Horizontal lines on all moving objects. Help! at DVinfo.net

Kyle Field · May 27th, 2004, 08:32 PM

Here's my dilema. I bought a Sony TRV80 and filmed my dogs catching their frisbees. Captured it to my Pentium 4 and discovered everything that was moving was jagged and made up of "horizontal lines". This only occurred on moving objects. So I sold the camera. I am new to this stuff, so I suspected the camera.

I now have a Canon GL2 and the same problem appears. So I figured it was my editing software, but after capturing with ArcSoft's Showbiz, Sonic's MyDVD and Adobe Premier Pro, they ALL exhibit this problem. Needless to say, I'm not happy about this.

My computer is a P4 1.7GHz with 1Gb of memory and an ATI Rage All-in-Wonder Raedon graphics card, captured via a 1394 port down on the board (not a PCI card). If I play the video back directly from the camera to the TV, the problem does not appear. Capturing as .avi, .mpeg, .wmv, ... whatever does not make a difference.

Can anyone tell me how to NOT get this problem with moving objects? Is it my graphics card?

Kent Diamond · May 27th, 2004, 09:07 PM

This is an artifact of video interlacing. When TVs were first invented they were not fast enough to repaint the whole screen. To save processing power and video bandwidth, NTSC repaints the old number lines on one pass and the even number lines on the next pass. Each pass is a 60th of a second. You get a full frame every 30th of a second (OK, every 29.97th of a second, but that's another story). The artifact come from the object moving in the 60th of a second between half frames.

Very annoying to look it on a computer screen at first. But when you go out to video or DVD you don't notice it.

Read up in your manuals about interlacing and NTSC and fields to learn more.

Steve Roffler · May 27th, 2004, 09:51 PM

Kyle,

I had the same problem with my pdx10 outputing to Vegas 4.

The problem was with interlacing. The solution was to render in progressive mode. The lines disappeared.

Bram Corstjens · May 28th, 2004, 06:30 AM

If you'd post this message BEFORE you sold your 'broken' cam we've could all have told you there's nothing wrong with it!

Needless to say there's nothing wrong with your graphics card either.

Well, at least someone now has a very cheap 'broken' cam :P

Kyle Field · May 28th, 2004, 01:20 PM

In my message I said I was new to video editing, so my first thought was that the camera's quality was poor and perhaps the shutter speed was not suited for fast action footage. I never said it was broken. Besides, I also wanted a 3CCD camera, so it was a good enough reason for me to sell it to get the GL2.

Jeff Donald · May 28th, 2004, 06:26 PM

Stay on topic and avoid personal attacks, please.

May 27th, 2004, 08:32 PM	#1
Kyle Field New Boot Join Date: May 2004 Location: houston Posts: 16	Horizontal lines on all moving objects. Help! Here's my dilema. I bought a Sony TRV80 and filmed my dogs catching their frisbees. Captured it to my Pentium 4 and discovered everything that was moving was jagged and made up of "horizontal lines". This only occurred on moving objects. So I sold the camera. I am new to this stuff, so I suspected the camera. I now have a Canon GL2 and the same problem appears. So I figured it was my editing software, but after capturing with ArcSoft's Showbiz, Sonic's MyDVD and Adobe Premier Pro, they ALL exhibit this problem. Needless to say, I'm not happy about this. My computer is a P4 1.7GHz with 1Gb of memory and an ATI Rage All-in-Wonder Raedon graphics card, captured via a 1394 port down on the board (not a PCI card). If I play the video back directly from the camera to the TV, the problem does not appear. Capturing as .avi, .mpeg, .wmv, ... whatever does not make a difference. Can anyone tell me how to NOT get this problem with moving objects? Is it my graphics card?

May 27th, 2004, 09:51 PM	#3
Steve Roffler Regular Crew Join Date: Feb 2004 Location: Taipei, Taiwan Posts: 100	Kyle, I had the same problem with my pdx10 outputing to Vegas 4. The problem was with interlacing. The solution was to render in progressive mode. The lines disappeared. __________________ Steve pdx10, EOS10D

May 28th, 2004, 06:26 PM	#6
Jeff Donald Warden Join Date: Mar 2002 Location: Clearwater, FL Posts: 8,287	Stay on topic and avoid personal attacks, please. __________________ Jeff Donald Carpe Diem Search DVinfo.net for quick answers \| Where to Buy? From the best in the business: DVinfo.net sponsors

May 27th, 2004, 09:07 PM	#2
Kent Diamond New Boot Join Date: Jan 2004 Location: Redmond, Washington Posts: 24	This is an artifact of video interlacing. When TVs were first invented they were not fast enough to repaint the whole screen. To save processing power and video bandwidth, NTSC repaints the old number lines on one pass and the even number lines on the next pass. Each pass is a 60th of a second. You get a full frame every 30th of a second (OK, every 29.97th of a second, but that's another story). The artifact come from the object moving in the 60th of a second between half frames. Very annoying to look it on a computer screen at first. But when you go out to video or DVD you don't notice it. Read up in your manuals about interlacing and NTSC and fields to learn more.

May 28th, 2004, 06:30 AM	#4
Bram Corstjens Regular Crew Join Date: Mar 2003 Location: Netherlands Posts: 126	If you'd post this message BEFORE you sold your 'broken' cam we've could all have told you there's nothing wrong with it! Needless to say there's nothing wrong with your graphics card either. Well, at least someone now has a very cheap 'broken' cam :P

May 28th, 2004, 01:20 PM	#5
Kyle Field New Boot Join Date: May 2004 Location: houston Posts: 16	In my message I said I was new to video editing, so my first thought was that the camera's quality was poor and perhaps the shutter speed was not suited for fast action footage. I never said it was broken. Besides, I also wanted a 3CCD camera, so it was a good enough reason for me to sell it to get the GL2.