Deinterlacing left artifact on the video - HELP!

[baz2121]

Hi,

I had to deinterlace an AVI I have (because the playback was jittery/shaky) and I used VirtualDub plug-ins I downloaded: Deinterlace - Smooth v1.1 and Deshaker v1.6. During the operation little dots and lines come up on the screen showing where the video is being deinterlaced (red) and where the video is being unretouched (white) etc bla bla bla.

Normally, on previous movies I've done this with, the video playback is generally fine after the deinterlacing is finished. But this time, even after it finished and I closed VirtualDub, the new AVI file played back with the dots and lines still on the video as if it were deinterlacing in VDub. I don't know what's happened, if anyone has a clue please help!

Thanx in advance ,
Baz

[teegee420]

Are you sure it's interlaced? 99% of downloaded avi's are progressive. It could be a codec problem causing the shaking.

[baz2121]

Not sure its a codec problem, coz i have a few other AVIs on the computer and none of them have that jittery/shaky playback. the video looks as if its playing each frame twice, i researched it a bit and found out that it was interlacing, and in fact most of the AVIs i get from this one place seem to all do the same thing. but the new file ive deinterlaced is playing back like it did when it was actually going through the interlacing process (with the lines and dots), i reset my comp and still didn't get rid of it. im stumped.....

[teegee420]

This is sounding more and more like a codec problem. Use G-spot and find out which codec the movie uses, and also which codec your system is using to decode. Post the info. Just so you know, interlacing doesn't necessarily look like shaking. What happens is that you get a combing effect during horizontal motion scenes.

[gastorgrab]

If you created a Progressive AVI from an Interlaced source, and its now shaking, maybe the field order got reversed.

[baz2121]

Im probably not expressing my problem properly sorry guys ive confused everyone LOL

The problem is no longer the shaking, it was shaking, thats the reason i had to deinterlace it. the problem now, is that the process of deinterlacing the AVI via VDub has left artifact on the end product. and the artifact is basically little white/red lines and dots all over the video.

these lines and dots are the exact same patterns that appear on the video stream while its being deinterlaced to show what part of the frame VDub is fixing. it seems that they have carried over onto the resultant video, which has been deinterlaced and is no longer shaky, but has the artifact still present on it as if it were still deinterlacing within VDub.

i know its confusing, but if u can actually download the plug-in i have (which i got from a link on this website from one of the help articles) and actually use it on a biot of video, ud be able to c the lines and dots iim talkin about

thanx again guys

[gastorgrab]

I think you'll have to back up a step.

This is just a guess, but....

When video is interlaced, one field is shifted slightly up, while the other field is shifted slightly down. If the fields were layed out to play sequentially, the video would appear to "BOB" up and down. Playing the wrong field first would; Start-Stop, Start-Stop (its actually reversing just a bit).

If the field order was reversed before you tried to deinterlace, then the position (slightly up, or slightly down) would be incorrect, and the deinterlace process would miss the bits that your trying to correct.

Do you still have the original VOB? Try to swap fields, and then deinterlace.

(again, just a guess)

[baz2121]

i've accidentally deleted the original AVI (i've alredy beat mmyself over it and told myself how stupid i am so dont worry bout that). but i am gonna download the same file, and try it again, ill keep u updated!

[bugster]

But what is your final requirement for this AVI. If you intend to convert to mpeg-2 (SVCD or DVD) and play it on a TV, leave it interlaced, encode to mpeg-2 as interlaced (make sure you get the correct field order setting when you encode) and it will look fine.

If you wish to watch it on a PC, use PowerDVD as this de-interlaces on the fly.

[baz2121]

Thanx for the info dude coz I didn't know that stuff - I'm kind of semi-experienced LOL!!!

But the problem now is I've already deinterlaced, which left artifact on the video, dats what I'm trying to get rid of. I guess I'm just gonna have to re-downlaoad the file and start again.

[teegee420]

That would probably be best. Just remember that you don't have to deinterlace if you plan to output as DVD. If you just want to watch the file on your PC then deinterlacing is a must. I would advice that you use Virtualdub's own deinterlace filter instead of the plug in. Just add it and click ok.

[VCDHunter]

That would probably be best. Just remember that you don't have to deinterlace if you plan to output as DVD. If you just want to watch the file on your PC then deinterlacing is a must. I would advice that you use Virtualdub's own deinterlace filter instead of the plug in. Just add it and click ok.

Don't deinterlace you'll massacre the quality - do some reading on Lordsmurfs site about this.

[teegee420]

I'm well aware of the quality loss that de-interlacing introduces, but if the avi is only going to be played on the PC there's no reason to keep it interlaced.

[VCDHunter]

I'm well aware of the quality loss that de-interlacing introduces, but if the avi is only going to be played on the PC there's no reason to keep it interlaced.

Apart from maintaining as much quality as possible ?

[lordsmurf]

I'm well aware of the quality loss that de-interlacing introduces, but if the avi is only going to be played on the PC there's no reason to keep it interlaced.

PowerDVD or WinDVD with bob/weave ... there ... no reason to deinterlace.

I have some de-interlace artifact removal templates on my offline PC for TMPGENC, but the side effect is softening of the image. If original material is available, do that. That encodes also take about 9x realtime (whereas unfiltered files would be ½x realtime). You can see some stills of how they worked here (bottom of the page): http://www.digitalfaq.com/restoration/video/videorestore.htm