fringing lines

massmedia wrote on 1/5/2005, 6:48 PM
Can someone help me find the problem source? a captured video when it is played back, a fringing lines in the side of the object appear everytime the object move faster(on the movie editing window). example when someone wave the hand you can't see the hand it has some lines and the clarity of the object is gone.

It also show line in the screen at the begining of the video. Your knowlege in this matter is highly appreciate. Thank you

JR

Comments

Spot|DSE wrote on 1/6/2005, 12:55 AM
It sounds as though you are describing interlacing, which is normal. When you watch interlaced footage on a computer monitor, which is a progressive scan format, you'll see this sort of artifacting. This will not show up on a television monitor.
massmedia wrote on 1/8/2005, 5:25 AM
sound very helpful. Can you help identify the posible reason why this appears in the computer monitor? Is it because of memory? I have 512 in my computer. Or is it the video card? I'm using 8X AGP 128 MB G-force card. What do you think is the possible cause?

Thank you so much for your assistance.

JR
SonicClang wrote on 1/8/2005, 5:28 AM
Will selecting "Reduce Interlace flicker" help this problem?
Chienworks wrote on 1/8/2005, 5:53 AM
The reason it shows up on your computer monitor is because the computer monitor displays progressive scan images and the footage you are working with is interlaced. The solution is to shoot progressive footage to begin with. Changing the video card won't make any difference, unless you can find an interlaced video card and monitor ... which happens to be ... your television!
farss wrote on 1/8/2005, 6:02 AM
The majority of video is interlaced, in fact even if you shoot progressive it is still two interlaced fields, no tape system or camera actually records a full frame. It's just that when you shoot progressive one full frame is captured at the one instant in time and that is split into two fields although if it's 24p it's a bit more complex than that.
Now computer monitors can only display a progressive image so for anthing shot interlaced you will get interlace artifacts (combing) on anything that moves. This is normal and you will not see this on a TV. If your target is display on a computer monitor then you should probably shoot with a true progressive camera or de-interlace using Vegas.

If you want to see your video as it'll look on a TV then you need a video not computer monitor and some form of firewire to analogue video converter. If you can't afford a video monitor then even a TV can be pressed into service, not ideal but better than the PC monitor.
Bob.
BillyBoy wrote on 1/8/2005, 6:02 AM
I posted this in another thread yesterday.

http://arstechnica.com/guides/tweaks/vidcap.ars/1

It shows the effect of interlacing and goes into a lot of details on the why it happens and what you can to do about it.

massmedia wrote on 1/10/2005, 6:51 PM
Thanks bob I'm on the process of developing my setup.

JR
rs170a wrote on 1/10/2005, 7:05 PM
http://www.100fps.com/ is another excellent site that discusses interlacing/deinterlacing issues.

Mike