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kilg0r3 · 10th February 2003, 20:17

I get strange artefacts, noise and blocks in very dark, black or near black areas of my encode, which are _not_ present in the source. How do I get rid of these?

Note: AFAIK, all approaches reduce compressability quite a bit. So be aware of that.

Answer 1:
This is a known issue discussed extensively in this thread. One partical solution is to use an avisynth script containing

1. MarcFD's Mpeg2Dec3
2. Tom Barry's Unfilter

The script should look something like this:
#----------------------------------------
LoadPlugin("C:\Avisynth\Mpeg2Dec3.dll")
LoadPlugin("C:\Avisynth\Unfilter.dll")

Mpeg2Source("C:\Movie\Source.d2v")

LumaFilter(-2)
Unfilter (3,3)
#----------------------------------------

Lumafilter is a function of Mpeg2Dec3. So that, no further plugin is needed. Values for Lumafilter may differ here, so -1 or -3 might also work well. For more Information see the readme of Mpeg2Dec3.

Regarding the values for Unfilter, the same applies. These are just the values I prefer. You will have to experiment to find out what suits your needs

Answer 2:
There is also a filter called Blockbuster by Sansgrip(?). It seems, however, that it is designed to get rid of blocks which were already in the source.
I 've never tried it but it is supposed to work well.

Please also read this thread for help:
http://forum.doom9.org/showthread.php?s=&threadid=45431

10th February 2003, 20:17	#6 \| Link
kilg0r3 ! - User - ! Join Date: Nov 2001 Posts: 1,081	I get strange artefacts, noise and blocks in very dark, black or near black areas of my encode, which are _not_ present in the source. How do I get rid of these? Note: AFAIK, all approaches reduce compressability quite a bit. So be aware of that. Answer 1: This is a known issue discussed extensively in this thread. One partical solution is to use an avisynth script containing 1. MarcFD's Mpeg2Dec3 2. Tom Barry's Unfilter The script should look something like this: #---------------------------------------- LoadPlugin("C:\Avisynth\Mpeg2Dec3.dll") LoadPlugin("C:\Avisynth\Unfilter.dll") Mpeg2Source("C:\Movie\Source.d2v") LumaFilter(-2) Unfilter (3,3) #---------------------------------------- *Lumafilter* is a function of Mpeg2Dec3. So that, no further plugin is needed. Values for Lumafilter may differ here, so -1 or -3 might also work well. For more Information see the readme of Mpeg2Dec3. Regarding the values for *Unfilter, the same applies. These are just the values I prefer. You will have to experiment to find out what suits your needs Answer 2:* There is also a filter called Blockbuster by Sansgrip(?). It seems, however, that it is designed to get rid of blocks which were already in the source. I 've never tried it but it is supposed to work well. Please also read this thread for help: http://forum.doom9.org/showthread.php?s=&threadid=45431 __________________ Keep your tone warm and your sigs decent! Last edited by kilg0r3; 12th May 2003 at 08:25.