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17th July 2010, 10:02 | #1 | Link |
Telewhining
Join Date: Mar 2010
Posts: 272
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--tune grain on BluRay sources
I've noticed that most BluRay movies are mastered with a lot of grain. I've always used --tune film on my encodes but am wondering if the grain setting may help with BluRays and prevent banding/blocking.
Does anyone here use mostly --tune grain and if so, does it usually require a higher bitrate, and do fast action scenes suffer due to bandwidth allocation when compared to --tune film? |
20th July 2010, 05:49 | #2 | Link |
Telewhining
Join Date: Mar 2010
Posts: 272
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Okay so I've run some tests on --tune grain vs --tune film with some BluRay sources.
Tune grain definitely helps keep a little more detail, and more grain (imagine that?) As a result, a higher bitrate is required, and with CRF so far it has required about 25% more bitrate to keep the same quality. High motion scenes look fine so far. So I guess it comes out to whether you want all the details and bits of grain preserved along with slightly larger file sizes. Here is a comparison of film vs grain screenshots: film: http://dl.dropbox.com/u/5637223/Iron...2.33.58%5D.png grain: http://dl.dropbox.com/u/5637223/Iron...2.33.26%5D.png It's a small difference, but when expanded to 1080p it becomes a little more apparent. |
20th July 2010, 10:54 | #6 | Link | |
Telewhining
Join Date: Mar 2010
Posts: 272
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Quote:
Code:
TTempsmooth(maxr=7, fp=true, strength=1, lthresh=3, cthresh=4) SMDegrain(tr=1, thSAD=100,blksize=8,overlap=4) dfttest(dither=3,sigma=3,sigma2=3,tbsize=3) LSFMod(defaults="slow",strength=50) Well part of the point was not necessarily quality but how much more bitrate --grain takes in comparison. I will run a 2 pass at a specific bitrate with both tunings and post that as well, because obviously the --tune grain image is using more bitrate (about 500kbps). |
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20th July 2010, 14:34 | #7 | Link | |
Aging Video Hobbyist
Join Date: Dec 2004
Location: Off the Map
Posts: 2,461
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Quote:
So I use --tune film most of the time and don't otherwise think about it. Ironman is a newer film with very fine grain so I wouldn't use --tune grain with it. |
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20th July 2010, 22:15 | #9 | Link |
契約者
Join Date: Jun 2008
Posts: 1,576
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You can't save that DFFTest's dither. This dither is just not good enough. It's unbelievably small like 1px dots and gets killed even by resize so even if you'll manage to keep it - it can be lost on playback :Р
Last edited by Keiyakusha; 20th July 2010 at 22:28. |
21st July 2010, 15:27 | #11 | Link |
契約者
Join Date: Jun 2008
Posts: 1,576
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Well of course if you using something like dither=3, it won't be killed entirely, but I can't imagine where such settings is not overkill since even on totally flat animation dither=2 is enough to fill all gradients. Normally you shouldn't use more than dither=1. For BD film sources I haven't found much use of this dither at all. Such films already contain enough amount of grain to look good so dfftest just replacing bigger grain (which is easier to compress and which is meant to be there) with smaller grain (which is harder to compress and which is not meant to be there).
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Tags |
--tune grain, grain |
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