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Old May 27th, 2004, 09:32 PM   #1
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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?
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Old May 27th, 2004, 10:07 PM   #2
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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.
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Old May 27th, 2004, 10:51 PM   #3
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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.
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Old May 28th, 2004, 07:30 AM   #4
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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
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Old May 28th, 2004, 02:20 PM   #5
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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.
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Old May 28th, 2004, 07:26 PM   #6
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Stay on topic and avoid personal attacks, please.
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