What should we do to reduce the artefact "Dot Crawl"?

[jamewoong]

Hi,

I've a video recorded from an analog source and would like to know is there a way to reduce or remove the artefact called "Dot Crawl" while compresing it with DVD Rebuilder?

It looks like this:
http://www.michaeldvd.com.au/Articles/VideoArtefacts/DotCrawlCloseUp.gif

Is there any filter that we can add to remove it?

Thanks.

[Boulder]

Try searching for "dot crawl" and you should get a bunch of answers.

[Guest]

Here's a good way to search, use Google (Doom9 search is notoriously, um, suboptimal) and enter:

"dot crawl" site:forum.doom9.org

http://www.google.com/search?sourceid=navclient&aq=t&ie=UTF-8&rls=GGLD,GGLD:2005-08,GGLD:en&q=%22dot+crawl%22+site%3aforum%2edoom9%2eorg

[jamewoong]

After a deep search, the recommended plug-in to remove the "Dot Crawl" is to use the Guava Comb filter. In the plug-in folder, it doesn't tell us how to use it with DVD Rebuilder...

After adding the plugin into the avisynth plug-in folder, what should I write into the AVS filter editor (in DVD Rebuilder) to make it work?

[~bT~]

^ did you read any docs that came with the plugin?

most probably u simply add:

guavacomb()

[jamewoong]

After adding the plug-in into the AVS plgun-in folder, I add this into the AVS Filter Editor:

LoadPlugin("c:\Program Files\AviSynth 2.5\plugins\GuavaComb.dll")
GuavaComb(Mode = "NTSC", Recall = 75, MaxVariation = 25, Activation = 40)

After the Prepare phase, I look at the segment viewer and see a black screen with red text:

GuavaComb: Ths filters only supports the YUY2 color format

What does it mean?

[~bT~]

U need to add:

ConvertToYUY2()
GuavaComb(Mode = "NTSC", Recall = 75, MaxVariation = 25, Activation = 40)
ConvertToYV12()

[jamewoong]

U need to add:

ConvertToYUY2()
GuavaComb(Mode = "NTSC", Recall = 75, MaxVariation = 25, Activation = 40)
ConvertToYV12()
In the AVS option, there's already a "check" in the ConvertToYUY2() and AudioDub(BlankClip())

It is necessary to add that?

[~bT~]

^yes mate.

the bit u mentioned above only happens at the end so yes u need to add that.

[jamewoong]

Tested it and there's nothing... The Dot Crawl is still present.

I even try to increase the Recall to 85, MaxVariation to 40, Activation to 50 and nothing appears...

Any solution?

[Insomniak4700]

Maybe try the DeDot filter.... try googling this site for it as suggested above

[Wilbert]

about guavacomb:

This comb filter only works temporally, not spatially. As a result, it only helps with dot crawl, rainbows, and shimmering in stationary portions of a video.
Is your dot-crawl from a stationary part of the video? If so, the removal should kick in after 10/20 frames or so.