Dots! Oh god, dots!!

This forum is for questions and discussion of all the aspects of handling your footage. If you have questions about capturing/ripping footage, AviSynth, or compression/encoding/converting, look here.

Dots! Oh god, dots!!

Postby Garylisk » Thu Dec 28, 2006 1:57 am

It's not a problem with an AMV, but a video problem in general. I trust the AMV community to be quality whores and know how to handle crazy things like this, so I present you with...

EXHIBIT A
Image

Circled below are the problem areas!
Image

Notice the horrid dots! They move in the video, too. They seem to happen when lines are near one another, and Washu has the problem the most out of any aspect of the file.

The images you see above are taken without any filtration - that is the quality of the original video file. (A raw episode 1 of "Sasami - Mahou Shoujo Club")

Do you think it is even possible to somehow right this horrible wrong?
Get a life? I'm a gamer! I have lots of lives!
User avatar
Garylisk
 
Joined: 17 Aug 2001
Location: Equestira
Status: Littlecolt

Postby Kariudo » Thu Dec 28, 2006 2:16 am

yes it is.
this is a well-established problem known as dot crawl.
there are a few filters that can take care of this in AviSynth.

<a href="http://avisynth2.cvs.sourceforge.net/*checkout*/avisynth2/docs/serbian/externalfilters/tcomb.htm">Tcomb</a> (can be used for de-rainbowing and dot-crawl removal...part of Tritical's TVITC package)
<a href="http://avisynth2.cvs.sourceforge.net/*checkout*/avisynth2/docs/serbian/externalfilters/undot.htm">undot</a>
dedot
(IIRC all of these filters need to be used before de-interlacting/ivtc-ing)

I have pictures of results I got from the R1 release of FMP Fumoffu using Tcomb in this thread
ImageImage
Image
User avatar
Kariudo
Twilight prince
 
Joined: 15 Jul 2005
Location: Los taquitos unidos
Status: 1924 bots banned and counting!

Postby Garylisk » Thu Dec 28, 2006 2:23 am

Apparently the dots only occur when there is motion.
Observe exhibits B through F

Absence of dots
Image

Dots appear
Image

Dots still apparent
Image

Dots less apparent
Image

Dots dissapear
Image
Get a life? I'm a gamer! I have lots of lives!
User avatar
Garylisk
 
Joined: 17 Aug 2001
Location: Equestira
Status: Littlecolt

Postby Garylisk » Thu Dec 28, 2006 2:24 am

Kariudo wrote:yes it is.
this is a well-established problem known as dot crawl.
there are a few filters that can take care of this in AviSynth.

<a href="http://avisynth2.cvs.sourceforge.net/*checkout*/avisynth2/docs/serbian/externalfilters/tcomb.htm">Tcomb</a> (can be used for de-rainbowing and dot-crawl removal...part of Tritical's TVITC package)
<a href="http://avisynth2.cvs.sourceforge.net/*checkout*/avisynth2/docs/serbian/externalfilters/undot.htm">undot</a>
dedot
(IIRC all of these filters need to be used before de-interlacting/ivtc-ing)

I have pictures of results I got from the R1 release of FMP Fumoffu using Tcomb in this thread


The source is progressive.
Get a life? I'm a gamer! I have lots of lives!
User avatar
Garylisk
 
Joined: 17 Aug 2001
Location: Equestira
Status: Littlecolt

Postby Kariudo » Thu Dec 28, 2006 2:38 am

bummer...don't know of anything that can help in that situation.
maybe you can somehow interlace your footage, then do the dot crawl removal then de-interlace?

there might be something out there for vdub...maybe
ImageImage
Image
User avatar
Kariudo
Twilight prince
 
Joined: 15 Jul 2005
Location: Los taquitos unidos
Status: 1924 bots banned and counting!

Postby Garylisk » Thu Dec 28, 2006 2:47 am

Kariudo wrote:bummer...don't know of anything that can help in that situation.
maybe you can somehow interlace your footage, then do the dot crawl removal then de-interlace?

there might be something out there for vdub...maybe


It's doubtful, but I've kept trying things for a while... I don't see a solution since the footage is progressive.
Get a life? I'm a gamer! I have lots of lives!
User avatar
Garylisk
 
Joined: 17 Aug 2001
Location: Equestira
Status: Littlecolt

Postby Willen » Thu Dec 28, 2006 6:43 am

Maybe Guava Comb? But if it's in the source and it's already progressive, that's gonna be tough. Someone messed up the broadcast or capture.
Having trouble playing back videos? I recommend: Image
User avatar
Willen
Now in Hi-Def!
 
Joined: 10 Jul 2005
Location: SOS-Dan HQ
Status: Melancholy

Postby Scintilla » Thu Dec 28, 2006 7:32 am

Shouldn't DeDot, etc. still work on progressive source? They always say to use before deinterlacing or IVTC in case the dot crawl was introduced after the telecine process, but if the source is progressive to begin with, then you don't have to worry about that.

If it helps, I have an English readme file (I did not translate it, somebody else did) for DeDot available here:
http://www.aquilinestudios.org/scripts/
ImageImage
:pizza: :pizza: Image :pizza: :pizza:
User avatar
Scintilla
(for EXTREME)
 
Joined: 31 Mar 2003
Location: New Jersey
Status: Quo

Postby Zarxrax » Thu Dec 28, 2006 12:04 pm

If it only occurs during motion, maybe the source has already been filtered? AFAIK, these dot crawl filters all work on a temporal-basis, so they cant handle motion areas.
User avatar
Zarxrax
 
Joined: 01 Apr 2001
Location: Concord, NC

Postby Garylisk » Thu Dec 28, 2006 2:13 pm

Zarxrax wrote:If it only occurs during motion, maybe the source has already been filtered? AFAIK, these dot crawl filters all work on a temporal-basis, so they cant handle motion areas.


Yep, I had to go out and find a different capture.
Get a life? I'm a gamer! I have lots of lives!
User avatar
Garylisk
 
Joined: 17 Aug 2001
Location: Equestira
Status: Littlecolt

Postby batmanMG » Sat Feb 24, 2007 4:17 am

Kariudo wrote:yes it is.
this is a well-established problem known as dot crawl.
there are a few filters that can take care of this in AviSynth.

<a href="http://avisynth2.cvs.sourceforge.net/*checkout*/avisynth2/docs/serbian/externalfilters/tcomb.htm">Tcomb</a> (can be used for de-rainbowing and dot-crawl removal...part of Tritical's TVITC package)
<a href="http://avisynth2.cvs.sourceforge.net/*checkout*/avisynth2/docs/serbian/externalfilters/undot.htm">undot</a>
dedot
(IIRC all of these filters need to be used before de-interlacting/ivtc-ing)

I have pictures of results I got from the R1 release of FMP Fumoffu using Tcomb in this thread


WHAT!!!!!!!!!!!!!!!!!!!?!?!?!?!?!?!?!?!!!!!!!!!??????!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :shock: ::crawls into fetal position to cry:: I HATE BEING AN AVISYNTH NOOOB!!!!!!! oh well its too late to fix it now (too many frame exports used) soooooo anyone know of something that works on progressive? 0: )
User avatar
batmanMG
 
Joined: 28 Jan 2005


Return to Footage Help

Who is online

Users browsing this forum: No registered users and 1 guest

cron