Combining Upper & lower field

JohnDale · Post by **JohnDale** » Fri Oct 03, 2008 9:32 am

Hi
I have some video from a DVD camcorder, mpeg2 upper field first and from a DV camcorder avi lower field first. Thest two movies are of a friends 50th bithday. How do I combine these clips onto one DVD after editing. As I understand the process the field order of the original clip must be maintained throughout the editing/authoring process.

Post by **Ron P.** » Fri Oct 03, 2008 10:05 am

Simply put, you can not. You will have to decide on which of the field orders works best and use that. I would first create a new video file for the one that you change the field order.

You could try changing one of them to Frame based, as this is the same as having no-fields, and may not produce the jumpy video that is common with reversing the field order.

JohnDale · Post by **JohnDale** » Sun Oct 05, 2008 9:57 am

I tried converting to field based, but this resulted in the jerky effect. Does DV (from a tape camcorder) have a field order. For some reason I assumed it does, but when I load the clip into Videostudio and check the properties there is no field order. If this is the case then when I encode the DV to mpeg2 I can set the field order to either upper or lower and as long as this field order matches the field order of the clips from other cameras then I should have no problems. I have tested this and it seems to work ok, or was I just lucky it did this time.

Trevor Andrew · Post by **Trevor Andrew** » Sun Oct 05, 2008 12:04 pm

Hi

Go to File preferences, tick ¡¥show messages when inserting first video¡K¡K.

Start a new project and insert the avi,
Select details from the info window
View the right panel¡¦ video properties

Start a new project and repeat with the other video file.

Also

If you wish to change the avi to Frame Base
Use Tools--Make Movie Manager to create a template.

First use the ¡¥Add¡¦ function to copy the Avi video properties,
Edit this new template changing the frame type to Frame Based

Use this template to render the avi.

Post by **Ron P.** » Sun Oct 05, 2008 12:08 pm

DV does have a field order, which is always lower field first.

JohnDale · Post by **JohnDale** » Sun Oct 05, 2008 12:26 pm

Hi Vidoman
I assume this means that I should never mix/use clips with different field orders unless absolutely necessary.
Asside from the problem I have at the moment. I am considering buying a new video camera but all of my family videos for the past 5 years where recorded on a DV camera. So to ensure future campatability I should buy another DV camera or ensure that if I buy a hard disk drive camera that it records lower field first. Is this correct?

Post by **Ron P.** » Sun Oct 05, 2008 12:43 pm

You're correct that you should never mix field orders. Mixing them will result in one of the clips having jerky motion, and quality problems. If most of your clips are DV, then convert the clips that use a different field order to frame based.

With NLEs (non-linear editors) like VS, there can only be 1 field order. VS will use the field order set in your Project Settings, or the first video clip inserted. So if you have a DV (LFF) clip followed by an analog clip that uses UFF, the second one will show the affects of having the field order reversed.

As far as I know, most, if not all HDD (hard drive) camcorders record using UFF. Now throw in the current Hi-Def camcorders that use the highly compressed ADVHC codec. Those also use UFF, and need a very powerful (quad-core) PC to edit.

My suggestion is if possible don't mix the DV with other than Frame Based (also called No-Fields).

bankroot · Post by **bankroot** » Sun Oct 05, 2008 1:00 pm

vidoman wrote: Those also use UFF, and need a very powerful (quad-core) PC to edit.

I am not an expert, but are you sure ???
Core2Duo 3 GHz is not enough ?

Post by **Ron P.** » Sun Oct 05, 2008 1:21 pm

You're machine can handle it, however maybe rather sloooowww. You can use Proxy files, but they take forever to create. Once you're ready to create your video file from your project, it again takes a long time...

bankroot · Post by **bankroot** » Sun Oct 05, 2008 1:30 pm

sO, do yuo think, that if I change my processor to Quad I will solve my big problem with jerky anf frozen video ?
Why I can play my AVCHD clips very smoothly in another application (Pixela) ?

Post by **Ken Berry** » Sun Oct 05, 2008 8:41 pm

bankroot -- we have been through all this in your other thread. Your computer would normally be quite sufficient to play and edit AVCHD. In some ways it is already more powerful than my Quad 6600. I can play AVCHD smoothly, including in X2 when it is in Clip mode. In Project mode, it jumps a little but not so badly I cannot edit it and see my edits are working the way I want them. However, you do not seem to be able to even play them smoothly in Clip mode in X2. We have not found the reason for that, but I doubt very much that upgrading to a Quad is necessarily going to change the situation -- except possibly the fact that X2 on a completely difference computer might change the situation anyway...

dalemccl · Post by **dalemccl** » Sun Oct 05, 2008 9:35 pm

I agree with what Ken said about upgrading to a quad core.

in the other thread I mentioned I have the same problem with previews and I have a Quad Core 2.83GHz. So upgrading the CPU probably won't help, at least with the jerky preview.

Bankroot, you mentioned "frozen" video in addition to the jerky video. If you mean it freezes/stops completely and doesn't go any further, then I don't get that. I just get the jerkiness. In that case, an upgrade might possibly help you, though I really doubt it.

If you mean a momentary freeze, then it jumps ahead and resumes play (until it freezes again), I do get that with my quad core. That is what I refer to as "jerky" video.

JohnDale · Post by **JohnDale** » Mon Oct 06, 2008 12:29 am

I am considering buying a new computer and the computer CPU I first considered was a core 2 duo E7300 2.6Ghz, but can go to a qaud core 2.4Ghz for an extra $85 as it doesn't look like I will be editing HD for a while is the extra $85 worth spending?. The graphics card will be a GT9800 1GB ram, would this be ok for video editing, my kids play games as well. Systen RAM 2GB . Am also considering 1 or 2 (for editing) 10000RPM WD Raptor drives would one of these drives be enough or should I still have a separate drive for editing. Or just 2 x 16M cache 7200 RPM drives?

Post by **Ken Berry** » Mon Oct 06, 2008 2:03 am

Depending on how much money you are willing to spend, I personally would spend a little more and get a better Core 2 Duo (3.0 GHz) though if not, then yes, the Core 2 Quad 6600 (I presume) does a good job -- it is what I have.

The Graphics card is fine, particularly with that 1 GB of onboard RAM. It means it won't need to borrow any from the 2 GB of system RAM -- though if I were you again, I would think about upgrading that to 3 GB anyway.

As for the Raptors, they are just not necessary for editing. Nice drives, yes, value for money -- I am not so sure.

JohnDale · Post by **JohnDale** » Mon Oct 06, 2008 2:57 am

Hi Ken
Why the 3GHz core 2 duo over the 2.4Ghz Qaud?. Arn't 4 cores better than 2 even taking into account the slower clock speed.

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Combining Upper & lower field

Combining Upper & lower field

DV field order