Shearing Problem Amongst Others!

Movick wrote on 6/9/2004, 5:09 PM
Hello,

I’m having a real heck of a time with VV5. I called tech support to address an issue I was having with resizing and replaying rendered MPEG-2 files, and after being told that my machine must have one or more internal conflicts, I decided to simply purchase a new (conflict-free) machine specifically for editing. I just installed VV5 and DVD Architect on the new machine, (nothing else thus far) and I am still having the exact same problems. Does anyone know how to address “shearing problems” in VV5? I can see this “combing effect” in the timeline in places of movement, i.e. the moving hand and towel of someone waxing a car. I see distinct separation between each frame, which looks miserable. The source footage looks fine when played back on a tv monitor from the camcorder, yet it delineates when played back in VV5 and as rendered to an MPEG-2 and played back in DVD Architect. I also notice this “shearing” issue when a still graphic flies in amid a 3D transition. This to me indicates that the source footage isn’t the culprit if a still graphic is delineating as well. Something is either inherently flawed in VV5 or there is a setting I’m missing. Can anyone help?….Please?

Thanks,

Movick

Comments

winrockpost wrote on 6/9/2004, 5:13 PM
Are you seeing this on a computer monitor or an external monitor ?
Movick wrote on 6/9/2004, 5:22 PM
I am seeing this thus far on the computer monitor.
winrockpost wrote on 6/9/2004, 5:34 PM
I would check it on an externl momitor,, may be fine. If its Interlaced you are going to have some stairstepping type stuff goin on,computer likes progresive,may look fine on your external monitor.
Also check your preview settings, make sure its on good or best.
Good luck
TheHappyFriar wrote on 6/9/2004, 5:36 PM
Could you post a link to a screenshot of the shear? I've had shear, but only from VHS sources (not SVHS, 8mm or Hi8).
Movick wrote on 6/9/2004, 7:57 PM
http://www.stevesdigital.com/shear.htm
Movick wrote on 6/9/2004, 8:05 PM
This is typical of what I'm seeing
Cheesehole wrote on 6/10/2004, 1:09 AM
Those are interlace artifacts and they are normal. That's the nature of interlaced video. Most cameras uses two slices of time to make one frame of video. Unless you are shooting progressive (Canon GL-1 or 2 for example or Panasonic ADV100) you will see that effect on your monitor, but not on a TV. I also find it miserable so I shoot progressive whenever possible.

One key rule: if your destination format is TV, then edit using a video monitor or TV. You'll then be able to preview your video without seeing the comb effect.
johnmeyer wrote on 6/10/2004, 8:08 AM
I just posted a "solution" to this problem two days ago. No one responded. Perhaps it will help you:

Solution to tearing in computer preview window
Movick wrote on 6/10/2004, 10:41 AM
Thanks for the help guys. I suspected the pixel vs. line issue might be part of the problem. I thusly went ahead and hooked the new pc to the external tv monitor through my DV camcorder. I previewed in DVD Architect through the external setup, and the interlacing seemed less evident. I still however, notice some degree of “shearing” on the external monitor when the “picture in picture” windows move about the screen (specifically at the initial point of movement). I also notice some flicker on playback – including the DVD menu thumbnails. Is this flicker indicative of what the final result will be, or is this distortion a result of the pc output through the DV camcorder?

Thanks again,

Movick
Cheesehole wrote on 6/10/2004, 12:58 PM
> I still however, notice some degree of “shearing” on the external monitor when the “picture in picture” windows move about the screen

If you are seeing the combing (I wouldn't say shearing... that's a different effect) in the content of the PIP then it is probably because when you resize the video you are destroying the original interlace relationship. As soon as you shrink the video vertically, the original interlace lines will no longer line up with the lines on your TV.

You might be able to use "Reduce Interlace Flicker" or some slight vertical blurring to tame the effect. Someone else will be able to address that better since I rarely work with interlace video (for just these reasons). Maybe changing the de-interlace method in project properties will help. Another way is to pre-deinterlace using more specialized filters in Virtual Dub. Yikes I'm all over the place. Hope it helps!
Cheesehole wrote on 6/10/2004, 1:01 PM
>I just posted a "solution" to this problem two days ago.

john, did you look at his screen shot? It looks like your garden variety interlace combing to me.
farss wrote on 6/10/2004, 2:49 PM
The top shot shows normal interlacing, ignore it.
The seconds screenshots PiP isn't normal. Using Reduce Interlace Flicker should get rid of it.