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Diagonal Lines on Video Capture with TV Tuner

July 29th, 2009 | Posted by pftq in Blabberbox | #

  This has been bugging me for some time, but I always assumed it was just the monitor or editor program.  Basically what’s been happening is any video I capture from VHS or TV to my computer ends up with every so slight but definitely visible lines going diagonally across the screen.  I’m not sure how to explain it.  It’s not interlacing (those are horizontal and a whole other issue) and it doesn’t actually hurt the video that much like other artifacting.  You actually have to pause the video to notice them (at which you’ll see diagonal lines frozen across the image).  They’re kind of like crosshatches I guess - or honeycombs.  There really ought to be a name for it, but I can’t seem to find any references to it on Google.

  Here’s a picture of what I mean:

Diagonal lines definitely visible across the hands.

  Basic solution I’ve found so far is to keep the capture device and cables away from cables (especially power lines) if possible.  The issue was that I had the video cables crossing over a number of other cables to get to the computer (lot of cables coming out of the back of a computer - what’d you expect? :P).  Once I moved the VCR farther away and made pretty much a separate area just for the video cables to go through, the issue cleared up.

  I’m glad the issue is solved, but I kind of wish I knew exactly what it was to begin with.  A name would be nice.  Surely I’m not the first to run into this problem, so it’d be helpful to read up on it.

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