Image fluctuates through analog digital converter

I have a videonics mx-1 mixer/switcher going into my analog/digital converter. on the vhs side of the switcher and the monitors, the video is perfect. While it is on the computer, after about 20 seconds, the screen fluctuates with distortion at the top 1/4th. The image is fine on the monitors. It only happens through the converter. It starts when I switch cameras after about 20 seconds. It stops when I switch to another camera but then starts again after another 20 seconds. The image records that way. We use to record our productions vhs but we now use the imovie and idvd. I need to stop the fluctuations. It seems to be in the switcher but it doesn't fluctuate on the monitors. Only fluctuates through the converter. But when I switch it stops. I know, I said that. I don't want to buy a switcher if my switcher works well. Not sure if it the converter either. I tried the RCA and the video jacks. Either way I get the same conclusion. Can anyone help? My converter and computer are new. The switcher is from 1994.
imac   Mac OS X (10.4.7)   imovie HD

Hi Alan
Scart are a bit tricky.
If You got a SCART/RCA plug with three RCA connector on it's back ONLY.
My bet is that You have one video in TO YOUR VCR not the way back (and
that You got it with Your Camera ?? at least I did so).
You need a SCART plug with a Switch on it marked IN/OUT.
and then it is the VCR - mine has two SCART "ports" only one of them has
the ability to communicate both ways.
The Canopus ADVC 55 is a one way device. From VCR to Mac - not the other
way.
And finishing:
You or Your Mac can't remote control the VCR. You need to press play on it
or on it's remote to start to deliver to the Canopus and to iMovie.
Hopfully this gave some useful ideas. Self using Canopus ADVC 300 and
very happy with this one.
Yours Bengt W

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