Deinterlacing Fast Motion Footage at DVinfo.net

Go Back   DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

What Happens in Vegas...
...stays in Vegas! This PC-based editing app is a safe bet with these tips.


Reply
 
Thread Tools Search this Thread
Old September 29th, 2007, 08:04 AM   #1
Guest
 
Posts: n/a
Deinterlacing Fast Motion Footage

I've got some footage that I've sped up. That track has a Mike Crash deinterlacer on it - however when I output the sped up footage, it appears interlaced. Is there a way around this?

I'm guessing it needs to deinterlace AFTER being sped up but how do I do this, since the velocity isn't an FX that I can put in a certain order...
  Reply With Quote
Old September 29th, 2007, 09:15 AM   #2
Regular Crew
 
Join Date: Mar 2006
Location: New York, NY
Posts: 138
No, it's the opposite. You need to deinterlace the footage first at its regular speed, then apply a velocity change to the now-progressive footage.

This is because the process of speeding up will drop frames, and those missing frames contain information that the deinterlacer needs.

Fortunately, it is very easy to set this up in Vegas:

1) Load your media
2) Apply the MC Smart Deinterlacer
3) At the bottom of the Video Event FX dialog, look for the little timeline
4) There should be the text "Smart Deinterlacer" with a little triangle just to the left of it
5) Click on the triangle - it should flip over to point the other way (sharp end towards the left)
6) Apply your velocity changes, other effects, etc.

The little triangle is called the pre/post toggle, and is used to set whether effects are applied before or after the rest of the rendering process.

Any effects that should be applied to raw frames should be "pre", before Vegas does any kind of frame rate change or interpolation. Deinterlacing and noise reduction are in this category.
Gian Pablo Villamil is offline   Reply With Quote
Old September 29th, 2007, 10:07 AM   #3
Guest
 
Posts: n/a
ahh right, so for example, for reducing combing when zooming in on footage, you would deinterlace PRE, (pointing to the left), so that it's a progressive frame, then it zooms in on that... rather than zooming in on it, creating the combing FIRST then attempting to deinterlace it

correct?

thanks
  Reply With Quote
Old September 29th, 2007, 12:35 PM   #4
Regular Crew
 
Join Date: Mar 2006
Location: New York, NY
Posts: 138
Exactly.

It's practically impossible to remove combing once you've scaled the video - deinterlace filters are looking for alternating single pixel lines.

Quote:
Originally Posted by Jonny Brady View Post
ahh right, so for example, for reducing combing when zooming in on footage, you would deinterlace PRE, (pointing to the left), so that it's a progressive frame, then it zooms in on that... rather than zooming in on it, creating the combing FIRST then attempting to deinterlace it

correct?

thanks
Gian Pablo Villamil is offline   Reply With Quote
Old September 29th, 2007, 12:39 PM   #5
Guest
 
Posts: n/a
hmm, well perhaps you can help me with this? 'cause that's not working for me...

http://www.dvinfo.net/conf/showthrea...=104451&page=2
  Reply With Quote
Old September 29th, 2007, 12:53 PM   #6
Regular Crew
 
Join Date: Mar 2006
Location: New York, NY
Posts: 138
Just posted in that thread too.

Make sure you're using either the Mike Crash filter OR Vegas built-in deinterlacing, not both.
Gian Pablo Villamil is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 01:11 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network