Interlace problem on fast movement in HDV at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.


Reply
 
Thread Tools Search this Thread
Old December 15th, 2007, 08:59 PM   #1
Regular Crew
 
Join Date: Feb 2006
Location: Philadelphia, PA
Posts: 55
Interlace problem on fast movement in HDV

I have a Sony A1U and I am using Vegas to capture. I find on fast movement there is a severe interlacing problem. I've added a link below to a picture of the problem. I capture as HDV and I thought since the field order is None (progressive scan) this shouldn't be a problem. This is probably something I should know how to fix, but since I don't I thought I would ask the experts. Anything anyone needs to know to help determine the problem just let me know.

http://thecritics.tv/Samples/InterlaceProblem.jpg
Joel L. Young is offline   Reply With Quote
Old December 15th, 2007, 11:39 PM   #2
Major Player
 
Join Date: May 2004
Location: Louisville, KY
Posts: 378
I know in premiere you have to select de-interlace to make the footage look like it's really progressive. Selecting progressive still looks like interlaced when exporting. This is for premiere pro 1....I haven't messed with vegas so it could be different for that.
Eric Stemen is offline   Reply With Quote
Old December 16th, 2007, 12:55 AM   #3
Major Player
 
Join Date: Jun 2006
Location: chattanooga, tn
Posts: 721
If you shot interlaced, then it'll look interlaced no matter how you capture it... unless you deinterlace it in post, which unless I'm reading you incorrectly, you're not doing.

Are you seeing these same artifacts on an interlaced HDTV, or just on your progressive computer monitor? Interlaced footage played on a progressive monitor will always look like this, but it will look fine on an interlaced monitor. You actually have no problem if that's an accurate assessment of the situation.

If you do see these jaggies on an interlaced display, then that's different. Either your field order has gotten reversed, or your footage is all shifted over on the timeline by 1/60 of a second, or something like that.

So which is it?
__________________
-->jarrod whaley.
www.oakstreetfilms.com
Jarrod Whaley is offline   Reply With Quote
Old December 16th, 2007, 12:26 PM   #4
Regular Crew
 
Join Date: Feb 2006
Location: Philadelphia, PA
Posts: 55
ok, let me see if I can provide you with the needed information...

I am shooting in 1080i, but I've never set interlaced or deinterlaced or any field options on the camera. I'm actually capturing in vegas to a 720 template, so I tried in the 1080 template, but still had the same problem, just thinner lines. I have not viewed this on an HDTV. I always post my stuff online. I use a HD divx when I post to stage6. You can see this problem in the HD divx, so I traced to back to the earliest detection possible and noticed there was a problem while capturing. Can't notice on the small viewfinder of the camera. I tried reversing the field order and did not notice a difference.

I'm posting a link to one of the videos, you can first notice around 20 seconds when he moves his hands. (you will need the divx player to view this)
http://www.stage6.com/The-Critics/vi...Critics-tv-(HD)
Joel L. Young is offline   Reply With Quote
Old December 17th, 2007, 09:54 AM   #5
Inner Circle
 
Join Date: Aug 2005
Location: Atlanta/USA
Posts: 2,507
Joel, when processing interlaced footage to be viewed on a computer monitor YOU NEED TO DEINTERLACE! There is no ifs and buts, if you don't deinterlace, you will get the artifacts shown on your video. Some encoding software will do that automatically when encoding to a format destined for the internet, but others won't, you have to set it manually or do it before you encode.

One of the best pieces of software I found for deinterlacing (I use it for resizing as well) is the free VirtualDub (or VDub MPEG2 when working with HDV).
__________________
Ervin Farkas, CDVS
Certified Legal Videographer
Ervin Farkas is offline   Reply With Quote
Old December 22nd, 2007, 11:00 AM   #6
Regular Crew
 
Join Date: Feb 2006
Location: Philadelphia, PA
Posts: 55
Thank you to everyone for your help. I've been away but will try as soon as I get back. Ervin, I will try that software out. Other parts of the video that are moving come out fine, so I am guessing if I use that software on my footage I should be fine. Again thanks everyone, I'll update with what I get.
Joel L. Young 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 > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 10:18 AM.


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