Quantcast Avisynth: Mergechroma to Gain Compression? - digitalFAQ.com Forums [Archives]
  #1  
02-22-2003, 08:41 AM
Jellygoose Jellygoose is offline
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Has anyone heard of this line for your AVS Script:

mergechroma(blur(1.3))

It's supposed to gain a little compressibility without affecting picture quality... I tried to find out how it works, but hadn't had much success yet...
any experiences?
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  #2  
02-22-2003, 09:18 AM
Boulder Boulder is offline
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I tried it once, couldn't see any difference but filesize went down about one percent. Not much but everything's appreciated. I also use DCTFilter with settings (1,1,1,1,1,1,0.5,0) and gain some extra compression without losing any details.
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  #3  
02-22-2003, 10:24 AM
kwag kwag is offline
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I tried it too, but I used the max value for blur mergechroma( blur(1.58 )) .
File size did come down a little with no visual difference. I compared it in two frames with Vdub. Looks like we can crank up CQ just a tad with this
Thanks Jellygoose

-kwag
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  #4  
02-22-2003, 12:03 PM
kwag kwag is offline
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Would anyone care to try this

mergechroma(blur( 1.58 ))
mergeluma(blur( 1.58 ))

Sample size without the above and bilinear resize: 11,194KB
Sample size WITH the above lines AND lanczos resize: 10,099

Script here:

Code:
LoadPlugin("C:\encoding\mpeg2dec.dll")
LoadPlugin("C:\encoding\GripFit_preview.dll") 
LoadPlugin("C:\encoding\blockbuster.dll") 
LoadPlugin("C:\encoding\legalclip.dll") 
LoadPlugin("C:\encoding\sampler.dll") 
LoadPlugin("C:\encoding\dustv5.dll") 
LoadPlugin("C:\encoding\temporalcleanerold.dll")

Mpeg2Source("K:\S1M0NE_WS\VIDEO_TS\simone.d2v")
LegalClip() 

mergechroma(blur(1.58)) 
mergeluma(blur(1.58)) 

GripCrop( width=528, height=480, overscan=2 ) 
GripSize(resizer="lanczosresize") 
SpaceDust()
TemporalCleaner()
GripBorders() 
LegalClip() 
Sampler(length=24)
Now doing a sample without lanczos but with Blockbuster "Sharpen".
BTW: If you remove the lanczosresize from the gripsize line, it uses the default bilinear resize and the sample file size is ~9.5MB , but it looses some sharpness. Still, I can't tell a difference from the colors or brightness with the two lines mergechroma(blur( 1.58 )) and
mergeluma(blur( 1.58 )) added to the script, but the space saving is humongous

-kwag
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  #5  
02-22-2003, 12:08 PM
Boulder Boulder is offline
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Now where is that Canadian encode freak (SG) I sure hope he's okay, it's been a long time since he's been here.
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  #6  
02-22-2003, 12:11 PM
kwag kwag is offline
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Quote:
Originally Posted by Boulder
Now where is that Canadian encode freak (SG) I sure hope he's okay, it's been a long time since he's been here.
We're all asking the same question. I hope he's ok too

-kwag
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  #7  
02-22-2003, 12:15 PM
Jellygoose Jellygoose is offline
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hey kwag, that is fantastic!! A hell of a lot difference !

I tried it too, and it really does help compression!
Me personally I don't really like Lanczos Resizer. If I want extra sharpness I increase resolution to 704x576.
With this I achieve the same effect, and also blocks are becoming smaller!

kwag, with these new settings try to go for 704x480 in resolution for KVCDx3! I tried it, and I only had to drop CQ by 2 compared to the 544x480 resolution! I think it's a better way to get sharpness than applying sharpness filters or using lanczos...

BtW Boulder: what is DCT Filter doing?
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  #8  
02-22-2003, 01:21 PM
Boulder Boulder is offline
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I'm not exactly sure since I don't know much about maths

Here's a link to the official thread:

http://forum.doom9.org/showthread.php?s=&threadid=38539

The settings I use are generally recommended, they don't seem to wipe out any details and do increase compression a bit.
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  #9  
02-22-2003, 01:49 PM
kwag kwag is offline
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Quote:
Originally Posted by Jellygoose
kwag, with these new settings try to go for 704x480 in resolution for KVCDx3! I tried it, and I only had to drop CQ by 2 compared to the 544x480 resolution! I think it's a better way to get sharpness than applying sharpness filters or using lanczos...
Hi Jellygoose,

I tried a clip at 704x480 and 528x480 on my HDTV, and the difference is almost barely visible. I'll settle for 528x480, because now I can raise the CQ 2 to 3 clicks, and that makes a HUGE quality difference specially on static walls and motion object
I'm doing a full encode again of S1M0NE just to compare my previous encode

