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Old September 18th, 2003, 03:01 PM   #1
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Join Date: Jun 2003
Location: Maplewood, MN, USA
Posts: 62
Fluctuating Saturation Level


I'm trying to capture some live broadcast video to my PC. I have a Matrox RT.X100 Extreme and a Canon GL2.

I've tried a couple different methods. First, I connected my GL2 to the s-video out of my S-VHS VCR, set the channel, and recorded. After capturing the clip, I plugged the GL2 into the RT.X100 via the Firewire port.

Problem: the saturation levels fluctuated. It was particularly noticable in the skin tones.

So, I tried a different method. I plugged the S-VHS VCR directly into the break-out-box of my RT.X100 using the s-video in port, effectively removing the GL2 from the equation.

Problem: the saturation levels still fluctuated, plus the picture was dark and with a overall weak color signal. Adjusting the Proc Amps took card of that, but the saturation fluctuation was still present.

I'm thinking this is a problem with the broadcast signal, and not the RT.X100 or the GL2, but I don't see this problem when watching the show live with my TV plugged into the S-VHS VCR.

Anyone have any ideas here?

Tim Buege
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Old September 18th, 2003, 08:45 PM   #2
Join Date: May 2002
Location: Vallejo, California
Posts: 4,049
Possibly a copy protection scheme.

When I used to shove all my inbound video through my Sony SLV-R1000 S-VHS deck, the vido levels would go up and down. When I went through my Sony Home Theater amp, the level jump stopped (but of course it blocks output to the tape deck when the DVD is supplying the signal.
Mike Rehmus
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