x264: Film Grain Optimization

[Dark Shikari]

Originally Posted by Sagittaire

Well, first this patch work incredibily well. The ability to keep grain at low/medium bitrate is really good now. Even better than Mainconcept/Elecard implementation.

Know why? Mainconcept's "film grain optimization" is nothing but a bias in favor of inter blocks. Just a simple, one-line, non-adaptive numerical bias

Originally Posted by Sagittaire

Grain/noise is really hard to see on low luma level. Why not choose luma level for weight:

-> Low luma value imply classic RDO way with low grain/noise retention.

-> High luma value imply PSY RDO with high grain/noise retention.

This would completely eliminate the ability of psy RDO to keep fine detail on dark gradients and other places where x264 normally blurs out detail; IMO this is one of the places where it does best.

[Sagittaire]

Originally Posted by Dark Shikari

This would completely eliminate the ability of psy RDO to keep fine detail on dark gradients and other places where x264 normally blurs out detail; IMO this is one of the places where it does best.

Grain/noise are high temporal complexity. Detail on dark area generaly not. The best HVS way for dark area is:

1) Eliminate noise/grain on dark area because it's hard to see fine gradiant here.

2) Eyes are really sensitive to global in dark area (banding and blocking artefact). Use lower quantisation (AQ) without grain/noise (after filtering ... or other way) is a really better HVS way at equivalent size.

VC1 from MS work like that for very high quality encoding. VC1 PEP use Dark Noise Filtering for eliminate grain in dark area and after use AQ with luma masking for better quality in dark area.

[dimzon]

fgo rocks!

C:\12>"C:\Program Files\megui\tools\x264\x264.exe" --pass 2 --fgo 10 --bitrate 1
791 --aq-strength 1.2 --stats "C:\12\ss12.stats" --ref 10 --mixed-refs --no-fast
-pskip --bframes 16 --b-pyramid --b-rdo --bime --weightb --direct auto --filter
-2,-1 --subme 7 --trellis 2 --partitions all  --8x8dct --me umh --merange 24 --t
hreads auto --thread-input --sar 1:1 --progress --no-dct-decimate --output "C:\1
2\video12.mp4" "C:\12\12_video.avs"
avis [info]: 720x576 @ 25.00 fps (432825 frames)
x264 [info]: using SAR=1/1
x264 [info]: using cpu capabilities: MMX MMX2 SSE SSE2 SSE3 3DNow
mp4 [info]: initial delay 2 (scale 25)
x264 [info]: slice I:2350  Avg QP:19.59  size: 34844  PSNR Mean Y:44.94 U:48.55
V:48.69 Avg:45.79 Global:45.23
x264 [info]: slice P:180307 Avg QP:21.74  size: 13950  PSNR Mean Y:42.54 U:46.94
 V:47.05 Avg:43.55 Global:43.19
x264 [info]: slice B:250168 Avg QP:22.00  size:  5112  PSNR Mean Y:42.44 U:47.06
 V:47.14 Avg:43.44 Global:42.89
x264 [info]: mb I  I16..4: 10.9% 73.7% 15.4%
x264 [info]: mb P  I16..4:  2.3%  7.9%  0.7%  P16..4: 44.1% 20.6% 16.6%  0.3%  0
.1%    skip: 7.4%
x264 [info]: mb B  I16..4:  0.1%  1.4%  0.1%  B16..8: 47.8%  1.5%  3.5%  direct:
 6.5%  skip:39.1%
x264 [info]: 8x8 transform  intra:75.0%  inter:63.9%
x264 [info]: direct mvs  spatial:98.2%  temporal:1.8%
x264 [info]: ref P  60.0% 13.8%  8.0%  4.1%  3.4%  3.2%  2.7%  1.6%  1.5%  1.6%
x264 [info]: ref B  76.2% 11.3%  4.1%  2.2%  1.7%  1.5%  1.3%  0.9%  0.7%
x264 [info]: SSIM Mean Y:0.9843682
x264 [info]: PSNR Mean Y:42.494 U:47.019 V:47.114 Avg:43.500 Global:43.022 kb/s:
1791.03
 
encoded 432825 frames, 4.17 fps, 1791.08 kb/s

http://rapidshare.com/files/12178490...2-007.mkv.html

[Razorholt]

Try psyRDO with trellis 2, it's even better

[e-Pawel]

When will the FGO be adapted into the "official" release?

[Dark Shikari]

Originally Posted by e-Pawel

When will the FGO be adapted into the "official" release?

If something is adopted, it will probably be psy-RDO, since its more general-purpose, but I may end up combining the concepts of the two; I'll have to do more investigation.

[foxyshadis]

Off topic discussion moved to Reverse Engineering Discussion. Keep it there.

[TheCreamCrackerBoy]

Is the psyRDO/FGO development interrupted somehow? I was hoping to see some news lately.

[Shinigami-Sama]

Originally Posted by TheCreamCrackerBoy

Is the psyRDO/FGO development interrupted somehow? I was hoping to see some news lately.

FGO is being replaced or merged with psyRO
and theres still some work on it, mostly in dark's head/testbuild at the moment it seems

[TheCreamCrackerBoy]

What are those "diff" files (x264_fgo.2.diff, x264_FGO_techouse_fix.diff)?

Should I download them to use in my MeGui? If affirmative, which one(s) should I get?

Thank you,

TheCreamCrackerBoy.

[LoRd_MuldeR]

The "diff" files are patches. You apply them to the source codes before you compile your x264.exe and then you can use that EXE with MeGUI

BTW: FGO seems to be obsolete, now that Psy RDO has become popular...

[Sharktooth]

Psy-RDO is more general use.
FGO is still unbeaten on heavy grain however Psy-RDO is constantly improving and i hope it gets as near as possible or even better than FGO.

[TheCreamCrackerBoy]

Can I try (psy)RDO with this MeGui (latest version 0.3.0.1020, downlodaded at http://www.videohelp.com/tools/MeGUI") our should I use a different build?

Note: I´ve found another forum concerning PsyRDO at http://forum.handbrake.fr/viewtopic.php?f=4&p=37755. Is that another research for PsyRDO?

My best regards,

TheCreamCrackerBoy.

[LoRd_MuldeR]

I think the latest x264 build that comes with MeGUI per auto-update already has PsyRDO ...

[Sharktooth]

yes. it already has psy-rdo 0.5 and it is enabled by default.

[TheCreamCrackerBoy]

Originally Posted by Sharktooth

yes. it already has psy-rdo 0.5 and it is enabled by default.

Shouldn´t I use psy-RDO 10?

[LoRd_MuldeR]

Originally Posted by TheCreamCrackerBoy

Shouldn´t I use psy-RDO 10?

There no no Psy RDO "10"

The latest version of the Psy RDO patch available now is v0.5 and the default value for "--psy-rd" is 1.0000 ...

[TheCreamCrackerBoy]

Originally Posted by LoRd_MuldeR

There no no Psy RDO "10"

On the first page of this forum, I saw references to the setting "FGO 10"... is psy-RDO different then?

[LoRd_MuldeR]

Originally Posted by TheCreamCrackerBoy

On the first page of this forum, I saw references to the setting "FGO 10"... is psy-RDO different then?

"Psy RDO" and "FGO" are two a completely different patches! Also Psy RDO is a more general approach and it will most likely replace FGO...

[Soichiro]

PsyRDO defaults to on at a setting of 1.0, and it shouldn't be changed unless you have a good reason to. The 0.5 refers to the version number.

It might be interesting to see what would happen if you set Psy-RDO to strength 10 though.