Lines in preview?

RevJonG wrote on 12/22/2005, 1:45 AM
I am hoping someone can help. I just bought a new camcorder, my first digital! Went all out (for me that is) and I love this DV thing! After yars of analog capture being able to control the camera and capture is a "miracle".

One problem:
When working on the captured DV I have vertical lines around the edges of moving objects (even those being "panned" by).

These lines are not in the video when I view it directly with WMP.

BTW I purchased a Panasonic PVGS-250... Seems great so far.

Thank you all for your help (I have been lurking for a while ;^)

RevJonG

Comments

August73 wrote on 12/22/2005, 7:34 PM
Is it only happening in the preview? I get some kind of waviness like you describe, but it only seems to happen when I'm watching the small preview window. It pretty much seems to disappear when I watch it on a larger screen. Try rendering a small loop and then watch it in full screen with WMP, see if that helps.

August
Tim L wrote on 12/22/2005, 10:01 PM
One problem:

Now when you say vertical lines, do you mean horizontal lines?

like this:
--------------------
----------------------------
----------------------
------------------------------
----------------------
----------------------------
---------------------

If so, what you are seeing is the interlaced video. All the even scan lines are photographed at one instant in time, then all the odd scan lines are photographed 1/60th of a second later (for US / NTSC). Then the even lines are photographed again another 1/60th of a second later. Every TV you have ever watched has operated this way, except for new "progressive scan" modes on newer HD TV's.

You see them when panning the camera or when the subject is in motion because the "still image" on your screen is actually a combination of two "exposures" (odd lines, even lines) taken 1/60th of a second apart.

You generally won't see these lines when the video is in motion (playing), but they are very apparent when the video is stopped (in VMS). Don't worry, everything should be fine. (Unless you really did mean vertical lines, in which case I have no idea what's going on.)

Here's a website that discusses interlacing and de-interlacing (but not related to VMS).

http://www.100fps.com/

Sorry I can't explain more, but it really is very late, and I really do need to get to bed (almost 1AM now...)

Tim L
RevJonG wrote on 12/23/2005, 2:32 AM
August,

They disappear and the rendered part looks wonderful.

Thank you for your response.
RevJongG
RevJonG wrote on 12/23/2005, 2:35 AM
Tim,

Your are correct, I meant vertical! I posted at 4am... I should have been horitzontal (in bed) so I was confused ;^)

Thank you for your post. I was concerned and considering returning the new camcorder but the rendered file looks wonderful!

RevJonG
Tim L wrote on 12/23/2005, 5:21 AM
Your are correct, I meant

LOL!

Okay, get plenty of sleep, get real rested -- I mean totally, completely rested up -- then I'll give you one more chance to try that again...

Tim L