How to deinterlace the preview ?

Lucius_Snow wrote on 8/30/2003, 7:12 PM
Hi all,

Sorry if this question was asked before. I did a search and found some things related to my problem. However i couldn't solve it.

Actually, i've got some flaws at the preview due to my video which is interlaced. I know it won't be on my final ouput on TV but i'd like to find a way to deinterlace just the preview (not the film) so i get a decent image when i make some edition on my PC.

I use the default PAL DV projet settings. I tried the 3 choices at "Deinterlace method" but the problem is still there.

I've got Vegas 4.0 and my capture is from a DV PAL camrecorder. By the way, when i open my AVI file with Media player 6.4, there's no flaws. Any idea ?

Thanks a lot.

Comments

GaryKleiner wrote on 8/30/2003, 9:51 PM
Are you talking about preview on your computer monitor or external video monitor? The computer monitor is non-interlaced, the video is interlaced. There's no simple way around that.

What flaws are you referring to?

Gary
Lucius_Snow wrote on 8/31/2003, 6:12 AM
Computer monitor. Here is the kind of flaws :
http://poubellelqt.free.fr/crap/defaut.jpg

I know my video is interlaced. But how come is my display fine on Media Player and not the preview of Vegas ? Then i guess there's maybe a way to sort it out because the de-interlacing seems possible when viewing the same video through another application.

Any idea ?
Thank you.
johnmeyer wrote on 8/31/2003, 3:15 PM
You will find that you will get interlace artifacts in the preview screen on the computer if you set preview quality to Draft. You also get some in the Preview quality. Click on the quality button above the preview window and change it to Best and see if you like the results. The quality settings trade off picture quality for preview speed. On a fast computer, raw video should display at full frame rate at Best, but almost any effect or transition will only display at a few frames per second. Stick with Preview or Draft to get a sense of timing and motion; use Good or Best (or pre-render) to fully appreciate the results of any transition or effect.
Lucius_Snow wrote on 8/31/2003, 4:36 PM
Well, i still have the artifacts due to the interlacing whatever the settings are. What i've needed is a way to deinterlace the video in real time when i play it, like Windows media player does for example.

I think i'm gonna drop this preview thing in Vegas cause my issue seems unresolvable. I keep wondering how people can make some edition with such artifacts. That's unwatchable on a PC to me (like i showed it in the URL i have you).

What i'll do, if this is possible (i hope so), is to transfer the preview to the DV input of my videocamera and so plug it to a TV through S-video or Composite. Anyone have already tried this ?

Thanks.
RBartlett wrote on 9/1/2003, 2:21 AM
By default (it is deep in the preferences of Windows Media Player) the footage only plays a single field on the DV codec. Even if you scale the window to 720x480, you don't get the full frame size. I think it dates back to when PCs just didn't have the ability to do the A/V parts of DV properly. This dates back to before 350MHz CPUs without a dedicated DV hardware accelerator.

Getting the right look on the window can be helped by reducing the picture size on the preview monitor in Vegas to squash the 2nd field also.

There might be some fluid and possibly realtime de-interlacing possible using the Dscaler filter and the virtualdub conduit/plug-in in Vegas4 (3rd party plug-in).
Lucius_Snow wrote on 9/1/2003, 6:29 AM
I'll have a try to these plugins.

Thank you all for your help.
Cheers.