-kwag
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  #10  
02-22-2003, 02:07 PM
KingTuk KingTuk is offline
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here is the DCT filter for avisynth 2.07

http://www.jungleweb.net/~sansgrip/DctFilter_YUY2.zip

and the suggested settings

DctFilter(1,1,1,1,1,.5,.5,0)

***also you are supposed to use the filter on resolutions that are a multiple of 16
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  #11  
02-22-2003, 02:08 PM
rendalunit rendalunit is offline
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hi,

my results were the opposite
With one minute high motion scene from "the Bourne Identity" (car chase)

with bilinear
Code:
Mpeg2Source("D:\encoding\mergechroma\test.d2v")
LegalClip()

mergechroma(blur(1.58))
mergeluma(blur(1.58))

BilinearResize(512,344,3,0,714,480)
AddBorders(8,68,8,68)
LegalClip()
file size @cq-100 15.125mb

with lanczos
Code:
Mpeg2Source("D:\encoding\mergechroma\test.d2v")
LegalClip()

mergechroma(blur(1.58))
mergeluma(blur(1.58))

LanczosResize(512,344,3,0,714,480)
AddBorders(8,68,8,68)
LegalClip()
file size @cq-100 15.319mb

I'll try a sample with Sampler(length=24) next..
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  #12  
02-22-2003, 02:40 PM
mfb mfb is offline
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Hi All,

I did some test with MergeChroma/Luma(blur(1.5) and sharpening on
American Beauty predicted to a CDR-90:

[/code]
inital-script:

Mpeg2Source("D:\Beauty\beauty.d2v")
LegalClip()

MergeChroma(blur(1.5)
MergeLuma(blur(1.5)
BilinearResize(512,352,39,74,642,426)
SpaceDust()
TemporalCleaner()
Blockbuster(method="noise", detail_min=1, detail_max=10, variance=0.3, seed=1)

AddBorders(16,112,16,112)
LegalClip()
Code:


without MergeChroma/Luma(blur(1.58)):

    14.755 KB   American Beauty (544x576) x3 CQ72



with MergeChroma/Luma(blur(1.58)):	

   12.647 KB   American Beauty (544x576) x3 CQ72 -LanzcosResize		
   12.586 KB   American Beauty (544x576) x3 CQ72 -BlockBuster Sharpen (strength=7)
   12.294 KB   American Beauty (544x576) x3 CQ72 -BilinearResize


I think the versions with MergeChroma/Luma are to blurry even if i use
LanczosResize or BlockBuster-Sharpen the one without them is clearly better but there is a big benefit in filesize. Maybe strength of blur should
be decreased...

regards, ***mfb***
[/quote]
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  #13  
02-22-2003, 02:46 PM
kwag kwag is offline
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Looks to me like this is going to be another long thread
Yes mfb, the value of mergeluma(blur( 1.58 )) is probably too high. Next step is to play with that value

-kwag
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  #14  
02-22-2003, 06:11 PM
kwag kwag is offline
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Here's what I've been playing with:

Code:
mergechroma(blur(1.58)) 
mergeluma(blur(0.8))
I really didn't get any notable file size difference by using DCTFilter in conjunction with these two filters.

This is the script I'm currently using to test, and the results are really awsome:

Code:
LoadPlugin("C:\encoding\mpeg2dec.dll")
LoadPlugin("C:\encoding\GripFit_preview.dll") 
LoadPlugin("C:\encoding\blockbuster.dll") 
LoadPlugin("C:\encoding\legalclip.dll") 
LoadPlugin("C:\encoding\sampler.dll") 
LoadPlugin("C:\encoding\dustv5.dll") 
LoadPlugin("C:\encoding\temporalcleanerold.dll")

Mpeg2Source("K:\S1M0NE_WS\VIDEO_TS\simone.d2v")
LegalClip() 
mergechroma(blur( 1.58 )) 
mergeluma(blur( 0.8 )) 
GripCrop( width=528, height=480, overscan=2 ) 
GripSize() 
SpaceDust()
TemporalCleaner()
Blockbuster(method="sharpen", detail_min=1, detail_max=99, strength=15)
GripBorders() 
LegalClip() 
Sampler(length=24)
I lowered the value in mergeluma to 0.8 and now the sharpness is retained far more that with a value of 1.0+
My new sampler went down from 14,844KB to 13,085 with almost no visual difference. Now that's a lot in terms of quality/size for a two hour movie

Edit: A couple of test clips follow in the next few minutes...

