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23rd April 2008, 12:38 | #27 | Link |
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Hi Dark Shikari,
looks like a very nice patch, but there is one thing which keeps bothering me when talking about H.264 film grain... the standard specifies a SEI film grain message which I have not seen yet in any implementation. Wouldn't there be a much bigger gain in quality if the grain was just removed with a filter, the filtered movie encoded, and the grain added with this SEI message? This would save a lot of noise from being encoded with an enourmous amount of bits... just an idea, as I don't know if there are any decoders which consider this SEI message for it is optional. Dust Signs
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The number you dialed is imaginary. Please turn your phone by 90° and try again Last edited by Dust Signs; 23rd April 2008 at 12:40. Reason: Corrected some spelling mistakes |
23rd April 2008, 13:20 | #28 | Link | |
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Quote:
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Le Sagittaire ... ;-) 1- Ateme AVC or x264 2- VP7 or RV10 only for anime 3- XviD, DivX or WMV9 |
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23rd April 2008, 13:47 | #29 | Link |
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Hi Dust Signs,
the problem is that there's no way to remove the grain without loosing any details, you can degrain and sharpen afterwards to (re-)amplify the softened details, but you are always altering the picture. If it would be that easy, you could just degrain and apply AddGrain(x.x) during playback to it. @DS Thanks for all your work on x264, this patch could be the next big step after AQ. Regards McCauley |
23rd April 2008, 16:08 | #30 | Link |
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Subjective wise this works really well especially on B-frames where prestige fails even with b-rdo (b-frames) FGO has no problems to keep the grainy Look & Feel constantly (and very visible) throughout every frame very impressive, indeed it fakes the eye really efficient and can even bring back the grain feeling after resizing
Code:
Prestige = 15.30 fps Global:45.183 Y:0.9806016 RD Prestige = 10.74 fps Global:45.404 Y:0.9799006 RD FGO 15 = 9.40 fps Global:44.612 Y:0.9758523 RD FGO 100 = 9.40 fps Global:44.153 Y:0.9739887
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23rd April 2008, 17:34 | #31 | Link | |
x264 developer
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Posts: 8,666
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That's partially because I cheated; FGO lowers B-frame quantizers somewhat to ensure they stay grainy |
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23rd April 2008, 19:08 | #32 | Link | |
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Join Date: Dec 2005
Location: Austria, near Vienna
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i tested your new patch in combination with fft3dgpu > gradfun2db > x264. the results were excellent. the banding is almost reduced to nothing. your work is really amazing. this is a real great visual upgrade! |
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24th April 2008, 05:50 | #35 | Link | |
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Hello Dark,
I'm curious about the reasoning behind the formula for "noise score". Would you mind to elaborate? Quote:
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24th April 2008, 06:32 | #36 | Link | |
x264 developer
Join Date: Sep 2005
Posts: 8,666
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2. Because it doesn't matter exactly what noise we retain as long as its similar, two similar noise scores are a good thing. |
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24th April 2008, 13:29 | #38 | Link | |
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Thanks, - Dan |
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