Quantcast Avisynth: DCT Filter. Explanation Request. - digitalFAQ.com Forums [Archives]
  #1  
02-12-2004, 07:41 AM
Hydeus Hydeus is offline
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I have a request to all with wisdom ( ) to give me explanation of DCT usage (as simple as possible), or maybe link to page with this theme. As many of you knows I'm no expert in this, but I'm fast learnig.
I want to know what does (or may) this function improve in our work, especialy in MPEG4->MPEG1/2 transcoding, but also for DVD->Kxxx.

Thx 4 any explanation
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02-12-2004, 08:07 AM
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http://www.kvcd.net/forum/viewtopic.php?t=8551

And also look in the ffvfw Thread there I also explained the DCTFilterD() usage
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02-12-2004, 08:08 AM
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http://www.kvcd.net/forum/viewtopic.php?t=8551

And also look in the ffvfw Thread there I also explained the DCTFilterD() usage
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02-12-2004, 08:16 AM
Hydeus Hydeus is offline
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Thx Inc.
I try to put this in tests of ffvfw (I know it still buggy, but I want to try), through avs filter and/or ffdshow. I read ff post but I've overlook youre explanation This time I will read carefully
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02-14-2004, 06:41 PM
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One more question Inc.
I use thi function DCTFilter(1, 1, 1, 1, 1, 1, 0.5, 0), and with it I get strange noise around borders, like shock wave around bullet, or wave in front of ship, circle on water when after dropped stone (I don't know how beter to describe it, I gues that you know this issue). This is of cource in compare to without DCT filter.
Any sugestion how to eliminate this
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02-15-2004, 02:53 AM
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DCT FIlter appears like if you would take a bit of the horiz. resolution away. Means it cuts frequenzies, but I don't know the artifacts youre talking about
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02-15-2004, 04:29 AM
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I have no possibility to place pictures If you PM me youre email, I can send them to you. (I promisse I'll not smap you )

EDIT: I forgot to send you my script. There it is:
Quote:
AVISource("c:\1.avi")
LanczosResize(352, 288, 0, 0, 512, 384)
Undot()
MergeChroma(blur(0.25))
MergeLuma(blur(0.1))
Undot()
ConvertToYV12
Undot()
Convolution3D(1, 12, 22, 8, 8, 2.8, 0)
DCTFilter(1, 1, 1, 1, 1, 1, 0.5, 0)
Undot()
The intence of using so many undot filtering, is oryginal "get rid of mosquito noise" work, and I noticed that so many of it blures image in very gentle way.
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