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28th April 2008, 05:41 | #62 | Link |
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what's keeping this patch from being added to the svn at x264.nl? is there more work to be done with this patch, dark shikari? those rate distortion thresholds, or whatever?
Last edited by cestfait; 28th April 2008 at 05:45. |
28th April 2008, 14:16 | #64 | Link |
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Really good work ... this patch must be quickly in the svn ... ?
There are other good idea like rdo for bframe from libavcodec.
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Le Sagittaire ... ;-) 1- Ateme AVC or x264 2- VP7 or RV10 only for anime 3- XviD, DivX or WMV9 Last edited by Sagittaire; 28th April 2008 at 14:23. |
28th April 2008, 17:43 | #66 | Link |
x264 Tester
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sry for the delay, didn't have much time the last days...
here is an example for banding + blocking WITH AQ, which is resolved by FGO: AVS Code:
DGDecode_mpeg2source("Black.Pearl.Sample.d2v", idct=7, info=3).trim(2,0) crop(0,58,0,-62).LanczosResize(768,320) fft3dfilter().gradfun2db() Code:
--crf 20.0 --level 4.1 --keyint 100 --min-keyint 1 --ref 3 --mixed-refs --no-fast-pskip --bframes 2 --b-pyramid --b-rdo --bime --weightb --filter -2,-2 --subme 6 --trellis 1 --analyse p8x8,b8x8,i4x4,i8x8 --8x8dct --vbv-bufsize 9781 --vbv-maxrate 29400 --threads auto --thread-input --progress --no-dct-decimate --output "output" "input" --fgo 10 --aq-mode 2 |
28th April 2008, 20:30 | #67 | Link |
Derek Prestegard IRL
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I've noticed a pretty significant increase in bitrate when FGO is used in CRF mode. I did an episode of planet earth, and with the latest SVN at CRF20 it came out to ~ 1.8 GB video only. The FGO build came out at 2.2 GB roughly. The differences were very apparent in grainy scenes, and (of course) not very apparent in clean scenes. A ~20% increase in bitrate is pretty significant, but worth it IMO, especially for real film content. Planet earth is a real mix of footage - some film, some HD, some upconverted SD.
I'll do some tests with 2001 A Space Odyssey BluRay. I haven't watched it yet (picked it up last weekend hearing it's probably the best looking BluRay in terms of video quality), but I assume there will be some film grain. Also, there hasn't been a huge drop in speed. I averaged 5.7 FPS on my Q6600 with a minimal AVS script when using FGO - obviously including RDO, trellis etc... That's pretty standard, and entirely acceptable. ~MiSfit
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28th April 2008, 20:42 | #68 | Link |
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@Blue_MiSfit
Never visually compare 2 encodes at different bitrates. Your intuition is not able to judge whether a given change in quality is worth x% bitrate. (Unless of course you're deciding what bitrate to use. But that's not the case here) If you already knew this, then shame on you for posting meaningless reports pretending to support FGO. If you didn't, then now you know. If you're complaining that FGO changed your bitrate, then that's valid, but you shouldn't have gone on to post a visual comparison. @ToS_Maverick Same to you, except even more so because you didn't even say what relative size those encodes were. BTW, do you really think it's better? All I see in that screen is banding vs banding+noise. And more noise than the source, for that matter. Last edited by akupenguin; 28th April 2008 at 21:13. |
28th April 2008, 20:50 | #69 | Link |
Derek Prestegard IRL
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@ akupenguin
Now hold on a second... what's wrong with visually comparing encodes at different bitrates? I'm comparing encodes at the same CRF (since that's about the only mode I use these days), and trying to learn where FGO is appropriate, and roughly what the bitrate cost tends to be. In this specific case it probably wasn't worth it. I respect you and your opinions tremendously, but I'm a little put off by your tone! What exactly is wrong with comparing two encodes as I have done? Thanks, ~MiSfit
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28th April 2008, 20:51 | #70 | Link | |
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Quote:
It would still look better, wouldn't it? So you always have to compare at the same bitrate. |
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28th April 2008, 20:55 | #71 | Link |
Derek Prestegard IRL
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Fair enough, but I wouldn't expect that of you!
Still, I think I get the point. I've gotten very used to CRF encoding, and didn't really think about it as a test. Would comparisons between CRF encodes still be valid when (for example) looking at how denoisers perform? Thanks ~MiSfit
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28th April 2008, 21:16 | #72 | Link | |
x264 developer
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Don't make me implement --placebo
Quote:
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28th April 2008, 21:22 | #74 | Link |
Derek Prestegard IRL
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[edit] dark_shiraki beat me to it [/edit]
The best part is, if you implemented some feature that DRASTICALLY slowed encoding time or skyrocketed bitrate, I guarantee some wacko out there would swear by it (Divx exhaustive motion search / blatant SSE4 advertising anyone?) I think you're absolutely right regarding the denoiser tests.. Thanks for the information. My perspective has adjusted accordingly! ~MiSfit
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28th April 2008, 23:29 | #75 | Link | ||
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Quote:
Quote:
2. about the noise: i like noise, especially if it preserves the look and if it hides ugly blocks. this point is about taste, and thank god everyone has a different one |
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29th April 2008, 14:02 | #76 | Link |
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If you like the noise then why are you using an aggressive denoiser like FFT3DFilter? I'm not exactly sure what you are getting at here with FGO. Are you saying that your combination of filtering and FGO keeps just the right amount and type of noise to keep the blocking and banding in the source under control? Or are you saying that the banding you are trying to eliminate is caused by x264 without FGO? From what I can gather FGO is aimed at retaining the grain inherent in the source where in the past x264 has been itself more aggressive with noise than some desire.
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29th April 2008, 17:04 | #77 | Link |
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the point of this test was, that with this sorce, if denoised with
only AQ => blocks AQ + FGO => the dithering from gradfun2db is kept. in another thread someone did a test with a heavily denoised clip of "V for Vendetta", which needed < 1 mbit, but had severe banding. with gradfun2db you can "dither away" the banding, but if you encode the dithered clip, x264 blocks and bands again, without FGO. |
29th April 2008, 17:33 | #78 | Link | |
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Quote:
Andrew |
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30th April 2008, 09:40 | #80 | Link |
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I made a reencode from Underworld ExtendedCut HDDVD with --fgo 10 ,Deadzones 6,6 ,CQM none (flat),10Mbps VBR, AQ default (1,0)
Very nice Result with this very grainy Source. Quants are around 1-1,5 higher compared to no fgo bit it looks better imho I will make a reencode from 300 Bluray cause my old encode was with Prestige CQM ( i dont use Prestige CQM anymore since Month). I think FGO will work very very good on such Sources like 300 or BlackhawkDown etc Actually im running Elecard ConverterStudio ProHD with FilmGrainOptimizer at 80. I will compare the encode with x264 FGO Nice work DarkShikari Last edited by ACrowley; 30th April 2008 at 09:47. |
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