-kwag
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  #15  
02-22-2003, 07:03 PM
kwag kwag is offline
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Here are the tests:

With filters mergechroma(blur( 1.58 )) and mergeluma(blur( 0.8 )) : http://www.kvcd.net/film-chromaluma.m1v file size 460KB
Without filters: http://www.kvcd.net/film-no-chromaluma.m1v file size 503KB

-kwag
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  #16  
02-22-2003, 10:28 PM
jorel jorel is offline
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Kwag,


i was waiting if someone post his opinion...........
i download see the your samples in power dvd,zoomplayer and wmp7.1
and can't see diferences!

you see any?


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  #17  
02-22-2003, 10:59 PM
kwag kwag is offline
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Quote:
Originally Posted by jorel
Kwag,


i was waiting if someone post his opinion...........
i download see the your samples in power dvd,zoomplayer and wmp7.1
and can't see diferences!

you see any?


Very little. But I tweaked this even further to increase sharpness by lowering the value on mergeluma and adding more spatial and temporal filters. This is called "Maniac filtering :



Code:
LoadPlugin("C:\encoding\mpeg2dec.dll")
LoadPlugin("C:\encoding\GripFit_preview.dll") 
LoadPlugin("C:\encoding\blockbuster.dll") 
LoadPlugin("C:\encoding\legalclip.dll") 
LoadPlugin("C:\encoding\sampler.dll") 
LoadPlugin("C:\encoding\dustv5.dll") 
LoadPlugin("C:\encoding\nomosmooth.dll")
LoadPlugin("C:\encoding\fluxsmooth.dll")
LoadPlugin("C:\encoding\convolution3d")
LoadPlugin("C:\encoding\dctfilter_YUY2")

Mpeg2Source("K:\S1M0NE_WS\VIDEO_TS\simone.d2v")
LegalClip() 
mergechroma(blur(1.58)) 
mergeluma(blur(0.6)) 
GripCrop( width=528, height=480, overscan=2 ) 
GripSize() 
SpaceDust()
FluxSmooth(7,7)
NoMoSmooth(40,1,6,1,3,false)
Convolution3d(preset="movieHQ")
Blockbuster(method="sharpen", detail_min=1, detail_max=99, strength=15)
GripBorders() 
LegalClip() 
Sampler(length=24)
This is my latest test script using CQ=70, and look now how this KVCDx3 would look ( complete movie 131 minutes, 14 seconds on one CD ) : http://www.kvcd.net/s1m0ne-test.mpg ( 10 second clip )

-kwag
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  #18  
02-22-2003, 11:24 PM
rendalunit rendalunit is offline
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I found the first sample of S1MONE w/mergechroma and luna a wee bit too blurry- maybe slightly lower settings can help me- but that's damn good compression!!

btw- you might find this script helpful for comparing m1v clips:

Code:
# Compare .m1v clips

LoadPlugin("C:\encoding\MPEGDecoder.dll")      # http://nic.dnsalias.com/
LoadPlugin("C:\encoding\RemoveBorders.dll")     # http://www.jungleweb.net/~sansgrip/avisynth/

Title_Clip_a = "no chroma luma"
Title_Clip_b = "chroma luma"

a=MPEGsource("C:\film-no-chromaluma.m1v"). RemoveBorders(). subtitle(Title_Clip_a)
b=MPEGsource("C:\film-chromaluma.m1v"). RemoveBorders(). subtitle(Title_Clip_b)

StackVertical(a,b)
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  #19  
02-22-2003, 11:26 PM
jorel jorel is offline
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@ Kwag and "friendalunit"

really good....and thanks for scripts!

ps:

now i'm mad.
my last beer broke the ring..... searching for a to open this!
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  #20  
02-22-2003, 11:33 PM
kwag kwag is offline
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Quote:
Originally Posted by rendalunit
btw- you might find this script helpful for comparing m1v clips:

Code:
# Compare .m1v clips

LoadPlugin("C:\encoding\MPEGDecoder.dll")      # http://nic.dnsalias.com/
LoadPlugin("C:\encoding\RemoveBorders.dll")     # http://www.jungleweb.net/~sansgrip/avisynth/

Title_Clip_a = "no chroma luma"
Title_Clip_b = "chroma luma"

a=MPEGsource("C:\film-no-chromaluma.m1v"). RemoveBorders(). subtitle(Title_Clip_a)
b=MPEGsource("C:\film-chromaluma.m1v"). RemoveBorders(). subtitle(Title_Clip_b)

StackVertical(a,b)
Thanks ren,
Now that's one more for my toolbox .
Here's the one I've been using:

Code:
clip1 = directshowsource("k:\film1.m1v") 
clip1 = clip1.Subtitle("Clip-1") 

clip2 = directshowsource("k:\film2.m1v") 
clip2 = clip2.Subtitle("Clip-2") 

StackVertical(clip1, clip2) 
#Levels(0, 1.5, 255, 16, 255) 
ConvertToRGB()
-kwag
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