registered Developer
Join Date: Mar 2010
Location: Hamburg/Germany
Posts: 10,346
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If there is no info in the video bitstream, all you can do is guess. An educated guess in most cases accounting for source, resolution, etc, but a guess nonetheless.
Most HD video is in 99.9% of all cases BT.709 all the way through just like your example. UHD can be either.
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