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#1 | Link | |
Video Fanatic
Join Date: Jul 2021
Location: Surrey
Posts: 89
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Chroma subsampling : 4:2:0 (Type 1 / Type 0)
I've been experimenting with DVDFab for Blu-ray to x265 (I'm happy with a CLI but find tools with GUIs fun to play around with, like Staxrip - never Handbrake as it's horrible) conversion and found - annoyingly, after converting about a dozen films - an oddity with the output.
For some reason, the blacks are washed out and I believe it's down to the chroma subsampling it's using. Partial mediainfo output (I know it's 8-bit which I wouldn't normally choose for HEVC). Quote:
Here's a simple demonstration of the issue - the grey area should be black. ![]() Direct link to png: https://i.ibb.co/CHfwnwZ/dvdfab-outp...roma-issue.png Any thoughts on the matter are much appreciated.
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#2 | Link |
Pig on the wing
Join Date: Mar 2002
Location: Finland
Posts: 5,817
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I think color range should be limited instead of full. If it's encoded with the wrong settings, it needs to be redone to correct it.
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#3 | Link |
Life's clearer in 4K UHD
Join Date: Jun 2003
Location: Notts, UK
Posts: 12,343
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For 4K UHD I recommend that you always encode in 10-bit, not 8-bit...
But as with any re-encoding it all depends on your characteristics of your source content.
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Last edited by SeeMoreDigital; 3rd September 2021 at 19:40. |
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#4 | Link |
Video Fanatic
Join Date: Jul 2021
Location: Surrey
Posts: 89
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Yep, how silly - totally missed that. Cheers for pointing it out.
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#5 | Link |
Registered User
Join Date: Feb 2020
Posts: 572
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This is a latest experiment from myself and Jan in ffmpeg: we pass through chroma location. So if you have a jpeg image that (all jpeg does) uses center location it will pass through center to chroma loc in hevc VUI in SPS. Alas it looks like it effs up on R'G'B' JPEGs.
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#6 | Link | |
Moderator
![]() Join Date: Jan 2006
Location: Portland, OR
Posts: 4,992
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Quote:
And excellent progress! This will be a very welcome feature. |
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#7 | Link | |
Registered User
Join Date: Feb 2020
Posts: 572
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Quote:
Last edited by Balling; 19th September 2021 at 10:26. |
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Tags |
chroma subsampling, x265 |
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